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Superhydrophobic route of fabricating antireflective, self-cleaning, and durable coatings for solar cell applications / Anne Sathya in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 1-30 Titre : Superhydrophobic route of fabricating antireflective, self-cleaning, and durable coatings for solar cell applications Type de document : texte imprimé Auteurs : Anne Sathya, Auteur ; Caroline Ponraj, Auteur Année de publication : 2024 Article en page(s) : p. 1-30 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Dépôt par pulvérisation Dip-coating Hydrophobie Photopiles Revêtement antireflet Revêtement auto-nettoyant Revêtement par centrifugation Silice La silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux. La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...). Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale. Index. décimale : 667.9 Revêtements et enduits Résumé : The multifaceted applications of superhydrophobic surfaces arising out of their unique surface architecture have gained significant attention in the solar photovoltaic industry as it addresses the challenges in light conversion efficiency at an industrial scale due to the soiling of surfaces. Inspired by the self-cleaning properties of the lotus leaf, this review proposes the use of superhydrophobic surfaces as an effective solution for soiling mitigation in solar cell applications. The review examines various factors influencing dust settlement and evaluates existing soiling mitigation techniques. As most literature reports the insufficiency of theoretical wetting models with the controversies around its assumptions, the importance of modified models over the theoretical models is compared and highlighted. The foundations of superhydrophobic coatings including transmittance, porosity, and refractive index of coatings, thickness and surface roughness in addition to the commonly reported surface tension and surface free energy aid to focus on feasible fabrication techniques and provide improved efficiency of solar cells. Finally, the review presents a classification of durability tests to highlight the importance of durable coatings bridging the gap between the fabrication and application of superhydrophobic coatings for solar cells on an industrial scale. Note de contenu : - Factors influencing dust settlement - Soiling mitigation methods - Superhydrophobic route of soiling mitigation: an efficient approach - Foundation of superhydrophobic solar panels - Theoretical wetting models - Modified models - Various fabrication methods for coating solar panels - Durability of superhydrophobic coatings - Table 1 : Various surface energy reducing agents for superhydrophobicity - Table 2 : Advantages and disadvantages of various fabrication methods for superhydrophobic coatings - Table 3 : Various fabrication techniques and properties for coating solar panels DOI : https://doi.org/10.1007/s11998-023-00843-x En ligne : https://drive.google.com/file/d/1TykpYC0J89qhe7yU4NmEXxeTz42v9p-n/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40434 [article]

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Toward a new generation of fertilizers with the approach of controlled-release fertilizers: a review / Samira Moradi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 31-54 Titre : Toward a new generation of fertilizers with the approach of controlled-release fertilizers: a review Type de document : texte imprimé Auteurs : Samira Moradi, Auteur ; Aziz Babapoor, Auteur ; Samaneh Ghanbarlou, Auteur ; Masoomeh Yari Kalashgarani, Auteur ; Iman Salahshoori, Auteur ; Ahmad Seyfaee, Auteur Année de publication : 2024 Article en page(s) : p. 31-54 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agriculture Azote Engrais organiques Système de libération contrôlée (technologie) Index. décimale : 667.9 Revêtements et enduits Résumé : Coping with the growth of the global population and the necessity for food, the agricultural sector has been compelled to rely heavily on fertilizers as a means to enhance both the quantity and quality of agricultural products. The drastic depletion of these fertilizers (30-50%) poses a serious risk to both human safety and the environment. Researchers have introduced new-generation fertilizers (NGFs) to tackle these challenges. This study initially examined the pros and cons, nitrogen loss, and global usage of traditional fertilizers. Subsequently, it categorized different types of NGFs, with a particular focus on the utilization of controlled-release fertilizers (CRFs). Afterward, the research delved into studying the nutrient release mechanism, the type of coating materials, the techniques employed for coating, the advantages and challenges related to CRFs, and the impact of specific parameters on the mechanism of CRFs. In conclusion, we have presented a comprehensive overview of several commercially manufactured variants of CRFs. The utilization of CRFs is experiencing a notable upward trend, exhibiting a compound annual growth rate (CAGR) of 6.37%. Moreover, this growth includes active involvement from governments, farmers, and industries. Note de contenu : - Fertilizers - Nitrogen loss and the environment - Global consumption of fertilizer - New-generation fertilizers - Mechanism of controlled release of nutrients from CRFs - Classification of materials for CRFs productions - Techniques of coating application - Methods for determining nutrient release rate - The effective parameters of the release rate - Advantages of CRFs - Technical challenges - Commercial production of CRFs - Table 1 : Advantages and disadvantages of organic/inorganic fertilizers - Table 2 : World P, N, and K supply, demand balance, and CAGR 2020 (thousand tons) - Table 3 : Advantages and disadvantages of sulfur coating - Table 4 : Advantages and disadvantages of polymer coating - Table 5 : Types of coating materials for CRFs productions - Table 6 : Some materials and methods used for CRFs production - Table 7 : Determination of nutrient release rate methods - Table 8 : The effect of some parameters on the nutrient release rate - Table 9 : Some of the CRFs produced on a commercial scale DOI : https://doi.org/10.1007/s11998-023-00817-z En ligne : https://drive.google.com/file/d/1fcQY77R6vAHLGaoxmGtDkpiHKoWCo85e/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40435 [article]

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A review of polymer-matrix piezoelectric composite coatings for energy harvesting and smart sensors / Kabir Baidya in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 55-85 Titre : A review of polymer-matrix piezoelectric composite coatings for energy harvesting and smart sensors Type de document : texte imprimé Auteurs : Kabir Baidya, Auteur ; Amritendu Roy, Auteur ; Kaushik Das, Auteur Année de publication : 2024 Article en page(s) : p. 55-85 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Capteurs (technologie) Energie -- Récupération Formulation (Génie chimique) Matériaux intelligents Matériaux piézoélectriques Polymères Revêtements organiques Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : Piezoelectric paints/coatings usually consist of a polymeric matrix (binder) with embedded piezoelectric ceramics (second phase or pigment) in the form of microparticles or nanoparticles. Piezoelectric paints have gained prominence in aerospace applications among the various categories of smart coatings, especially for structural health monitoring and absorbing radiation. These coatings (in the form of thin/thick films) are also being applied in the place of brittle piezo-ceramics in various microelectronic devices, for example, in gas sensors and flexible electronics, as well as in various energy-harvesting applications. This review paper focuses on the current state of research for the processing and characterization of piezoelectric composites used as paints/coatings films. Special emphasis is on: (i) the processes of application of piezoelectric paints/coatings in the form of a single layer or stacks of thick films and (ii) the processes of poling these piezoelectric coatings. Various modes and process parameters of poling and their effects on the piezoelectric output of different piezoelectric composites are discussed with examples from the literature. Finally, we have tried to identify the existing issues and address the possible way forward in terms of industrial or academic research within the domain of piezoelectric paint/coating film. Note de contenu : - Fundamentals of piezoelectricity, piezoelectric materials and their properties - Piezoelectric smart composite coating - Process of application of piezoelectric composite coating - Poling of piezoelectric materials - Performance of piezoelectric composite coating/paints - Summary, existing issues and the way forward - Table 1 : Piezoelectric and electromechanical properties of piezo-ceramics and piezopolymers - Table 2 : Formulation of piezoelectric paint based on KNN and alkyd resin - Table 3 : Ingredients, composition, casting and thickness for various fabricated coating films - Table 4 : Poling type, electrode and poling condition for various fabricated composite coating films - Table 5 : Composite coatings composition and piezoelectric output DOI : https://doi.org/10.1007/s11998-023-00819-x En ligne : https://drive.google.com/file/d/1x00TGDigUu8cmt8rbJxd-WL2l8q6Euim/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40436 [article]

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Quaternary ammonium antimicrobial agents and their application in antifouling coatings : a review / Shuting Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 87-103 Titre : Quaternary ammonium antimicrobial agents and their application in antifouling coatings : a review Type de document : texte imprimé Auteurs : Shuting Wang, Auteur ; Biwei Qiu, Auteur ; Jiangao Shi, Auteur ; Meng Wang, Auteur Année de publication : 2024 Article en page(s) : p. 87-103 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Ammoniums quaternaires Antimicrobiens Composés inorganiques Copolymères greffés Polydiméthylsiloxane Le polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones. Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone. Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK). La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones. Polyuréthanes Revêtements antisalissures:Peinture antisalissures Index. décimale : 667.9 Revêtements et enduits Résumé : The construction of coatings on the surface of materials to avoid contamination is a common means of antifouling that has been extensively and systematically studied. Currently, adding biocide components to the coating to kill bacteria and other adherent microorganisms on the material's surface is the most effective way. However, the loss of effective bactericidal components can cause the coating to lose its long-lasting antimicrobial performance. To solve this problem, the use of organic polymeric antimicrobial agent quaternary ammonium salts came into being. The quaternary ammonium salt component can be chemically bonded to the polymer matrix in the coating, effectively avoiding the loss of the active ingredient. Quaternary ammonium salts mainly achieve bactericidal purposes through interaction with cell membranes, and their antimicrobial activity is closely related to the molecular structure. This article mainly summarizes the relevant research progress of quaternary ammonium salt compounds and divides their application in antifouling coatings into two major categories: quaternary ammonium salt grafted polymer matrix and quaternary ammonium salt compounded with inorganic particles through different doping methods of quaternary ammonium salt in antifouling coatings, summarizing the relevant research in recent years. Note de contenu : - RESEARCH PROGRESS OF QUATERNARY AMMONIUM ANTIMICROBIAL AGENTS : Classification of quaternary ammonium antimicrobial agents - Antibacterial mechanism of quaternary ammonium salt antimicrobial agent - Constitutive relationship of quaternary ammonium antimicrobial agents SUMMARY OF RESEARCH ON ANTIFOULING ON COATINGS WITH QUATERNARY AMMONIUM SALTS : Quaternary ammonium salt-grafted polymers - Quaternary ammonium salt compounded with inorganic particles - Table 1 : Structure of polymer matrix grafted quaternary ammonium salts DOI : https://doi.org/10.1007/s11998-023-00825-z En ligne : https://drive.google.com/file/d/19gtpLuxj4lwnyaj4Jb1WNI126-afVbzm/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40437 [article]

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Chromate (Cr6+)-free surface treatments for active corrosion protection of aluminum alloys: a review / Shri Shri Prakash in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 105-135 Titre : Chromate (Cr6+)-free surface treatments for active corrosion protection of aluminum alloys: a review Type de document : texte imprimé Auteurs : Shri Shri Prakash, Auteur ; J. N. Balaraju, Auteur Année de publication : 2024 Article en page(s) : p. 105-135 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium -- Alliages Anticorrosifs Anticorrosion Chrome hexavalent Métaux -- Oxydation anodique Métaux -- Revêtements protecteurs Revêtement de conversion Sol-gel, Procédé Index. décimale : 667.9 Revêtements et enduits Résumé : For many decades, chromium and its derivatives have been the integral part in the corrosion protection of structural parts and have a wide application in the aircraft industry. It is used in the pre-treatment of aluminum substrate in the form of anodization or conversion coating and in the primer layer as a chromate additive. However, harmful impact of hexavalent chromium (Cr6+) compounds on the human health and the environment has triggered the need to find alternative corrosion protection measures. Finding an alternative to chromate is an arduous effort as chromates are known to provide a corrosion protection under extreme environmental conditions over a very wide range of pH. Active corrosion protection ability, commonly known as self-healing ability, is a hallmark of chromates. In a pursuit to realize an eco-friendly coating system, there are efforts worldwide to find alternatives both for primer component and for the pre-treatment process. This review focuses on work that has been carried out to replace Cr6+ in the pre-treatment process. Importance is given to those alternative pre-treatment processes that have the potential to provide active corrosion protection and possibly replace chromic acid-based anodization and conversion coatings. Note de contenu : - Introduction - Eco-friendly alternatives with active corrosion protection - Transition metal ions - Cerium-based solutions - Table 1 : Summary of the coating development and corrosion performance of the coatings with Cr3+-based sealing formulation - Table 2 : Summary of the coating development and corrosion performance of the coatings with transition metal ions added to anodizing bath - Table 3 : Summary of the coating development and corrosion performance of the coatings with transition metals added as a corrosion inhibitor to the sealing bath - Table 4 : Summary of the coating development and corrosion performance of the anodic coating with cerium as a corrosion inhibitor added to the sealing bath - Table 5 : Summary of the coating development and corrosion performance of the hybrid sol-gel coatings DOI : https://doi.org/10.1007/s11998-023-00831-1 En ligne : https://drive.google.com/file/d/1zoy-3zC6Ro32of8jMsyuV9AV3spMzcVq/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40438 [article]

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Emerging research trends in the field of polyurethane and its nanocomposites : Chemistry, Synthesis, Characterization, Application in coatings and Future perspectives / Swati Jakhmola in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 137-172 Titre : Emerging research trends in the field of polyurethane and its nanocomposites : Chemistry, Synthesis, Characterization, Application in coatings and Future perspectives Type de document : texte imprimé Auteurs : Swati Jakhmola, Auteur ; Sonalee Das, Auteur ; Kingshuk Dutta, Auteur Année de publication : 2024 Article en page(s) : p. 137-172 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Charges (matériaux) Matériaux autoréparants Matériaux hybrides Nanoparticules Polyuréthanes Recyclabilité Résistance aux conditions climatiques Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Polyurethane (PU) coatings are widely used in various industries due to their excellent mechanical strength, along with abrasion, chemical and weather resistance. Recently, use of dynamic bonds to increase the recyclability and self-healing properties of PU is being extensively explored. Incorporation of nanofillers into the PU matrix can further enhance their performance as a coating matrix for application demanding thermal stability, mechanical strength, abrasion resistance, corrosion resistance, foul resistance, smudge resistance and UV resistance. It has been reported that inclusion of nanofillers, like nano-silica, graphene, organoclay, zinc oxide and titanium dioxide can provide enhanced functionalities to the PU matrix owing to their small size and high surface area-to-volume ratio to design tailor made PU coatings with desired properties. This review highlights the classification of PUs based on different dynamic chemistry for imparting self-healing and recyclability properties to the polymer matrix. Further, it will also provide a detailed insight regarding various polyol sources used for the synthesis of PUs, technologies adopted to incorporate nanofillers into the PU matrix for developing PU nanocomposite for coating applications and properties associated with these coatings. A brief conclusion highlighting the present challenges and future prospects of the PU nanocomposite coatings is also presented. Note de contenu : - Polyurethane based on dynamic chemical bonds - Development of polyurethane coatings from different bio-based sources - Development of polyurethane coatings with different nanofillers - Nano-silica - Applications of polyurethane nanocomposites in coating technology - Present challenges and prospect cts DOI : https://doi.org/10.1007/s11998-023-00841-z En ligne : https://drive.google.com/file/d/10yMX2E6U4MclPIoCpujOokEx3pvNB8nw/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40439 [article]

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A review on microencapsulated phase change materials in building materials / Soham Sharad Chaudhari in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 179-198 Titre : A review on microencapsulated phase change materials in building materials Type de document : texte imprimé Auteurs : Soham Sharad Chaudhari, Auteur ; Niraj Govinda Patil, Auteur ; Prakash A. Mahanwar, Auteur Année de publication : 2024 Article en page(s) : p. 179-198 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alcanes Caractérisation Construction -- Matériaux Encapsulation Enrobage (technologie) Eutectiques Un eutectique est un mélange de deux corps purs qui fond et se solidifie à température constante, contrairement aux mélanges habituels. Il se comporte en fait comme un corps pur du point de vue de la fusion. C'est aussi le point du diagramme (mélange avec une proportion donnée) pour lequel le mélange est à sa température minimale en phase liquide. Cette température est propre à chaque mélange. Lisier Matériaux cimentaires -- Propriétés thermiques Mortier Polymères Thermocinétique Transition de phase En physique, une transition de phase est une transformation du système étudié provoquée par la variation d'un paramètre extérieur particulier (température, champ magnétique...). Cette transition a lieu lorsque le paramètre atteint une valeur seuil (plancher ou plafond selon le sens de variation). La transformation est un changement des propriétés du système. Index. décimale : 667.9 Revêtements et enduits Résumé : Energy is one of the most critical factors in modern life and its consumption is increasing. Fossil fuels, the main energy sources, are being depleted due to heavy demand, which also contributes to the rising atmospheric temperature, harming both nature and human health. To overcome the energy crisis, improving the energy efficiency of existing technologies is crucial. Phase change materials (PCMs) are promising materials that improve energy efficiency through thermoregulation. By storing thermal energy within a narrow temperature range, PCMs reduce temperature fluctuations, minimizing the energy required to maintain a constant temperature. Buildings consume a large amount of energy for thermoregulation, and the incorporation of microencapsulated PCMs (MPCMs) into building materials can play a crucial role in regulating temperature. This review paper acquaints the reader with PCMs, their types and PCM microencapsulation techniques, which are essential for formulating coatings in the paint industry and other building materials. Note de contenu : - PHASE CHANGE MATERIAL : Organic PCM - Eutectic PCM - ENHANCEMENT OF THERMAL CONDUCTIVITY OF PCM : Addition of substancecs with high thermal conductivity - SHELL TYPES AND MATERIALS : Organic shells - Inorganic shells - Organic-inorganic hybrid shell - ENHANCEMENT OF THERMAL CONDUCTIVITY OF RESINS : Epoxy resins - Acrylic resin - Polyurethane resins - Melamine-formaldehyde resin - Polydivinylbenzene resin - MICROENCAPSULATION OF PHASE CHANGE MATERIALS : Physical methods - Chemical methods - Physical-chemical method - CHARACTERIZATION TECHNIQUES FOR MPCM : Applications - Application in paint - Concerete - Bricks and mortars - Wallboards - SUGGESTIONS FOR FUTURE WORK IN MICROENCAPSULATED PHASE CHANGE MATERIAL - Table 1 : Thermophysical properties of paraffin - Table 2 : Thermophysical properties of non-paraffins - Table 3 : Thermophysical properties of salt hydrates - Table 4 : Properties of eutectic mixtures - Table 5 : Advantages and disadvantages of different PCMs - Table 6 : Shell material, core material and synthesis methods - Table 7 : Characterization methods DOI : https://doi.org/10.1007/s11998-023-00814-2 En ligne : https://drive.google.com/file/d/1dGp4ZWTGSLVHr8Ra4UkrCaMqTtnd2n8W/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40440 [article]

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Effect of zinc oxide and zinc oxide nanoparticles coating on urea diffusion and its release kinetics for design and development of slow-release fertilizer: an experimental and numerical investigation / Bilal Beig in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 199-213 Titre : Effect of zinc oxide and zinc oxide nanoparticles coating on urea diffusion and its release kinetics for design and development of slow-release fertilizer: an experimental and numerical investigation Type de document : texte imprimé Auteurs : Bilal Beig, Auteur ; Muhammad Bilal Khan Niazi, Auteur ; Baseer Ullah, Auteur ; Ahmed Nadeem Gondal, Auteur ; Zaib Jahan, Auteur ; Munir Zia, Auteur ; Ahmad Nouman, Auteur Année de publication : 2024 Article en page(s) : p. 199-213 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Eléments finis, Méthode des Engrais Nanoparticules Nutriments Oxyde de zinc Système de libération contrôlée (technologie) Urée Index. décimale : 667.9 Revêtements et enduits Résumé : Urea is the most applied nitrogenous fertilizer with 46% nitrogen (N) among available synthetic fertilizers. On the other hand, uncoated urea is subjected toward quick nutrient loss due to its higher solubility. This problematic issue could be addressed by applying slow-release fertilizer. The main aim behind this research was to model and simulate the nutrient release pattern from coated urea using zinc oxide (ZnO) as a micronutrient Zn source. A multidiffusional model was adopted for the simulation of prill fertilizer. During this study, finite element method and 2D geometry were utilized for prilled urea fertilizer using COMSOL multiphysics software. The second phase consisted of release kinetic study by using the experimental release data. In the present research, synergism was observed between the simulation and experimental results of nutrient release, with an error of 0.041. The dissolution curves of urea for simulation and experimental studies followed sigmoidal behavior. The results findings indicated that a second-order equation could be used to express the nutrient release from Zn coatings (ZnO or ZnO-NPs). Second-order kinetics express that nutrient release from Zn-coated urea was controlled by diffusion. Additionally, the second-order kinetic constant increases with raise in coating percentages which enhanced the mass transfer resistance. Note de contenu : - MATERIALS AND METHODS : Reagents - Synthesis of ZnO-NPs - Synthesis of SRF - Characterization of SRF - RESULTS AND DISCUSSION : Model validation with the experimental results - Slow release of urea in soil–water system - Nutrient release from ZnO-coated urea (2D) - Table 1 : Different kinetic models for nutrient release from slow-release fertilizer DOI : https://doi.org/10.1007/s11998-023-00810-6 En ligne : https://drive.google.com/file/d/1WGpF35ClyYMHn8WIPGPHeGEWc1muzMZq/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40441 [article]

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Enhanced wear resistance of epoxy coatings on steel using graphene oxide / Amanda B. Filizzola in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 215-228 Titre : Enhanced wear resistance of epoxy coatings on steel using graphene oxide Type de document : texte imprimé Auteurs : Amanda B. Filizzola, Auteur ; Joao L. N. Pereira, Auteur ; Pollyanna R. dos Santos, Auteur ; Felipe da S. Medeiros, Auteur ; Sthéfany Z. S. do Amparo, Auteur ; Claudia K. B. de Vasconcelos, Auteur ; Glaura G. Silva, Auteur Année de publication : 2024 Article en page(s) : p. 215-228 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Abrasion Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique. L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1. C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple. Epoxydes Flexion (mécanique) Métaux -- Revêtements Mouillabilité Oxyde de graphène Résistance à l'usure Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Graphene oxide (GO) addition to epoxy can improve various properties provided that the GO features, dispersion and interaction with epoxy are optimized. Herein, the challenge of improving the hydrophobicity, flexural behavior and wear resistance of an epoxy coating on steel substrate was addressed by GO incorporation. Three GO concentrations were tested in the epoxy system (0.1, 0.25, and 0.50% m/m), and nanocomposites were prepared via roller mill. An increase in the thermal stability of the pure epoxy by 23°C was observed for the nanocomposites as a function of GO incorporation. XPS analyses were carried out to study the interaction between DGEBA and GO, and the results show that a covalent link was formed between GO and epoxy. The wettability test showed an increase of 26° in the contact angle while the behavior of the system from mechanical bending tests showed gains of 52% in the energy to fracture for the sample containing 0.5 wt.% GO with respect to the neat epoxy. The wear of the coatings showed a 31% decrease in the wear coefficient of the nanocomposite compared to the reference. The set of results reported in the present work pointed to the epoxy/GO coating as promising in terms of hydrophobicity and wear properties. Note de contenu : - Chemicals and reagents - Synthesis of GO - Nanocomposite coating preparation and application on the substrate - Characterization - Table 1 : Chemical composition (wt.%) of the steel substrate - Table 2 : Elementary analysis for the GO sample - Table 3 : Glass transition temperature and percentage of cure of the samples under study obtained by DSC in triplicate - Table 4 :- Binding energy and percentage of the components from C1s, O1s and N1s XPS spectra for epoxy and epoxy-GO samples DOI : https://doi.org/10.1007/s11998-023-00811-5 En ligne : https://drive.google.com/file/d/1mChElztnOwMgBPz0JSjniPQ_xRRrimnN/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40442 [article]

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Maleinized hyperbranched alkyd resins : structural, thermal, rheological and film properties / Jessica Duarte in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 229-242 Titre : Maleinized hyperbranched alkyd resins : structural, thermal, rheological and film properties Type de document : texte imprimé Auteurs : Jessica Duarte, Auteur ; Sindy Morales, Auteur ; Edwin A. Murillo, Auteur Année de publication : 2024 Article en page(s) : p. 229-242 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique Anhydride maléique Chimie analytique Copolymères greffés Couches minces Polyalkydes Polymères -- Synthèse Polymères ramifiés Index. décimale : 667.9 Revêtements et enduits Résumé : In this work a hyperbranched alkyd resin (HBAR) was synthesized from a hyperbranched polyester polyol of fourth-generation (HBP4) and tall oil fatty acids. Furthermore, the HBAR was modified with several proportions (10, 20, 30, and 40 wt%) of maleic anhydride (MA) to obtain maleinized HBAR (HBARMAs). The structural, thermal, rheological, and film properties of the HBAR and HBARMAs were evaluated for the purpose of estimating the effect of MA content on the properties of the HBARMAs. HBARMAs exhibited hydroxyl values inferior to that of the HBAR and it decreased with the MA content. Infrared and proton nuclear magnetic resonance (1H NMR) analyses provided evidence of the formation of the HBAR and HBARMA. The number average molar mass () of the HBP4 was lower than that of the HBAR, but those of the HBARMAs were higher. Using dynamic light scattering analysis, it was observed that HBAR exhibited smaller hydrodynamic dimensions than HBARMAs. The glass transition temperature (Tg), onset decomposition temperature (Tonset), and viscosity (η) values of the HBARMAs increased with the MA content and it was higher than those of the HBAR. However, the drying time exhibited the opposite behavior. Note de contenu : - MATERIALS AND METHODS : Synthesis of HBAR - Synthesis of the HBARMAs - Characterizations of the materials - RESULTS AND DISCUSSION : AV, conversion percentage (CP), GD, and grafting efficiency (GE) - OHV, modification percentage (MP), number of OH groups that reacted (K) and unreacted (H) - IR analysis - 1 H NMR analysis - VPO analysis - DLS analysis - Thermal analysis - Rheological analysis - Film properties - Table 1 : AV, CP, GD, and EG of the HBAR and HBARMA samples - Table 2 : OHV, MP, K, and H of the HBAR and HBARMA samples - Table 3 : Results of VPO and d1 and d2 values of the HBAR and HBARMAs - Table 4 : Tg, Tonset, Tonset of the RAAR and RAARAM samples - Table 5 : Chemical resistance of the HBAR and HBARMA samples - Table 6 : Results of flexibility, adhesion, gloss, drying time, and hardness of the HBAR and HBARMA samples DOI : https://doi.org/10.1007/s11998-023-00833-z En ligne : https://drive.google.com/file/d/1kV_KRlhXBtJ9xHEWJap62xoMUGd1njDC/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40443 [article]

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Phosphorylated PVA coatings for corrosion protection of Mg AZ31 alloy / Carlos Henrique Michelin Beraldo in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 243-253 Titre : Phosphorylated PVA coatings for corrosion protection of Mg AZ31 alloy Type de document : texte imprimé Auteurs : Carlos Henrique Michelin Beraldo, Auteur ; Almir Spinelli, Auteur ; Nico Scharnagl, Auteur ; Thiago Ferreira da Conceição, Auteur Année de publication : 2024 Article en page(s) : p. 243-253 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Caractérisation Magnésium -- Alliages Métaux -- Revêtements protecteurs Phosphorylation La phosphorylation est l'addition d'un groupe phosphate (un phosphoryl PO32- plus précisément) qui est transféré à une protéine ou à une petite molécule, telle le glucose ou l'adénine. Polyacétate de vinyle Polyacétate de vinyle phosphorylé Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : In this paper, the influence of different amounts of phosphoric acid on the protective properties of phosphorylated PVA (PPVA) coatings on a Mg AZ31 alloy is investigated. PPVA coatings and free-standing films were prepared by dip-coating and casting, respectively, and characterized by scanning electron microscopy, Fourier transform infrared spectroscopy and swelling assays. The anticorrosion properties of the coatings were investigated by electrochemical impedance spectroscopy and potentiodynamic polarization, both in 3.5 wt% NaCl solution. The results show that |Z| values increase with the amount of H3PO4, reaching values on the order of 105 Ω cm2 for the coating with the highest amount of H3PO4 (0.100 PPVA). Additionally, this sample shows the lowest swelling degree (around 80%). Polarization tests demonstrate that all coatings significantly decrease jcorr (from 4.8 μA cm−2 to values around 0.3 μA cm−2) by means of a cathodic inhibition. These results make of PPVA coatings interesting water-based alternatives to polysaccharide coatings. Note de contenu : - MATERIALS AND METHODS : Materials - Free-standing films preparation and characterization - Coatings preparation and characterization - RESULTS AND DISCUSSION : Free-standing films characterization - Coatings characterization - Table 1 : Composition of the AZ31 Mg alloy - Table 2 : Average values obtained from the polarization curves DOI : https://doi.org/10.1007/s11998-023-00813-3 En ligne : https://drive.google.com/file/d/1PTh-UZGWR-kAHemBbzJrFl1vEwm-Eb3E/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40444 [article]

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Effectiveness of babassu starch and oil coating with plasticizers to improve shelf life of eggs / Gislane Romano Mendonça in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 255-266 Titre : Effectiveness of babassu starch and oil coating with plasticizers to improve shelf life of eggs Type de document : texte imprimé Auteurs : Gislane Romano Mendonça, Auteur ; Romário de Sousa Campos, Auteur ; Romerson Ambrósio da Silva, Auteur ; Djany Souza Silva, Auteur ; Alexsandra Fernandes Pereira, Auteur ; Virgínia Kelly Gonçalves Abreu, Auteur ; Ednardo Rodrigues Freitas, Auteur ; Ana Lúcia Fernandes Pereira, Auteur Année de publication : 2024 Article en page(s) : p. 255-266 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aliments -- Conservation Amidons Enrobage (technologie) Huile de babassu Oeufs Plastifiants Revêtements comestibles Index. décimale : 667.9 Revêtements et enduits Résumé : The purpose of this study was to develop an edible coating containing babassu starch, babassu oil, and plasticizers to maintain egg quality. Firstly, it evaluated the effects of 5% babassu starch with 10% (SC-10%), 15% (SC-15%), and 20% (SC-20%) oil coating on egg quality. The effects of polyols such as mannitol and sorbitol alone or in combination on coating effectiveness were also assessed. For the first part, all formulations containing starch and/or babassu oil effectively preserved the internal quality characteristics of weight loss and Haugh units of stored eggs for 28 days. For the yolk and albumen percentages, the eggs for the treatments containing oil (SC-10%, SC-15%, and SC-20%) had the values closest (p < 0.05) to those of fresh eggs. Thus, according to these parameters, the presence of the oil in the coatings was more efficient in delaying egg quality. Despite the increase in albumen pH with the storage, the eggs stored with coatings kept the pH around 8.5. For the yolk color, the b* values of SC-10%, SC-15%, and SC-20% varied from 22.64 to 24.25 and did not differ (p > 0.05) from fresh eggs. Regarding the shell color, ΔE values of coated eggs were higher in the starch babassu treatment (6.97), followed by the treatments SC-10% (4.79), SC-15% (5.18), and SC-20% (5.17), and finally without coating (15.95). The formulation SC-10%, which contained 5% starch and 10% babassu oil, was selected to compare plasticizers. For the plasticizers, the babassu starch and oil in combination with 30% mannitol kept better the egg quality. Weight loss was lower (p < 0.05) in eggs only with 30% of mannitol (2.69%) and the Haugh Units were higher (60.04). For the b* value of yolk, 30% of mannitol had higher values (48.83) (p < 0.05) when compared to the control treatment (40.39). Thus, the presence of babassu starch (5%) and oil (10%) in combination with 30% mannitol maintains the egg quality during 28 days of storage. This study provides an approach that can potentially be applied to egg shelf life using products of the babassu industry. Note de contenu : - MATERIALS AND METHODS : Isolation and preparation of babassu starch - Experimental design - Evaluation of different concentrations of babassu oil on egg coating preparation - Effects of mannitol and sorbitol as plasticizers on egg coating - Production and application of edible coatings - Measurement of egg weight loss and Haugh units - Measurement of percentage of albumen, yolk, and shell - Colorimetric measurement - Lipid oxidative determination and pH of yolk and albumen - Determination of foam properties - Statistical analysis - RESULTS : Evaluation of different concentrations of babassu oil on egg coating preparation - Effect of mannitol and sorbitol as plasticizers on the preparation of egg coating DOI : https://doi.org/10.1007/s11998-023-00815-1 En ligne : https://drive.google.com/file/d/1y_7FqdeUwdU1ICfYsRbd0_3ZIFQlR_Tv/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40445 [article]

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Polyacrylic acid (PAA)/Zn2+ complex films fabricated on steel substrate via one-step assembly for corrosion protection / Ru Yan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 267-280 Titre : Polyacrylic acid (PAA)/Zn2+ complex films fabricated on steel substrate via one-step assembly for corrosion protection Type de document : texte imprimé Auteurs : Ru Yan, Auteur ; Xiang Gao, Auteur ; Wei He, Auteur ; Yan Wang, Auteur ; Houyi Ma, Auteur Année de publication : 2024 Article en page(s) : p. 267-280 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acide polyacrylique Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique. L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1. C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple. Adhésion Anticorrosifs Anticorrosion Complexation (chimie) Ions zinc Métaux -- Revêtements protecteurs Revêtement de conversion Index. décimale : 667.9 Revêtements et enduits Résumé : The eco-friendly PAA/Zn2+ conversion coatings, composed of PAA-Zn2+ complex and ZnO/Zn(OH)2, have been prepared by taking advantage of coordination-driven assembly method for suppressing steel corrosion. Because of high affinity of PAA for steel surface and various metal ions, metal ions-assisted organic molecule assembly strategy used to construct chemical conversion film on metal surface has been extended to the design and construction of polyelectrolyte–metal complex conversion coating. In this work, some film properties associated closely with film formation time containing corrosion resistance, surface microstructures, and chemical compositions were carefully investigated by using electrochemical measurements, morphologies tests, and spectra analysis and possible film-forming mechanism of PAA/Zn2+ film was proposed. The highest charge transfer resistance (Rct = 24,960 ohm cm2) was recorded for PAA/Zn2+ film based on EIS, which is about 30 times higher than that of the bare steel. And minimum corrosion current density (icorr = 1.01 × 10-7 A cm-2) was obtained for PAA/Zn2+ film from polarization curves, which is only 3.34% of that obtained from bare steel. Herein, the PAA/Zn2+ conversion coatings constructed between 30 and 60 min present outstanding corrosion resistance performance and the protection efficiencies are greater than 90%. Furthermore, PAA/Zn2+ films have a positive effect on improvement in adhesion of epoxy coating on steel surface, which can further improve corrosion resistance of whole paint system, especially for PAA/Zn2+ films fabricated for long film formation time (e.g., 30 min and 45 min). Due to environmental friendliness, strong corrosion resistance, and good adhesion performance, PAA/Zn2+ conversion coatings are expected to be an ideal substitute for the traditional chromating process. Note de contenu : - EXPERIMENTAL : Materials and chemical reagents - Chemical conversion treatment - Epoxy primer treatment - Anticorrosion performance evaluation - Surface observation and analysis - RESULTS AND DISCUSSION : Corrosion resistance of PAA/Zn2+ conversion films - EIS tests - Polarization curves - Surface characterization - SEM and EDS analysis - Corrosion protection performance of paint system - Table 1 : Electrochemical parameters of naked steel and steel covered by PAA/Zn2+ films determined from EIS measurements - Table 2 : Corrosion electrochemical parameters for the naked steel and the modified steel by PAA/Zn2+ films in 3.5 wt% NaCl solution DOI : https://doi.org/10.1007/s11998-023-00818-y En ligne : https://drive.google.com/file/d/1nO0pvQ-ysQZzdu6BQbZUTdvFu7SoQlN1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40446 [article]

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Influence of dwell time and temperature on the measured gloss of printed UV-inks containing aluminum pigments / Carl Fridolin Weber in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 281-291 Titre : Influence of dwell time and temperature on the measured gloss of printed UV-inks containing aluminum pigments Type de document : texte imprimé Auteurs : Carl Fridolin Weber, Auteur ; Ilayda Polat, Auteur ; Hans Martin Sauer, Auteur ; Edgar Dörsam, Auteur ; Martin Schmitt-Lewen, Auteur Année de publication : 2024 Article en page(s) : p. 281-291 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium L'aluminium est un élément chimique, de symbole Al et de numéro atomique 13. C’est un métal pauvre, malléable, de couleur argent, qui est remarquable pour sa résistance à l’oxydation13 et sa faible densité. C'est le métal le plus abondant de l'écorce terrestre et le troisième élément le plus abondant après l'oxygène et le silicium ; il représente en moyenne 8 % de la masse des matériaux de la surface solide de notre planète. L'aluminium est trop réactif pour exister à l'état natif dans le milieu naturel : on le trouve au contraire sous forme combinée dans plus de 270 minéraux différents, son minerai principal étant la bauxite, où il est présent sous forme d’oxyde hydraté dont on extrait l’alumine. Il peut aussi être extrait de la néphéline, de la leucite, de la sillimanite, de l'andalousite et de la muscovite. L'aluminium métallique est très oxydable, mais est immédiatement passivé par une fine couche d'alumine Al2O3 imperméable de quelques micromètres d'épaisseur qui protège la masse métallique de la corrosion. On parle de protection cinétique, par opposition à une protection thermodynamique, car l’aluminium reste en tout état de cause très sensible à l'oxydation. Cette résistance à la corrosion et sa remarquable légèreté en ont fait un matériau très utilisé industriellement. L'aluminium est un produit industriel important, sous forme pure ou alliée, notamment dans l'aéronautique, les transports et la construction. Sa nature réactive en fait également un catalyseur et un additif dans l'industrie chimique ; il est ainsi utilisé pour accroître la puissance explosive du nitrate d'ammonium. Brillance (optique) -- Mesure Encre -- Séchage sous rayonnement ultraviolet Microscopie confocale Ondulation Pigments inorganiques Rugosité Index. décimale : 667.9 Revêtements et enduits Résumé : This study investigates the relationship between measured gloss and the microstructure of printed UV-inks containing aluminum pigments. Using a laboratory flexo printing machine, UV-inks containing leafing-type vacuum metallized pigments were printed onto Chromolux paper and primed MultiArt Gloss paper. The time between printing and curing of the ink (dwell time) was varied between the experimental runs. For some samples, hot air was applied onto the uncured UV-ink during the dwell time. The influence of heat (hot air) and dwell time on gloss and the topography of the pigment layer as well as the influence of the substrate was investigated. Roughness and waviness data were obtained using a confocal microscope (Sensofar PLu Neox), gloss measurements were obtained using an IQ-S gloss meter. It was shown that a longer dwell time as well as hot air has a positive influence on the specular gloss measured on the metallic ink printed on Chromolux paper. Also, good correlations could be found between specular gloss, roughness, and waviness, respectively. For primed Multi Art Gloss paper, however, a longer dwell time and hot air can have a negative influence on specular gloss. Also, correlations between roughness, waviness and specular gloss are not as strong as for Chromolux paper. Note de contenu : - Table 1 : Print setting of the laboratory flexo printing machine IGT F1 - Table 2 : Pearson correlation coefficients between measured specular gloss values and measured Sq roughness and Sq waviness values on Chromolux paper imprinted with metallic ink - Table 3 : Pearson correlation coefficients between measured specular gloss values and measured Sq roughness and Sq waviness values on primed MultiArt Gloss paper imprinted with metallic ink DOI : https://doi.org/10.1007/s11998-023-00820-4 En ligne : https://drive.google.com/file/d/1c_szx8wVd9xRpVwqZCTQZ5Gh_E_Tdk3m/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40447 [article]

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Preparation and tribological properties of MAO-PVA/PTFE self-lubricating composite coating on aluminum alloy surface in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) Titre : Preparation and tribological properties of MAO-PVA/PTFE self-lubricating composite coating on aluminum alloy surface Type de document : texte imprimé Année de publication : 2024 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alcool polyvinylique Aluminium -- Alliages Aluminium L'aluminium est un élément chimique, de symbole Al et de numéro atomique 13. C’est un métal pauvre, malléable, de couleur argent, qui est remarquable pour sa résistance à l’oxydation13 et sa faible densité. C'est le métal le plus abondant de l'écorce terrestre et le troisième élément le plus abondant après l'oxygène et le silicium ; il représente en moyenne 8 % de la masse des matériaux de la surface solide de notre planète. L'aluminium est trop réactif pour exister à l'état natif dans le milieu naturel : on le trouve au contraire sous forme combinée dans plus de 270 minéraux différents, son minerai principal étant la bauxite, où il est présent sous forme d’oxyde hydraté dont on extrait l’alumine. Il peut aussi être extrait de la néphéline, de la leucite, de la sillimanite, de l'andalousite et de la muscovite. L'aluminium métallique est très oxydable, mais est immédiatement passivé par une fine couche d'alumine Al2O3 imperméable de quelques micromètres d'épaisseur qui protège la masse métallique de la corrosion. On parle de protection cinétique, par opposition à une protection thermodynamique, car l’aluminium reste en tout état de cause très sensible à l'oxydation. Cette résistance à la corrosion et sa remarquable légèreté en ont fait un matériau très utilisé industriellement. L'aluminium est un produit industriel important, sous forme pure ou alliée, notamment dans l'aéronautique, les transports et la construction. Sa nature réactive en fait également un catalyseur et un additif dans l'industrie chimique ; il est ainsi utilisé pour accroître la puissance explosive du nitrate d'ammonium. Lubrifiants Matériaux hybrides Oxydation micro-arc Polytétrafluoréthylène Résistance à l'usure Revêtements organiques Sol-gel, Procédé Tribologie (technologie) Index. décimale : 667.9 Revêtements et enduits Résumé : In order to enhance the wear resistance of 6061 aluminum alloy, the MAO-PVA/PTFE self-lubricating composite coating was prepared on the surface of aluminum alloy using microarc oxidation (MAO) technology and solgel technique. Scanning electron microscopy and X-ray diffraction were employed to analyze the morphological properties and structures of the single MAO coating and the composite coating. Energy-dispersive spectroscopy was utilized to examine the elements present on the surface and within the wear track. Ball and disk friction tests were conducted to evaluate the wear resistance of the composite coating. Furthermore, the comprehensive friction performance of the composite coating was investigated across a range of speed variations (1 to 2.5 cm/s) and load variations (1 to 7 N). The test results revealed that the PVA-PTFE film covered the surface of the MAO coating, effectively sealing the micropores. Compared to the single MAO coating, the average coefficient of friction (COF) of the composite coating decreased significantly from 0.549 to 0.139, resulting in improved wear resistance. Moreover, the COF of the composite coating decreased with increasing velocity and load. Subsequently, the wear mechanisms of both the single MAO coating and the composite coating were discussed. The main wear mechanisms observed in the MAO coating were adhesive wear and abrasive wear, while the MAO-PVA/PTFE composite coating exhibited minimal fatigue and oxidation wear. Consequently, the composite coating effectively enhanced the wear resistance of the aluminum alloy, leading to an improved service life. Note de contenu : - EXPERIMENTAL : Fabrication of MAO coatings - Fabrication of MAO-PVA/PTFE self-lubricating composite coatings - Characterization of the coating - Friction experiments - RESULTS : Composition and structure - Tribological behavior - Effect of sliding speed on friction coefficient of composite coatings - Effect of load on friction coefficient of composite coating - Table 1 : Microarc oxidation (MAO) process parameters DOI : https://doi.org/10.1007/s11998-023-00821-3 En ligne : https://drive.google.com/file/d/1nhzKVLFH0BHD0NyP1hDAqa3p2ASyaKJj/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40448 [article]

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Highly improved UV-shielding and mechanical properties of UV-curable epoxy acrylate nanocomposites by incorporating functionalized aramid nanofibers / Ying Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 307-317 Titre : Highly improved UV-shielding and mechanical properties of UV-curable epoxy acrylate nanocomposites by incorporating functionalized aramid nanofibers Type de document : texte imprimé Auteurs : Ying Wang, Auteur ; Yuexin Luo, Auteur ; Yuankai Pan, Auteur ; Changmei Sun, Auteur ; Ying Zhang, Auteur ; Chunnuan Ji, Auteur ; Rongjun Qu, Auteur Année de publication : 2024 Article en page(s) : p. 307-317 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aramides Les polyamides aromatiques, ou aramides, sont une classe de matériaux résistant à la chaleur et/ou présentant de bonnes propriétés mécaniques. Ils ne peuvent être utilisés que comme fibres, qui servent surtout à la fabrication de matériaux composites, en renfort de matrices. Le mot-valise "aramide" vient de la contraction de l'anglais aromatic polyamide. Les fibres sont obtenues par filage (étirage au travers d'une filière) à partir d'une dissolution. Les chaînes moléculaires sont fortement orientées dans le sens de l'axe de la fibre, de sorte que les forces des interactions moléculaires peuvent être exploitées pour la résistance thermique et/ou mécanique. Caractérisation Charges (matériaux) Composés organiques -- Synthèse Copolymère époxy acrylate Fibre aramide Matériaux -- Propriétés fonctionnelles Matériaux hybrides Nanofibres Revêtements -- Propriétés mécaniques Revêtements -- Séchage sous rayonnement ultraviolet Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Introducing nanofillers into UV-curable coatings can not only effectively improve the performance of the coating but also impart new functions to the film. Herein, methacrylate-functionalized aramid nanofibers (mANFs) were constructed by a bottom-up approach, and their influence on the performance of UV-curable epoxy acrylate (EA) coatings was investigated. The microstructure of the EA/mANF nanocomposite was studied using X-ray diffraction and transmission electron microscopy (TEM), which confirmed the homogeneous distribution of mANFs in the matrix. The effect of mANFs on the curing kinetics was investigated. The result showed that the photopolymerization rate and final C = C bond conversion would not be adversely affected until more than 0.1 wt% mANFs were added. The UV–Vis analyses showed that the EA/mANF films maintained high transmittance in the visible light region and exhibited improved UV-shielding performance. The mechanical characteristics of EA/mANF films were significantly improved by mANFs because of strong interactions such as π–π interactions, hydrogen bonds, and chemical bonds between the matrix and mANFs. For the nanocomposite containing 0.025 wt% mANFs, tensile strength and strain at break increased by 53% and 446%, respectively, compared to neat EA. Thus, the introduction of mANFs considerably improved the mechanical performance of UV-curable EA films and expanded their application in the field of UV shielding. Note de contenu : - EXPERIMENTAL : Chemical and materials - Synthesis of methacrylate-functionalized ANFs (mANFs) - Synthesis of UV-curing EA/mANF nanocomposites - Characterization - RESULTS : Characterization of mANFs - Structure and morphological investigation of EA/mANF nanocomposites - Curing kinetics and transmittances investigation of EA/mANF nanocomposites - Mechanical properties of EA/mANF nanocomposites DOI : https://doi.org/10.1007/s11998-023-00822-2 En ligne : https://drive.google.com/file/d/1Hvchg-CTDPRYRSVnD0cvIjtvA6Kevz6o/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40449 [article]

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Synthesis of poly(propylene carbonate) diol-based waterborne polyurethane modified by epoxy resin with anticorrosion properties / Yiheng Xiao in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 319-328 Titre : Synthesis of poly(propylene carbonate) diol-based waterborne polyurethane modified by epoxy resin with anticorrosion properties Type de document : texte imprimé Auteurs : Yiheng Xiao, Auteur ; Wei Ou, Auteur ; Zonglin He, Auteur ; Zhu Ding, Auteur ; Jiaoyan Ai, Auteur ; Lina Song, Auteur ; Baohua Liu, Auteur Année de publication : 2024 Article en page(s) : p. 319-328 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Anticorrosifs Anticorrosion Caractérisation Epoxydes Essai Wolff-Wilborn Polymères -- Synthèse Polymères en émulsion Polyuréthanes Revêtements en phase aqueuse Revêtements organiques Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : A series of modified waterborne polyurethane (WPU) with various epoxy contents was synthesized from poly (propylene carbonate) diol (PPCD)-based polyurethane prepolymer and ring-opening epoxy resin (RO-EP). The particle size, storage stability, and freeze-thaw resistance of the emulsions were examined. The pencil hardness and adhesion level of the films were tested. The structure of the modified waterborne polyurethane was characterized by Fourier transform infrared spectroscopy. The thermal stability of the modified waterborne polyurethane was studied by thermogravimetric analysis. The corrosion resistance of emulsion coating was tested by the salt spray test and electrochemical impedance spectroscopy (EIS). The waterborne polyurethane emulsion modified by RO-EP had excellent storage stability. When the content of the ring-opening epoxy resin was 10 wt%, the particle size of WPU was the smallest. The corresponding coating had excellent hardness and adhesion level. The salt spray and EIS test showed that the WPU coating with 10% RO-EP had superior corrosion resistance. Note de contenu : - EXPERIMENTAL : Materials - Preparation of RO-EP - Preparation of E-WPU - Preparation of E-WPU films - Characterization - RESULTS AND DISCUSSION : Fourier transform infrared spectroscopy (FTIR) analysis - TGA analysis - Particle size analysis - Adhesion and hardness test analysis - Salt spray test - EIS measurement - Table 1 : Reactant proportions of WPU and E-WPU - Table 2 : TGA data of WPU and E-WPU films with various RO-EP contents - Table 3 : Properties of WPU and E-WPU emulsions - Table 4 : Adhesion level and pencil hardness of WPU and E-WPU films - Table 5 : Impedance modulus of coatings at different time DOI : https://doi.org/10.1007/s11998-023-00823-1 En ligne : https://drive.google.com/file/d/14Xy6b0xZPvCh7CAHet2LxIJwwjmj0GlQ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40450 [article]

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Properties evaluation of double silane system compound gel as a protective coating on concrete / Xu Chen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 329-340 Titre : Properties evaluation of double silane system compound gel as a protective coating on concrete Type de document : texte imprimé Auteurs : Xu Chen, Auteur ; Yan Gao, Auteur ; Youlai Zhang, Auteur ; Mengjun Hu, Auteur ; Yongjuan Geng, Auteur ; Shaochun Li, Auteur ; Shiyu Sui, Auteur ; Guozhu Liang, Auteur Année de publication : 2024 Article en page(s) : p. 329-340 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Colloides Durée de vie (Ingénierie) Enrobage (technologie) Hydrophobie Matériaux cimentaires -- Revêtements protecteurs Silanes Sol-gel, Procédé Index. décimale : 667.9 Revêtements et enduits Résumé : Inhibiting moisture transfer at the surface of concrete plays a vital role on the durability of concrete, and permeable protective coating can effectively resist the intrusion of external moisture into concrete. A double silane system compound gel was prepared through sol–gel synthesis method by using isobutyl triethoxy silane and tetraethyl orthosilicate, solving the problems of volatility and poor adhesion of traditional silane-based penetrating protective materials. The performance of the compound gel was verified through static contact angle, capillary water absorption of concrete with cracks, electrochemical accelerated ion penetration, and rapid carbonation tests. The test results showed that the capillary water absorption coefficient for concrete with cracks up to 0.5 mm and coating compound gel was reduced by more than 70% compared to blank; the corrosion time of inserted reinforcement in concrete treated with the compound gel was extended by more than two times compared to blank. The research of compound gel can expand the application market of silane-based protective materials, especially for some longitudinal concrete structural parts that need higher durability requirements. Note de contenu : - MATERIALS AND METHODS : Preparation of waterproof material - Test concrete substrate - Characterization of compound gel on concrete - Concrete durability test - RESULTS AND DISCUSSION : Bonding and hydrophobic properties of the synthesized compound gel on concrete - Analysis of electrochemical accelerated corrosion test results - Analysis of rapid carbonation test results - Analysis of waterproofing property of crack-damaged concrete test results - Table 1 : Raw materials and reagents for the preparation of compound gel - Table 2 : Physical and chemical properties of P·O 42.5 - Table 3 : Mixing ratios of concrete unit: kg·m-3 - Table. 4 : TCI for various types of coating - Table 5 : Capillary water absorption coefficient of concrete coated with various silane materials under various crack widths DOI : https://doi.org/10.1007/s11998-023-00824-0 En ligne : https://drive.google.com/file/d/1jn9PLI0Tpx_T0pyHXdU6hCYD06GRWTOU/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40456 [article]

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Preparation of crosslinkable cationic polyacrylate latex and its film properties / Xueke Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 341-354 Titre : Preparation of crosslinkable cationic polyacrylate latex and its film properties Type de document : texte imprimé Auteurs : Xueke Zhang, Auteur ; Kaimin Chen, Auteur ; Ziwei Li, Auteur ; Qianqian Zhang, Auteur ; Chenming Xu, Auteur ; Yue Chang, Auteur ; Shaoguo Wen, Auteur Année de publication : 2024 Article en page(s) : p. 341-354 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bases (chimie) Humidité -- Absorption:Eau -- Absorption Latex Polyacrylates Polymères cationiques Polymérisation en émulsion Résistance chimique Revêtements -- Propriétés mécaniques Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Cationic polyacrylate latex has attracted extensive attention due to its special properties and potential applications in wood primers, metal coatings, and fabric treatments, etc. However, cationic polyacrylate latex has poor durability and stability, which limits its use in practical applications. In this study, a functional cationic monomer (3-chloro-2-hydroxypropyl) dimethyl [2-[(2-methyl-1-oxoallyl)oxy]ethyl] ammonium chloride (DEAC) was combined with two conventional monomers of methyl methacrylate (MMA) and butyl acrylate (BA) to prepare cationic polyacrylate latex by a semi-continuous emulsion polymerization. The obtained latexes showed typical cationic character with zeta potential in the range of + 40 to + 65 mV. The effect of DEAC on the stability of latex was studied and good alkali resistance could be gained at high DEAC content. Water resistance and mechanical properties of the film before and after crosslinking are studied in detail. The results showed that the water absorption reduced from 60.04% to a minimum of 9.18%, and the tensile strength increased from 3.9 to 8.4 MPa, which was comparable to solvent-based polyacrylate films. This work provides a new strategy for the preparation of waterborne cationic polyacrylate latex with improved water resistance and good mechanical properties, etc., which can be applied in papermaking, textiles, wood primers, and other potential fields. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of DEAC - Synthesis of cationic polyacrylate latex P(MMA-co-BA-co-DEAC) - Preparation of cationic polyacrylate film - Characterization - RESULTS AND DISCUSSION : Effect of DEAC on polyacrylate latex - Effect of DEAC on stability properties - Film properties - Table 1 : Properties of cationic polyacrylate latex with different amounts of DEAC - Table 2 : Properties of cationic polyacrylate latex with different amount of DEAC DOI : https://doi.org/10.1007/s11998-023-00826-y En ligne : https://drive.google.com/file/d/143nNUjIN202dKWmu9uZH5XyWG-Zz61cy/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40457 [article]

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Phytic acid oligomers as bio-based crosslinkers for epoxy and polyol resins / P. Böhm in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 355-367 Titre : Phytic acid oligomers as bio-based crosslinkers for epoxy and polyol resins Type de document : texte imprimé Auteurs : P. Böhm, Auteur ; Michael Dornbusch, Auteur ; J. S. Guttmann, Auteur Année de publication : 2024 Article en page(s) : p. 355-367 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermomécanique dynamique Biopolymères Caractérisation Epoxydes Oligomères Phytique, Acide Polymères -- Synthèse Polyols Ressources renouvelables Réticulants Réticulation (polymérisation) Revêtements organiques Stabilité thermique Index. décimale : 667.9 Revêtements et enduits Résumé : In recent years, the chemical industry is not only striving to produce the best possible products for various applications, but the new products should ideally be based on renewable resources. The ideal case of "cradle to cradle" is generally not achievable in the coatings industry, as maximizing product life and preventing product degradation in the environment is usually one of the main goals of the coatings industry. Therefore, if the coatings industry wants to act sustainably, its efforts should be focused on renewable raw materials. This paper presents a process that makes the renewable raw material phytic acid easily accessible for conventional epoxy and polyol resin coating systems through hydrophobization- and oligomerization. Phytic acid, as a phosphorus reservoir in plants and with beneficial properties for corrosion protection and as a flame retardant, could be a new base for various coatings. In this work, a simple one-pot oligomerization of phytic acid with green mono- and difunctional alcohols is investigated. The aim of this work is to create a phytic acid hardener system based on renewable raw materials that can produce coatings with solvent-based epoxy and polyol binders as well as water-based epoxy binders. The successful reaction was observed by infrared, 1H-NMR, and 31P-NMR spectroscopy and the acid equivalent weight was determined by conductivity titration. The renewable curing agent was then used equivalently with different binder systems to prepare coatings. Crosslinking and glass transition temperature were monitored using oscillatory rheology. The coatings were applied to glass plates and the pendulum hardness was measured. A simple heating test followed by 31P-NMR and IR spectroscopy was also performed to demonstrate the stability of phytic acid under reaction conditions. Note de contenu : - EXPERIMENTAL : Analytical methods - Materials - Synthesis - Synthesis overview - Thermal stability - Network formation - Pigment paste preparation - Additional measurements - RESULTS AND DISCUSSION : Thermal stability - Synthesis and characterization - Network formation - Application testing - Dispersing and hardening agent - Table 1 : Theoretical composition of the PA-oligomers - Table 2 : Application data of various PA-oligomers with different binders - Table 3 : Color measurement of dried pigment pastes - Table 4 : Application data of PA-oligomer/ Bayferrox 130 M pigment paste with different binders DOI : https://doi.org/10.1007/s11998-023-00827-x En ligne : https://drive.google.com/file/d/1mOh6hQb3FLC0dh8Sa3R3FVKIgR1gDTKI/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40458 [article]

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Synthesis of phytic acid-layered zinc oxide hybrid nanoparticles and their flame-retardant applications in polyurethane coatings / Karan Bansal in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 369-382 Titre : Synthesis of phytic acid-layered zinc oxide hybrid nanoparticles and their flame-retardant applications in polyurethane coatings Type de document : texte imprimé Auteurs : Karan Bansal, Auteur ; Siavash Mansouri, Auteur ; Dilpreet Bajwa, Auteur ; Shanti Swarup, Auteur ; Mohiuddin Quadir, Auteur Année de publication : 2024 Article en page(s) : p. 369-382 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Enrobage (technologie) Ignifugeants Composé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface. Nanoparticules -- Synthèse Oxyde de zinc Phytique, Acide Polyuréthanes Revêtements -- Additifs Revêtements -- Propriétés thermiques Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Phytic acid (PA)-coated zinc oxide (ZnO) nanoparticles were developed to produce high-efficiency flame-retarding (FR) additives for coating formulations. These hybrid (organic/inorganic) additives were fabricated using a layer-by-layer (LBL) approach to harness the FR properties of PA and ZnO on a single-platform nanoscale scaffold. These nanoparticles can be uniformly dispersed in a polyurethane (PU) coating for applications on metal substrates. The incorporation of the PA/ZnO layer-by-layer nanoparticles at 20 wt% of the polymeric resin did not adversely affect the physico-mechanical properties of the coatings. Flame-retardant properties of PU samples containing nanomaterials, showed a 50% reduction in flame spread rate than that observed from the samples prepared with only ZnO nanoparticles. Cone calorimeter studies performed on the metal panels coated with 20 wt% PA/ZnO nanoparticles-infused PU resins showed a 25% reduction in peak heat release rate and a 50% reduction in total heat release (THR) compared to control coatings prepared without nanoparticles. Scanning electron microscopy images revealed the presence of bubble-like morphologies in the burnt samples containing the nanoparticles, indicating char formation and obstruction of escaping gases produced during the burning of the coating materials. This study clearly reveals that the coatings prepared with PA/ZnO hybrid nanoparticles can protect metal substrates against fire-related damage. Note de contenu : - MATERIALS : Methods - Characterization of nanoparticles - Characterization of PU coatings on metal substrates - RESULTS AND DISCUSSION : Synthesis of PA-layered ZnO nanoparticles as functional FR nanomaterials - Nano-chemical and thermal characterization of nanoparticles - Incorporation of PA-layered ZnO nanoparticles in PU coatings and analysis of coating properties - Characterization of thermal properties of PU coatings containing PA/ZnO nanoparticles using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) - Evaluation of FR properties using cone calorimeter studies - Horizontal burning test of UL-94 samples prepared from nanoparticle-infused PU resins - Table 1 : Particle size (hydrodynamic diameter) of the nanoparticles along with PDI and zeta potential - Table 2 : Coating properties of polyurethane (PU) formulations containing ZnO nanoparticles and ZnO/PA-BL nanoparticles at different loading concentrations - Table 3 : Glass transition temperature (Tg), degradation temperature at 5% weight loss (Td5), and weight remaining of the film after exposure to 500°C of the polyurethane coatings - Table 4 : Time to ignition (TTI), peak heat release rate (pHRR), total heat release (THR), total smoke release (TSR), and flame retardancy index (FRI) of control coating and coatings containing ZnO and ZnO/PA-BL nanoparticles at 20 wt% loading concentration DOI : https://doi.org/10.1007/s11998-023-00828-w En ligne : https://drive.google.com/file/d/13XsUainuKttYmpAr5TC8PkMi_hhQEXdE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40459 [article]

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Behavior of biocide-free foul control paints for ships’ hulls in the immediate proximity of ICCP anodes / F. Castelli in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 383-399 Titre : Behavior of biocide-free foul control paints for ships’ hulls in the immediate proximity of ICCP anodes Type de document : texte imprimé Auteurs : F. Castelli, Auteur ; M. Delucchi, Auteur ; F. Valenza, Auteur ; F. Garaventa, Auteur ; M. Faimali, Auteur ; T. Turturro, Auteur ; A. Benedetti, Auteur Année de publication : 2024 Article en page(s) : p. 383-399 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Coques (architecture navale) Fluoropolymères pH Revêtement autopolissant Revêtements antisalissures:Peinture antisalissures Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Impressed current cathodic protection systems are used in combination with organic coatings to prevent corrosion of hulls. The reaction species which are formed in the proximity of the anodes, like chlorinated compounds and acidity, can stress the antifouling paints of the protective coating system. A 3 × 3 matrix was defined to drive the tests aiming to investigate the behavior of novel biocide-free foul release (FR) and self-polishing (SP) paints under this kind of attack. The matrix was featured by different pH and free chlorine (free-Cl) values derived by a galvanostatic test performed at an anodic current density required for the protection of paints roughly at their mid age. Chemical/physical characterization was performed through visual analysis, thickness measurements, profilometry, contact angle measurements, and FTIR-ATR analysis. Both FR and SP paints underwent adhesive failure only in the harshest conditions, pH = 3/free-Cl 3–6 ppm, with unmodified chemistry of the polymers. Both paints exhibited no detachment in milder pH/free-Cl conditions, but thickness and contact angle reduction were observed. Finally, results were discussed inferring possible behaviors of the tested paints in real applications. Note de contenu : - EXPERIMENTAL : Materials - Methods - RESULTS : Determination of the pH/free-Cl conditions - Maintenance of the pH/free-Cl conditions - Evaluation of the physical and chemical properties of the paint systems - SUMMARY OF THE RESULTS - DISCUSSION : Thickness reduction, blistering, and detachment - Contact angle, profilometry - Interpretation of the results in the framework of real applications - Table 1 : Binder and dry film thickness (DFT) of the coats composing the FR and SP coating systems - Table 2 : Sa values by profilometry on SP and FR paints before/after the chemical treatments DOI : https://doi.org/10.1007/s11998-023-00830-2 En ligne : https://drive.google.com/file/d/1qN6gSQmmpiGLNc11MA1UjZXcNbrCWrsG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40460 [article]

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Graphene-modified hybrid coating for improving the atomic oxygen erosion resistance of Kapton in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 401-411 Titre : Graphene-modified hybrid coating for improving the atomic oxygen erosion resistance of Kapton Type de document : texte imprimé Année de publication : 2024 Article en page(s) : p. 401-411 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dioxyde de silicium Graphène Le graphène est un cristal bidimensionnel (monoplan) de carbone dont l'empilement constitue le graphite. Il a été isolé en 2004 par Andre Geim, du département de physique de l'université de Manchester, qui a reçu pour cette découverte le prix Nobel de physique en 2010 avec Konstantin Novoselov. Il peut être produit de deux manières : par extraction mécanique du graphite (graphène exfolié) dont la technique a été mise au point en 2004, ou par chauffage d'un cristal de carbure de silicium, qui permet la libération des atomes de silicium (graphène epitaxié). Record en conduction thermique jusqu'à 5300 W.m-1.K-1. C'est aussi un matériaux conducteur. Matériaux hybrides Oxygène atomique Revêtements Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Index. décimale : 667.9 Revêtements et enduits Résumé : To improve the atomic oxygen (AO) erosion resistance of Kapton for application as an aerospace material in low earth orbit (LEO), a graphene-modified polysiloxane-60 vol.% SiO2 (G-PSS) composite coating was prepared and tested for AO exposure at a total flux of 1.86 × 1020 atoms/cm2. The prepared coating with a thickness of 5 μm was smooth, with good adhesion and no macroscopic defects. Its AO erosion yield was 9.77 × 10−27–1.25 × 10−26 cm3/atom, which was about three orders and one order of magnitude lower than that of Kapton and polysiloxane-60vol.%SiO2 (PSS) hybrid coating, respectively. The beneficial effect of graphene was attributed to the effective inhibition of gas permeation by the single-layer graphene due to its unique structure and the more stable epoxy groups produced during the reaction of graphene with AO. Note de contenu : - EXPERIMENTAL : Preparation of the G-PSS composite coating - AO exposure test - Surface morphology and phase composition - RESULTS AND DISCUSSION : Characterizations of the composite coating - AO erosion - Effect of graphene in the composite coating - Table 1 : Appearance and adhesion classification of coatings according to the cross-cut test standard - Table 2 : Element concentrations of Si, C, and O on the surface of the G-PSS composite coating before and after AO exposure DOI : https://doi.org/10.1007/s11998-023-00832-0 En ligne : https://drive.google.com/file/d/13mhKToJpvm6zHqeLs0PUjCTVLcdMQrbW/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40461 [article]

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NH4HCO3 as additive for fabrication of thin film nanocomposite membrane with enhanced permeability / Yanchun Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 413-421 Titre : NH4HCO3 as additive for fabrication of thin film nanocomposite membrane with enhanced permeability Type de document : texte imprimé Auteurs : Yanchun Li, Auteur ; Shilin Zhou, Auteur ; Jin He, Auteur ; Yuwen Lai, Auteur ; Wentao Yan, Auteur ; Yong Zhou, Auteur ; Congjie Gao, Auteur Année de publication : 2024 Article en page(s) : p. 413-421 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Couches minces Membranes (technologie) Moussants Nanobulles Nanofiltration Index. décimale : 667.9 Revêtements et enduits Résumé : During interfacial polymerization, the in situ growth of nanobubbles can exist between the support layer and the separation layer of the membrane, which changes the microstructure of the membrane and improves its performance. The incorporation of R812s SiO2 in the preparation of the mixed matrix nanofiltration membrane increases the surface interface pores, thereby improving the flux. In this study, NH4HCO3 foaming agent was introduced into the aqueous phase of the R812s SiO2 nanofiltration membrane to react with the byproduct HCl generated during the interface process, thus generating nanobubbles that exist between the support layer and the separation layer. The surface of the membrane was characterized by related instruments. It was found that the addition of NH4HCO3 generates a large number of nanobubbles, causing significant changes to the membrane surface, and resulting in increased protrusions and pore size, greatly improving membrane flux while slightly reducing the rejection of sodium sulfate. Note de contenu : - EXPERIMENTAL : Materials and chemicals - Membrane preparation - Characterization of membranes - Testing of separation performances - RESULTS AND DISCUSSION : Influence of the NH 4 HCO 3 concentration - Optimization of reaction monomer - Optimization of TMC monomer - Optimization of PIP monomer - Table 1 : Specific preparation parameters of TFN membrane DOI : https://doi.org/10.1007/s11998-023-00834-y En ligne : https://drive.google.com/file/d/1fSntPfrbgUJxHftnPQaEUd-NYC_LC0hS/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40462 [article]

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Wet coating of calcite with silica nanoparticles in CO2 environment / Qitong Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 423-434 Titre : Wet coating of calcite with silica nanoparticles in CO2 environment Type de document : texte imprimé Auteurs : Qitong Liu, Auteur ; Payam Hosseini, Auteur ; Raghavendra Ragipani, Auteur ; Bu Wang, Auteur Année de publication : 2024 Article en page(s) : p. 423-434 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Calcite Grâce à leurs performances analytiques, on observe un intérêt croissant pour l’utilisation des installations en rayonnement synchrotron et de certains appareils portables employant des sources de rayons X afin d’analyser, de révéler et de conserver les matériaux des objets du patrimoine. La diffraction des rayons X va ainsi permettre de révéler la complexité de la nature des pigments utilisés par les artistes : c’est par la structure de la matière cristalline que l’on peut comprendre certaines de leurs propriétés optiques et mécaniques ainsi que leurs modes de synthèse. Caractérisation Dioxyde de silicium Enrobage (technologie) Granulométrie Nanoparticules Particules (matières) Potentiel zeta Revêtement humide Index. décimale : 667.9 Revêtements et enduits Résumé : Calcite particles coated with nano-silica find use in applications such as enhanced oil recovery, paper-making, and thermal energy storage. In this study, the surface coating of calcite particles by silica nanoparticles (nano-SiO2) in aqueous solutions assisted by a CO2 environment was investigated. The result indicates that the coating performance can be controlled by altering the electrostatic attraction between calcite and nano-SiO2, with the calcite surface charge being the predominant factor. An elevated CO2 partial pressure (up to 3.7 atm) is beneficial for the coating process. However, similar coating performance can be achieved under lower CO2 partial pressures by introducing calcium salt into the aqueous solution. With the addition of 15 wt% of nano-SiO2 in a 6.5 mM CaCl2 solution, a nano-SiO2 loading content of 12.6 wt% (with an average calcite particle size of 6.74 µm) was achieved under 1 atm CO2 pressure after 24 h of the coating experiment. Overall, the coating of calcite surfaces with high contents of well-dispersed nano-SiO2 can be achieved in a CO2 environment, and calcium salts can be used to reduce the required CO2 pressure. As such, it is potentially feasible to integrate wet coating into aqueous carbonation-based CO2 mineralization processes to enhance process economics by making nano-SiO2-coated calcite a valuable byproduct. Note de contenu : - MATERIALS AND METHODS : Materials - Coating experiment - Sample characterizations - Particle size analysis (PSA) - Scanning electron microscopy (SEM) - Thermogravimetric analysis (TGA) - Zeta potential (ZP) measurement - Surface area measurement - Stability test - RESULTS AND DISCUSSION : Characterization of calcite coated with nano-SiO2 - Effect of the CO2 environment on coating performance - Role of calcium concentration in coating performance - Enhancing the experimental feasibility and loading content - Table 1 : The zeta potential of calcite and nano-SiO2 - Table 2 : Quantity of coated nano-SiO2 before and after stability tests DOI : https://doi.org/10.1007/s11998-023-00812-4 En ligne : https://drive.google.com/file/d/1zoCnzLvSPDBemL0-7QZUZBTVJBQUMfjp/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40463 [article]

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