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Using visible light to activate antiviral and antimicrobial properties of TiO2 nanoparticles in paints and coatings : focus on new developments for frequent-touch surfaces in hospitals / M. Schutte-Smith in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 789-817 Titre : Using visible light to activate antiviral and antimicrobial properties of TiO2 nanoparticles in paints and coatings : focus on new developments for frequent-touch surfaces in hospitals Type de document : texte imprimé Auteurs : M. Schutte-Smith, Auteur ; E. Erasmus, Auteur ; R. Mogale, Auteur ; N. Marogoa, Auteur ; A. Jayiya, Auteur ; H. G. Visser, Auteur Année de publication : 2023 Article en page(s) : p. 789-817 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Dioxyde de titane Enrobage (technologie) Lumière visible Nanoparticules Photocatalyse Revêtements antiviraux Revêtements organiques Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : The COVID-19 pandemic refocused scientists the world over to produce technologies that will be able to prevent the spread of such diseases in the future. One area that deservedly receives much attention is the disinfection of health facilities like hospitals, public areas like bathrooms and train stations, and cleaning areas in the food industry. Microorganisms and viruses can attach to and survive on surfaces for a long time in most cases, increasing the risk for infection. One of the most attractive disinfection methods is paints and coatings containing nanoparticles that act as photocatalysts. Of these, titanium dioxide is appealing due to its low cost and photoreactivity. However, on its own, it can only be activated under high-energy UV light due to the high band gap and fast recombination of photogenerated species. The ideal material or coating should be activated under artificial light conditions to impact indoor areas, especially considering wall paints or frequent-touch areas like door handles and elevator buttons. By introducing dopants to TiO2 NPs, the bandgap can be lowered to a state of visible-light photocatalysis occurring. Naturally, many researchers are exploring this property now. This review article highlights the most recent advancements and research on visible-light activation of TiO2-doped NPs in coatings and paints. The progress in fighting air pollution and personal protective equipment is also briefly discussed. Note de contenu : - TOWARD VISIBLE-LIGHT ACTIVITY-DOPING : Metal dopants: reducing band gap energy - Non-metal dopants: reducing band gap energy - Photocatalytic activity - Antibacterial activity : crystal properties and dopants for visible-light photocatalytic disinfection - Dopants in coatings and paints - Dopants and incorporation into textiles - Antimicrobial activity of TiO2 in coatings and paint - ENVIRONMENTALLY FRIENDLY SYNTHESIS OF TIO2 - FINAL THOUGHTS AND FUTURE PROSPECTS DOI : https://doi.org/10.1007/s11998-022-00733-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00733-8.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39430 [article]

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Advance of design and application in self-healing anticorrosive coating: a review / Shasha He in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 819-841 Titre : Advance of design and application in self-healing anticorrosive coating: a review Type de document : texte imprimé Auteurs : Shasha He, Auteur ; Yijian Gao, Auteur ; Xinghou Gong, Auteur ; Chonggang Wu, Auteur ; Hongyu Cen, Auteur Année de publication : 2023 Article en page(s) : p. 819-841 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Encapsulation Nanoparticules Polymères Revêtement autoréparant Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : As a significant method to inhibit metal corrosion by blocking the diffusion of corrosive mediums to the metal surface, the anticorrosion coating with a self-healing function can actively repair a damaged structure and improve the anticorrosion performance to better meet actual needs. In this study, “external aid” and “intrinsic triggering” self-healing coatings have been introduced in detail, including the preparation method, healing mechanism and practical applications. The healing of “external aid” is based on the addition components such as microcapsules containing healing agents and functional nanoparticles, whose ability of self-healing shows the independence with the coating resin. But the finitely additive amount may limit the sustainable use of “external aid” components, and the abundant fillers also change the basic physical properties of the coating. On the contrary, the “intrinsic triggering” resins can form the cover layer in the defects owing to the physical or chemical reactions between the polymer chains, along with the unlimited cycles theoretically. By contrast, the small defects or gaps can be repaired gradually through chain reactions, but the large areas of damage may need the quick release of healing additives in “external aid” coating. In this review, the advances of two kinds of self-healing coatings were analyzed to discuss the advantages and disadvantages of various healing technologies, and the challenges of development and prospects were also forecasted to provide useful ideas. Note de contenu : - EXTERNAL SELF-HEALING COATING :Microcapsule-based self-healing coating - Hollow network self-healing coating - Nanomaterials filled system - INTRINSIC SELF-HEALING MATERIAL : Self-healing based on reversible covalent bonds - Self-healing based on reversible noncovalent bonds DOI : https://doi.org/10.1007/s11998-022-00735-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00735-6.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39431 [article]

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Waterborne etherified MF and PVAc hybrid resin containing nanoclay as intumescent flame-retardant plywood coatings / Chih-Shen Chuang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 843-856 Titre : Waterborne etherified MF and PVAc hybrid resin containing nanoclay as intumescent flame-retardant plywood coatings Type de document : texte imprimé Auteurs : Chih-Shen Chuang, Auteur ; Kuang-Chong Wu, Auteur ; Horn-Jiunn Sheen, Auteur Année de publication : 2023 Article en page(s) : p. 843-856 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Argile Copolymère mélamine-formaldéhyde Ethérification Fourier, Spectroscopie infrarouge à transformée de Ignifugeants Composé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface. Intumescence (chimie) Matériaux hybrides Nanoparticules Polyacétate de vinyle Résonance magnétique nucléaire Revêtements en phase aqueuse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : The flame retardancy of waterborne intumescent coatings for plywood has been investigated. Different concentrations (1%, 3%, 5%, and 10%) of organoclay (Cloisite 15A) were added to a hybrid (etherified melamine formaldehyde and polyvinyl acetate) resin to generate coatings. The CO and CO2 emissions from the coatings during combustion were determined. An intumescent coating containing organoclay exhibited superior flame-retardant properties than does the pure hybrid resin. By comparing the performance of intumescent coatings prepared using organoclay and unmodified clay, it has been demonstrated that coatings contain the modified clay that have better flame-retardant properties. The presence of organoclay in the coating promotes the formation of an ideal char layer during combustion when the concentration is 3%. Intumescent coatings containing organoclay undergo combustion with lower CO emissions, but greater CO2 emission. 13C, 27Al, and 31P solid-state nuclear magnetic resonance spectroscopy and Fourier transform infrared spectroscopy were used to determine the chemical structure of the char layers to determine the mechanism underlying char formed upon combustion and delineate the process of char degradation. Based on the observed flammability and CO/CO2 emission, intumescent coatings containing 3% or 5% organoclay display a greater reduction in flammability than do coatings containing higher concentrations of the organoclay. Note de contenu : - EXPERIMENTAL : Materials - Sample preparations - Cone calorimeter tests - Thermal properties of the intumescent coatings - FTIR spectroscopy - 13C, 27Al, and 31P solid-state NMR spectroscopy - RESULTS AND DISCUSSION : Testing the flame retardancy of modified and unmodified clay - Thermal properties of intumescent coatings - Gas emissions of intumescent coatings - FTIR analysis - Table 1 : Different formulations of intumescent coatings in a solid weight ratio (w/w) - Table 2 : Weight loss and temperature degradation of different amounts of organoclay by thermogravimetric analysis DOI : https://doi.org/10.1007/s11998-022-00607-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00607-5.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39432 [article]

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CoaST Maritime Test Centre : an investigation of biofouling propensity / Morten L. Pedersen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 857-868 Titre : CoaST Maritime Test Centre : an investigation of biofouling propensity Type de document : texte imprimé Auteurs : Morten L. Pedersen, Auteur ; Burak Ulusoy, Auteur ; Claus Erik Weinell, Auteur ; Frederikke B. Zilstorff, Auteur ; Songgeng Li, Auteur ; Kim Dam-Johansen, Auteur Année de publication : 2023 Article en page(s) : p. 857-868 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Encrassement Essais (technologie) Evaluation Revêtements -- Détérioration Salissures biologiques Test d'immersion Index. décimale : 667.9 Revêtements et enduits Résumé : The performance of fouling control coatings (FCC) is evaluated based on static exposure on test sites worldwide. There are different standards concerning the evaluation of the performance of the FCC. However, to the knowledge of the authors, there is not a standardized reporting guideline for how to evaluate the test site in which the FCC is exposed. Several factors such as water conditions, seasonal biofouling, and accessibility of sunlight can vary dependent on placement within or between test sites. This in turn makes it difficult to compare the performance of FCC exposed at different locations within a or at another test site. In this study, an analysis of the CoaST Maritime Test Centre (CMTC) has been performed to investigate how geographical orientation and changes in depth influence the biofouling propensity on coated panels. The investigation showed no statistical significance in the biofouling propensity between panels exposed to different geographical orientations at the CMTC. Similarly, no statistical significance was found between panels placed at different depths at the CMTC. If similar reporting was performed at other test sites, a better basis for comparison of FCC worldwide would be obtained, and this could be achieved with a standardized reporting guideline. Note de contenu : - METHOD : CoaST Maritime Test Centre - Test panels - Evaluation method - RESULTS AND DISCUSSION : Biofouling environment at the CMTC - The influence of geographical orientation on the biofouling propensity - The influence of depth on the biofouling propensity - Horizontal setup - Standardized reporting for comparability of FCC within and between test sites - Table 1 : The coverage percentage intervals and the related weighted values for the four biofouling categories - Table 2 : Investigation of the influence of geographical orientation on biofouling growth - Table 3 : The significance of the biofouling deviation between the cartridges fourth and fifth row, due to the difference in depth DOI : https://doi.org/10.1007/s11998-022-00707-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00707-w.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39433 [article]

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Antistatic and antibacterial two-component waterborne polyurethane coating / Xianwen Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 869-881 Titre : Antistatic and antibacterial two-component waterborne polyurethane coating Type de document : texte imprimé Auteurs : Xianwen Li, Auteur ; Xinmeng Xu, Auteur ; Faai Zhang, Auteur Année de publication : 2023 Article en page(s) : p. 869-881 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Antistatiques Caractérisation Cuivre Nanoparticules Polyaniline Polyuréthanes Revêtements bi-composant Revêtements en phase aqueuse Revêtements organiques Zircone Le dioxyde de zirconium ou oxyde de zirconium(IV) couramment appelée zircone est un composé inorganique du zirconium de formule ZrO2. Ce matériau est une céramique technique d'aspect opaque. Appelé CZ (Cubic Zirconia) lorsque transparent, il est utilisé pour imiter le diamant. Il ne faut pas le confondre avec le zircon (ZrSiO4). Sous sa forme tétragonale, l'oxyde de zirconium est un matériau a vocation mécanique, cette évolution cristallographique lui confère une dureté très élevée (1200Hv) ainsi qu'une bonne résistance aux sollicitations mécaniques (700Mpa en traction et 2000Mpa en compression). Une fois polie, la zircone tétragonale peut atteindre un Ra de 0,02, ce qui permet de l'utiliser pour des pièces de frottement. Index. décimale : 667.9 Revêtements et enduits Résumé : Hydroxyl acrylate emulsion was prepared firstly by the semicontinuous seeded emulsion polymerization, and then adding polyaniline (PANI)/Cu/ZrO2 ternary nanocomposites, two-component waterborne polyurethane (2 K WPU) composite coatings with antistatic and antibacterial properties were obtained by mixing the emulsion with hydrophilic modified polyisocyanate. The structure and morphology of the PANI/Cu/ZrO2 were observed by Fourier transform infrared spectroscopy, scanning electron microscopy, and X-ray diffractometer. The thermal, antistatic, antibacterial, anticorrosion, and mechanical properties of the 2 K WPU composite coatings were determined. The results showed that the addition of the ternary nanocomposites increased the antistatic, antibacterial, anticorrosion, and mechanical properties of the 2 K WPU coating. The initial decomposition temperature increased from 200 to 225°C, and the tensile strength increased by 44.4%. The coatings still maintained good impact strength of 50/50 kg cm, adhesion of grade 2, flexibility of 1 mm, pendulum hardness of 293 s, and the gloss (60°) of 119.4. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of PANI/Cu and PANI/Cu/ZrO 2 nanocomposites - Preparation of hydroxyl acrylate emulsion - Preparation of 2 K WPU film - Preparation of antibacterial and antistatic - 2 K WPU coatings - Preparation of culture medium - Characterization - Determination of surface electric resistance - Qualitative antibacterial test - Quantitatively antibacterial test - Coating anticorrosion resistance testing - Tinplate surface analysis - Adhesion, pendulum hardness, impact resistance, and gloss of films testing - Mechanical properties test - RESULTS AND DISCUSSION : FTIR - SEM images - XRD - Thermogravimetric analysis (TGA) - Antistatic property - Antibacterial property - Anticorrosion performance of the composite coatings - Coating performance of 2 K WPU composite - Table 1 : Effect of PANI/Cu/ZrO2 content on film performance of 2 K WPU DOI : https://doi.org/10.1007/s11998-022-00708-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00708-9.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39434 [article]

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Use of caffeine-containing MIL-100 (Fe) metal organic framework as a high-performance smart anticorrosion coating to protect stainless steel in 3.5 wt% NaCl solution / Zahra Akhavan-Bahabadi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 883-898 Titre : Use of caffeine-containing MIL-100 (Fe) metal organic framework as a high-performance smart anticorrosion coating to protect stainless steel in 3.5 wt% NaCl solution Type de document : texte imprimé Auteurs : Zahra Akhavan-Bahabadi, Auteur ; Hamid R. Zare, Auteur ; Zahra Mohammadpour, Auteur Année de publication : 2023 Article en page(s) : p. 883-898 Note générale : Bibliogr. Langues : Américain (ame) Catégories : 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. Caféine Composés organométalliques Electrochimie Encapsulation Matériaux intelligents Métaux -- Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, caffeine-loaded MIL-100 (Fe), caffeine@MIL-100 (Fe), was used as a smart corrosion-inhibiting coating to protect 308L-16 stainless steel (308L-16 SS). For this purpose, a thin film of the smart anticorrosion caffeine@MIL-100 (Fe) coating was deposited on an 308L-16 SS surface using a decanoic acid self-assembled monolayer. A significant encapsulation efficiency for caffeine loading in the MIL-100 (Fe) metal organic framework was obtained as 17.8%. The experimental data indicated that the caffeine@MIL-100 (Fe) coating would release the caffeine very rapidly as the solution became acidified around the corrosion sites and formed a protective layer to prevent from penetrating solution into the substrate. The EIS results and the Tafel plots showed that the proposed smart coating has an excellent performance to protect 308L-16 SS from corrosion in saline media. Based on the results, decreasing the solution pH would cause the MIL-100 (Fe) framework to decompose and subsequently release caffeine at the 308L-16 SS surface. Note de contenu : - EXPERIMENTAL : Materials and instruments - Preparation of MIL-100 (Fe) - Preparation of caffeine@MIL-100 (Fe) microcapsules - Deposition of MIL-100 (Fe) and caffeine@MIL-100 (Fe) coatings on the 308L-16 SS - RESULTS AND DISCUSSION : Characterization - Optimization of the time required to coat a MOF thin film on decanoic acid SAM-modified 308L-16 SS - Electrochemical study of the caffeine@MIL-100 (Fe) coating in a 3.5 wt% NaCl solution - Table 1 : Corrosion parameters derived from the Tafel plots for the bare 308L-16 SS, MIL-100 (Fe), and caffeine@ MIL-100 (Fe) after immersion in the 3.5 wt% NaCl solution for 1, 24, 72, and 168 h - Table 2 : Corrosion parameters derived from the EIS plots for the bare 308L-16 SS, MIL-100 (Fe), and caffeine@MIL-100 (Fe) after immersion in the 3.5 wt% NaCl solution for 1, 24, 72, and 168 h DOI : https://doi.org/10.1007/s11998-022-00709-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00709-8.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39435 [article]

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Laser diffraction measurements of pigment size distributions of coatings and mill bases: implications of dilution medium and dispersion process parameters / Shicong Luo in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 899-917 Titre : Laser diffraction measurements of pigment size distributions of coatings and mill bases: implications of dilution medium and dispersion process parameters Type de document : texte imprimé Auteurs : Shicong Luo, Auteur ; Claus Erik Weinell, Auteur ; Søren Kiil, Auteur Année de publication : 2023 Article en page(s) : p. 899-917 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Broyeurs à billes Dioxyde de titane Dispersions et suspensions Formulation (Génie chimique) Granulométrie laser Microscopie Oxyde de cuivre Pigments Polyacryliques Qualité -- Contrôle Index. décimale : 667.9 Revêtements et enduits Résumé : Coating properties, such as gloss, rheology, and exterior durability, are strongly affected by the particle size distribution (PSD) of pigment agglomerates. Consequently, moving from the industrial practice of a maximum agglomerate size evaluation after dispersion (i.e., grindometer readings) to an accurate measurement of the entire PSD, holds a promising potential for quality control, product optimization, and research. The aim of the present work was to develop an analysis procedure, based on laser diffraction, for PSD measurements of coatings. In the experiments, acrylic-based TiO2 or Cu2O predispersions (i.e., mill bases), with variations in the composition and dispersion parameters, were investigated. Results show that the laser diffraction measurements are influenced by the so-called obscuration value of the diluted sample, the equipment-input refractive index values, and the shape assumption for the pigment agglomerates. Furthermore, the unavoidable sample dilution, prior to a measurement, strongly affects the stability of primary particles and agglomerates. When using a mixture of the pertinent binder and solvent, as opposed to the pure solvent only, and taking rheology issues into consideration, solvent shock was avoided and reliable PSDs could be obtained. The new analytical procedure was used on selected dispersions with variations in coating formulations and equipment operational parameters and allowed for precise detections of the developments in PSDs and volume-moment mean diameters. In summary, the principle of laser diffraction, with proper control of the measurement conditions, was demonstrated to be a reliable technique for PSD evaluation of coatings and predispersions. Note de contenu : - EXPERIMENTAL : Raw materials - Predispersion systems investigated - Dispersion instruments - Laser diffraction particle size analyzer - Scanning electron microscope (SEM) - Digital microscope - Fineness of grind gauge - RESULTS AND DISCUSSION : Pigment size measurements with digital microscopy - Pigment size measurements with electron microscopy - Sensitivity analysis of the user-supplied parameters for the laser diffraction method - Particle shape - Comparison between grind gauge and laser diffraction - PSD measurements of TiO2 - Absence of reagglomeration - Effects on the PSD results of formulation and operational parameters - PSD results of Cu2O obtained using the laser diffraction method - Table 1 : Overview of particle size measuring techniques - Table 2 : Details of pigments used in the experiments - Table 3 : Formulation details of predispersions - Table 4 : Recommended parameters for the laboratory scale high-speed disk disperser - Table 5 : Selected (present investigation) and recommended parameter values for the lab-scale, high-speed bead mill - Table 6 : Details of beads used in the lab-scale, high-speed bead mill - Table 7 : Equivalent spherical diameter of pigment powders, measured using STEM and subsequent image analysis supported by a python code - Table 8 : Volume-moment mean diameter of TiO2-HS1 sample for four obscuration values DOI : https://doi.org/10.1007/s11998-022-00742-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00742-7.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39436 [article]

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The effect of glass transition temperature of commercial epoxy-amine coatings on their performance in marine environment / Muhammad Ahsan Bashir ; Heng Li ; Vivian B. Farstad in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 919-933 Titre : The effect of glass transition temperature of commercial epoxy-amine coatings on their performance in marine environment Type de document : texte imprimé Auteurs : Muhammad Ahsan Bashir, Auteur ; Heng Li, Auteur ; Vivian B. Farstad, Auteur Année de publication : 2023 Article en page(s) : p. 919-933 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse mécanique dynamique Calorimétrie Epoxy amine Milieu marin Revêtements organiques Test d'immersion Index. décimale : 667.9 Revêtements et enduits Résumé : Glass transition temperature (Tg) of the commercial epoxy–amine marine coatings is among the most important thermo-mechanical properties which determine the performance of the individual coat and the whole coating system. Ingress of (sea) water and temperature are known to have an influence on the Tg of model epoxy–amine coatings. This work shows the use of thermal analysis techniques like temperature-modulated differential scanning calorimetry (MDSC) and dynamic mechanical analysis (DMA) to study the effect of water immersion and immersion temperature on the Tg of four different commercial epoxy–amine coatings. In addition, Fourier transform infrared (FTIR) spectroscopy was used to study the chemical changes that occurred in the epoxy–amine network upon immersion in water at 40 and 60°C. The results obtained clearly show that the Tg is significantly influenced by water and water immersion temperature if the Tg (or the Tg region) of the epoxy–amine coating is lower than the immersion temperature. FTIR results showed that chemical changes can happen in the epoxy–amine network upon water immersion. Practical example of the effect of Tg of coatings on their protective performance has been demonstrated by using the NACE TM-0174 standard’s equipment which showed that the low Tg epoxy–amine coatings will lose their protective properties earlier than the high Tg coatings when exposed to similar test conditions. Note de contenu : - Table 1 : Tg and mixing ratio of the different commercial products used in this work - Table 2 : Comparison of Tgs of four products measured by using reversing heat flow (rev HF), total heat flow (total HF) in MDSC with the Tg estimated from peak of loss modulus (E″) and peak of tan δ - Table 3 : Comparison of Tg of reference sample and the samples taken from different places on NACE cell panels exposed to 65°C for 15 days DOI : https://doi.org/10.1007/s11998-022-00712-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00712-z.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39437 [article]

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Silica aerogel-encapsulated biocide crystals for low-loading antifouling coatings : rheology, water absorption, hardness, and biofouling protection / Tenna Frydenberg in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 935-947 Titre : Silica aerogel-encapsulated biocide crystals for low-loading antifouling coatings : rheology, water absorption, hardness, and biofouling protection Type de document : texte imprimé Auteurs : Tenna Frydenberg, Auteur ; Claus Erik Weinell, Auteur ; Kim Dam-Johansen, Auteur ; Eva Wallström, Auteur ; Søren Kiil, Auteur Année de publication : 2023 Article en page(s) : p. 935-947 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aérogels Caractérisation Encapsulation Formulation (Génie chimique) Humidité -- Absorption:Eau -- Absorption Pyrithione de cuivre Résistance à la salissure Revêtements antisalissures Rhéologie 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 : To protect surfaces against marine biofouling, the continuous leaching of biocides, such as cuprous oxide (Cu2O) and copper pyrithione (CuPT), from antifouling coatings is a widespread and effective method. However, from an environmental and economic perspective (costs of raw materials), a high biocide loading of formulations is not sustainable. Silica aerogel-encapsulated CuPT is a promising approach to reduce Cu2O and CuPT loadings without compromising the mechanical properties and antifouling performance of the coating. In the present study, silica aerogels, with varying CuPT loadings, were incorporated into model coating formulations, and selected coating properties, i.e., rheology, water absorption, and hardness, were measured and evaluated. Furthermore, to demonstrate antifouling performance, static exposure testing with the aerogel-containing coatings was performed. The level of CuPT loading of the silica aerogels did not have a significant influence on neither the water absorption nor the rheology of the coating. However, an increase in the CuPT loading of the aerogel from 0 to 80 wt% reduced the coating’s pendulum hardness from 61 to 37 s. Additionally, compared to a reference coating with nonencapsulated CuPT, results demonstrate that a coating containing silica aerogel-encapsulated CuPT provides a 17% higher antifouling resistance when evaluated according to guidance from The European Chemicals Agency. Note de contenu : - EXPERIMENTAL : Materials - Preparation of coating samples - Coating characterization - Water absorption - Static panel exposure - Fouling evaluation - RESULTS AND DISCUSSION : The influence of aerogels on selected coating properties - Static panel exposure test - Table 1 : Silica aerogels, used for coating formulation, with varying copper pyrithione (CuPT) concentrations - Table 2 : Composition and formulation parameters of model coatings used to investigate the influence of aerogels on film properties - Table 3 : Composition and formulation parameters of coatings used for static panel exposure test - Table 4 : ECHA guidance, (a) fouling coverage is evaluated in percentage and each interval is given a rating (1–4), (b) the type of fouling is divided into four fouling categories, each fouling category is given a weighted coverage rating, (c) the overall efficacy is categorized based on calculated fouling resistanceTable 5 Viscosities of model coatings containing 2 wt% of various aerogels measured at shear rates of 0.5 and 6 s−1 DOI : https://doi.org/10.1007/s11998-022-00713-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00713-y.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39438 [article]

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Coffee/polydimethylsiloxane composite coating for preventing marine biofouling / Limei Tian in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 949-955 Titre : Coffee/polydimethylsiloxane composite coating for preventing marine biofouling Type de document : texte imprimé Auteurs : Limei Tian, Auteur ; Jianfu Wang, Auteur ; Yue Yin, Auteur ; Wei Bing, Auteur ; Wenbo Du, Auteur ; Huichao Jin, Auteur Année de publication : 2023 Article en page(s) : p. 949-955 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anti-algues Antibactériens Café et constituants Caractérisation Enrobage (technologie) Essais (technologie) 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. Revêtements antisalissures Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Marine biofouling is a major issue in the marine industry. Traditional antifouling coatings have been banned worldwide due to their toxicity to nontarget organisms. Herein, we reported a polydimethylsiloxane (PDMS) coating with coffee as antifoulants. In the study, two coffee/PDMS composite coatings with 5 and 10% weight coffee were prepared, and pristine PDMS was selected as the control. In the early stage of biofouling, the settlement of microalgae and bacteria is crucial for the biofilm formation; thus, the Chlorella and bacteria Paracoccus pantotrophus (P. pantotrophus) were employed as the fouling models in the antifouling tests. In the antialgal test, both coffee/PDMS coatings exhibited excellent antialgal capability, while pristine PDMS was covered with many algal cells. In the antibacterial test, both coffee coatings showed better antifouling capability than the pristine PDMS, and the 10% coffee coating showed the best antifouling capability. A further study revealed that the coffee could inhibit the growth of P. pantotrophus in the liquid environment. According to the immersion and antibacterial tests, it could be concluded that the coffee coatings released coffee to surroundings to prevent biofouling. Overall, the 10% coffee/PDMS coating is a good choice for preventing marine biofouling, but the coffee leaching may be a barrier for long-term use. Note de contenu : - MATERIALS AND METHODS : Materials - Pretreatment of coffee - Fabrication of coffee/PDMS (CP) coatings - Characterization of CP coatings - Antialgal assays - Antibacterial assays - Weight loss tests - RESULTS AND DISCUSSION : Characterization - Antifouling assays DOI : https://doi.org/10.1007/s11998-022-00714-x En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00714-x.pdf?pdf=button Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39439 [article]

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Production and application of biochar in a UV radiation-curable epoxy paint as a substitute for graphite / Júlio Marchesini in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 957-971 Titre : Production and application of biochar in a UV radiation-curable epoxy paint as a substitute for graphite Type de document : texte imprimé Auteurs : Júlio Marchesini, Auteur ; Daniele Perondi, Auteur ; Marcos Vinícius Marocco, Auteur ; Valéria Grabas Pellizzoni, Auteur ; Gustavo Onzi Carberlon, Auteur ; Marcelo Godinho, Auteur ; Diego Piazza, Auteur Année de publication : 2023 Article en page(s) : p. 957-971 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact Biochar Le biochar est un amendement du sol issu de la pyrolyse de biomasse. Il est utilisé en agriculture pour augmenter la qualité des sols, et donc leur productivité ; il est également utilisé dans la lutte contre le réchauffement climatique comme solution de séquestration à long terme de carbone atmosphérique dans les sols. Le biochar se différencie du charbon de bois par son utilisation (comme intrant plutôt que comme combustible) et donc par son impact environnemental (il agit comme un puits de carbone plutôt que de libérer du CO2 dans l'atmosphère lors de la combustion). Caractérisation Déchets industriels -- Recyclage Epoxydes Essai Wolff-Wilborn Essais de brouillard salin Graphite Photoréticulation Production Revêtements -- Séchage sous rayonnement ultraviolet:Peinture -- Séchage sous rayonnement ultraviolet Index. décimale : 667.9 Revêtements et enduits Résumé : Research on the use of sustainable fillers which promote improvements in the paints has been reported over the years. The present study investigated the production and characterization of a biochar produced from Pinus elliottii for application in an epoxy paint cured by ultraviolet radiation, comparing it with graphite, in proportions of 12.5 and 20 wt%. The Pinus elliottii sample was initially ground, and then submitted to physical and morphological characterization by field emission scanning electron microscopy (SEM) and X-ray diffraction (XRD). Later, the Pinus elliottii sample was subjected to pyrolysis at a temperature of 1050°C at a low heating rate (5°C/min). Biochar and graphite were separately incorporated into an epoxy UV-curable paint. The painted samples had their thickness measured and their mechanical and physical properties evaluated, namely gloss, hardness, bending, impact, contact angle with water, and exposure to salt spray. Biochar and graphite promoted a reduction in gloss and improved pencil hardness when incorporated into a UV-curable epoxy paint. In the salt spray resistance test, samples containing both biochar and graphite showed a slight delay in the beginning of the corrosion process. However, samples with biochar behaved better than samples with graphite in terms of blistering of the film in the incision region. Note de contenu : - MATERIALS AND METHODS - RESULTS AND DISCUSSION : Biochar production - Characterization of biochar and graphite - Characterization of UV-curable paints - Table 1 : Nomenclature and composition of the paint samples produced - Table 2 : Results of specific surface area and pore distribution of biochar - Table 3 : Gloss measurement results of cured paint samples - Table 4 : Pencil hardness test results - Table 5 : Contact angle test results - Table 6 : Salt spray test results DOI : https://doi.org/10.1007/s11998-022-00715-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00715-w.pdf?pdf=button% [...] Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39440 [article]

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Covalent immobilization of xylanase and lysing complex into polymer scaffolds with long-term activity retention / Ryan W. Baker-Branstetter in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 973-978 Titre : Covalent immobilization of xylanase and lysing complex into polymer scaffolds with long-term activity retention Type de document : texte imprimé Auteurs : Ryan W. Baker-Branstetter, Auteur ; Mairead E. Bartlett, Auteur ; Scott A. Shuler, Auteur ; Reid E. Messersmith, Auteur Année de publication : 2023 Article en page(s) : p. 973-978 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie click Complexe de lyse Hydrolyse enzymatique Revêtements antisalissures Xylanase Index. décimale : 667.9 Revêtements et enduits Résumé : Existing antifouling coatings for marine environments rely on the toxicity of copper and small-molecule additives to prevent organism growth. These come with a myriad of environmental and health-related risks, as these additives inevitably leach into seawater. Enzyme-based antifouling polymers have tremendous potential as part of an environmentally innocuous antifouling strategy, but have not yet been commercially realized. Biofouling begins with small molecules and polymers that initiate settlement for larger organisms. Using an enzymatic coating to rapidly hydrolyze these compounds could reduce the surface concentration of these attractive polymers and prevent organism growth. Here, antifouling xylanase and lysing complex enzymes were covalently tethered to surfaces using isoindolinone groups and click chemistry. We found that xylanase and lysing complex continue to hydrolyze xylosidic bonds in hemicellulose polysaccharides after covalent tethering, and the coating maintained activities of >  80% and  >  50%, respectively, after 2 months while submerged in artificial seawater, demonstrating this material’s potential as an eco-friendly antifouling coating. Note de contenu : - General - Alkyne-Azide mixture - OPA linker solution - Enzyme assays DOI : https://doi.org/10.1007/s11998-022-00717-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00717-8.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39441 [article]

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Enhancing antibacterial and anticorrosion properties of 304 stainless steel surfaces: a multi-modification approach based on DA/PEI/SiO2/AMPs / De Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 979-994 Titre : Enhancing antibacterial and anticorrosion properties of 304 stainless steel surfaces: a multi-modification approach based on DA/PEI/SiO2/AMPs Type de document : texte imprimé Auteurs : De Liu, Auteur ; Huming Wang, Auteur ; Xuxu Dong, Auteur ; Xiaodan Liu, Auteur ; Sergi Dosta, Auteur ; Chao Zhang, Auteur ; Pan Cao, Auteur Année de publication : 2023 Article en page(s) : p. 979-994 Note générale : Bibliogr. Langues : Américain (ame) Catégories : 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. Antibactériens Anticorrosifs Anticorrosion Dioxyde de silicium Dopamine Matériaux hybrides Métaux -- Revêtements protecteurs Peptides Polyéther imide Revêtements antisalissures Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Marine fouling can cause a series of hazards in the marine industrial field, and the traditional antifouling methods do not fulfill the green antifouling requirement. Herein, a novel DA/PEI/SiO2/antibacterial peptide antifouling coating was prepared by a multi-modification approach. Initially, the nanocoatings were prepared by depositing DA, PEI, and SiO2 on the dopamine (DA)-modified 304 stainless steel (SS) surface, and finally, the DA/PEI/SiO2/AMPs composite coatings were prepared by grafting antimicrobial peptides (AMPs). The surfaces of SS before and after modification were characterized by Fourier transform infrared spectrometer (FTIR), X-ray photoelectron spectrometer (XPS), field emission scanning electron microscopy (SEM), contact angle measurement, and 3D optical profilometer. SSN-1 cells were used to evaluate the cytocompatibility of the modified surface. The results revealed that the cells cultured on the modified surface still maintained a good adhesion morphology, demonstrating the superior cytocompatibility of the composite coating. The anti-biofilm and antimicrobial properties of the modified samples were evaluated using Vibrio natriegens. The antibacterial efficiency of SS-DA/PEI/SiO2 surfaces before and after AMPs modification reached 78.39 and 95.90%, and anti-biofilm efficiency of AMPs modified surface achieved 72.87% corresponding to 44.19% of SS-DA/PEI/SiO2. The successful grafting of AMPs improved the antibacterial and anti-biofilm properties of the modified sample surfaces. Electrochemical and stability tests indicated that the modified sample surfaces exhibited excellent corrosion resistance and antifouling stability properties. This research could provide a novel green anti-fouling and anti-corrosion strategy for the marine industry and other related fields. Note de contenu : - EXPERIMENTAL SECTION : Materials and reagents - Preparation of SS-DA/PEI/SiO2-M composite surfaces - Surface characterization - Antibiofilm evaluation - Antibacterial testing - Electrochemical performance tests - Cell adhesion assays - Robustness analysis - Statistical analysis - RESULTS AND DISCUSSION : Fabrication of nanocomposite films and MAG II grafting - Characterization of SS, SS-DA/PEI/SiO2, and SS-DA/PEI/SiO2-M - Anti-biofilm and antibacterial performance assessment - Corrosion resistance analysis - Cell adhesion assays - Robustness analysis - Table 1 : XPS quantitative analysis results - Table 2 : Analyzed parameters of Tafel plots of SS, SS-DA/PEI/SiO2, and SS-DA/PEI/SiO2-M after exposure to V. natriegens inoculation medium for 1, 3, and 7 days DOI : https://doi.org/10.1007/s11998-022-00718-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00718-7.pdf?pdf=button Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39442 [article]

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Anticorrosive properties of the double-layer PANI-(graphene oxide)/epoxy coating in protecting carbon steel in saltwater / Ahmad Diraki in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 995-1006 Titre : Anticorrosive properties of the double-layer PANI-(graphene oxide)/epoxy coating in protecting carbon steel in saltwater Type de document : texte imprimé Auteurs : Ahmad Diraki, Auteur ; Sasha Omanovic, Auteur Année de publication : 2023 Article en page(s) : p. 995-1006 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier au carbone Anticorrosifs Anticorrosion Caractérisation Electrochimie Epoxydes Métaux -- Revêtements protecteurs Oxyde de graphène Polyaniline Revêtements multicouches Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : The work reports result in improving the anticorrosive properties of a commercial epoxy coating by forming a double-layer coating structure. First, a thin (ca. 5 μm) electrically conductive polyaniline (PANI) coating was wormed directly on the carbon steel (CS) surface, on top of which a thicker (ca. 20 μm) epoxy coating was applied. The inner PANI layer was also loaded with graphene oxide (GO). The resulting anticorrosive properties of the coatings were investigated in 3.5 wt.% NaCl employing electrochemical techniques, while the surface and cross-sectional morphology of the coatings was examined by scanning electron microscopy (SEM). The results showed that the commercial epoxy coating started gradually failing several days after its exposure to the electrolyte, while it took 37 days for larger pores to appear in the PANI/epoxy coating, which then gradually continued to fail. On the other hand, the PANI-GO/epoxy coating maintained its high corrosion resistance, without forming impedance-detectable pores, over the entire testing period (two months). The excellent corrosion protection properties of the PANI-GO/epoxy coating were prescribed solely to the presence of the underlying PANI-GO layer, which represents a better barrier for the transport of hydrated corrosive ions to the CS surface, through the combined action of charge (repulsion of hydrated corrosive anions and iron oxide film formation), surface energy (hydrophobicity), and blocking mechanisms. Note de contenu : - EXPERIMENTAL : Materials - Instrumentation - Sample preparation - Preparation of the coatings - Corrosion measurements - Surface characterization - RESULTS AND DISCUSSION : Physical characterization of the coatings - Anticorrosive properties of the coatings-electrochemical measurements - Long-term corrosion study - Table 1 : Technical characteristics of the profilometer - Table 2 : Corrosion current determined from Tafel measurements recorded on the naked (unprotected) CS surface and the CS surface protected by the three coatings - Table 3 : EEC parameter values obtained by modelling the EIS spectra presented in Fig. 5 DOI : https://doi.org/10.1007/s11998-022-00719-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00719-6.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39443 [article]

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Development of corrosion-resistant epoxy coating by hydrophobically surface-modified halloysite nanotubes using trimethylchlorosilane and 1,1,1,3,3,3-hexamethyldisilazane / NamKyu Lee in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 1007-1018 Titre : Development of corrosion-resistant epoxy coating by hydrophobically surface-modified halloysite nanotubes using trimethylchlorosilane and 1,1,1,3,3,3-hexamethyldisilazane Type de document : texte imprimé Auteurs : NamKyu Lee, Auteur ; UiSeo Kim, Auteur ; MinYoung Shon, Auteur Année de publication : 2023 Article en page(s) : p. 1007-1018 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Enrobage (technologie) Epoxydes Halloysite L'halloysite-7Å est une espèce minérale du groupe des silicates sous-groupe des phyllosilicates de formule Al2Si2O5(OH)4 avec des traces de : Ti ; Ca ; Na ; K ; Fe ; Cr ; Mg ; Ni ; Cu. Ses principaux constituants, outre l'oxygène, sont l’aluminium (20,90 %), le silicium (21,76 %), et l’hydrogène (1,56 %). Hydrophobie Nanotubes Revêtements -- Analyse Revêtements organiques Spectroscopie d'impédance électrochimique Traîtements de surface Index. décimale : 667.9 Revêtements et enduits Résumé : Herein, surface modification of halloysite nanotubes (HNTs) was conducted to enhance hydrophobicity via piranha etching and treatment with trimethylchlorosilane (TMCS) and 1,1,1,3,3,3-hexamethyldisilazane (HMDS). The surface-modified HNTs (m-HNTs) were added to the epoxy coating, and the corrosion protection performance was evaluated in terms of the mixing ratio. The m-HNTs were characterized by Fourier transform IR spectroscopy, X-ray photoelectron spectroscopy, and field emission transmission electron spectroscopy. The addition of m-HNTs to the epoxy coating led to an improvement in its barrier and adhesion properties. In addition, electrochemical impedance spectroscopy was conducted to evaluate the corrosion protection performance of the epoxy coating with different mixing ratios. Corrosion protection performance was successfully improved by an increase in m-HNTs. The results were in accordance with those of the barrier and adhesion properties. Note de contenu : - MATERIALS AND METHODS : Materials and surface modification of HNTs - Preparation of epoxy coating - Surface analysis of m-HNTs - Epoxy coating with HNTs and analysis of m-HNTs - RESULTS AND DISCUSSION : Analysis results of hydrophobic surface modification of HNTs - Analysis of epoxy coating with HNTs and m-HNTs DOI : https://doi.org/10.1007/s11998-022-00720-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00720-z.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39444 [article]

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A parameterized deposition rate model of electrostatic spraying rotating bell atomizer / Peilun Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 1019-1037 Titre : A parameterized deposition rate model of electrostatic spraying rotating bell atomizer Type de document : texte imprimé Auteurs : Peilun Zhang, Auteur ; Weiguo Gao, Auteur ; Chen Zhao, Auteur ; Xuhao Wang, Auteur ; Xiangzhi Meng, Auteur Année de publication : 2023 Article en page(s) : p. 1019-1037 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Atomiseurs Automobiles -- Revêtements Cloche rotative Primaire (revêtement) Pulvérisation électrostatique Revêtements:Peinture Système de projection Index. décimale : 667.9 Revêtements et enduits Résumé : Compared with spray gun painting, electrostatic spraying rotating bell (ESRB) painting can provide better film-forming quality and higher adhesion rate, which is more suitable for automobile base coating. However, the complexity of the spray pattern of the ESRB and the automobile surface geometric makes the spray process planning a more challenging problem. This paper aims to provide a new parameterized model of the ESRB to facilitate the thickness calculation and trajectory planning in the off-line painting programming. Firstly, according to the distribution characteristics of paint particles and the force analysis of adhesion process, a new static deposition rate model—offset asymmetric Gaussian model is proposed on the plane. The parameters in the new model have intuitive practical significance and can fully reflect the characteristics of ESRB coating deposition rate. Then based on the analysis of the relationship between the static model and uniform linear spraying deposition, the static model is established by measuring the layer data of corresponding uniform linear spraying. In order to further simulate the paint thickness on curved surfaces, the projection model with variable spraying distance and deposition point normal deflection is also deduced. Finally, a parameterized static model and sampling points library are established which provide efficient and accurate prediction of static deposition result, and is more suitable for off-line programming. Three different groups of simulation proved that the proposed static deposition rate model has high calculation accuracy for different working conditions and fast simulation speed for different spraying parameters. Note de contenu : - EXPERIMENT - DEPOSITION RATE MODEL OF ESRB : ESRB static deposition rate model - Uniform spraying thickness and static model calculation - ESRB static model curved surface projection - ESRB static model parameter library - VERIFICATION : Universality verification of the static deposition rate model of ESRB - Surface projection model - Parameterized model - Table 1 : Parameters of ESRB spraying - Table 2 : Parameters of ESRB static model at different heights - Table 3 : Value range and reference value of ESRB spraying parameters - Table 4 : DURR EcoBell3 Cx atomizer technical data - Table 5 : Parametric verification experiment DOI : https://doi.org/10.1007/s11998-022-00721-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00721-y.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39445 [article]

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Investigating the correlation between the curing behavior and properties of acrylic powder coatings / Da Eun Lee in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 1039-1052 Titre : Investigating the correlation between the curing behavior and properties of acrylic powder coatings Type de document : texte imprimé Auteurs : Da Eun Lee, Auteur ; Jae Jun Lee, Auteur ; Han-Jung Cho, Auteur ; Jin Seok Lee, Auteur Année de publication : 2023 Article en page(s) : p. 1039-1052 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Calorimétrie Essais (technologie) Polyacryliques Réticulation (polymérisation) Revêtements organiques Revêtements poudre Index. décimale : 667.9 Revêtements et enduits Résumé : Acrylic powder coatings are environmentally friendly, solvent-free solid coatings with excellent durability and corrosion resistance that protect substrates from corrosive environments. The curing behavior of acrylic powder coatings affects the coating film properties. In this study, a catalyst was used to control the curing conversion rate, and the curing characteristics and physical properties were compared for coatings with and without the catalyst. Differential scanning calorimetry and an isoconversional method were used to obtain activation energies, and the conversion rate under different isothermal conditions was computed. Notably, complete curing could not be achieved without the catalyst; however, the catalyst-containing coating was entirely cured. With sufficient curing established, the addition of the catalyst was found to increase the adhesion, impact resistance, and corrosion resistance. However, the recoatability was reduced owing to a lack of unreacted monomers on the surface of the catalyst-containing coating film, as verified by Fourier-transform infrared spectroscopy. In general, the addition of a catalyst to acrylic powder coatings enabled complete curing and enhanced most physical properties, offering an improved formulation for applications across high-corrosion environments. Note de contenu : - EXPERIMENTAL METHODS : Sample preparation - Differential scanning calorimetry measurements - Property evaluation - RESULTS AND DISCUSSION : Curing characteristics of acrylic powder coating - Property test results - Table 1 : Composition and content of acrylic powder coating - Table 2 : Adhesion grades - Table 3 : Activation energies, curing times, and glass transition temperatures for various degrees of conversion - Table 4 : Kinetic parameters in the autocatalytic model Property test results - Table 5 Property testing results DOI : https://doi.org/10.1007/s11998-022-00722-x En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00722-x.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39446 [article]

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Electrochemical, spectroscopic and microscopic investigation of PEDOT coated nickel plate from aqueous micellar solutions and its anti-corrosion performances / Z. Aouzal in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 1053-1068 Titre : Electrochemical, spectroscopic and microscopic investigation of PEDOT coated nickel plate from aqueous micellar solutions and its anti-corrosion performances Type de document : texte imprimé Auteurs : Z. Aouzal, Auteur ; M. Bouabdallaoui, Auteur ; A. El Guerraf, Auteur ; S. Ben Jadi, Auteur ; M. Bazzaoui, Auteur ; R. Wang, Auteur ; E. A. Bazzaoui, Auteur Année de publication : 2023 Article en page(s) : p. 1053-1068 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale Anticorrosifs Anticorrosion Caractérisation Electrochimie Electrode de nickel Electropolymérisation Essais de résilience Microscopie Poly(3,4-éthylènedioxythiophène) Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Poly(3,4-ethylenedioxythiophene) (PEDOT) was electrosynthesized on nickel electrodes from aqueous micellar solutions of sodium dodecylbenzenesulfonate (SDBS) containing sodium saccharin or sodium perchlorate as supporting electrolytes. The choice of the aqueous medium for the preparation of PEDOT is mainly dictated by its relevant interest on the economic and ecological fronts. The electrodeposition of the organic coating was achieved using cyclic voltammetry, chronoamperometry and chronopotentiometry. This latter electrochemical method proved to be the most suited to the preparation of homogeneous and adherent PEDOT films. Elsewhere, the presence of SDBS micelles in the electrolytic medium led to an improvement of the monomer solubility and a notable decrease in its oxidation potential. Furthermore, spectroscopic and microscopic characterization techniques revealed regular and compact nodule-like structure of the coating and proved the increase in its doping rate when increasing the electrosynthesis current density. On the other hand, in order to discuss the potential application of the prepared conducting polymer as protective layer against corrosion, several electrochemical tests were performed, using open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) methods. OCP curves have shown a slight increase in the potential toward more positive values, while the EIS measurements have given a 90° capacitive line indicating the pure capacitive behavior of the polymeric system and have proven the presence of a fast charge transfer at the metal/polymer and polymer/solution interfaces. Note de contenu : - EXPERIMENTAL : Chemicals - Electrochemical apparatus - Characterization techniques - RESULTS AND DISCUSSION : Preparation of the polymeric coating - Characterization of PEDOT films - Corrosion tests DOI : https://doi.org/10.1007/s11998-022-00724-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00724-9.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39447 [article]

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Multinozzle electrospray method for high-throughput and uniform coating : Application of superhydrophobic coating / Md. Abu Mosa in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 1069-1081 Titre : Multinozzle electrospray method for high-throughput and uniform coating : Application of superhydrophobic coating Type de document : texte imprimé Auteurs : Md. Abu Mosa, Auteur ; Se Hyun Kim, Auteur ; Kye-Si Kwon, Auteur Année de publication : 2023 Article en page(s) : p. 1069-1081 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Buse (tuyère) Caractérisation Dépôt par pulvérisation Diaphonie Electronébulisation Epoxydes Hydrophobie Nanoparticules Pulvérisation électrostatique Revêtement -- Séchage Revêtements organiques 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 : Electrospraying is an effective method of producing functional layers on substrates. By means of electrospraying, it is possible to create uniform and fine droplets that attract to the substrate without being blown away by the electric field formed by the nozzle and the substrate. The uniformity of the coated layer is rarely affected by a fluid drying process (such as Marangoni flow on substrates) as the size of droplets can reach micron/nano-levels and the solvents in the droplets can evaporate quickly. Therefore, the electrospray process is often referred to as ‘dry deposition.’ However, when an electrospray system with multinozzles is considered for the faster process of producing large substrates, the drying process may be completely different than for a single-nozzle system. In addition, crosstalk and nonuniform spray volume from each nozzle can pose an additional problem that needs to be addressed. In this study, we proposed a multinozzle electrospray system and process to average the spray amount heterogeneity and achieve layer uniformity in a fast-drying process. Finally, we demonstrated the effectiveness of our proposed methods by fabricating superhydrophobic layers on a highly insulating substrate. Note de contenu : - MATERIALS AND METHODS : Materials - Experimental process - Characterization of deposited layers - Reliability test - RESULTS AND DISCUSSION : Atomization process in electrospray deposition - Crosstalk and end effects - Uniform deposition method based on motion control - Drying optimization for uniform layer thickness - Characterization of the deposited layer Table 1 : Temperature of the PCB substrate at various heating levels (temperature at the outlet of the hot blower) and wind speeds measured with the FLIR camera DOI : https://doi.org/10.1007/s11998-022-00725-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00725-8.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39448 [article]

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Development of bio-based polyester-urethane-acrylate (PUA) from citric acid for UV-curable coatings / Debarati Maity in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 1083-1097 Titre : Development of bio-based polyester-urethane-acrylate (PUA) from citric acid for UV-curable coatings Type de document : texte imprimé Auteurs : Debarati Maity, Auteur ; Rahul Tade, Auteur ; Anagha S. Sabnis, Auteur Année de publication : 2023 Article en page(s) : p. 1083-1097 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biopolymères Bois -- Revêtements protecteurs Caractérisation Chimie analytique Citrique, Acide L'acide citrique est un acide alpha hydroxylé de formule C6H8O7. Il joue un rôle central dans le métabolisme de tous les organismes vivants et tient son nom de son origine; le citron. L'acide citrique est biodégradable et n'est pas toxique pour l'homme ni pour l'environnement. Cependant, comme tout acide, il est irritant et peut provoquer des brûlures s'il entre en contact prolongé avec des muqueuses. À pH physiologique, il est présent sous forme de sa base conjuguée, le citrate, qui est un chélateur de l'ion calcium dans le sang. Copolymère uréthane acrylate Polyesters Polymères -- Synthèse Polymères ramifiés Polyols Revêtements -- Séchage sous rayonnement ultraviolet Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : A novel UV-curable hyperbranched polyester-urethane-acrylate (PUA) resin was successfully synthesized using citric acid as a core bio-based material and ester-urethane-acrylate linkage as the arm and was applied on both wood and metal substrates. Citric acid was employed as a functionality-enhancing bio-based monomer for coating applications. This resin (PUA) was synthesized from citric acid (CA)-based polyester-polyol (CAP) and subsequently reacted with isophorone diisocyanate (IPDI) and end-capped with 2-hydroxyethylmethacrylate (HEMA) to form a tetra-functional acrylate precursor (UCAP). Fourier-transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance spectroscopy (1H-NMR) and gel permeation chromatography (GPC) were used to characterize the citric acid-based polyester-urethane-acrylate (UCAP). This oligomer was formulated with a reactive diluent and a photoinitiator (UCAP PUA), applied on both wood and metal substrates and cured under UV-radiation. The mechanical, chemical and thermal properties of the coated substrates were investigated and compared to a commercial urethane acrylate (CUA). The mechanical properties such as crosscut adhesion, pencil hardness, impact strength and flexibility showed comparable results. Even though the chemical resistance and free film properties of the synthesized urethane acrylate (UCAP) were found to be inferior, the thermal properties were observed to be superior. Note de contenu : - MATERIALS AND METHODS : Raw materials and chemicals - Synthesis of citric acid-based polyester-polyol (CAP) - Synthesis of citric acid based polyester-urethane-acrylate (UCAP) - Formulation of citric acid-based polyester-urethane-acrylate (UCAP PUA) - Characterizations and instrumentations - RESULTS AND DISCUSSION : Chemical analysis - Instrumental analysis - Characterization of coated films - Table 1 : Formulations of commercial and UCAP UV oligomers - Table 2 : GPC analysis of CAP and UCAP - Table 3 : Comparative optical and mechanical properties between commercial UA and UCAP PUA coatings - Table 4 : Comparative chemical properties between commercial UA and UCAP PUA coatings - Table 5 : Comparative free film properties between commercial UA and UCAP PUA coatings - Table 6 : Comparative stain tests between commercial UA and UCAP PUA - Table 7 : Comparative TGA data of Commercial UA and UCAP PUA DOI : https://doi.org/10.1007/s11998-022-00728-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00728-5.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39449 [article]

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Optimized curing and coating of smart paints for surface temperature measurements / Ju-Hun Ahn in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 1099-1109 Titre : Optimized curing and coating of smart paints for surface temperature measurements Type de document : texte imprimé Auteurs : Ju-Hun Ahn, Auteur ; Jin Yeon Cho, Auteur ; Jeong Ho Kim, Auteur ; Chang-Yull Lee, Auteur Année de publication : 2023 Article en page(s) : p. 1099-1109 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Capteurs thermiques Matériaux céramiques Matériaux intelligents Nanoparticules Polyéthylène glycol Résistance thermique Revêtements organiques Revêtements:Peinture Surfaces (technologie) Thermométrie Titanate de baryum Le titanate de baryum, de formule BaTiO3, est un oxyde de baryum et de titane. Il cristallise dans une structure pérovskite. Découvert à la fin des années 1940, il est le premier oxyde ferroélectrique simple connu et reste aujourd'hui un matériau modèle pour l'étude de la ferroélectricité. Utilisé sous forme de céramique ou de couche mince, le titanate de baryum est très utilisé dans l'industrie pour ses propriétés diélectriques et piézoélectriques (notamment dans les thermistances CTP, les condensateurs céramiques...). Le titanate de baryum existe à l'état naturel, sous la forme du minéral bariopérovskite. (Wikipédia) Index. décimale : 667.9 Revêtements et enduits Résumé : Excess thermal energy can cause significant damage to the mechanical parts of various systems. Temperature sensors can measure and control the temperature in these systems to prevent such damage. However, the applications of existing temperature sensors are limited by their shape as it limits their ability to attach to different surfaces. Consequently, it is challenging to measure the temperature of curved surfaces. In this study, we propose a smart paint that can measure the temperature of curved surfaces to address the above issues. The smart paint fabrication method must be optimized because the resistance characteristics of these paints differ according to the manufacturing conditions. In this study, a curing process was used to manufacture the smart paint; the optimal curing temperature and curing time were determined experimentally. Furthermore, a coating solution was applied to increase the surface stability of the fabricated paint. The coating was applied using a spin coater at a specific rotation time and speed. We also determined the optimal coating conditions. The coating was confirmed to increase the surface stability of the smart paint. DOI : https://doi.org/10.1007/s11998-022-00729-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00729-4.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39450 [article]

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Preparation of modified montmorillonite/graphene oxide composites to enhance the anticorrosive performance of epoxy coatings / Quanxian Hua in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 1110-1119 Titre : Preparation of modified montmorillonite/graphene oxide composites to enhance the anticorrosive performance of epoxy coatings Type de document : texte imprimé Auteurs : Quanxian Hua, Auteur ; Ben Jing, Auteur ; Mengyuan He, Auteur ; Panfei Sun, Auteur ; Qiang Zhao, Auteur ; Shilong Su, Auteur ; Guanjie Hu, Auteur ; Songjie Li, Auteur Année de publication : 2023 Article en page(s) : p. 1110-1119 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Caractérisation Composés organiques -- Synthèse Electrochimie Epoxydes Hydrophobie Montmorillonite Oxyde de graphène Réaction de couplage Revêtements organiques Silanes Index. décimale : 667.9 Revêtements et enduits Résumé : Modified montmorillonite/graphene oxide composites (AM@GO) were prepared by a hydrothermal method with silane coupling agent-modified montmorillonite (APTES@MMT) and combined with GO. The structures of the composites were characterized by FTIR, XRD, Raman spectroscopy, BET analysis, and SEM. The results showed that the composites had increased interlayer spacing and formed a loosely laminated stacked structure. The specific surface area (31.6863 m2/g) and pore volume (0.0104 cm3/g) of the composites increased. The hydrophobic and anticorrosive properties of the composite coatings were investigated and compared to the epoxy coating. The composite coatings (AM@GO/EP) had larger contact angles and smoother surfaces than the epoxy coating (EP). After 30 days of immersion, the value of |Z|0.01 Hz was approximately 1011 Ω cm2, which had changed slightly since initial immersion. Mechanistic analysis shows that the improved corrosion resistance of the composite coatings was due to the high specific surface area of the 2D material, the oxygen-containing groups of GO, the amino groups of APTES@MMT and the synergy between the MMT and the GO nanosheets. Note de contenu : - Materials - Synthesis of APTES@MMT(AM) - Synthesis of GO - Synthesis of AM@GO - Epoxy composite coating preparation - Electrochemical measurements - Structural characterization - Table 1 : Impedance values of different types of coatings under different immersion days DOI : https://doi.org/10.1007/s11998-022-00731-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00731-w.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39451 [article]

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The preparation and study of functionalized graphene oxide/self-healing waterborne polyurethane composites / Zhiqiang Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 1121-1132 Titre : The preparation and study of functionalized graphene oxide/self-healing waterborne polyurethane composites Type de document : texte imprimé Auteurs : Zhiqiang Li, Auteur ; Zhaoyang Zhang, Auteur ; Shouxiang Liu, Auteur ; Yang Qiao, Auteur ; Yanyan Wei, Auteur Année de publication : 2023 Article en page(s) : p. 1121-1132 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale Angle de contact Caractérisation Diels-Alder, Réaction de La réaction de Diels-Alder est une réaction chimique utilisée en chimie organique, dans laquelle un alcène (diénophile) s'additionne à un diène conjugué pour former un dérivé du cyclohexène. Otto Diels et Kurt Alder reçurent le prix Nobel de chimie en 1950 pour les travaux relatifs à cette réaction. Dans le domaine des matériaux avancés et de la robotique souple on parle de "Polymères Diels-Alder" ("Diels-Alder polymers") pour décrire des polymères constitués de réseaux covalents thermoréversibles. (Wikipedia) Humidité -- Absorption:Eau -- Absorption Matériaux -- Propriétés fonctionnelles Oxyde de graphène Polyuréthanes Réaction de couplage Revêtements -- Propriétés mécaniques Revêtements en phase aqueuse Revêtements organiques Silanes Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, silane coupling agent KH560-FA containing furan groups was synthesized to modify the surface of graphene oxide, and maleimide group-capped waterborne polyurethane was synthesized at the same time. A self-healing material with a microcrosslinking network structure based on polymer/modified graphene oxide was synthesized by Diels–Alder (DA) reaction. The materials obtained can control the formation and fracture of DA chemical bonds under thermal stimulation and repair the damage macroscopically. With the addition of modified graphene oxide from 0 wt% to 0.4 wt%, the tensile strength of the material increased from 3.59 MPa to 15.27 MPa, the repair efficiency reached a maximum of 89.19%, the water contact angle increased from 61° to 77°, and the water absorption decreased from 10.52% to 3.40%. The addition of modified graphene oxide significantly improved the hydrophobicity and mechanical properties of the material. When the addition of KH560-FA-GO was 0.4 wt%, the corrosion resistance of the coating prepared by the emulsion was remarkably improved in deionized water, 5% sodium chloride solution, and 5% sulfuric acid solution. It showed the application potential of materials in the field of coatings. Note de contenu : - EXPERIMENTAL : Materials - Preparation of KH560-FA - Preparation of KH560-FA-modified graphene oxide - Preparation of KH560-FA-GO-modified waterborne polyurethane - CHARACTERIZATIONS - RESULTS AND DISCUSSION : Nuclear magnetic hydrogen spectrum - Infrared spectra of GO and KH560-FA-GO - Infrared spectra of waterborne polyurethane modified by KH560-FA-GO - RAMAN - XPS : Mechanical properties and self-healing properties - Analysis of mechanical properties and self-healing properties - Cross-sectional topography of composites with different KH560-FA-GO content - Water contact angle test - Water resistance test - Corrosion resistance - Table 1 : hxWPU with different proportions of KH560-FA-GO - Table 2 : Record of mechanical properties of WPU with different proportions of modified GO - Table 3 : Water absorption of self-healing WPU with different KH560-FA-GO contents - Table 4 : The surface condition of coatings with different KH560-FA-GO contents in different solutions on the third and ninth day DOI : https://doi.org/10.1007/s11998-022-00732-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00732-9.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39452 [article]

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Polydopamine-AgNPs coated acrylic fabric for antimicrobial and antioxidant textiles / Esam S. Allehyani in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 1133-1143 Titre : Polydopamine-AgNPs coated acrylic fabric for antimicrobial and antioxidant textiles Type de document : texte imprimé Auteurs : Esam S. Allehyani, Auteur ; Yaaser Q. Almulaiky, Auteur ; Sami A. Al-Harbi, Auteur ; Reda M. El-Shishtawy, Auteur Année de publication : 2023 Article en page(s) : p. 1133-1143 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Amidoximation Antimicrobiens Antioxydants Argent Enduction textile Nanoparticules Polyacryliques Polydopamine Résistance à la traction Revêtements -- Propriétés mécaniques Revêtements organiques Surfaces fonctionnelles Textiles et tissus à usages médicaux Textiles et tissus synthétiques Index. décimale : 667.9 Revêtements et enduits Résumé : There is an increase in public awareness of functional textiles, which strive to produce innovative fabrics for specific applications. In this context, acrylic polymer, a significant synthetic fabric used in the textile industry, was selected to provide it with multifunctional characteristics. For this purpose, the acrylic fabric was functionalized with amidoxime groups to serve as ligands for immobilizing silver ions so that it can be further in situ reduced to AgNPs. Polydopamine (PDA) has the advantage of being an ion binding and reducing agent by virtue of its phenolic hydroxyl groups capable of reducing silver ions to AgNPs, and it was exploited in this study for imparting the acrylic fabric with antimicrobial and antioxidant properties. Additionally, glucose as a reducing agent was also used to form AgNPs-loaded amidoximated acrylic fabric. The pristine, amidoximated, PDA-coated AgNPs-loaded amidoximated, and AgNPs-loaded amidoximated acrylic fabrics have been characterized using ATR-FTIR, SEM, EDX, and tensile strength. All fabric samples were assessed as antioxidants using DPPH and FRAP assays. Antimicrobial properties against Pseudomonas Aeruginosa, Staphylococcus aureus, Escherichia coli and Candida albicans were also evaluated using broth assay. An almost complete killing (99.99%) of the pathogenic Gram-negative Escherichia coli was achieved using PDA-coated AgNPs-loaded amidoximated acrylic fabric. The overall results indicated that the composite nanocoating using PDA-AgNPs showed good tensile strength and excellent antioxidant and antimicrobial properties to suggest the viability of PDA-AgNPs coating of fabrics for possible application as biomedical textiles. Note de contenu : - EXPERIMENTAL : Materials - Methods - RESULTS AND DISCUSSION : Synthesis - SEM–EDX analysis - ATR-FTIR - Tensile strength - Antioxidant activity - Antimicrobial properties - Table 1 : ATR-FTIR characteristic absorption peaks of amidoximated acrylic fabrics before and after coating with PDA and AgNPs - Table 2 : Antimicrobial efficacies of different acrylic fabrics - Table 3 : Survival bacterial count versus time DOI : https://doi.org/10.1007/s11998-022-00711-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00711-0.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39453 [article]

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Corrosion protection ability of hydrophobic zinc based coordination polymers on mild steel surface in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 1145-1155 Titre : Corrosion protection ability of hydrophobic zinc based coordination polymers on mild steel surface Type de document : texte imprimé Année de publication : 2023 Article en page(s) : p. 1145-1155 Note générale : Bibliogr. Langues : Américain (ame) Catégories : 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. Angle de contact Anticorrosifs Anticorrosion composés de coordination Corrosion -- Analyse Diffractométrie de rayons X Fourier, Spectroscopie infrarouge à transformée de Hydrophobie Métaux -- Revêtements protecteurs Morphologie (matériaux) Polyfluorure de vinylidène Polymères -- Synthèse Revêtements organiques Zinc Index. décimale : 667.9 Revêtements et enduits Résumé : A series of Zn2+ based hydrophobic coordination polymers (CPs) have been synthesized by varying methylene spacers length (m = 1 to m = 6) of aliphatic dicarboxylic acids followed by reaction with the zinc acetate by using hydrothermal method. The synthesized CPs were coated on the mild steel (MS) specimens to investigate the effect of methylene spacers length of dicarboxylic acids on hydrophobicity and corrosion behavior. The synthesized CPs and their coatings on MS have been characterized by various instrumental techniques such as Fourier transform infrared (FTIR) spectroscopy, powder X-ray diffraction (PXRD), Field Emission Scanning Electron Microscopy (FE-SEM), water contact angle (WCA) measurements. FTIR and PXRD measurements confirm the formation of CPs whereas the FE-SEM images of suberic acid polymer (SUAP) reveal compact distribution of sphere-like aggregates. WCA measurements showed that the bare MS including CPs coatings on MS up to methylene spacers length m = 4 is hydrophilic in nature; however, the coating of longest methylene spacers length CP (SUAP, m = 6) showed hydrophobic nature with water contact angle of ~ 108.6°. Furthermore, the obtained hydrophobic SUAP CP with polyvinylidene fluoride (PVDF) as binder was coated on MS to study its anticorrosion behavior for the protection of MS. The anticorrosion performance of the developed SUAP coating was investigated by open-circuit potential (OCP) and potentiodynamic polarization techniques. The corrosion rate has been calculated from potentiodynamic polarization curves for the bare MS and SUAP coated MS showed significant improvement in the anticorrosion behavior of the developed SUAP coating. Note de contenu : - EXPERIMENTAL PROCEDURE : Materials and method - Synthesis of coordination polymers - Coatings - Corrosion study - RESULTS AND DISCUSSION : Designing of coordination polymers - FTIR analysis - Morphology - Powder X-ray diffraction analysis - Contact angle - Corrosion studies - Table 1 : The composition used for preparation of coatings - Table 2 : Potentiodynamic polarization parameters for bare mild steel (MS), and coated MS specimens in 3.5 wt.% NaCl DOI : https://doi.org/10.1007/s11998-022-00734-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00734-7.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39454 [article]

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