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One-dimensional structured fillers as novel carriers for self-healing coatings : a comprehensive review / Hanhai Dong in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1173-1201 Titre : One-dimensional structured fillers as novel carriers for self-healing coatings : a comprehensive review Type de document : texte imprimé Auteurs : Hanhai Dong, Auteur ; Shanda Wang, Auteur ; Ke Yang, Auteur ; Yanru Chen, Auteur Année de publication : 2024 Article en page(s) : p. 1173-1201 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adsorption Cellulose La cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules. Charges (matériaux) Effet mémoire de forme Electrofilature Encapsulation Fibres creuses Fibres de verre 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 %). Matériaux -- Propriétés fonctionnelles Matériaux autoréparants Nanoparticules Nanotubes Polymères Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : One-dimensional structured fillers play a crucial role in promoting the rapid and spontaneous healing of defects induced by damage in self-healing coatings. This innovative type of self-healing coating prevents the substrate material from corroding, thereby significantly extending its service life. The modification of self-healing coatings with one-dimensional structured fillers relies on functional additives to efficiently heal coating damage, distinguishing it from traditional approaches involving microcapsules and nanoencapsulated particles. The incorporation of advanced fillers not only enhances the local reconstruction efficiency and mechanical properties of the coating but also enables the coating to heal the damage repeatedly. In this paper, the latest research progress on one-dimensional structured fillers for self-healing coatings is reviewed from three aspects: types of functional fillers with one-dimensional structures, packaging processes for repairing agents in fillers, and self-healing mechanisms of the composite coating. Furthermore, future work has been proposed to address present problems in the research of one-dimensional structured filler-modified self-healing coatings. Note de contenu : - TYPES OF FUNCTIONAL FILLERS WITH ONE-DIMENSIONAL STRUCTURES : Hollow glass fibers - Halloysite nanotubes - Core–shell polymer fibers - Nanocelluloses - Carbon nanotubes - Inorganic nanotubes - Shape memory polymers - Polymer internal cavities - PACKAGING PROCESSES FOR REPAIRING AGENTS IN ONE-DIMENSIONAL STRUCTURED FILLERS : Vacuum infiltration treatment - Surface adsorption - Electrospinning technology - Coaxial solution blowing - SELF-HEALING MECHANISMS OF THE COMPOSITE COATING Local damage healing : Substrate corrosion inhibition - Induced coating healing - Water-swelling filling - Multifunctional collaborative healing - Table 1 : Application of core-shell polymer fibers in self-healing coatings DOI : https://doi.org/10.1007/s11998-024-00911-w En ligne : https://drive.google.com/file/d/1zlUDEh_s6uhRtIG8KNIbjm5F1bBtB5It/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41290 [article]

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Hydrophilicity-hydrophobicity adjustable polymer-modified surfaces from one-step dip-coating method / Xing Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1203-1215 Titre : Hydrophilicity-hydrophobicity adjustable polymer-modified surfaces from one-step dip-coating method Type de document : texte imprimé Auteurs : Xing Liu, Auteur ; Jiliang Zhang, Auteur ; Mochou Liu, Auteur ; Xia Han, Auteur ; Honglai Liu, Auteur Année de publication : 2024 Article en page(s) : p. 1203-1215 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymères Copolymères -- Synthèse Dip-coating Equilibre hydrophile-hydrophobe Mouillabilité Mouillage (chimie des surfaces) Revêtements antisalissures:Peinture antisalissures Revêtements organiques Séparation huile/eau Index. décimale : 667.9 Revêtements et enduits Résumé : The wettability feature is a fundamental and crucial property of solid surfaces which can be easily obtained and adjusted by polymer surface treatment thanks to the wide range of properties of polymers and feasible processing methods. In this study, a simple method was developed to modify the surface of materials using amphiphilic copolymers with zwitterionic groups. Random copolymers poly(dopamine methacrylamide-co-2-(dimethylamino)ethyl methacrylate-co-sulfobetaine methacrylate) (P(DMA-co-DMAEMA-co-SBMA), PDDS) were synthesized by a “one-pot polymerization” method and successfully grafted onto the surface of the substrate by “dip-coating”. As the composition of the copolymer can be easily changed, four copolymers with fixed adhesive DMA content and various SBMA contents were obtained where the hydrophilic-hydrophobic balance can be adjusted. The more hydrophobic the copolymer is, the denser and smoother the copolymer coating on silica surface will be obtained. Thus, the wettability of the copolymer modified surface can be controlled by the synergistic effect of adjusting the composition and surface morphology of the copolymer coatings. At the microscopic level, increasing the proportion of SBMA monomer could significantly enhance the hydrophilicity of the coatings, thereby decreasing the adhesive force between modified surface and colloidal probe and improving the antifouling performance of the modified surfaces. At the macroscopic level, owing to their hydrophilicity and underwater superoleophobicity, both PD5D20S75-mesh and PD5S95-mesh exhibited excellent oil/water separation performances with separation efficiency of 97.2% and 98.8%, and water flux of 40692 and 1528 L m−2 h−1, respectively. These results provide a reference for the development of hydrophilic surface materials in different applications. Note de contenu : - EXPERIMENTAL SECTION : Materials - Synthesis of P(DMA-co-DMAEMA-co-SBMA) copolymers - Surface modification - Characterizations - RESULTS AND DISCUSSION : Synthesis of random copolymers - Surface wettability and antifouling performance of copolymer modified substrates - Table 1 : Surface properties of copolymer coatings on silicon wafer Oil-water separation performance of modified stainless steel mesh DOI : https://doi.org/10.1007/s11998-023-00883-3 En ligne : https://drive.google.com/file/d/1VJTv7ARC6e4KKwTWXbQvSA1ZOlsfIAba/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41291 [article]

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Biodegradable surfactants do not improve antifouling or fouling-release performance of polydimethylsiloxane / Emmerson R. Wilson in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1217-1229 Titre : Biodegradable surfactants do not improve antifouling or fouling-release performance of polydimethylsiloxane Type de document : texte imprimé Auteurs : Emmerson R. Wilson, Auteur ; Katerina Basque, Auteur ; Meaghan MacDonald, Auteur ; Amelia F. MacKenzie, Auteur ; Michelle Hodgson, Auteur ; Robin Stuart, Auteur ; Truis Smith-Palmer, Auteur ; Russell C. Wyeth, Auteur Année de publication : 2024 Article en page(s) : p. 1217-1229 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aquaculture Biosurfactants 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 : Surfaces that combine low-toxicity antifouling effects with fouling-release properties are an intriguing possibility for developing effective measures against marine biofouling. This study field tested siloxane-based fouling-release surfaces enhanced by adding biodegradable surfactants. Two different surfactants were added to a standard polydimethylsiloxane (PDMS) surface, as well as to PDMS soaked in silicone oil, and compared to controls without surfactant augmentation. Antifouling and fouling-release performance was assessed over 11 to 13 weeks against the most prominent fouling species at three locations in Cape Breton, Nova Scotia, Canada. Using nonlinear mixed effect analysis, surfactants were found to have little impact on the progression of biofouling on PDMS without silicone oil in all three sites and had no additional impact on the progression of biofouling on PDMS augmented with silicone oil. (Silicone oil was found to delay biofouling in PDMS without other additives.) Given the known toxicity of some surfactants to invertebrate larvae, future efforts should consider either higher concentrations or alternative varieties for incorporation into fouling-release surfaces. Note de contenu : - MATERIALS AND METHODS : Treatments - Contact angles - Experiment - Measurement of percent cover - Statistical analysis of percent cover - Measurement and statistical analysis of removal times - Software - RESULTS : Percent cover - Removal time - Contact angles DOI : https://doi.org/10.1007/s11998-023-00884-2 En ligne : https://drive.google.com/file/d/1pxkh9EdpR9LVAIlixjfdmAaR9BDhfLOt/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41292 [article]

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Unraveling the influencing mechanism of water ingress on the adhesion behavior of poly(dimethylsiloxane)-silica interface : a molecular dynamic study / Chuanjing Zhuang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1231-1240 Titre : Unraveling the influencing mechanism of water ingress on the adhesion behavior of poly(dimethylsiloxane)-silica interface : a molecular dynamic study Type de document : texte imprimé Auteurs : Chuanjing Zhuang, Auteur ; Chuanxu Zhang, Auteur ; Liang Liu, Auteur ; Haifeng Wang, Auteur ; Jun Liu, Auteur ; Xiaojie Du, Auteur ; Jia Cheng, Auteur ; Wen Li, Auteur Année de publication : 2024 Article en page(s) : p. 1231-1240 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Charges (matériaux) Mouillabilité Nanoparticules 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 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. Simulation par ordinateur Index. décimale : 667.9 Revêtements et enduits Résumé : Water ingress in nanofiller reinforced polymer nanocomposite is usually considered as one of the causes for the interfacial failure between nanofiller and nanocomposite. However, the molecular mechanism for the effects of water on the interfacial adhesion behavior has rarely been studied. In this work, atomic scale interfacial adhesion behavior of silica nanoparticles reinforced poly(dimethylsiloxane) (PDMS) matrix was studied by using molecular dynamics (MD) simulations. Moreover, the influences of silica wettability and terminal groups of PDMS molecules on their interfacial adhesion behavior were also investigated. The results show that the hydrophilic silica has stronger interfacial adhesion force in PDMS matrix with hydroxyl terminated PDMS molecules due to the strong interfacial van der Waals, electrostatic and hydrogen bonds interactions. After water ingress, the invaded water can be adsorbed at the interface and weaken the adhesion strength, especially for the hydroxyl modified silica system. As for the PDMS system with hydroxyl terminated groups, the invaded water molecules are inclined to transport in the PDMS matrix instead of adsorb at the interface. This work provides a new method to investigate the interfacial adhesion behavior of nanofillers in resin matrix at molecular level by using MD simulations, and also proposes some principles to obtain stronger adhesion strength of nanofillers in polymer matrix by tuning their hydrophilicity according to the application environment. Note de contenu : - MODEL AND SIMULATION DETAILS : Model systems - Simulation details - RESULTS AND DISCUSSION : The structures and dynamics of silica-PDMS interface - The influences of water ingress on the adhesion behavior of PDMS molecules on silica substrates DOI : https://doi.org/10.1007/s11998-023-00886-0 En ligne : https://drive.google.com/file/d/1CgVf3o4T7_NBSHvBzzGX-J_y6PSWncw1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41293 [article]

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Tuning the mechanical properties of epoxy-acrylate core-shell nanostructured film via epoxy concentration in the core layer / Eyann Lee in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1241-1254 Titre : Tuning the mechanical properties of epoxy-acrylate core-shell nanostructured film via epoxy concentration in the core layer Type de document : texte imprimé Auteurs : Eyann Lee, Auteur ; Zulkifli Mohamad Ariff, Auteur ; Mohamad Danial Shafiq, Auteur ; Raa Khimi Shuib, Auteur ; Muhamad Sharan Musa, Auteur Année de publication : 2024 Article en page(s) : p. 1241-1254 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois -- Revêtements Caractérisation Copolymère époxy acrylate Couches minces Nanoparticules Nanostructures Polymérisation en émulsion Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Epoxy-acrylate (EA) core–shell nanoparticles have gained significant attention recently due to their dual unique properties as heterogeneous materials, particularly in coating applications. However, the effect of epoxy (EP) concentration in core layer on mechanical properties is still limited, and the mechanism of how it affects the film's performance is not well understood. In this study, we investigate the effect of varying EP concentration in the core layer on the mechanical properties of nanostructured films containing EA core–shell nanoparticles. The core–shell nanoparticles were synthesized through multistage seeded emulsion polymerization. The transmission electron microscopy (TEM) images revealed similar particle morphology and size in all EA nanoparticles. Differential scanning calorimetry (DSC) analysis confirmed the successful synthesis of core–shell particle morphology with two glass transition temperature (Tg) values (~12 °C and ~ 60 °C) observed for the core and shell layers, respectively. We observed an increase in the Tg values of the shell layer with higher EP content in the core layer. The use of EP-based copolymers raised the Tg values of the shell layer, significantly affecting the film formation behavior and their mechanical properties through interlayer crosslinking. Tensile modulus values for the films ranged from 200 to 500 MPa, marking the highest modulus reported for cast films of EA nanostructured films. Our findings reveal a straightforward and versatile method for producing high-modulus EA nanostructured films with customizable mechanical properties, making the model ideal for enhancing wood coating performance. Note de contenu : - EXPERIMENTAL : Materials - Preparation of polyacrylate seed nanoparticles - Preparation of WEA core-shell nanoparticles - Preparation of EA nanostructured film - Characterizations - RESULTS AND DISCUSSION : Particle's physical properties and morphology - Fourier transform infrared spectroscopy - Interlayer crosslinking mechanism - Film appearance and formation mechanism - Glass transition temperature and thermal stability - Tensile properties - Hardness and adhesion strength - Hydrophilicity and water uptake - Shelf-life stability test DOI : https://doi.org/10.1007/s11998-023-00888-y En ligne : https://drive.google.com/file/d/1nQYW3cAQkWLTs4iWjaqLtxSSASQ9fZTQ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41294 [article]

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Dual-responsive wettability of poly o-toluidine nanofiber coating fabricated by interfacial polymerization / Xianghui Xu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1255-1262 Titre : Dual-responsive wettability of poly o-toluidine nanofiber coating fabricated by interfacial polymerization Type de document : texte imprimé Auteurs : Xianghui Xu, Auteur ; Zuo Hansong, Auteur ; Xiaoyan Zhou, Auteur ; Weiwei Wei, Auteur ; Yongqing Cao, Auteur Année de publication : 2024 Article en page(s) : p. 1255-1262 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Electrochimie Hydrophilie Hydrophobie Mouillabilité Nanofibres Poly o-toluidine Polymérisation interfaciale Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : To date, smart surfaces with controllable wettability have received extraordinary attention due to their great importance in both fundamental research and practical applications. Chemical composition and surface topography are the two key factors to affect the wettability of solid surfaces. Applying external stimuli to change the surface chemistry and/or topography is considered to be a valuable approach for driving the transition between hydrophilicity and hydrophobicity of surfaces. In this study, poly o-toluidine nanofibers were synthesized by a facile aqueous/organic interfacial polymerization, and superhydrophobic coatings of poly o-toluidine were prepared via a room-temperature spraying process. The reversible wettability conversion between the superhydrophobic and the hydrophilic state of the obtained poly o-toluidine coating under ultraviolet irradiation and electric stimulation was investigated. From the X-ray photoelectron spectroscopy analysis, this intelligent switching wetting behavior under ultraviolet light irradiation was confirmed to have a high correlation with the change in surface chemical composition. When the electric stimulation was applied, the wettability switch was caused by the redistribution of charge and electric dipole along the liquid–solid interface. Note de contenu : - EXPERIMENTAL : Materials - Interfacial polymerization of poly o-toluidine - Fabrication of POT coatings - Dual-responsive wettability of POT coating - Characterization - RESULTS AND DISCUSSION : Interfacial polymerization of POT - Photo-responsive wettability of POT coating - Electrically-responsive wettability of POT coating DOI : https://doi.org/10.1007/s11998-023-00889-x En ligne : https://drive.google.com/file/d/1Secnl7KpGB9JaUg92Y-HWOZCBclXylRT/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41295 [article]

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Preparation of active-passive anticorrosion antistatic epoxy nanocomposite coatings loaded with CeO2, CeO2@C, and CHS particles / Sara Sabzavar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1263-1279 Titre : Preparation of active-passive anticorrosion antistatic epoxy nanocomposite coatings loaded with CeO2, CeO2@C, and CHS particles Type de document : texte imprimé Auteurs : Sara Sabzavar, Auteur ; Mehdi Ghahari, Auteur ; Mehran Rostami, Auteur ; Morteza Ganjaee Sari, Auteur Année de publication : 2024 Article en page(s) : p. 1263-1279 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Antistatiques Caractérisation Carbone Epoxydes Matériaux hybrides Nanoparticules -- Synthèse Oxyde de cérium Polyvinylpyrrolidone Revêtements organiques Sphères creuses Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, active-passive anticorrosion antistatic epoxy composite coatings containing CeO2, carbon coated ceria (CeO2@C), and carbon hollow sphere particles were prepared. Cerium oxide (CeO2) particles were synthesized through a hydrothermal approach in the presence of polyvinylpyrrolidone as a surfactant to achieve a uniform and semispherical morphology and to improve dispersion stability. Carbon hollow spheres (CHSs) were also fabricated using the surface-modified silica templating method. The structure and morphology of the synthesized particles were analyzed using Fourier transform infrared spectrometry, X-ray diffractometry, Raman spectrometry, and scanning electron microscopy–energy-dispersive X-ray spectroscopy (SEM-EDS). Furthermore, migration of the synthesized particles from the bulk toward the surface was investigated with atomic force microscopy, Raman spectra, and field emission SEM in addition to density, capillary wetting, contact angle, and zeta potential measurements. The results indicated that CHSs migrate toward the surface of the matrix due to its low interfacial tensions leading to a decline in the dielectric constant and electrical resistance, providing a composite with suitable antistatic properties. Moreover, electrochemical impedance spectroscopy and immersion testing were used to estimate the influence of the particles on the coating's anticorrosive property. The results showed that the impedance modulus at low frequency (|Z|0.01 Hz) significantly increased from 3.81 × 106 Ω cm2 (pristine epoxy) to 11 × 108 Ω cm2 after 40 days of immersion in 3.5% NaCl water solution. As a result of the synergistic protection provided by ceria, CHS, and CeO2@C particles, composite coatings exhibit superior anticorrosion properties. The ceria particles have an inhibitory effect which forms a passive layer. Furthermore, the CHS and CeO2@C particles produce a protective barrier prolonging the penetration pathway of corrosive media. Such significant improvements can provide an antistatic coating for designing novel corrosion protection coatings. Note de contenu : - EXPERIMENTAL : Materials - Hydrothermal synthesis of CeO2 particles - Encapsulation of corrosion inhibitors - Synthesis of carbon hollow spheres - Preparation of coatings - Characterization techniques - RESULTS AND DISCUSSION : Characterization of the synthesized nanoparticles - Investigation of migration of the nanoparticles in the coatings - Zeta potential - Raman spectrometry - Atomic force microscopy (AFM) - Contact angle measurement - FESEM microscopic images - Corrosion studies - Antistatic properties of coatings DOI : https://doi.org/10.1007/s11998-023-00890-4 En ligne : https://drive.google.com/file/d/1X435yvjEaQ9Dy8IN3dQKwIsHMDvs-24E/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41296 [article]

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Simulation analysis of the start-up process of Carreau-type fluid slot die coating / Shaofei Pan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1281-1289 Titre : Simulation analysis of the start-up process of Carreau-type fluid slot die coating Type de document : texte imprimé Auteurs : Shaofei Pan, Auteur ; Yikun Wei, Auteur ; Jianneng Chen, Auteur ; Chuanyu Wu, Auteur ; Jiangming Jia, Auteur Année de publication : 2024 Article en page(s) : p. 1281-1289 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Enduction par filière Fluides non newtoniens Modèles mathématiques Modèles numériques Revêtements Rhéologie Tags : 'Revêtement  par  matrice  à  fente'  'Processus  de  démarrage'  'Taille  du  cordon  revêtement'  'Méthode  VOF' Index. décimale : 667.9 Revêtements et enduits Résumé : The start-up process is important for ensuring the end quality of slot coating products. This study uses ANSYS Fluent to explore the start-up process of slot coating with Carreau-type non-Newtonian fluid. The relationship between the pressure change in the coating bead at the slot outlet and the stabilization process of the coating bead is analyzed, and the effects of the downstream die lip angle and downstream die lip length on the size of the coating bead are discussed. The simulation results show that the pressure at the slot outlet directly affects the stabilization of the coating bead, and accelerating the coating bead stabilization pressure can accelerate the start-up process. When other parameters remain unchanged, reducing the downstream die lip angle or length can reduce the size of the coating bead, thereby accelerating the start-up process. Numerical model and method Governing equations Computational domain and boundary conditions. Note de contenu : - NUMERICAL MODEL AND METHOD : Governing equations - Computational domain and boundary conditions - Numerical method - Grid independence and model validation - RESULTS AND DISCUSSION : Analysis of the coating bead development process - Analysis of the downstream die lip angle - Analysis of the downstream die lip length - Table 1 : The physical parameters of the coating fluid - Table 2 : Geometric parameters shown shown in Fig. 1 - Table 3 : Effects of two variables on coating bead size DOI : https://doi.org/10.1007/s11998-023-00891-3 En ligne : https://drive.google.com/file/d/19Xbdb3SFl87OF9QGADWtSz3jhJK544PL/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41297 [article]

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Inclusion complex-based multifunctional polyurethane antibacterial coatings with excellent mechanical and thermal properties / Anjali Sharma in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1291-1309 Titre : Inclusion complex-based multifunctional polyurethane antibacterial coatings with excellent mechanical and thermal properties Type de document : texte imprimé Auteurs : Anjali Sharma, Auteur ; Indu Pal Kaur, Auteur ; Fengge Gao, Auteur ; Gaurav Verma, Auteur Année de publication : 2024 Article en page(s) : p. 1291-1309 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens B-cyclodextrine sulfonée Caractérisation Charges (matériaux) Nanoparticules Polyuréthanes Revêtements -- Propriétés mécaniques Revêtements -- Propriétés thermiques Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Sulfonated β-cyclodextrin (CD1) combined with nanocurcumin or nanoclay was used to prepare multifunctional polyurethane (PU) coatings having antimicrobial capabilities. The combination resulted in formation of an inclusion complex which is confirmed by Raman studies and Job's plot analysis. The co-precipitation method is employed to achieve two inclusion complexes by combining CD1 with Cloisite 30B (C30B) and nanocurcumin (NC) separately. The resultant nanocomposite coating samples exhibit < 100 °C deviation at 50% weight loss from PU in heat resistance, as well as a 78% enhancement in toughness and 2.3–3 cm of zone of inhibition which is comparable to amoxicillin in its performance in resistance to bacterial growth. The advantage of absorbing such inclusion complexes into polymer coatings is the creation of multifunctionalities such as hydrophobicity, flame retardance, thermally stable and low intumescent coatings. Note de contenu : - Table 1 : FTIR peaks description of Na2SO3, sodiumundec-10-ene−1-sulfonate and CD1 - Table 2 : Thermal properties of PU and nanofiller-based PU nanocomposites - Table 3 : Mechanical properties of the coatings of coatings DOI : https://doi.org/10.1007/s11998-023-00892-2 En ligne : https://drive.google.com/file/d/1QYOkwhLKjSGrS9YW4jUe6KrMR_6e-x8J/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41298 [article]

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Preparation and application of fluorine-containing acrylate emulsion in two-component waterborne polyurethane coatings / Aohuan Guo in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1311-1320 Titre : Preparation and application of fluorine-containing acrylate emulsion in two-component waterborne polyurethane coatings Type de document : texte imprimé Auteurs : Aohuan Guo, Auteur ; Jianben Xu, Auteur ; Caili Yu, Auteur ; Faai Zhang, Auteur Année de publication : 2024 Article en page(s) : p. 1311-1320 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Fluoropolymères Polyacrylates Polymérisation en émulsion Polyuréthanes Résistance à l'humidité:Résistance à l'eau Revêtements -- Propriétés mécaniques Revêtements bi-composant Revêtements en phase aqueuse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Traditional two-component waterborne polyurethane (2K WPU) has low water resistance, which limits its application in the wide field. In this work, fluorine-modified 2K WPU films (2K-WFPUs) were successfully prepared using a fluorine-modified acrylate emulsion as hydroxyl component and a hydrophilically modified polyisocyanate as curing agent. Fourier transform infrared spectroscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy analysis indicate that hexafluorobutyl acrylate (HFBA) was successfully introduced into the 2K-WFPUs. The effects of HFBA content on the surface, thermal stability, water resistance, mechanical, and application properties of 2K-WFPUs were investigated. Compared with the unmodified film, with the increase in HFBA level from 0 to 8%, the static water contact angle of 2K-WFPUs increased from 66° to 92°, the surface-free energy decreased from 42.7 to 28.4 mJ m−2, the water absorption reduced from 15.9 to 9.9%. Thermogravimetric analysis shows that the thermal stabilities of 2K-WFPUs were improved remarkably. Meanwhile, adding HFBA did not weaken the impact resistance, flexibility, and adhesion of 2K-WFPUs and maintained the highest level. The fluorine-modified 2K WPU coatings have potential application in wood furniture and automotive finishing. Note de contenu : - EXPERIMENTAL : Materials - Preparation of the fluorine-containing acrylate emulsion - Preparation of 2K-WFPUs - Characterization - RESULTS AND DISCUSSION : Characterization of the emulsion - FTIR analysis - TGA analysis - DSC analysis - Surface analysis - Water resistance - Coating properties - Table 1 : Feeding monomer mixture recipe for preparation of emulsion - Table 2 : Mechanical and film properties of the 2K-WFPU coatings DOI : https://doi.org/10.1007/s11998-023-00893-1 En ligne : https://drive.google.com/file/d/1bSiVfzJh9q7RBxYlzKJWwxD3GjMFwWv_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41299 [article]

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Pistachio shell-derived carbon dots and their screen-printing formulation for anticounterfeiting applications / H. D. Chinmayi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1321-1332 Titre : Pistachio shell-derived carbon dots and their screen-printing formulation for anticounterfeiting applications Type de document : texte imprimé Auteurs : H. D. Chinmayi, Auteur ; Namratha Ullal, Auteur ; Dhanya Sunil, Auteur ; Suresh D. Kulkarni, Auteur ; P. J. Anand, Auteur ; K. Udaya Bhat, Auteur Année de publication : 2024 Article en page(s) : p. 1321-1332 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Carbone Contrefaçon -- Lutte contre Coque de pistache Encre en phase aqueuse Fluorescence Formulation (Génie chimique) Séparation (technologie) Sérigraphie Index. décimale : 667.9 Revêtements et enduits Résumé : In synergy with constructing a sustainable environment, facile reuse of carbon-rich biowastes as inexpensive precursors for the synthesis of value-added functional carbon dots (CDs) has garnered fruitful outcomes. Pistachio shells comprising cellulose, hemicellulose, and lignin were successfully utilized as a carbon source for the synthesis of CDs through carbonization and subsequent hydrothermal method. The methanolic fraction with desirable fluorescence in the visible region obtained after column purification of CDs was further characterized using TEM, EDS, SAED, FTIR, XPS, RS, XRD, and TCSPC techniques. The blue and green emitting CDs were used as colorants to prepare a water-based ink for screen printing. The screen prints on UV dull paper substrate exhibited good colorimetric and density values. The UV-induced yellow fluorescence of the ink film can be used as a security feature to authenticate genuine document/products and data storage. Note de contenu : - EXPERIMENTAL : Synthesis of CDs - Purification of CDs - Characterization of CDs - Preparation of security ink - Study of print properties - RESULTS AND DISCUSSION : Synthesis and purification of CDs - Characterization of CDs - Water-based ink formulation and study of print features - CDs incorporated formulation for security printing - Table 1 : Security ink formulation of pistachio shell-derived CDs - Table 2 : Lifetime values of CDs with their average lifetime values for different excitations and respective emissions - Table 3 : The colorimetric and densitometric values for the paper samples DOI : https://doi.org/10.1007/s11998-02667.93-00894-0 En ligne : https://drive.google.com/file/d/1MRu2ElG8wDzo_dAw4QD-AmnxP9H_DJl4/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41300 [article]

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Multifunctional polyurethane coatings with excellent antifouling and self-healing properties / Haoran Wei in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1333-1342 Titre : Multifunctional polyurethane coatings with excellent antifouling and self-healing properties Type de document : texte imprimé Auteurs : Haoran Wei, Auteur ; Henghui Liu, Auteur ; Min Li, Auteur ; Zhinan Fu, Auteur ; Liqun Liu, Auteur ; Hanjie Zhang, Auteur ; Chuanjie Fan, Auteur ; Jun Xu, Auteur ; Jie Wang, Auteur Année de publication : 2024 Article en page(s) : p. 1333-1342 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Hydrophobie Liaisons disulfures Matériaux -- Propriétés fonctionnelles Matériaux intelligents 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 Revêtement autoréparant Revêtements -- Propriétés mécaniques Revêtements -- Propriétés thermiques Revêtements antisalissures Revêtements en phase aqueuse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Polydimethylsiloxane (PDMS) has been widely used to improve the antifouling properties of polyurethane (PU) coatings due to its low surface energy. Herein, a novel type of waterborne polyurethane (WPU) coating with good antifouling and self-healing abilities was synthesized by incorporating PDMS and disulfide bonds. The effects of PDMS and the disulfide content on the thermal, mechanical and surface properties of the coatings were investigated. Benefiting from a rational structural design, the obtained WPU coating manifested superior antifouling properties. In addition, the WPU coating exhibited good healing capabilities owing to the collaboration between dynamic disulfide bonds. Interestingly, the self-healing of an experimental crack occurred at a temperature above 60°C, and the coating recovered its mechanical properties to 95%. This finding has great significance for the design of multifunctional smart coatings for diverse applications. Note de contenu : - EXPERIMENTAL : Materials - Preparation of the coating - Characterization - RESULTS AND DISCUSSION : Structural analysis - Thermal and mechanical properties - Hydrophobic property - Antifouling property - Self-healing property DOI : https://doi.org/10.1007/s11998-023-00896-y En ligne : https://drive.google.com/file/d/1SumbkTcSkqlcj9qWHVNxig5BMOvY-02V/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41301 [article]

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Wear, thermal, corrosion, and physical properties of novel UV-cured nanocomposite hybrid coatings with fluorine-containing silica networks / Mustafa Cakir in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1343-1360 Titre : Wear, thermal, corrosion, and physical properties of novel UV-cured nanocomposite hybrid coatings with fluorine-containing silica networks Type de document : texte imprimé Auteurs : Mustafa Cakir, Auteur ; Emre Akin, Auteur ; Kerim Günsay, Auteur ; Recep Artir, Auteur Année de publication : 2024 Article en page(s) : p. 1343-1360 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymère époxy acrylate Diaminodiphénylsulfone Dioxyde de silicium Fluor Matériaux hybrides Revêtements -- Séchage sous rayonnement ultraviolet Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : This paper presents novel organic-inorganic (hybrid) nanocomposite coatings (EASFs) containing a diamino diphenyl sulfone (DDS)-based structure with fluorine chains and SiO2 networks. To obtain these nanocomposites, a diamino diphenyl sulfone (DDS)-based structure (SFDDS) containing silane terminated fluorine chains was synthesized. This structure was converted to a novel precursor (SFDDS precursor) by adding hydrolyzed tetraethoxysilane (TEOS) and trimethylsiloxy propyl methacrylate (MEMO) by the sol-gel method. This way, SFDDS precursor was obtained and incorporated into a mixture of epoxy acrylate and 1,6-hexanediol diacrylate reactive resin system in the range of 2.5-15%. The prepared solutions were spread onto low-carbon steel with a 75 μm wire-wound applicator instrument and cured by UV light. These coating samples were characterized in terms of their thermal, wear, physical, and corrosion properties. Considering physical properties, while hydrophobicity and scratch resistance presented substantial increases, adhesion and brightness properties decreased. The adhesion properties of EASF10 and EASF12.5 were fairly good, but their wear resistance values showed decreases at these adhesion levels. Glass transition temperatures increased with an increase in the SFDDS precursor content. This situation showed that these novel hybrid nanocomposite coatings could have higher thermo-mechanical properties. Besides these results, the corrosion resistance values of these novel hybrid nanocomposite coating materials were noteworthy. While the corrosion resistance results of these novel coatings were enhanced substantially in the air atmosphere, the NaCl atmosphere adversely affected corrosion resistance. Note de contenu : - Materials - The synthesis - Preparation of fluorine chains and SiO2 networks containing novel hybrid nanocomposite coatings - Measurements - Table 1 : Physical properties of EASFs - Table 2 : Glass transition temperature values of EASFs - Table 3 : Taber abrasion results of EASFs - Table 4 : Comparison of the properties of the prominent DDS-based novel structure containing nanocomposite coatings (EASFs) in this study to properties reported in similar prominent studies in the literature DOI : https://doi.org/10.1007/s11998-023-00897-x En ligne : https://drive.google.com/file/d/1kiBqbPqB28yvRZhC-gpl40PMQ0wWOzsd/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41302 [article]

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Synthesis and characterization of porous TiO2 and its application in hydrophilic coatings / Zichen Wu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1361-1372 Titre : Synthesis and characterization of porous TiO2 and its application in hydrophilic coatings Type de document : texte imprimé Auteurs : Zichen Wu, Auteur ; Rui Wang, Auteur ; Dongyun Li, Auteur ; Meilin Sungao, Auteur ; Yang Xu, Auteur ; Hong Liang Ge, Auteur Année de publication : 2024 Article en page(s) : p. 1361-1372 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Colloides Dioxyde de titane Hydrophilie Matériaux poreux Polyéthylène glycol Revêtements Sol-gel, Procédé Index. décimale : 667.9 Revêtements et enduits Résumé : A sol-gel and phase separation method were employed to synthesize porous TiO2 coating materials, which were applied to two types of transparent substrates. The coating preparation process is simple, cost-effective, and allows for the adjustment of pore structures. The study investigated the impact of the microstructure, substrate, and UV light exposure on the hydrophilic properties of the TiO2 coating materials. The results indicate that the hydrophilicity of TiO2 coating materials prepared with resin as the substrate is inferior to that of similar coatings prepared with glass as the substrate. Furthermore, the hydrophilic performance of glass substrates coated with porous TiO2 is superior to those coated with dense TiO2. Glass substrates coated with porous TiO2 exhibit superhydrophilicity after 1 h of UV light exposure. The hydrophilic mechanism of the coating material surface was analyzed using surface energy theory, capillary theory, and photo-induced hydrophilic theory. Note de contenu : - Experimental : Raw materials - Preparation of TiO2 hydrophilic coating - Characterization - Results and discussion : Effect of additives on microstructure of TiO2 gel - Effect of PEG addition - Effect of citric acid - Effect of solvents : X-ray diffraction (XRD) - Fourier transform infrared (FTIR) - XPS spectra analysis - UV–Visible spectroscopy - Water contact angle DOI : https://doi.org/10.1007/s11998-023-00898-w En ligne : https://drive.google.com/file/d/1kRM4eytKPEEh7bwRDWTri9Pep_Gq0oQa/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41303 [article]

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Fabrication of superhydrophobic TA2 titanium alloy and preliminary assessment of its antifouling, self-cleaning, anti-icing, friction resistance, and corrosion resistance performance / Sian Chen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1373-1383 Titre : Fabrication of superhydrophobic TA2 titanium alloy and preliminary assessment of its antifouling, self-cleaning, anti-icing, friction resistance, and corrosion resistance performance Type de document : texte imprimé Auteurs : Sian Chen, Auteur ; Benfeng Zhu, Auteur ; Xuesheng Wang, Auteur ; Na Chen, Auteur ; Guowei Ji, Auteur ; Mengyan Liu, Auteur ; Yumeng Yang, Auteur ; Li Ren, Auteur ; Shuxin Shuai, Auteur ; Jiajun Cao, Auteur ; Li Jiang, Auteur ; Guoying Wei, Auteur Année de publication : 2024 Article en page(s) : p. 1373-1383 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alliages Anticorrosifs Anticorrosion Caractérisation Hydrophobie Matériaux -- Propriétés antisalissures Nanotubes Résistance à l'abrasion Revêtement auto-nettoyant Revêtements antigel Index. décimale : 667.9 Revêtements et enduits Résumé : Titanium alloy-based superhydrophobic surfaces have great advantages in terms of self-cleaning and corrosion resistance. To extend the application of titanium alloy, a multifunctional superhydrophobic TA2 titanium alloy was fabricated by anodic oxidation and chemical modification. Regular TiO2 nanotube arrays were obtained after anodic oxidation and completely covered by 1H,1H,2H,2H-perfluorodecyltriethoxysilane. The water contact angle of superhydrophobic TA2 titanium alloy is as high as 153.4° ± 0.6°, and the contact angle of the surface shows good stability in different pH aqueous solutions and different concentrations of NaCl solutions. At −10 °C, the icing time of superhydrophobic TA2 titanium alloy surface can be extended to 4400 s. Furthermore, the superhydrophobic TA2 titanium alloy still maintains superhydrophobic properties when polished 70 times by sandpaper, indicating that the surface has good friction resistance. Electrochemical impedance spectroscopy results show that superhydrophobic TA2 titanium alloy with a Z′|f=0.01 Hz value of 84 kΩ cm2 has better corrosion resistance compared with the TA2 titanium alloy. These results indicate that the superhydrophobic composite film integrates multiple functions on the surface of TA2 titanium alloy, which greatly expands its application. Note de contenu : - EXPERIMENTAL AND METHODS : Materials - Preparation of anodized titanium alloy nanotube arrays - Preparation of superhydrophobic titanium alloy - Characterizations - RESULTS AND DISCUSSION : ATR FTIR spectra - Surface morphology and elemental composition - Surface wettability - Self-cleaning - Anti-icing - Friction resistance - Corrosion resistance DOI : https://doi.org/10.1007/s11998-023-00900-5 En ligne : https://drive.google.com/file/d/1frqvHp1TZ3T91pjY8lUck7WHc7N1KMAS/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41304 [article]

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Bacterial decontamination of process liquids and paints in E-coating lines by pulsed electric field treatment / Christian Gusbeth in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1385-1398 Titre : Bacterial decontamination of process liquids and paints in E-coating lines by pulsed electric field treatment Type de document : texte imprimé Auteurs : Christian Gusbeth, Auteur ; Peter Krolla, Auteur ; Julia Bruchmann, Auteur ; Thomas Schwartz, Auteur ; Georg Müller, Auteur ; Wolfgang Frey, Auteur Année de publication : 2024 Article en page(s) : p. 1385-1398 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antimicrobiens Automobiles -- Revêtements:Automobiles -- Peinture Champs électriques Décontamination bactérienne Electrophorèse Index. décimale : 667.9 Revêtements et enduits Résumé : Cultivation-based and DNA-based methods for determining the bacterial load and the composition of the bacterial spectrum have been successfully established for media in electrodip painting, and used for the detailed analysis of the contamination situation in an E-coating system of an automobile plant in Germany. Dominating representatives of the genus Microbacterium spp., the orders Burkholderiales and Pseudomonadales, the family Cytophagaceae and the genera Corynebacterium spp., Sphingomonas spp., and Stenotrophomonas spp. were used for inactivation experiments. Different pulsed electric field (PEF) parameters were studied for an effective and target-directed inactivation of defined bacterial suspensions containing mixtures of Gram-positive as well as Gram-negative bacteria, but also single species suspensions in adequate liquids. PEF treatment with pulse durations longer than 1.0 µs effectively killed bacteria even in low conductivity media, regardless of whether the pulses were unipolar or bipolar, indicating that the choice of pulse shape does not limit the design of the PEF system. Model calculations showed that for efficient treatment in bypass mode, a high treatment flow rate is required rather than a high inactivation efficiency of the PEF treatment. By using specific treatment parameters, such as bipolar pulses of 50 k Vcm−1 and a treatment energy of 40 J mL−1, a significant reduction in both Gram-negative and Gram-positive bacteria (> 2 log10 reduction) can be achieved while minimizing electrode corrosion and coating degradation. PEF treatment proves to be an effective alternative to the use of biocides in an E-coating system and can help maintain a bacteriostatic environment in the system by operating at different points, in transfer flow or bypass mode, ensuring biocide-free operation. Note de contenu : - MATERIALS AND METHODS : State of the art: analysis of bacterial contamination in an automotive paint shop - Identification and cultivation of bacteria - Sampling and preparation of bacterial model suspensions - Determination of bacterial viability - PEF treatment - RESULTS AND DISCUSSION : Operation modes - Mathematical modeling to determine the required inactivation performance - Bacterial inactivation by PEF treatment - Bacterial inactivation by PEF treatment with unipolar and bipolar pulses DOI : https://doi.org/10.1007/s11998-023-00901-4 En ligne : https://drive.google.com/file/d/1mbzLsQsmDNisg6leXIekogu9UYo27x0q/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41305 [article]

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Zein-natamycin functional films with ethylene adsorption and fungi stasis for active food packaging applications / Xin Fan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1399-1407 Titre : Zein-natamycin functional films with ethylene adsorption and fungi stasis for active food packaging applications Type de document : texte imprimé Auteurs : Xin Fan, Auteur ; Ting Yang, Auteur ; Yuxin Li, Auteur ; Miaomiao Liu, Auteur ; Huan Wang, Auteur ; Lu Chang, Auteur Année de publication : 2024 Article en page(s) : p. 1399-1407 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adsorption Aliments -- Conservation Aliments -- Emballages -- Aspect sanitaire Caractérisation Couches minces Ethylène Fruits -- Revêtements protecteurs Inhibition microbienne Zéine-natamycine Index. décimale : 667.9 Revêtements et enduits Résumé : The main factors that lead to fruit spoilage are ethylene and microbial contamination. The majority of existing studies focus on single regulation tools for extending fruit shelf life, such as controlling ethylene concentration or inhibiting microbial contamination. The objective of this study was to fabricate zein–natamycin (Z-Nt) films that utilize the synergistic effect of zein and natamycin to extend the shelf life of fruits in terms of ethylene adsorption and microbial inhibition. The mechanical properties, contact angle, water vapor permeability (WVP), oxygen permeability (OP), ethylene adsorption efficiency, antimicrobial properties, and fruit preservation tests were used to characterize the performances of the Z-Nt films. As the natamycin content increased, the films presented an increase in contact angle and a decrease in WVP, indicating an increase in the hydrophobicity of the films. Furthermore, the natamycin content of the films is inversely proportional to OP and positively proportional to ethylene adsorption efficiency. The antimicrobial properties of the films were evaluated against Geotrichum candidum strain and Wickerhamomyces anomalus isolate. Inhibition of mold growth was observed for all natamycin-containing films. Thus, in the case of bananas, the film has a significant mitigating effect on the browning rate, weight loss rate, and hardness of bananas within a certain storage period. It can therefore be concluded that the film, as a bio-based material, has good application value for extending the shelf life of fruits and improving their storage quality. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of the zein–natamycin (Z-Nt) films - Characterization of the Z-Nt films - Ethylene adsorption properties - Fluorescence intensity - Antifungal properties -Application Z-Nt film on bananas preservation - Statistical analysis - RESULTS AND DISCUSSION : Water contact angle (WCA) - Water vapor permeability (WVP) and oxygen permeability (OP) - Mechanical properties - Ethylene adsorption efficiency - Antimicrobial properties - Fruit preservation performance of the Z-Nt films DOI : https://doi.org/10.1007/s11998-023-00902-3 En ligne : https://drive.google.com/file/d/1vrcT264bwZ5ER1KR9SfbGRm_Qd0FI4Rf/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41306 [article]

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Biogenic silver nanoparticle-coated low density polyethylene film with antibacterial and antioxidant properties / Sumi Maria Babu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1409-1420 Titre : Biogenic silver nanoparticle-coated low density polyethylene film with antibacterial and antioxidant properties Type de document : texte imprimé Auteurs : Sumi Maria Babu, Auteur ; Leon Ittiachen, Auteur Année de publication : 2024 Article en page(s) : p. 1409-1420 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aliments -- Emballages -- Aspect sanitaire Antibactériens Antioxydants Argent Biosynthèse Caractérisation Matériaux hybrides Nanoparticules -- Synthèse Polyéthylène basse densité Index. décimale : 667.9 Revêtements et enduits Résumé : In the present study, silver nanoparticles were biosynthesized using banana (Musa spp.) peel extract as the reducing agent. The biosynthesized particles were then characterized using scanning electron microscopy, X-ray diffraction, transmission electron microscopy and Fourier transform infrared spectroscopy. Biosynthesized silver nanoparticles were then evaluated for their antibacterial activity against Gram-positive and Gram-negative cocci bacteria through agar diffusion study and minimum inhibitory concentration, and minimum bactericidal concentration was determined. Low density polyethylene film was coated with the biosynthesized silver nanoparticles following the dip coating method. The nanoparticle incorporated polymer films were then evaluated for antibacterial and antioxidant activity by agar diffusion studies, dynamic shake flask studies and 2, 2- diphenyl-1-picryl-hydrazyl-hydrate free radical scavenging assay, respectively. The surface characterization of the prepared films was also performed to ensure the presence of silver nanoparticle coating. Note de contenu : - MATERIALS AND METHODS : Processing of plant resource material - Preparation of aqueous banana peel extract - Biosynthesis of silver nanoparticles - UV-Visible spectrophotometer analysis - Characterization of biosynthesized silver nanoparticles - Antibacterial activity of biosynthesized silver nanoparticles solution - Preparation of silver nanoparticle-coated low density polyethylene (LDPE) film - Characterization of silver nanoparticle-coated LDPE film - Antibacterial activity of silver nanoparticle-coated LDPE film - RESULTS AND DISCUSSION : Characterization of biosynthesized silver nanoparticles - Antibacterial activity of biosynthesized silver nanoparticles - Preparation and characterization of silver nanoparticle-coated LDPE film - Antibacterial activity of silver nanoparticle-coated LDPE film - Antioxidant activity of silver nanoparticle-coated LDPE film DOI : https://doi.org/10.1007/s11998-023-00903-2 En ligne : https://drive.google.com/file/d/13VwXxrc5Eq_Di41KpQYztzkFjtasZEB8/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41307 [article]

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Study on synthesis and properties of Na+-La3+ co-doped γ-Ce2S3 pigment by low-temperature self-propagating combustion method / Boyuan Wu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1421-1430 Titre : Study on synthesis and properties of Na+-La3+ co-doped γ-Ce2S3 pigment by low-temperature self-propagating combustion method Type de document : texte imprimé Auteurs : Boyuan Wu, Auteur ; Yueming Li, Auteur ; Fusheng Song, Auteur ; Kai Li, Auteur ; Yi Sun, Auteur ; Zhumei Wang, Auteur Année de publication : 2024 Article en page(s) : p. 1421-1430 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Chromaticité Valeur représentant la qualité d’une couleur sans comprendre sa luminance. Si deux lumières comprennent la même distribution spectrale normalisée par l’intensité, elles ont la même chromaticité, mais non pas vice versa. Particules -- Morphologie Pigments -- Synthèse Stabilité thermique Taille des particules Index. décimale : 667.2 Colorants et pigments Résumé : Na+-La3+ co-doped γ-Ce2S3 (abbreviated as γ-Na0.5Ce2.5 - xLaxS4) pigments with a fixed Na/(Ce1 - xLax) molar ratio of 0.2 (x = 0, 0.1, 0.5, 0.9, 1.3, 1.7, 2.1 and 2.5) were synthesized by low-temperature self-propagating combustion method. By adjusting the La3+ doping ratio, a series of γ-Na0.5Ce2.5 - xLaxS4 pigments with different colors were obtained by sulfurizing at 900°C for 2 h using CS2 as the sulfur source. The effects of La3+ doping amount on the synthesis of γ-Ce2S3, crystal structure, color performance, and temperature stability were systematically studied. The results show that the pigments exhibited a single cubic γ-Ce2S3 phase throughout the range of x increasing from 0 to 2.5. Compared with the co-precipitation method, the particle size of the pigment obtained by the low-temperature self-propagating combustion method decreased from 620 to 310 nm. Furthermore, as La3+ content increased, the band gap of the sample gradually increased from 2.06 to 2.90 eV, causing the color to change from red (L* = 39.42, a* = 40.35, b* = 30.28) to orange-red (L* = 49.15, a* = 35.51, b* = 40.64), then to orange-yellow (L* = 54.85, a* = 28.53, b* = 37.30), and finally to white-blue (L* = 66.66, a* = - 1.42, b* = 11.25). In addition, the thermal stability of γ-Na0.5Ce2.5 - xLaxS4 was evaluated by TG-DSC and its thermal stability increased from 350 to 480°C. Note de contenu : - EXPERIMENTAL : Precursor preparation - Sulfuration - Characterization - RESULTS AND DISCUSSION : Phase and structure analysis - Morphology, element content and distribution and particle size analysis - Chromaticity analysis - Temperature stability analysis DOI : https://doi.org/10.1007/s11998-023-000904-1 En ligne : https://drive.google.com/file/d/1OMWxzACQkSzKLVYqBCDbVu-TJqqeJ5IS/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41308 [article]

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Infrared-responsive shape memory self-healing and fluorescent damage-indication anti-corrosion coatings for aluminum alloys / Xue-qi Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1431-1446 Titre : Infrared-responsive shape memory self-healing and fluorescent damage-indication anti-corrosion coatings for aluminum alloys Type de document : texte imprimé Auteurs : Xue-qi Zhang, Auteur ; Rui Ding, Auteur ; Jie Xu, Auteur ; An-lan Ji, Auteur ; Yu-chen Zhang, Auteur ; Jie Fu, Auteur ; Xiao Lv, Auteur ; Lan Yao, Auteur ; Sheng-ying Yang, Auteur ; Qing-guo Mao, Auteur ; Xuan Liang, Auteur ; Jie Liu, Auteur ; Xiao Wang, Auteur Année de publication : 2024 Article en page(s) : p. 1431-1446 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium -- Alliages Anticorrosifs Anticorrosion Caractérisation Composites polymères Effet mémoire de forme Epoxydes Fluorescence Indication de dommages Métaux -- Revêtements protecteurs Revêtement autoréparant Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Widely applied aluminum alloys in ship hulls, underwater vehicles, and marine machinery experience severe corrosion in harsh marine environments. For corrosion protection of aluminum alloys, the most convenient, effective, and low-cost approach was the application of anti-corrosion coatings. Coatings possessing self-healing properties to spontaneously repair damages have emerged as a research focus for new types of coatings. In this study, focused on the indication and repair of anti-corrosion coating damages for aluminum alloys, the fluorescent aggregation-induced emission (AIE) composite probe, rhodamine-naphthalimide (RNI), was synthesized, and the composite polymer materials HPPA-SMPU containing 2-hydroxyphosphinoyl carboxylic acid-doped polyaniline and shape memory polyurethane were prepared. Coaxial electrospinning technology was introduced to combine the two and create the fibrous materials with the fiber wall constructed from HPPA-SMPU, encapsulating the interior RNI solution. The fibers were incorporated into the epoxy coatings. RNI exhibited water-triggered AIE, Al3+-CHEF (chelation-enhanced fluorescence), and pH-responsive fluorescent properties to indicate infrared laser-targeted points of coating damages. The photothermal properties of HPPA-SMPU caused localized heating of the damaged coatings, reaching the phase transition temperature of epoxy and SMPU, leading to softening, expansion, shape memory behavior, and healing of the coating damages. The self-healing approaches enhanced the protective performance of the coatings for aluminum alloys, showcasing and extending the development of synergistic and intelligent functions in novel self-healing coating technologies. Note de contenu : - EXPERIMENTAL : Reagent description - Preparation of rhodamine naphthalimide - Preparation of 2-hydroxyphosphonyl carboxylic acid doped polyaniline (HPPA) - Preparation of photothermal shape memory composite polymer HPPA-SMPU - Preparation of electrospinning HPPA-SMPU@RNI core-sheath structure fiber - Preparation of HPPA-SMPU@RNI composite coatings - Characterization of material structure and morphology - Testing for fluorescence properties of RNI in response to coating damage - Evaluation of photothermal shape memory performance of HPPA-SMPU - Evaluation of photothermal self-healing performance of composite coatings - RESULTS AND DISCUSSION : Structural characterization of RNI and HPPA-SMPU - Characterization of HPPA-SMPU@RNI fibers - The fluorescence properties of RNI and its indication of coating damages - Photothermal shape memory performance of HPPA-SMPU - Photothermal self-healing behavior of composite coatings - Damage-indication and self-healing mechanism of coating damages DOI : https://doi.org/10.1007/s11998-023-000905-0 En ligne : https://drive.google.com/file/d/13z06vWc-NS6tpL__FToEg-SnEaAbffKf/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41309 [article]

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Insights into the corrosion mitigation efficacy of modified SiO2/GO-based epoxy composite coatings for aluminum alloy AA6061 in marine applications / Arshad Ali Khan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1447-1466 Titre : Insights into the corrosion mitigation efficacy of modified SiO2/GO-based epoxy composite coatings for aluminum alloy AA6061 in marine applications Type de document : texte imprimé Auteurs : Arshad Ali Khan, Auteur ; Afzal Khan, Auteur ; Zainab Zafar, Auteur ; Ishaq Ahmad, Auteur Année de publication : 2024 Article en page(s) : p. 1447-1466 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium -- Alliages Anticorrosifs Anticorrosion Caractérisation Dioxyde de silicium Epoxydes Éther de diglycidyle et de bisphénol A Marines (peinture) Matériaux hybrides Métaux -- Revêtements protecteurs Oxyde de graphène Revêtements -- Analyse Index. décimale : 667.9 Revêtements et enduits Résumé : The corrosion protection of aluminum alloys is severely compromised by marine environments, demanding the formulation of efficient protective coatings. Epoxy resin, diglycidyl ether of bisphenol A (DGEBA), and curing agent diethylenetriamine (DETA) were used with the mixing ratio of 100:12 to synthesize functionalized SiO2/GO-based composite coatings and investigate the corrosion protection efficacy for aluminum alloy AA6061 in marine environments. To boost the coatings' barrier and anticorrosive attributes, functionalized silica (FSiO2, with 0, 3, 6, 9, 12, and 15 wt%) and graphene oxide (GO) were jointly incorporated into the DGEBA/DETA epoxy-hardener system for producing composite coatings. The functionalization of silica particles using 3-aminopropyl-triethoxysilane and synthesis of GO was successfully carried out, according to the Fourier transform infrared spectroscopy evidence. The structural properties were investigated by X-ray diffraction. The hydrophobicity tests were conducted for the measurement of the contact angles. The highest static contact angle (126° ± 2) and the lowest contact angle (74° ± 1.5) were recorded for the sample EHS9GO2 and AA6061, respectively, which showed that EHS9GO2 coating had the most hydrophobic behavior. An adhesion test (method B, tape test) was performed on prepared coatings to check the quality of adhesion with the substrate aluminum alloy AA6061. The neat epoxy coating (EHS0GO0) displayed a fair adhesion rating of 3B, while EHS9GO2 coating exhibited excellent adhesion (5B) with substrate AA6061. Furthermore, electrochemical impedance spectroscopy and potentiodynamic polarization tests were employed for assessing the electrochemical behavior and anticorrosion performance of the prepared coatings. It was observed from the Bode plot, that the impedance magnitude/modulus for EHS9GO2 at lower frequencies was the highest as compared to other samples during immersion in the artificial seawater. The bare aluminum alloy substrate AA6061 had the highest corrosion rate of value 0.10483 ± 0.00198 mm/year, due to the direct contact with the electrolyte. Moreover, the highest value of Ecorr (356 ± 0.42 mV) and lowest values of Icorr (0.18 ± 0.03µA), βa (48.7 ± 2 mV/decade), and βc (28.8 ± 1 mV/decade) were witnessed for EHS9GO2 coating, showing significant anticorrosion efficiency against the corrosive electrolyte. Note de contenu : - EXPERIMENTAL : Materials, chemicals, and reagents - Epoxy resin and curing agent attributes - Surface modification of SiO2 particles - Synthesis of graphene oxide (GO) - Elemental composition of AA6061 - Fabrication of AA6061 and composite samples - Characterization - RESULTS AND DISCUSSION : Reaction mechanism - FTIR spectroscopy analysis - X-ray diffraction (XRD) examination - Contact angle measurement - Coatings adhesion assessment - Morphology - Electrochemical and corrosion protection performance DOI : https://doi.org/10.1007/s11998-023-000906-z En ligne : https://drive.google.com/file/d/1I2CSf8KcWcqezmqEPi0ol1DY5PitpxlV/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41310 [article]

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Antifouling efficiency of polymer coatings with SeNPs-loaded SiO2(rh)-PHMG composite as antimicrobial agent / U. Kharchenko in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1467-1482 Titre : Antifouling efficiency of polymer coatings with SeNPs-loaded SiO2(rh)-PHMG composite as antimicrobial agent Type de document : texte imprimé Auteurs : U. Kharchenko, Auteur ; I. Beleneva, Auteur ; O. Arefieva, Auteur ; V. Egorkin, Auteur ; N. Izotov, Auteur ; I. Vyaliy, Auteur ; D. A. Nguyen, Auteur ; S. Sinebrukhov, Auteur ; S. Gnedenkov, Auteur Année de publication : 2024 Article en page(s) : p. 1467-1482 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antimicrobiens Caractérisation Charges (matériaux) Dioxyde de silicium Ecotoxicologie Epoxydes Evaluation Matériaux amorphes Nanoparticules 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. Polyhexaméthylène guanidine Revêtements antisalissures Revêtements organiques Sélénium Siloxanes Les siloxanes sont une classe de composés du silicium dont la formule empirique est R2SiO, où R est un groupe radical qui peut être organique. Des exemples représentatifs sont [SiO(CH3)2]n (diméthylsiloxane) et [SiO(C6H5)2]n (diphénylsiloxane), où n est typiquement supérieur à 4. Ces composés peuvent être des hybrides organiques et inorganiques. Les chaînes organiques confèrent au composé des propriétés hydrophobes alors que la chaîne principale -Si-O-Si-O- est purement inorganique. Le mot siloxane est dérivé de Silicium, Oxygène et alkane. Des siloxanes peuvent être trouvés dans des produits tels que des cosmétiques, des déodorants, des enduits hydrophobes pour pare-brise, des peintures et certains savons. Les siloxanes polymérisés (polysiloxanes) sont appelés silicones1,2. Le siloxane est massivement utilisé dans l'industrie cosmétique (rouges à lèvre, conditionneurs et shampooings, déodorants, etc.). Une application récente du Siloxane D5 (2001) a été trouvée dans le nettoyage à sec des textiles en remplacement du perchloroéthylène. Ce procédé est très répandu aux États-Unis et au Royaume-Uni. Il devient de plus en plus courant en Europe continentale dont la France, afin de promouvoir l'usage de procédés écologiques et respectueux de la santé humaine. Index. décimale : 667.9 Revêtements et enduits Résumé : Silica from rice husk [SiO2(rh)] was used as a mineral base for sequential loading of biogenic selenium nanoparticles (SeNPs) and polyhexamethylene guanidine (PHMG) hydrochloride. As result a filler for polymer coatings with a wide spectrum of antifouling activity was obtained. The complex filler was characterized by scanning electron microscopy, energy dispersive X-ray analysis, and transmission electron microscopy. The filler was introduced into epoxy (EP), polydimethylsiloxane (PDMS), and epoxy-siloxane (EP-PDMS) polymer matrices at 3 wt% and 5 wt% to evaluate their antifouling performance and effect on the durability characteristics of coatings. Characterization of the coatings was performed including water contact angle, surface free energy, pseudo-barnacle adhesion strength and modulus of elasticity. The in vitro antimicrobial properties of the prepared samples were evaluated using Staphylococcus aureus and Candida albicans. Antifouling properties were evaluated in field tests for 7 months. The incorporation of a complex filler involving SeNPs and PHMG made it possible to increase the coating resistance to fouling by 2–5 times. The best results were observed for the EP-PDMS sample with 5 wt% SiO2(rh)-SeNPs-PHMG characterized by low values of surface free energy (10.3 mN/m) and pseudo-barnacle adhesion strength (0.32 MPa) and acceptable rate of biocidal components release. The results indicate the promising use of the new filler for development of effective antifouling coatings. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of the polymer coatings with antimicrobial filler - Characterization of modified fillers and polymer coatings - Contact angle measurement and surface energy calculation - Antimicrobial activity test - Marine fouling tests - Assessment of coating ecotoxicity - RESULTS : Preparation and characterization of SiO2(rh)-SeNPs-PHMG filler - Characterization of polymer coatings with modified SiO2(rh) DOI : https://doi.org/10.1007/s11998-023-000907-y En ligne : https://drive.google.com/file/d/1G7MbWxxWxkMnL-QYMe5qF3RhDeuLJT79/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41311 [article]

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Titanium dioxide and silver nanoparticles applied in mineral paints for outdoor and indoor environments / Isabel C. R. Gomes in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1483-1498 Titre : Titanium dioxide and silver nanoparticles applied in mineral paints for outdoor and indoor environments Type de document : texte imprimé Auteurs : Isabel C. R. Gomes, Auteur ; Katia J. Ciuffi, Auteur ; Liziane Marçal, Auteur ; Lucas A. Rocha, Auteur ; Eduardo J. Nassar, Auteur Année de publication : 2024 Article en page(s) : p. 1483-1498 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adsorption Angle de contact Argent Dioxyde de titane Formulation (Génie chimique) Liants Nanoparticules Oxydes métalliques pH Photocatalyse Revêtements -- Analyse:Peinture -- Analyse Semiconducteurs Index. décimale : 667.9 Revêtements et enduits Résumé : Here, we have evaluated water-based paint formulations containing mineral binders, silver nanoparticles, and titanium dioxide. Scanning electron microscopy analysis of dried film samples showed that the paint base was highly porous, and that paint formulations containing 10% and 20% titanium dioxide had different surface morphology. CIELab measurements for methylene blue coloration decay showed that photocatalysis was more efficient for the samples with 20% titanium dioxide. Under ultraviolet radiation, silver nanoparticles contributed to photocatalysis performance. Contact angles proved that titanium dioxide concentration and type defined the wetting characteristics. The samples with 20% TiO2 displayed porous surfaces with better adsorbance characteristics, higher wettability, and improved heterogeneous photocatalysis. Note de contenu : - EXPERIMENTAL DETAILS : Chemicals and reagents - Solution of silver nanoparticles - Paint formulations - Determination of pH - Scanning electron microscopy (SEM) - X-ray diffraction (XRD) - Contact angle - Evaluation of adsorption kinetics - Photocatalysis - RESULTS AND DISCUSSION : Silver nanoparticles – Ag-NPs pH measurement - Scanning electron microscopy (SEM) - X-ray diffraction (XRD) - Contact angle - Photocatalysis - Adsorption DOI : https://doi.org/10.1007/s11998-023-000909-w En ligne : https://drive.google.com/file/d/1lCq0E6CK12Cn7_L7Vuz8M4a1m_4fWspc/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41312 [article]

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Study of SiO2 aerogel/CNTs photothermal de-icing coating for wind turbine blades / Jianjun He in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1499-1512 Titre : Study of SiO2 aerogel/CNTs photothermal de-icing coating for wind turbine blades Type de document : texte imprimé Auteurs : Jianjun He, Auteur ; Jingyi Yan, Auteur ; Min Pu, Auteur ; Jun Jie, Auteur ; Guangwu Luo, Auteur ; Zijing Zeng, Auteur ; Zihao Duan, Auteur ; Caiyuan Huang, Auteur Année de publication : 2024 Article en page(s) : p. 1499-1512 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aérogels Caractérisation Dioxyde de silicium Eoliennes -- Revêtements protecteurs Nanotubes Pales d'éoliennes Revêtements antigel Index. décimale : 667.9 Revêtements et enduits Résumé : Ice on the surface of wind turbine blades may result in power production losses and unsafe operations. An effective technological solution to the ice issue is coating de-icing. This study first constructed SiO2 aerogel/CNTs (carbon nanotube) coating with photothermal de-icing by incorporating photothermal nanoparticles into the created nanoporous structure. The coating structure examined by SEM and EDS analysis demonstrates that CNT particles can be well captured by the three-dimensional nanostructure of SiO2 aerogel and form a stable symbiotic skeleton. After that, we examined how the quantity of CNT doping affected the coating's surface morphology and photothermal properties. The findings demonstrated that the C-6 coating made from 0.6% CNTs performed best. Utilizing the photothermal effect of CNTs, it exhibited a steady rate of temperature increase and reached the target temperature of 153.4°C in 561 s upon near-infrared light (808 nm) irradiation. According to the results of experiments testing the photothermal performance, mechanical/chemical stability, and applicability of the coating, the coating has the advantages of being lightweight, provides quick de-icing, high stability, and simple production. This study not only increases the viability of using coating de-icing technology on wind turbine blades but also offers creative solutions to scientific investigation in the area of coating de-icing. Note de contenu : - EXPERIMENTAL METHODS : Materials and chemicals - Preparation of SiO2/CNTs coatings - Characterization and experimental procedure - RESULTS AND DISCUSSION : Morphology of SiO2/CNTs photothermal coating - Effect of CNTs on the surface morphology of coatings - Effect of CNTs on the photothermal properties of coatings - Analysis of the mechanical stability of the coating - Coating chemical stability performance analysis - Study of the applicability of de-icing on wind turbine blade surfaces - De-icing performance of coatings at different ice thicknesses - Effect of near-infrared light on the de-icing performance of coatings - The coating's dynamic cyclic de-icing performance and absorption spectra DOI : https://doi.org/10.1007/s11998-023-000910-x En ligne : https://drive.google.com/file/d/1AgBs-nIsnHyiE0ud1TcVn1LnXX__-jYO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41313 [article]

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Preparation and performance study of hydrophobic fumed silica loaded with BTA/epoxy composite coating / Xin Sun in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1513-1523 Titre : Preparation and performance study of hydrophobic fumed silica loaded with BTA/epoxy composite coating Type de document : texte imprimé Auteurs : Xin Sun, Auteur ; Yan Zhang, Auteur ; Xinyu Wang, Auteur ; Xiaomei Wang, Auteur ; Minsheng Bu, Auteur ; Qiyuan Li, Auteur ; Xiao Wang, Auteur ; Wei Lu, Auteur ; Weili Li, Auteur ; Zheng-Bai Zhao, Auteur Année de publication : 2024 Article en page(s) : p. 1513-1523 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Benzotriazole Caractérisation Composites Epoxydes Hydrophobie Revêtements -- Propriétés mécaniques Revêtements organiques Revêtements protecteurs Silice pyrogénée La silice pyrogénée (numéro CAS 112945-52-5, fumed silica en anglais) est une forme de dioxyde de silicium, ou silice, de formule chimique SiO2. Elle se présente comme une poudre constituée de gouttelettes de silice fondue refroidies en formant des chaînes tridimensionnelles qui s'organisent en particules de matière amorphe de très faible masse volumique apparente et de surface spécifique très élevée. Cette structure particulière entraîne un comportement thixotrope accroissant la viscosité des substances dans lesquelles elle est utilisée comme épaississant ou comme charge dans les matières plastiques. Applications : La silice pyrogénée est un épaississant et un anti-agglomérant largement utilisé dans les poudres. Comme le gel de silice, elle peut être utilisée comme absorbeur d'humidité. On la retrouve dans les cosmétiques du fait de ses propriétés de diffusion de la lumière. Elle est utilisée comme abrasif doux dans le dentifrice, comme charge dans les élastomères en silicone et pour l'ajustement de la viscosité de peintures, revêtements, encres, adhésifs et résines de polyesters insaturés. (Wikipedia) Index. décimale : 667.9 Revêtements et enduits Résumé : Multifunctional anti-corrosive coatings are a key focus in the development of modern coatings. In this study, the corrosion inhibitor benzotriazole (BTA) was loaded onto fumed silica (SiP) through physical adsorption, and then the surface of SiP was modified with octadecyl trimethylsilane (OTMS) to create a modified fumed silica supported by BTA (BTA-SiP@OTMS). The resulting sample was blended with epoxy resin to create a composite coating with both anti-corrosive and hydrophobic properties. The OTMS modification effectively covers the surface of the fumed silica, transforming the composite coating from hydrophilic to hydrophobic. This hydrophobicity prevents the penetration of corrosive mediums. The addition of BTA-SiP@OTMS significantly increases the impedance value of the composite coating, indicating improved corrosion resistance. Due to its hydrophobic and anti-corrosion properties, the composite coating shows promising potential in weather-resistant coatings. Note de contenu : - EXPERIMENTAL METHODS : Experimental - Materials - Preparation of BTA-SiP filler - Preparation of BTA-SiP@OTMS filler - Preparation of BTA-SiP@OTMS/EPR composite coating - Characterization - RESULTS AND DISCUSSION : Preparation of BTA-SiP@OTMS filler - Characterization of BTA-SiP@OTMS filler - Characterization of BTA-SiP@OTMS/EPR composite coatings - Anti-corrosion of BTA-SiP@OTMS/EPR composite coatings - Hydrophobicity of BTA-SiP@OTMS/EPR composite coatings - Mechanical properties of BTA-SiP@OTMS/EPR composite coatings DOI : https://doi.org/10.1007/s11998-023-000912-9 En ligne : https://drive.google.com/file/d/1KqX-joj7gwZY4Q2114ijjyNEoN3DiGHj/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41314 [article]

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Enhancing the functionality of biodegradable Mg–Zn–Mn alloys using poly(lactic) acid (PLA) coating for temporary implants / Prakash Kumar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 4 (07/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 4 (07/2024) . - p. 1525-1537 Titre : Enhancing the functionality of biodegradable Mg–Zn–Mn alloys using poly(lactic) acid (PLA) coating for temporary implants Type de document : texte imprimé Auteurs : Prakash Kumar, Auteur ; Gajanan Anne, Auteur ; M. R. Ramesh, Auteur ; Mrityunjay Doddamani, Auteur ; Ashwini Prabhu, Auteur Année de publication : 2024 Article en page(s) : p. 1525-1537 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biodégradation Caractérisation Corrosion Cytocomptabilité Implants résorbables Magnésium -- Alliages Polymères en médecine Revêtements -- Propriétés mécaniques Sol-gel, Procédé Technologie médicale Index. décimale : 667.9 Revêtements et enduits Résumé : Polylactic acid (PLA) was coated on biodegradable Mg–Zn–Mn alloys using a sol–gel coating technique for temporary implant applications. The presence of smooth, dense, crack-free PLA coating was evidenced using Fourier transform infrared spectroscopy (FTIR) and a scanning electronic microscope (SEM) equipped with an energy-dispersive X-ray spectroscopy (EDX) module. The strength of the bond between PLA and the Mg–Zn–Mn alloys was investigated as per ASTM D3359 and found to be 4B. The degradation behavior was evaluated using potentiodynamic polarization and electrochemical impedance spectroscopy in a simulated body fluid (SBF) solution. The corrosion rate of the PLA–Mg–Zn–Mn sample was found to be 0.00363 mm/y, which is 73% better than the bare Mg–Zn–Mn sample (0.00493 mm/y). In addition, the results of the cytotoxicity assay indicated the cytocompatibility of the implant material on MG-63 osteoblast-like cells, confirming its safety on the bone cells. The efficacy of the use of PLA coating on the biodegradable Mg–Zn–Mn is due to the synergistic effect of both physical and chemical interactions between the PLA layer and the substrate. Note de contenu : - EXPERIMENTAL MATERIALS : PLA sol–gel coating on Mg–Zn–Mg alloy - Characterization - In vitro corrosion studies - Hydrogen evolution - Cytocompatibility of the test composites - RESULTS AND DISCUSSION : Mg-4Zn-1Mn sample surface characterization - Mechanical properties - Corrosion behavior - Hydrogen evolution - Cytocompatibility DOI : https://doi.org/10.1007/s11998-023-000913-8 En ligne : https://drive.google.com/file/d/1PbKQ_Wks0hFptVAAQi-9ya6tjvP3YDvF/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41315 [article]

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