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Surface degradation and nanoparticle release of a commercial nanosilica/polyurethane coating under UV exposure / Deborah S. Jacobs in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 735-751 Titre : Surface degradation and nanoparticle release of a commercial nanosilica/polyurethane coating under UV exposure Type de document : texte imprimé Auteurs : Deborah S. Jacobs, Auteur ; Sin-Ru Huang, Auteur ; Yu-Lun Cheng, Auteur ; Savelas Rabb, Auteur ; Justin M. Gorham, Auteur ; Peter J. Krommenhoek, Auteur ; Lee L. Yu, Auteur ; Tinh Nguyen, Auteur ; Lipiin Sung, Auteur Année de publication : 2016 Article en page(s) : p. 735-751 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Essais accélérés (technologie) Nanoparticules Photodétérioration Polyuréthanes Revêtements -- Analyse:Peinture -- Analyse Revêtements -- Détérioration:Peinture -- Détérioration Revêtements -- Effets du rayonnement ultraviolet:Peinture -- Effets du rayonnement ultraviolet 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 : Many coating properties such as mechanical, electrical, and ultraviolet (UV) resistance are greatly enhanced by the addition of nanoparticles, which can potentially increase the use of nanocoatings for many outdoor applications. However, because polymers used in all coatings are susceptible to degradation by weathering, nanoparticles in a coating may be brought to the surface and released into the environment during the life cycle of a nanocoating. Therefore, the goal of this study is to investigate the process and mechanism of surface degradation and potential particle release from a commercial nanosilica/polyurethane coating under accelerated UV exposure. Recent research at the National Institute of Standards and Technology (NIST) has shown that the matrix in an epoxy nanocomposite undergoes photodegradation during exposure to UV radiation, resulting in surface accumulation of nanoparticles and subsequent release from the composite. In this study, specimens of a commercial polyurethane (PU) coating, to which a 5 mass% surface-treated silica nanoparticle solution was added, were exposed to well-controlled, accelerated UV environments. The nanocoating surface morphological changes and surface accumulation of nanoparticles as a function of UV exposure were measured, along with chemical change and mass loss using a variety of techniques. Particles from the surface of the coating were collected using a simulated rain process developed at NIST, and the collected runoff specimens were measured using inductively coupled plasma optical emission spectroscopy to determine the amount of silicon released from the nanocoatings. The results demonstrated that the added silica nanoparticle solution decreased the photodegradation rate (i.e., stabilization) of the commercial PU nanocoating. Although the degradation was slower than the previous nanosilica epoxy model system, the degradation of the PU matrix resulted in accumulation of silica nanoparticles on the nanocoating surface and release to the environment by simulated rain. These experimental data are valuable for developing models to predict the long-term release of nanosilica from commercial PU nanocoatings used outdoors and, therefore, are essential for assessing the health and environmental risks during the service life of exterior PU nanocoatings. Note de contenu : - EXPERIMENTAL PROCEDURES : Sample preparation - UV exposure - CHARACTERIZATION : Surface morphology and composition - Chemical degradation - Mass loss - Nanoparticle release - RESULTS AND DISCUSSION : Surface morphology and composition - Chemical degradation - Mass loss - Nanoparticle release - Mechanism of nanoparticle release by UV exposure DOI : 10.1007/s11998-016-9796-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9796-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27107 [article]

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Novel thermal and photo curable anti-reflective coatings using fluoroelastomer nanocomposites and self-assembly of nanoparticles / Konstantinos Kourtakis in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 753-762 Titre : Novel thermal and photo curable anti-reflective coatings using fluoroelastomer nanocomposites and self-assembly of nanoparticles Type de document : texte imprimé Auteurs : Konstantinos Kourtakis, Auteur ; Paul Bekiarian, Auteur ; Gregory Blackman, Auteur ; Mark Lewittes, Auteur ; Shekhar Subramoney, Auteur Année de publication : 2016 Article en page(s) : p. 753-762 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Essais dynamiques Fluoroélastomères Formulation (Génie chimique) Matériaux -- Propriétés fonctionnelles Nanoparticules Photoréticulation Réaction de couplage Résistance à l'abrasion Revêtement antireflet:Peinture antireflet Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Revêtements -- Propriétés optiques:Peinture -- Propriétés optiques Silanes 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. Systèmes auto-assemblés Index. décimale : 667.9 Revêtements et enduits Résumé : We describe novel optical coatings which require either thermal or photocuring to render them mechanically robust and abrasion resistant. These new coatings are low refractive index fluoroelastomer-nanoparticle composites that form a unique nanostructure during drying of the liquid coating. During drying, the nanoparticles in these liquid coatings migrate towards the substrate. The final, 100-nm-thick anti-reflective coatings are novel and exhibit a unique bilayer structure in which the nanoparticles are ordered and segregated towards the substrate. The coatings are rapidly cured using a new process and exhibit surprising “scratch durability” as measured by aggressively testing with steel wool. Sol gel chemistry is used which involves the reaction of the nanoparticles with an acrylic oxysilane to form nanoparticles which are functionalized with sol gel derived oligomers. The functionalized nanoparticles are combined with a fluoroelastomer containing a free radical initiator and multiolefinic crosslinker, and the composite film is rapidly cured by a thermal or UV process at low temperatures. The final product is a mechanically robust, low refractive index anti-reflective film which is useful for displays and photovoltaic devices. These are unique fluoropolymer nanocomposites which utilize nanoparticle self-assembly to enhance important properties. Note de contenu : - EXPERIMENTAL METHODS : Fluoroelastomer matrix polymer - Coating compositions : composites with fluoroelastomer and silica nanoparticles - Thermally cured formulations -Phothchemically cured formulations - Coating process by reverse microgravure - Optical measurements of cured films - Abrasion testing - Software analysis to determine abrasion resistance - Nanoscratch test for abrasion resistance - High-resolution microscopy - RESULTS AND DISCUSSION : Nanoparticle and silane coupling agents - Fluoroelastomer nanocomposites : impact of silica nanoparticles and silane coupling agent - Formulation of bilayer structure DOI : 10.1007/s11998-016-9785-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9785-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27112 [article]

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Synthesis and properties of novel acrylic polyester hyper-dispersant / Wei Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 763-768 Titre : Synthesis and properties of novel acrylic polyester hyper-dispersant Type de document : texte imprimé Auteurs : Wei Liu, Auteur ; Liang Cheng, Auteur ; Xinding Yao, Auteur ; Ruina Fang, Auteur ; Guoji Liu, Auteur Année de publication : 2016 Article en page(s) : p. 763-768 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acrylate de 3-pentadécylphényle Acrylate de butyle Agents dispersants (chimie) Composés organiques -- Synthèse Dioxyde de titane Dispersions et suspensions Méthacrylique, Acide L'histoire de l'acide méthacrylique commence en 1865, année où il est synthétisé pour la première fois à partir du méthacrylate d'éthyle. L'acide méthacrylique est très réactif avec les groupes carboxyles, vinyles et esters. Polyacryliques Polymérisation solvants Taille des particules Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : 3-Pentadecylphenyl acrylate (PDPA) was synthesized from renewable sources (the cashew nut shell liquid), by using a novel organic chemical intermediate that can be used to copolymerize with vinyl monomers. A novel acrylic polyester hyper-dispersant was prepared by polymerization of methacrylic acid (MAA), butyl acrylate (BA), and PDPA. The acrylic polyester hyper-dispersants were used to disperse titanium dioxide in non-polar solvent system, and the dispersion performance was studied. The viscosity and particle size of suspensions were affected by monomer ratio and molecular weight; the results showed that the optimum monomer ratio and molecular weight were MAA:BA:PDPA = 1:10:1.2 (wt%) and 6000, respectively. The optimum amount weight of MAA of acrylic polyester should be around 10% (wt%). Note de contenu : - EXPERIMENTAL : Materials - Preparation of acrylic polyester copolyester - Structure analysis - The viscosity and particle size of suspensions - RESULTS AND DISCUSSION : Structure analysis - Effect of molecular weight - Effect of amount of anchor group DOI : 10.1007/s11998-016-9787-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9787-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27113 [article]

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Design and application of nanoparticle coating system with decoupled spray generation and deposition control / Maxym V. Rukosuyev in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 769-779 Titre : Design and application of nanoparticle coating system with decoupled spray generation and deposition control Type de document : texte imprimé Auteurs : Maxym V. Rukosuyev, Auteur ; Oleksandr Barannyk, Auteur ; Peter Oshkai, Auteur ; Martin B. G. Jun, Auteur Année de publication : 2016 Article en page(s) : p. 769-779 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Atomisation Dépôt par pulvérisation Essais (technologie) Nanoparticules Revêtements Ultrasons Index. décimale : 667.9 Revêtements et enduits Résumé : Coatings are widely used in various biomedical applications to change the interaction of the surfaces with bioactive materials. The key factors that determine the quality of a spray-coated layer are the size (order of a few microns in diameter) and dimensional uniformity of droplets in the spray and the droplet impact velocity. For many applications, coating quality is strongly dependent on the method and equipment used during the application process. This paper presents the development of a decoupled system for spray coating and micro-printing, which includes an ultrasonic spray generation device and a nozzle for the spray deposition independently operated. Design and development of the system as well as testing for different applications are presented in this paper. The system design can be potentially used for large area coating, such as windows and solar panels, as well as micro-printing of electronic circuits and numerous other applications. Note de contenu : - NOTE ON PARTICLE IMPACT DYNAMICS - DESIGN : Design concept and system development - High-speed imaging and PIV analysis of the resultant jet - Uniform coating performance testing - Dual-inlet test - APPLICATIONS AND RESULTS : Printing - Antireflective - Coating for improved 3D scanning DOI : 10.1007/s11998-016-9788-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9788-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27114 [article]

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Phenyl carbamate end-capped oligoesters : a model for hydrolytic stability of ester-based urethanes / Mayela Ramirez-Huerta in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 781-793 Titre : Phenyl carbamate end-capped oligoesters : a model for hydrolytic stability of ester-based urethanes Type de document : texte imprimé Auteurs : Mayela Ramirez-Huerta, Auteur ; Irina J. Zvonkina, Auteur ; Mark D. Soucek, Auteur Année de publication : 2016 Article en page(s) : p. 781-793 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composés aliphatiques Composés organiques -- Synthèse Hydrolyse Hydroxyle En chimie organique, un hydroxyle (ou oxhydryle) peut désigner deux entités. Un groupement -OH, appelé aussi hydroxy, qui se rencontre en particulier dans les alcools et les phénols. Un radical : HO^{\bullet}. Il est produit par exemple lors de réactions de dissociation de peroxydes, en présence d'ions de métaux de transition (Fe(II), Cu(I), réaction de Fenton), de chauffage ou de rayonnement. Isocyanate de phényle Oligomères Polyesters Polymères -- Détérioration Index. décimale : 667.9 Revêtements et enduits Résumé : A series of hydroxyl-terminated oligoesters were synthesized to determine the structural effects on the relative rates of hydrolysis in both acidic and alkaline media. Model compounds consisting of one diol and one dibasic acid were used because the simplicity of the chemical structure allowed for the analysis of individual effects. Linear, cycloaliphatic, and aromatic dibasic acids were used. The diacids were reacted with a series of linear and bulky diols. All hydroxyl-terminated oligoesters were end-capped with phenyl isocyanate. Three different stages were distinguished in the case of aliphatic oligoesters, while more bulky structures (cycloaliphatic and aromatics) only presented one or two stages. Hydrolysis rates showed a complex behavior where steric and anchimeric effects play a mutual role on initial hydrolysis rates. Note de contenu : - Materials - Synthesis of the hydroxyl-terminated oligoesters - Synthesis of the urethane end-capped oligoesters - Characterization of the end-capped oligoesters - Sample preparation and acid number evaluation - Acid number evaluation (Aac) - Gel permeation chromatography (GPC) - Linear aliphatic- and cycloaliphatic-based oligoesters - Aromatic-based oligoesters DOI : 10.1007/s11998-016-9798-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9798-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27115 [article]

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Preparation and surface properties of poly(2,2,2-trifluoroethyl methacrylate) coatings modified with methyl acrylate / An-hou Xu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 795-804 Titre : Preparation and surface properties of poly(2,2,2-trifluoroethyl methacrylate) coatings modified with methyl acrylate Type de document : texte imprimé Auteurs : An-hou Xu, Auteur ; Lu-qing Zhang, Auteur ; Jia-chen Ma, Auteur ; Yan-ming Ma, Auteur ; Bing Geng, Auteur ; Shu-xiang Zhang, Auteur Année de publication : 2016 Article en page(s) : p. 795-804 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymères Polyacrylate de méthyle Polyméthacrylates Solutions de polymère Surfaces -- Analyse Transition vitreuse Index. décimale : 667.9 Revêtements et enduits Résumé : A series of copolymers of 2,2,2-trifluoroethyl methacrylate (FMA) and methyl acrylate (MA) with different copolymer compositions were synthesized by solution polymerization. The chemical structure of copolymers was characterized by fourier transform infrared spectroscopy (FTIR), 1H NMR, and 19F NMR. The reactivity ratios for FMA (r1) and MA (r2) were found to be 1.83 and 0.31 by the Fineman–Ross method and 1.91 and 0.34 by the Kelen–Tudos method, respectively. The glass transition temperature of the copolymers decreased with increasing MA content and ranged from 77.5 to 13.4°C for a feed composition of 90 mol% MA monomer, while, according to water contact angle data, the hydrophilic properties of the copolymer coatings increased with increasing MA feed composition. Remarkably, when the feed composition of MA was 60 mol%, the glass transition temperature was reduced to 29.2°C, while the obtained copolymer exhibited comparable hydrophobic property to the PFMA homopolymer. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of poly(FMA-co-MA) - Copolymer coating preparation - Characterization - RESULTS AND DISCUSSION : Structure characterization - Determination of the monomer reactivity ratios - Thermal properties DOI : 10.1007/s11998-016-9793-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9793-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27116 [article]

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Synthesis of 3-glycidoxypropyltrimethoxysilane modified hydrotalcite bearing molybdate as corrosion inhibitor for waterborne epoxy coating / Thi Xuan Hang To in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 805-813 Titre : Synthesis of 3-glycidoxypropyltrimethoxysilane modified hydrotalcite bearing molybdate as corrosion inhibitor for waterborne epoxy coating Type de document : texte imprimé Auteurs : Thi Xuan Hang To, Auteur ; Nguyen Tuan Anh, Auteur ; Anh Truc Trinh, Auteur ; Bui Van Truoc, Auteur ; Hoang Thai, Auteur ; Dinh Thi Mai Thanh, Auteur ; Siriporn Daopiset, Auteur Année de publication : 2016 Article en page(s) : p. 805-813 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Epoxydes Hydrotalcites Molybdate Un molybdate est une espèce chimique qui contient un oxyanion possédant un atome de molybdène à son nombre d'oxydation maximum de +6. Le molybdène peut former une grande variété d'oxyanions, qui peuvent se présenter comme des structures discrètes ou bien des structures étendues polymérisées, ces dernières ne se trouvant qu'à l'état solide. Les oxyanions de molybdène discrets vont du MoO42–, qu'on trouve par exemple dans le molybdate de sodium Na2MoO4, jusqu'aux très grandes structures telles que le bleu de molybdène [Mo154O462H14·70H2O]14− dit « hétéropolymolybdène ». Parmi les éléments du groupe 6 du tableau périodique, le molybdène a un comportement voisin de celui du tungstène1 mais très différent de celui du chrome, qui ne forme que les chromates CrO42–, Cr2O72–, Cr3O102– et Cr4O132– qui ont tous une géométrie tétraédrique. Revêtements en phase aqueuse:Peinture en phase aqueuse Silanes Index. décimale : 667.9 Revêtements et enduits Résumé : Zinc aluminum hydrotalcite intercalated with molybdate (HTM) and modified by 3-glycidoxypropyltrimethoxysilane (HTM-GS) was prepared and incorporated into a waterborne epoxy coating. The synthesized HTM-GS was characterized by FTIR, XRD, SEM, and TEM. The inhibitive action of HTM-GS on carbon steel was evaluated using electrochemical measurement and SEM/EDX analysis. The corrosion protection of the waterborne epoxy coating containing HTM-GS was evaluated and compared to that of the pure waterborne epoxy coating and the waterborne epoxy coating containing HTM by salt spray test and adhesion measurement. It was shown that the molybdate was intercalated in the hydrotalcite structure and the molybdate contents in HTM and HTM-GS were 16.0 and 13.2 wt%, respectively. The polarization curves obtained on the carbon steel electrode showed that HTM and HTM-GS are anodic corrosion inhibitors, and their inhibition efficiencies at concentration of 3 g/l were 92.0 and 94.7%, respectively. Additionally, HTM and HTM-GS at concentration of 0.5 wt% improved corrosion resistance and adhesion of waterborne epoxy coatings. Surface modification by 3-glycidoxypropyltrimethoxysilane ameliorated the dispersion of HTM in epoxy matrix and the effect of HTM on protection properties of waterborne epoxy coating. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of molybdate intercalated hydrotalcite - Modification of HTM by 3-glycidoxypropyltrimethoxysilane - Preparation of waterborne epoxy coatings - Analytical characterization - Electrochemical characterization - Adhesion measurement - Salt spray test - RESULTS AND DISCUSSION : Characterization of HTM-GS - Corrosion inhibition effect of HTM-GS - Corrosion protection of carbon steel by waterborne epoxy coatings containing HTM-GS DOI : 10.1007/s11998-016-9791-7 En ligne : http://link.springer.com/content/pdf/10.1007%2Fs11998-016-9791-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27119 [article]

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Tailoring the properties of deposited thin coating and print features in flexography by application of UV-ozone treatment / Tamara Tomasegovic in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 815-828 Titre : Tailoring the properties of deposited thin coating and print features in flexography by application of UV-ozone treatment Type de document : texte imprimé Auteurs : Tamara Tomasegovic, Auteur ; David Beynon, Auteur ; Tim Claypole, Auteur ; Sanja Mahovic Poljacek, Auteur Année de publication : 2016 Article en page(s) : p. 815-828 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Encre flexographique Essais (technologie) Flexographie Matériaux -- Propriétés fonctionnelles Ozone Photopolymères Rayonnement ultraviolet Traîtements de surface Index. décimale : 667.9 Revêtements et enduits Résumé : Printed functional materials are a rapidly growing area of interest for low-cost high-speed device manufacture with flexographic printing seen as a route to achieving this. The relationship between surface tension of the ink and surface free energy (SFE) of the photopolymer plate is a key for optimum performance. However, traditional methods of surface tension modification of the ink/coating often cannot be employed for functional inks. In this research, rapid, permanent modification of flexographic printing plate’s SFE is achieved through controlled UV-ozone treatment, and the effects of the treatment on the polar and dispersive component of SFE are analyzed by Fourier transform infrared attenuated total reflectance spectroscopy, swelling experiments, and roughness measurements. Printing trials using the modified printing plates reveal improved print uniformity and control of deposited ink layer thickness, as well as improved print features—particularly track and pad junctions which can be problematic for printed electronic applications. The ability to rapidly tailor printing plate SFE is of benefit to all volume printing applications. Furthermore, it is of critical importance for functional printing and printed electronics where surface tension of the ink is determined by the functional material and chemical modification is not possible or desirable. Note de contenu : - EXPERIMENTAL SETTINGS : Preparation of samples - Measurements and analysis methods - RESULTS : Hardness of the printing plate - Surface free energy results - Roughness of the UV-ozone treated samples - FTIR ATR analysis - Swelling of the UV-ozone-treated photopolymer - Test prints DOI : 10.1007/s11998-016-9794-4 En ligne : http://link.springer.com/content/pdf/10.1007%2Fs11998-016-9794-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27121 [article]

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Application of fringe field capacitance sensor for the study of water permeation in organic coatings / K. A. Thomas in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 829-835 Titre : Application of fringe field capacitance sensor for the study of water permeation in organic coatings Type de document : texte imprimé Auteurs : K. A. Thomas, Auteur ; Shiny Nair, Auteur ; A. V. Ramesh Kumar, Auteur ; V. Natarajan, Auteur ; Reji John, Auteur Année de publication : 2016 Article en page(s) : p. 829-835 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Capteurs (technologie) Perméation Revêtements -- Analyse:Peinture -- Analyse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Water permeation in organic coatings can be monitored by measuring the capacitance change in coatings. A new method of measuring water content in organic coatings using a miniature fringe field capacitance (FFC) sensor is described in this paper. The FFC sensor comprises two planar interdigitated electrodes on a dielectric substrate which is connected to a measuring circuit. Coating capacitance is measured by measuring the sensor capacitance when it is in contact with the surface of the coating. Sensor capacitance is theoretically calculated based on IDC capacitor theory for various sensor geometrical parameters at different water ingression levels in the coating. The computed sensor capacitance is validated with experimental values of five miniature sensors which are fabricated by lithography. The calibrated FFC sensor is used to monitor the water permeation profile in the coating, and the results are compared with that of electrochemical impedance spectroscopy technique. The technique provides scope for developing a portable, hand-held, and noninvasive technique to measure water permeation in organic coatings in the field. Note de contenu : - APPLICATION OF FFC SENSOR FOR MEASURING WATER CONTENT IN THE COATING : THEORETICAL STUDY - FABRICATION OF SENSOR AND VALIDATION OF THEORY : Sensor fabrication - Experimental validation of theory - WATER PERMEATION STUDY IN THE COATING DOI : 10.1007/s11998-016-9795-3 En ligne : http://link.springer.com/content/pdf/10.1007%2Fs11998-016-9795-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27122 [article]

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The formation and corrosion behavior of a zirconium-based conversion coating on the aluminum alloy AA6061 / Dongdong Peng in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 837-850 Titre : The formation and corrosion behavior of a zirconium-based conversion coating on the aluminum alloy AA6061 Type de document : texte imprimé Auteurs : Dongdong Peng, Auteur ; Junsheng Wu, Auteur ; Xiaoli Yan, Auteur ; Xiaoqiong Du, Auteur ; Yueying Yan, Auteur ; Xiaogang Li, Auteur Année de publication : 2016 Article en page(s) : p. 837-850 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium -- Alliages Anticorrosion Corrosion par piqure Electrochimie Essais accélérés (technologie) Métaux -- Revêtements protecteurs Revêtement métallique Zirconium Index. décimale : 667.9 Revêtements et enduits Résumé : To understand the mechanism of the coating formation, the formation process of a zirconium-based conversion coating on aluminum alloy 6061 has been studied by means of AFM in PeakForce Kelvin Probe Force Microscope (PF-KPFM) mode which could provide direct evidence for the existence of driving force for the film formation. In addition, various techniques including SEM, XPS, EIS, salt spray test, and scanning electrochemical microscope were used to investigate the surface state and corrosion behavior of the conversion film. The direct driving force for the coating formation is the Volta potential difference between the intermetallic particles and matrix. That difference produces an ocean of micro electrochemical cells in which the intermetallic particles act as cathodic sites for the film deposition. However, the precipitation of the layer is a self-limited process in which the driving force gradually decreases as the conversion layer covers the surface of the aluminum alloys. The anti-corrosion performance of the film is unfavorable compared to the conventional chromate conversion coatings due to the pitting corrosion that occurs when exposed to harsh environment containing chloride. Furthermore, the zirconium-based conversion coating possesses no self-healing ability leading to the continuous degradation of the film until it completely lose efficacy. Note de contenu : - EXPERIMENTAL : Materials and surface pre-treatment - Surface characterization - Electrochemical measurements - Salt spray test - Scanning electrochemical measurement - RESULTS AND DISCUSSION : The formation process of the conversion - Optimization of practical parameters for better corrosion-resistant properties of the conversion coating - Corrosion behavior of the conversion film fabricated in optimal practical parameters DOI : 10.1007/s11998-016-9789-1 En ligne : http://link.springer.com/content/pdf/10.1007%2Fs11998-016-9789-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27123 [article]

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Reaction of fluorinated aliphatic alcohols with calcium chloride: formation of the fluorinated alcohol/calcium fluoride nanocomposites—thermal stability and application to the surface modification of these nanocomposites / Tomoya Saito in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 851-861 Titre : Reaction of fluorinated aliphatic alcohols with calcium chloride: formation of the fluorinated alcohol/calcium fluoride nanocomposites—thermal stability and application to the surface modification of these nanocomposites Type de document : texte imprimé Auteurs : Tomoya Saito, Auteur ; Shohei Yamazaki, Auteur ; Yusei Tsushima, Auteur ; Katsuyuki Sato, Auteur ; Hideo Sawada, Auteur Année de publication : 2016 Article en page(s) : p. 851-861 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alcools Chlorure de calcium Composés aliphatiques Composés fluorés Fluorure de calcium Matériaux hybrides Stabilité thermique Traîtements de surface Index. décimale : 667.9 Revêtements et enduits Résumé : A variety of fluorinated aliphatic alcohols such as 1H,1H,2H,2H-nonafluoro-1-hexanol (FA-4), 1H,1H,2H,2H-tridecafluoro-1-n-octanol (FA-6), 1H,1H,2H,2H-heptadecafluoro-1-decanol (FA-8), 1H,1H,2H,2H,6H,6H-nonadecafluoro-1-undecanol (DTFA), 2,3,3,3-tetrafluoro-2-[1,1,2,3,3,3-hexafluoro-2-(heptafluoropropoxy) propoxy]-1-propanol (PO-3-OH), and 2,4,4,5,7,7,8,10,10,11,13,13,14,16,16,17,17,18,18,18-icosafluoro-2,5,8,11,14-pentakis(trifluoromethyl)-3,6,9,12,15-pentaoxaoctadecane-1-ol (PO-6-OH) were applied to the reaction with calcium chloride under alkaline conditions. In these fluorinated alcohols, only the DTFA can react with calcium chloride under alkaline conditions to provide the corresponding fluorinated alcohol/calcium fluoride nanocomposites. This reactivity is due to the relatively higher acidity of the inside methylene unit in the DTFA, whose acidic protons should react with the neighboring fluorines and successively with calcium chloride under alkaline conditions to afford the DTFA/calcium fluoride nanocomposites. Interestingly, the DTFA/CaF2 nanocomposites were found to exhibit a no weight loss characteristic even after calcination at 800°C. More interestingly, the DTFA/CaF2 nanocomposites after calcination at 800°C are applicable to the surface modification of poly(methyl methacrylate) (PMMA) to exhibit both good oleophobicity and lower refractive indices imparted by longer fluoroalkyl units in the composites on the modified PMMA film surfaces, as well as those before calcination of the DTFA/CaF2 nanocomposites. DOI : 10.1007/s11998-016-9797-1 En ligne : http://link.springer.com/content/pdf/10.1007%2Fs11998-016-9797-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27124 [article]

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The effects of surface roughness on varnish adhesion strength of wood materials / Cevdet Sögütlü in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 863-870 Titre : The effects of surface roughness on varnish adhesion strength of wood materials Type de document : texte imprimé Auteurs : Cevdet Sögütlü, Auteur ; Pascal Nzokou, Auteur ; Ismail Koc, Auteur ; Rahmi Tutgun, Auteur ; Nihat Döngel, Auteur Année de publication : 2016 Article en page(s) : p. 863-870 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Bois Essais dynamiques Ponçage Vernis Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, the effects of surface roughness of wood material on the adhesion strength of varnish layers have been tested. For this purpose, test samples of beech (Fagus orientalis L.), Scots pine (Pinus sylvestris L.), and cherry (Prunus cerasus) wood species were prepared and sanded with 80, 120, and 180 grit abrasives. The surface roughness values of specimens were determined using a stylus-type profilometer TIME TR 200 according to the ISO 4287 standards. Then, water-based, polyurethane, and acrylic varnish were applied to the surfaces of the samples in accordance with ASTM-D 3023. Layer adhesion strength was determined to the TS EN ISO 4624 standards. As a result, the highest adhesion strength value (2.52 N/mm2) was found in cherry, while the Scots pine had the lowest value (2.32 N/mm2). For the varnish types, polyurethane varnish types gave the highest value (3.15 N/mm2), while the lowest value was obtained from the water-based varnish. Looking at interactions between adhesion strength and surface roughness, the water-based varnish had the strongest correlation with adhesion strength (69%) and acrylic varnish also had a similar result (67%), while polyurethane varnish had the weakest result (33%) in this interaction. DOI : 10.1007/s11998-016-9805-5 En ligne : http://link.springer.com/content/pdf/10.1007%2Fs11998-016-9805-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27125 [article]

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Colorimetric analysis of black coated fabrics / R. Jafari in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 871-882 Titre : Colorimetric analysis of black coated fabrics Type de document : texte imprimé Auteurs : R. Jafari, Auteur ; Seyed Hossein Amirshahi, Auteur ; S. A. Hosseini Ravandi, Auteur Année de publication : 2016 Article en page(s) : p. 871-882 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Colorimétrie Enduction textile Noir (couleur) Pigments Teinture -- Fibres textiles vision des couleurs Index. décimale : 667.9 Revêtements et enduits Résumé : In this article, two visual evaluation methods, i.e., the rank-ordering and pair comparison techniques, are sequentially used to investigate the effect of hue, lightness, and chroma values on the preference of blackness of 216 black coated fabrics. Based on the colorimetric attributes of specimens, the blackness preference of samples is assessed by 18 amateur observers through different predesigned experiments. Results show that while the lightness of samples performs a very important role in the blackness preference, it does not individually influence the results, and irrespective of the effect of chroma, observers perceive bluish-cyanish black fabrics as the preferred black samples. However, the specialized functionality of lightness is evident for black coated fabrics with very close hue and chroma attributes, and the blackness preference of samples increases when lightness is decreased. Finally, the validity of some suggested blackness indices is evaluated with comparison to the visual results. Note de contenu : - BLACKNESS PERCEPTION - EXPERIMENTAL : Materials - Methods - RESULTS AND DISCUSSION : Rank-ordering method - Pair comparison method - Observers performance - Evaluating the performance of suggested blackness indices DOI : 10.1007/s11998-016-9790-8 En ligne : http://link.springer.com/content/pdf/10.1007%2Fs11998-016-9790-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27126 [article]

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Electrochemical and morphological properties of zirconium conversion coating in the presence of nickel ions on galvanized steel / H. R. Asemani in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 883-894 Titre : Electrochemical and morphological properties of zirconium conversion coating in the presence of nickel ions on galvanized steel Type de document : texte imprimé Auteurs : H. R. Asemani, Auteur ; A. A. Sarabi, Auteur ; H. Eivaz Mohammadloo, Auteur ; M. Sarayloo, Auteur Année de publication : 2016 Article en page(s) : p. 883-894 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. Adhésion Electrochimie Epoxydes Ions métalliques Métaux -- Revêtements protecteurs Nickel Le nickel est un élément chimique, de symbole Ni et de numéro atomique 28. Le nickel est un métal blanc argenté qui possède un éclat poli. Il fait partie du groupe du fer. C'est un métal ductile (malléable). On le trouve sous forme combinée au soufre dans la millérite, à l'arsenic dans la nickéline. Grâce à sa résistance à l'oxydation et à la corrosion, il est utilisé dans les pièces de monnaie, pour le plaquage du fer, du cuivre, du laiton, dans certaines combinaisons chimiques et dans certains alliages. Il est ferromagnétique, et est fréquemment accompagné de cobalt. Il est particulièrement apprécié pour les alliages qu'il forme. Revêtement métallique Spectroscopie de perte d'énergie des électrons Index. décimale : 667.9 Revêtements et enduits Résumé : A hexafluorozirconic acid-based conversion coating was applied on a galvanized steel substrate and the influence of nickel ion from nickel sulfate solution (in zirconium solution and in a separate solution) on the corrosion resistance behavior and morphology of zirconium conversion coating was investigated. Electrochemical impedance spectroscopy and DC polarization were conducted in 3.5 wt% NaCl solution in order to optimize practical conditions of zirconium conversion coating and NiSO4 solution on the galvanized steel substrate. Field emission scanning electron microscopy and X-ray photoelectron spectroscopy were employed to study the morphology and composition of the coated surfaces. Results revealed that the conversion coating obtained from solution containing zirconium and nickel ions (Zr + Ni) did not improve corrosion resistance and uniformity of the coating in comparison with Zr conversion coating in optimized condition. However, a positive effect was obtained from samples coated with separate solutions of zirconium and nickel (Zr–Ni). Improved corrosion resistance and morphology of Zr-based conversion coating were observed in Ni2+ concentration, pH, and immersion time of 10 g/L, 6 and 300 s, respectively. Morphology and surface composition analysis proved that two separate layers of conversion coating containing zirconium, zinc, and nickel oxide/hydroxide compounds were formed in the case samples that were treated by separate solutions. This led to better uniformity and higher thickness of the coating. Finally, adhesion strength of epoxy organic coating on galvanized steel with and without conversion coating was investigated by pull-off measurement. Zr–Ni conversion coating in optimum conditions had a positive effect on adhesion of organic coating in comparison with blank sample and samples pretreated with Zr and Zr + Ni conversion coatings through increased surface roughness and physical interlocking. Note de contenu : - EXPERIMENTAL : Materials - Preparation of conversion coating solutions - Test methods - RESULTS AND DISCUSSION : Electrochemical measurements - Morphology and surface composition analysis - Interaction with organic coating DOI : 10.1007/s11998-016-9800-x En ligne : http://link.springer.com/content/pdf/10.1007%2Fs11998-016-9800-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27127 [article]

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Electrochemical impedance study for modeling the anticorrosive performance of coatings based on accelerated tests and outdoor exposures / Franky E. Bedoya in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 895-904 Titre : Electrochemical impedance study for modeling the anticorrosive performance of coatings based on accelerated tests and outdoor exposures Type de document : texte imprimé Auteurs : Franky E. Bedoya, Auteur ; Ángela Bermudez, Auteur ; Juan G. Castano, Auteur ; Félix Echeverría, Auteur ; Jorge A. Calderón, Auteur Année de publication : 2016 Article en page(s) : p. 895-904 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Corrosion Essais accélérés (technologie) Prévision, Théorie de la Revêtements organiques Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, the atmospheric corrosive protection characteristics of four organic coatings were modeled based on the evolution of low-frequency impedance (|Z|ω→0) over time when subjected to accelerated tests and outdoor exposures. Environmental characteristics such as the time of wetness, chloride and sulfate depositions, and ultraviolet radiation were defined as explanatory variables. The results obtained helped to establish a relationship between |Z|ω→0, acquired from electrochemical impedance spectra, and the explanatory variables. An adjustment factor was calculated for each coating against the most aggressive natural exposure, resulting in a good prediction of |Z|ω→0 and the performance of the coatings for other outdoor tests. Note de contenu : - MATERIALS AND METHODS : Accelerated tests - Natural outdoor tests - Accelerated outdoor tests - Atmospheric characterization for outdoor tests - Electrochemical cell parameters for EIS measurements - THEORETICAL TREATMENT - RESULTS AND DISCUSSION : Accelerated test predictors - Outdoor test predictors - Estimation of coefficients from the accelerated tests measurements - Prediction of impedance modules for outdoor exposures - Estimation of failure times DOI : 10.1007/s11998-016-9803-7 En ligne : http://link.springer.com/content/pdf/10.1007%2Fs11998-016-9803-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27128 [article]

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Self-cleaning performance of sol–gel-derived TiO2/SiO2 double-layer thin films / Byeong-Min Kim in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 905-910 Titre : Self-cleaning performance of sol–gel-derived TiO2/SiO2 double-layer thin films Type de document : texte imprimé Auteurs : Byeong-Min Kim, Auteur ; Hemraj M. Yadav, Auteur ; Jung-Sik Kim, Auteur Année de publication : 2016 Article en page(s) : p. 905-910 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bleu de méthylène Couches minces multicouches Dioxyde de silicium Dioxyde de titane Photocatalyse Revêtement auto-nettoyant:Peinture auto-nettoyante Sol-gel, Procédé Index. décimale : 667.9 Revêtements et enduits Résumé : The self-cleaning properties of the TiO2/SiO2 double-layer films prepared by sol–gel method were investigated. Thin films were prepared by spin coating onto glass and then thermally treated at different temperatures, and characterized using X-ray diffraction, atomic force microscopy, field emission scanning electron microscopy, and UV–visible spectroscopy. The cross-sectional structure of the films was observed by FESEM. The surface roughness of the films was characterized by AFM. The root mean square surface roughness of the thin films was below 2 nm, which should enhance their optical transparency. The photo-induced hydrophilicity of the films was evaluated by water contact angle measurement in air. The photocatalytic activity of the films was studied by the photocatalytic degradation of methylene blue under UV light irradiations. The TiO2/SiO2 double-layer thin films are plausibly applicable to developing self-cleaning materials in various applications such as windows, solar panels, cement, and paints. Note de contenu : - EXPERIMENTAL : Characterizations - Photocatalytic reaction - RESULTS AND DISCUSSION : XRD - FESEM - UV-Vis spectroscopy - AFM - Photo-induced hydrophilicity - PHOTOCATALYTIC ACTIVITY DOI : 10.1007/s11998-016-9804-6 En ligne : http://link.springer.com/content/pdf/10.1007%2Fs11998-016-9804-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27129 [article]

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The impact of solvent characteristics on performance and process stability of printed carbon resistive materials / Bruce Philip in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 911-920 Titre : The impact of solvent characteristics on performance and process stability of printed carbon resistive materials Type de document : texte imprimé Auteurs : Bruce Philip, Auteur ; Eifion Jewell, Auteur ; David Worsley, Auteur Année de publication : 2016 Article en page(s) : p. 911-920 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Conducteurs organiques Couches minces Graphite Noir de carbone Résistance chimique Revêtement -- Séchage solvants Index. décimale : 667.9 Revêtements et enduits Résumé : Carbon conductive pastes deposited by screen printing are used in many commercial applications including sensors, PCB, batteries, and PV, and as such represent an important value-added coating. An experimental investigation was carried out into the role of the solvent on the drying characteristics, conductivity, and process consistency in screen printed carbon pastes. Four materials with solvent boiling points between 166 and 219°C were deposited at film thickness between 6 and 16 μm, and the sheet resistance and film thickness were measured after successive passes through an industrial dryer operating with an air temperature of 155°C. Sheet resistances of 14 Ω/sq. were obtained with the thicker films while thinner films produced a sheet resistance of 46 Ω/sq. Thinner films achieved a stable resistivity within a 2.5-min residence time, while the thicker films required a residence time in excess of 12.5 min to achieve a stable resistivity. As well as prolonging drying times, the higher boiling point increased the resistivity of the cured film. It is postulated that the lower resistance of the faster drying materials is a result of film stressing increasing inter particle contact. Process models indicate that multiple thin layers are a more efficient means of manufacture for the process parameters examined. Note de contenu : - MATERIALS AND METHODS : Material preparation and characterization - Coating deposition - Film characterization - RESULTS : Drying characteristics - Solvent impact on process consistency DOI : 10.1007/s11998-016-9802-8 En ligne : http://link.springer.com/content/pdf/10.1007%2Fs11998-016-9802-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27130 [article]

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Formulation and characterization of hybrid polymeric/ZnO nanocomposite coatings with remarkable anti-corrosion and hydrophobic characteristics / Sh. Ammar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 921-930 Titre : Formulation and characterization of hybrid polymeric/ZnO nanocomposite coatings with remarkable anti-corrosion and hydrophobic characteristics Type de document : texte imprimé Auteurs : Sh. Ammar, Auteur ; K. Ramesh, Auteur ; B. Vengadaesvaran, Auteur ; S. Ramesh, Auteur ; A. K. Arof, Auteur Année de publication : 2016 Article en page(s) : p. 921-930 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion Caractérisation Hydrophobie Matériaux hybrides Morphologie (matériaux) Nanoparticules Oxyde de zinc Polyacryliques Revêtements protecteurs Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : A simple chemical technique has been used to prepare core–shell extender pigments based on Nigerian indigenous clays as core and titanium dioxide as shell. The prepared core–shell extender pigments were characterized using X-ray fluorescence and scanning electron microscopy. The physico-chemical properties of these extender pigments were also evaluated according to ASTM measurements. The study showed that the prepared core–shell pigments were nontoxic and environmentally friendly. They are of low cost and can be incorporated in semi-gloss paints, paper, rubber, and plastic composites without much effect on the volume. The characteristics of these pigments showed that they combine the properties of both their precursors, and have the potential to overcome their disadvantages, e.g., low hiding power of clays and photochemical activity of titanium dioxide. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Materials and sample preparation - Characterization - RESULTS AND DISCUSSION : Fourier transform infrared spectroscopy (FTIR) - Morphological studies (FESEM and EDX) - Contact angle (CA) - Electrochemical impedance spectroscopy (EIS) DOI : 10.1007/s11998-016-9799-z En ligne : http://link.springer.com/content/pdf/10.1007%2Fs11998-016-9799-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27131 [article]

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Synthesis and characterization of local clay–titanium dioxide core–shell extender pigments / C. M. Ewulonu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 931-940 Titre : Synthesis and characterization of local clay–titanium dioxide core–shell extender pigments Type de document : texte imprimé Auteurs : C. M. Ewulonu, Auteur ; I. O. Igwe, Auteur ; G. N. Onyeagoro, Auteur Année de publication : 2016 Article en page(s) : p. 931-940 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Argile Charges (matériaux) Core-Shell Dioxyde de titane Kaolin Pigments -- Synthèse Index. décimale : 667.9 Revêtements et enduits Résumé : A simple chemical technique has been used to prepare core–shell extender pigments based on Nigerian indigenous clays as core and titanium dioxide as shell. The prepared core–shell extender pigments were characterized using X-ray fluorescence and scanning electron microscopy. The physico-chemical properties of these extender pigments were also evaluated according to ASTM measurements. The study showed that the prepared core–shell pigments were nontoxic and environmentally friendly. They are of low cost and can be incorporated in semi-gloss paints, paper, rubber, and plastic composites without much effect on the volume. The characteristics of these pigments showed that they combine the properties of both their precursors, and have the potential to overcome their disadvantages, e.g., low hiding power of clays and photochemical activity of titanium dioxide. Note de contenu : - MATERIALS AND METHODS : Materials - Particle size analysis - Preparation of core-shell extender pigments - Characterization of prepared extender pigments - RESULTS AND DISCUSSION : Pigment chemical composition and morphology - Extender properties DOI : 10.1007/s11998-016-9786-4 En ligne : http://link.springer.com/content/pdf/10.1007%2Fs11998-016-9786-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27132 [article]

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