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Nanoparticulate inorganic UV absorbers : a review / Igor Fajzulin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 4 (07/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 4 (07/2015) . - p. 617-632 Titre : Nanoparticulate inorganic UV absorbers : a review Type de document : texte imprimé Auteurs : Igor Fajzulin, Auteur ; Xiaomin Zhu, Auteur ; Martin Möller, Auteur Année de publication : 2015 Article en page(s) : p. 617-632 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorbeurs de rayonnement ultraviolet Composés inorganiques -- Synthèse Dioxyde de titane Nanoparticules Nanoparticules -- Synthèse Oxyde de cérium Oxyde de fer Oxyde de zinc Oxyhydroxyde de fer (III) L’oxyhydroxyde de fer(III) est un composé chimique de formule FeO(OH) sous forme anhydre. Il s'agit d'un oxyde hydroxyde de fer à l'état d'oxydation +3. Il existe également sous forme hydratée FeO(OH)·nH2O ; le monohydrate FeO(OH)·H2O peut également être décrit comme l'hydroxyde de fer(III) Fe(OH)3, et est également appelé oxyde de fer hydraté ou oxyde de fer jaune. L'oxyhydroxyde de fer(III) existe sous plusieurs formes minérales : goethite α-FeO(OH), de structure orthorhombique, akaganéite ß-FeO1-a(OH)1+aXa, où X est souvent un ion chlorure Cl-, lépidocrocite γ-FeO(OH), assez rare dans le milieu naturel, feroxyhyte δ-FeO(OH), variété de haute pression qu'on trouve notamment au fond des océans, limonite, agrégat microcristallin d'oxydes et d'hydroxydes de fer hydratés, composant principal du chapeau de fer. Protection contre le rayonnement ultraviolet Index. décimale : 667.9 Revêtements et enduits Résumé : Inorganic nanoparticles with UV-absorbing properties are an important class of UV filters. They can be used in various applications and in a variety of forms, including suspensions, nanocomposites, and solid thin films. In this review, an overview of the synthetic methods and their respective products is given for the most popular UV-absorbing nanomaterials, including zinc oxide, titanium dioxide, cerium dioxide and ferrous oxides, and oxyhydroxides. Note de contenu : - CURRENT APPLICATIONS OF NANOPARTICLES IN COATINGS - NANOPARTICLES AS UV ABSORBERS AND THEIR ECOLOGICAL AND TOXICOLOGICAL RISKS - SYNTHESIS METHODS FOR ZINC OXIDE : Mechanomechanical methods - Sol-gel methods - High-temperature methods - SYNTHESIS METHODS FOR TITANIUM DIOXIDE - SYNTHESIS METHODS FOR CERIUM(IV) OXIDE : Solution combustion, spray pyrolysis, and high-temperature decomposition - Water-based chemical methods - SYNTHESIS METHODS FOR IRON OXIDES AND HYDROXYDES - STRATEGIES FOR THE REDUCTION OF PHOTOCATALYTIC ACTIVITY DOI : 10.1007/s11998-015-9683-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9683-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24395 [article]

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Novel alkyd-type coating resins produced using cationic polymerization / Samim Alam in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 4 (07/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 4 (07/2015) . - p. 633-646 Titre : Novel alkyd-type coating resins produced using cationic polymerization Type de document : texte imprimé Auteurs : Samim Alam, Auteur ; Deep Kalita, Auteur ; Anurad Jayasooriyamu, Auteur ; Shashi Fernando, Auteur ; Sathyabrata Samanta, Auteur ; James Bahr, Auteur ; Sermadurai Selvakumar, Auteur ; Mukund Sibi, Auteur ; Jessica Vold, Auteur ; Chad Ulven, Auteur ; Bret J. Chisholm, Auteur Année de publication : 2015 Article en page(s) : p. 633-646 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cyclohexyl vinyle ether Huile de soja Oxydation Polyaddition Polyvinyl éther Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : Novel, partially bio-based poly(vinyl ether) copolymers derived from soybean oil and cyclohexyl vinyl ether (CHVE) were produced by cationic polymerization and investigated for application as alkyd-type surface coatings. Three different polymers were produced and cured clear coatings and free films characterized as a function of CHVE comonomer content and curing conditions. CHVE comonomer content was varied at 0, 25, and 50 wt%, and the three different curing conditions were 1 week at room temperature, 120°C for 1 h, and 150°C for 1 h. The results of the study showed that the thermal, mechanical, and physical properties of the coatings produced from these novel polymers varied considerably as a function of polymer composition and cure temperature. Overall, the results suggest a good potential for these novel copolymers to be used for coatings cured by autoxidation. Compared to conventional alkyd resins, which are produced by high temperature melt condensation polymerization, these poly(vinyl ether)s provide several advantages. These advantages include milder, more energy efficient polymer synthesis, elimination of issues associated with gelation during polymer synthesis, production of polymers with well-defined composition and relatively narrow molecular weight distribution, and elimination of film formation and physical property issues associated with entrained monomers, dimers, trimers, etc. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of homopolymers and copolymers of 2-VOES and CHVE - Preparation of free films and coated panels - Methods - Instrumentation - RESULTS AND DISCUSSION : Synthesis and characterization of poly(2-VOES-co-CHVE) copolymers - Viscoelastic properties and gel content of cured films - Mechanical properties of cured films - Properties of coated substrates DOI : 10.1007/s11998-015-9667-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9667-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24396 [article]

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Characterization of cellulose nanocrystals dispersion in varnishes by backscattering of laser light in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 4 (07/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 4 (07/2015) . - p. 647-656 Titre : Characterization of cellulose nanocrystals dispersion in varnishes by backscattering of laser light Type de document : texte imprimé Année de publication : 2015 Article en page(s) : p. 647-656 Note générale : Bibliogr. Langues : Américain (ame) Catégories : 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. Cristaux Dispersions et suspensions Nanoparticules Polymères -- Propriétés optiques Polymères en émulsion Résistance au rayonnement ultraviolet Revêtements -- Propriétés optiques:Peinture -- Propriétés optiques Rugosité Vernis en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : Cellulose nanocrystals were mixed into an aqueous UV-cured coating formulation in order to improve the mechanical properties of the coating. One of the key aspects in the technology of nanocomposites remains the dispersion of the nanoparticles within the matrix. To quantify the dispersion, efficient methods of characterization are needed. In this study, a new characterization method based on atomic force microscopy (AFM) and backscattering of laser light (He–Ne 632.8 nm) is applied to characterize such nanocomposite coatings. The angular distribution of backscattered light intensity was approximated by Gaussian distribution, and its standard deviation was used for the surface roughness analyses. A strong correlation between surface nano-roughness of coatings and angular distribution (half-width of the angular spread) of backscattered laser light was found. This laser characterization is faster and may be done without direct contact over a wider surface than AFM and may give us an idea about mechanical properties of coatings. This method can advance our fundamental understanding of dispersion of the nanoparticles in coatings and could be of use in quality control in industry. DOI : 10.1007/s11998-015-9673-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9673-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24397 [article]

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Highly dispersive waterborne polyurethane/ZnO nanocomposites for corrosion protection / Manickam Anbu Kulandainathan ; Gurusamy Harichandran in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 4 (07/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 4 (07/2015) . - p. 657-667 Titre : Highly dispersive waterborne polyurethane/ZnO nanocomposites for corrosion protection Type de document : texte imprimé Auteurs : Manickam Anbu Kulandainathan, Auteur ; Gurusamy Harichandran, Auteur Année de publication : 2015 Article en page(s) : p. 657-667 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion Métaux -- Revêtements protecteurs Nanoparticules Oxyde de zinc Polyuréthanes Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : The interfacial interactions between surface-modified zinc oxide with oleic acid (OA-ZnO) and polymer matrix have important effects on the properties of nanocomposites. This zinc oxide nanoparticle was synthesized and characterized by various techniques such as field emission scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. The water contact angle of waterborne polyurethane (WPU) nanocomposites is found to be increased with the addition of OA-ZnO compared with pure WPU. The corrosion protection of the polyurethane nanocomposites coatings on mild steel was assessed by potentiodynamic polarization and electrochemical impedance spectroscopy techniques. Coating with OA-ZnO in the WPU matrix showed the enhancement of resistance of mild steel to corrosion. This can be related to the surface modification by oleic acid which enhances the dispersion of nano-ZnO and improves the corrosion resistance of the WPU coating. Compared with unmodified ZnO nanoparticles, there were noticeable improvements in the hydrophobicity, corrosion protection, and uniform dispersion without agglomeration, and also improvement in the antisettling behavior when surface-modified ZnO nanoparticles with oleic acid (OA-ZnO) were used. Note de contenu : MATERIALS AND METHODS : Raw materials - Synthesis of nano-ZnO and surface-modified nano-ZnO - Preparation of nanocomposite coatings - Characterization methods - Electrochemical impedance spectroscopy - RESULTS AND DISCUSSION : Surface morphology of ZnO nanoparticles - Microstructure analysis - XRD patterns - Fourier transform infrared (FTIR) spectra - Contact angle measurements - Nanoparticle polymer dispersion - Lipophilic degree of OA-ZnO - Electrochemical corrosion studies DOI : 10.1007/s11998-015-9674-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9674-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24401 [article]

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A moisture-absorbing and abrasion-resistant transparent coating on polystyrene / Svenja Grube in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 4 (07/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 4 (07/2015) . - p. 669-680 Titre : A moisture-absorbing and abrasion-resistant transparent coating on polystyrene Type de document : texte imprimé Auteurs : Svenja Grube, Auteur ; Konstantin Siegmann, Auteur ; Martina Hirayama, Auteur Année de publication : 2015 Article en page(s) : p. 669-680 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Abrasion Gonflement (physique) Humidité -- Absorption Matières plastiques -- Revêtements protecteurs Polystyrène Polyvinylpyrrolidone Résistance à l'abrasion Revêtements antigel Index. décimale : 667.9 Revêtements et enduits Résumé : A common phenomenon concerning cold surfaces which are subjected to a warmer, more humid atmosphere is condensation in the form of water droplets (fogging) or even ice crystals (icing). Thus, a previously transparent object becomes opaque because light is scattered by the droplets or crystals. This may impair the usability of that object. We developed an anti-fogging/icing coating which overcomes the problem of fogging and icing by being able to absorb the condensing water and preventing it from crystallizing. The coating consists of poly(1-vinyl-2-pyrrolidone) (PVP) crosslinked by UV light using hydrogen peroxide (H2O2). Benzophenone (BP) is used to attach PVP to the surface of the polystyrene (PS) substrate. At temperatures as low as -60°C, the PVP coating can absorb up to 70 wt% of water and still inhibit its crystallization. However, at surface temperatures of around -18°C, opacity is only observable at 150 wt% of absorbed water and higher. An increasing coating thickness as well as a decreasing crosslink density improves the anti-fogging/icing effect because the coating can absorb more water. The abrasion resistance of the coating is impaired by a decreasing crosslink density. Note de contenu : - MATERIALS AND METHODS : Coatings process - Characterization of the coatings - RESULTS AND DISCUSSION : Coating mechanism - Absorption and swelling - Non-freezing water - Influence of coating thickness on anti-fog performance under icing conditions occuring in practice - Water absorption and abrasion testing DOI : 10.1007/s11998-015-9678-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9678-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24402 [article]

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Nanolayer atmospheric pressure plasma graft polymerization of durable repellent finishes on cotton / Ahmed El-Shafei in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 4 (07/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 4 (07/2015) . - p. 681-691 Titre : Nanolayer atmospheric pressure plasma graft polymerization of durable repellent finishes on cotton Type de document : texte imprimé Auteurs : Ahmed El-Shafei, Auteur ; Hany Helmy, Auteur ; Amsarani Ramamoorthy, Auteur ; Peter Hauser, Auteur Année de publication : 2015 Article en page(s) : p. 681-691 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Copolymères greffés Coton Le coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles). Couches minces Nanotechnologie Oléofugation Plasma à pression atmosphérique Un plasma à pression atmosphérique (ou plasma à PA ou plasma froid) est le nom donné à une catégorie spéciale de plasma pour lequel la pression approche celle de l’atmosphère. Le plasma à pression atmosphérique marque une nette différence avec le plasma basse et haute pression. En effet, contrairement à ces derniers aucune enceinte de traitement n'est nécessaire. Ce type de plasma peut donc être utilisé directement sur ligne de production, évitant ainsi l'utilisation de vide qui est extrêmement onéreuse. Textiles et tissus -- Finition Index. décimale : 667.9 Revêtements et enduits Résumé : High-density, non-thermal, glow-discharge atmospheric-pressure plasma was used for graft polymerization of a vapor deposited fluorocarbon mixture of 1,1,2,2-tetrahydroperfluorodecyl acrylate and 1,1,2,2-tetrahydroperfluorododecyl acrylate on undyed cotton fabrics, which furnished a highly durable nanolayer water and oil repellent finish. In this study, monomer vapor was deposited onto cotton fabrics on single and double sides of the fabrics. The influence of monomer flow rate and plasma preactivation was studied. The surface of the cotton treated with fluorocarbons is evaluated using the standard AATCC Test Methods. Surface chemistry and morphology of the treated cotton were characterized using FTIR, XPS, SEM, and TOF–SIMS. Plasma-assisted graft polymerization of fluorocarbon in the presence of the crosslinker pentaerythritol triacrylate (10:1 molar ratio of monomer: crosslinker) resulted in a polyfluorocarbon nanolayer on cotton, which was hydrophobic and durable to one accelerated laundering, which is equivalent to 10 home launderings. Note de contenu : - EXPERIMENTAL : Materials and chemicals - Atmospheric pressure plasma jet system (APJeT) - Undyed fabric one-sided treatment - Test methods - Film thickness measurements using field emission SEM - FTIR/ATR measurements - XPS (X-ray photoelectron spectroscopy) - Time-of-flight secondary ion mass spectrometry (TOF-SIMS) - RESULTS AND DISCUSSION : One-side treatment - Double-sided cotton treatment with THPFDA DOI : 10.1007/s11998-015-9665-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9665-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24403 [article]

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Theoretical study and experimental analysis of the scattering efficiency of hollow polymer particles in the dependent light scattering regime / J.-C. Auger in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 4 (07/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 4 (07/2015) . - p. 693-709 Titre : Theoretical study and experimental analysis of the scattering efficiency of hollow polymer particles in the dependent light scattering regime Type de document : texte imprimé Auteurs : J.-C. Auger, Auteur ; Daragh Mcloughlin, Auteur Année de publication : 2015 Article en page(s) : p. 693-709 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Corps creux Diffraction Lumière -- Diffusion Opacité (optique) Particules (matières) Polymères -- Propriétés optiques Revêtements:Peinture Transfert radiatif Index. décimale : 667.9 Revêtements et enduits Résumé : We present an extensive theoretical study of the optical properties of hollow polymer particles (HPP) dispersed into a polymer resin as functions of their structure and volume-filling fraction. We show that a dependent light scattering model predicts the occurrence of three different light propagation regimes, the existence of which is consistent with experimental data gathered in the literature. We then analyze the effect of the polymer shell thickness on the magnitude of the near-field and far-field dependent light scattering phenomena. We also discuss and compare the variation of the scattering efficiency of Ropaqueâ„¢, measured in our laboratory, as a function of the pigment volume-filling fraction, with dependent light scattering model. In particular, we show that in the case of HPP, quasi-linear variation of the scattering efficiency as a function of the particle volume-filling fraction is not an undeniable indication of the absence of electromagnetic couplings in the system. Finally, we used a solution of the radiative transfer equation to compare the prediction of the opacity of several simple paint films when a dependent light scattering model is used instead of the independent scattering approximation to calculate the optical properties of the films at a local scale. Note de contenu : - THEORETICAL ANALYSIS : Theoretical framework - Identification of the light scattering regimes - Optimum radius - Characterization of the type of electromagnetic couplings in the different light scattering regimes - Effect of the polymer shell's thickness - EXPERIMENTAL EVIDENCE OF HPPs' LIGHT PROPAGATION REGIMES : Origin of the experimental data - Scattering efficiency analysis procedure - Clarification of the condition at zero PVC - Results and interpretation - ANALYSIS OF ROPAQUE ULTRA TM OPTICAL PROPERTIES : Description and analysis of the experimental data - Analysis of the experimental data via the QCA - INTERPRETATION OF QUASI-LINEAR VARIATION IN TERMS OF ELECTROMAGNETIC COUPLINGS - EFFECT OF ELECTROMAGNETIC COUPLING ON MACROSCOPIC PARAMETERS DOI : 10.1007/s11998-015-9677-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9677-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24404 [article]

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Substrate vibration-assisted spray coating (SVASC) : significant improvement in nano-structure, uniformity, and conductivity of PEDOT:PSS thin films for organic solar cells / Fatemeh Zahibi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 4 (07/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 4 (07/2015) . - p. 711-719 Titre : Substrate vibration-assisted spray coating (SVASC) : significant improvement in nano-structure, uniformity, and conductivity of PEDOT:PSS thin films for organic solar cells Type de document : texte imprimé Auteurs : Fatemeh Zahibi, Auteur ; Morteza Eslamian, Auteur Année de publication : 2015 Article en page(s) : p. 711-719 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couches minces Dépôt par pulvérisation Photopiles Poly(3,4-éthylènedioxythiophène) Polystyrène sulfone Revêtements:Peinture Ultrasons Index. décimale : 667.9 Revêtements et enduits Résumé : In an attempt to improve surface wetting and coating characteristics, a novel technique, i.e., imposing ultrasonic vibration on the substrate, is introduced. This technique is combined with conventional ultrasonic spray coating, thus substrate vibration-assisted spray coating (SVASC), and is employed to fabricate PEDOT:PSS thin films. PEDOT:PSS is a co-polymer, commonly used as solar cell buffer layers and thin-film electrodes. Advanced surface characterization techniques, such as atomic force microscopy and confocal laser scanning microscopy are utilized. The results show that the application of the imposed vibration on the substrate results in a significant decrease in surface roughness, film thickness, and the number of defects and pin-holes. In terms of the film functionality, the electrical conductivity of the PEDOT:PSS films made using the SVASC technique shows a four-time increase, compared to those made by conventional ultrasonic spray coating. In conventional ultrasonic spray coating, increasing the number of spray passes or deposition layers usually improves the coating uniformity. For aqueous PEDOT:PSS solution and within the range of the values of the parameters investigated in this work, with imposed substrate vibration, the number of spray passes is immaterial, as far as the film uniformity is concerned. However, the application of multiple spray passes enhances the film’s electrical conductivity. Our unprecedented results on the combined substrate vibration with spray coating provide a platform for low-cost fabrication of solution-processed thin-film solar cell devices, and a forward step toward commercialization of emerging solar cells, such as polymer and perovskite solar cells. The positive effect of using imposed substrate vibration on spray-on solar cell thin films may be deployed in other coating (e.g., spin coating) and spray coating applications as well. DOI : 10.1007/s11998-015-9682-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9682-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24405 [article]

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Improvement of barrier properties of Cr-free pretreatments for coil-coated products / Ville Saarimaa in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 4 (07/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 4 (07/2015) . - p. 721-730 Titre : Improvement of barrier properties of Cr-free pretreatments for coil-coated products Type de document : texte imprimé Auteurs : Ville Saarimaa, Auteur ; Antti Markkula, Auteur ; Jyrki Juhanoja, Auteur ; Bengt-Johan Skrifvars, Auteur Année de publication : 2015 Article en page(s) : p. 721-730 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Coil coatings Laque et laquage Matériaux -- Propriétés barrières Peinture sur panneau Résistance à l'humidité Index. décimale : 667.9 Revêtements et enduits Résumé : Humidity resistance of pretreated and coil-coated panels was evaluated with a special emphasis on the process parameters that govern the uniformity and barrier properties of hexafluorotitanic acid-based pretreatment layers. Humidity resistance tests showed that good barrier effect was obtained with pretreatments in the coating weight range of about 2–17 mg Ti/m2. It was further verified by rinsing experiments that a fully reacted pretreatment layer is achieved at the very low end of the optimal coating weight range. Increasing the coating weight leads to the formation of precipitated, loosely bonded porous structure, which was detrimental to humidity resistance. In addition to the coating weight, the microscale pretreatment layer uniformity is of utmost importance for good barrier properties. Electron probe microanalysis measurements provide an efficient tool to assess the pretreatment layer uniformity and facilitate monitoring of process adjustments with clear correlation to humidity resistance properties of painted panels. The surface condition of the hot dip-galvanized steel and the material of the application rolls were found to strongly affect the uniformity of the pretreatment layers. Note de contenu : - EXPERIMENTAL : Materials - Sample preparation - Surface characterization - Humidity resistance testing - RESULTS AND DISCUSSION : Influence of pretreatment coating weight on humidity resistance of painted panels - Evaluation of pretreatment layer retention - SEM imaging of pretreated samples - Influence of surface cleaning on pretreatment layer formation - Influence of roll material and pressure on pretreatment layer formation DOI : 10.1007/s11998-015-9663-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9663-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24406 [article]

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Thermal analyses of dye Disperse Red 1 grafted onto silica nanoparticles / Chao-Ching Chang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 4 (07/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 4 (07/2015) . - p. 731-738 Titre : Thermal analyses of dye Disperse Red 1 grafted onto silica nanoparticles Type de document : texte imprimé Auteurs : Chao-Ching Chang, Auteur ; Feng-Hsi Huang, Auteur ; Zi-Min Lin, Auteur ; Liao-Ping Cheng, Auteur Année de publication : 2015 Article en page(s) : p. 731-738 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique Colorants Matériaux -- Détérioration Nanoparticules 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. Stabilité thermique Index. décimale : 667.9 Revêtements et enduits Résumé : Dye-grafted silica nanoparticles (GSiO2) were synthesized via a dual-step process involving, first, attachment of the organic dye Disperse Red 1 (DR1) to the coupling agent, 3-isocyanatopropyltriethoxysilane, by means of urethane bonds, and then grafting of the silylated-DR1 onto silica nanoparticles (~6 nm) prepared by hydrolysis and condensation of tetraethoxysilane in a sol–gel process. Dye-adsorbed silica nanoparticles (DSiO2) were also prepared for comparison, for which DR1 was bound only physically to silica instead of covalent bonds. The thermal behaviors of the formed GSiO2 and DSiO2 were examined by means of differential scanning calorimetry and thermal gravimetric analysis. The results showed that both the particle size and silica content have significant effects on the thermal behaviors of the dye-adsorbed and dye-grafted silica. Moreover, crystalline DR1 lost significantly its crystallinity after being adsorbed on silica, and became virtually amorphous after being grafted onto silica. The formed particles were UV-cured with a multifunctional acrylic monomer to yield color coatings on glass substrates. UV–visible spectra indicated that brightness and color saturation of the coating comprising GSiO2 could be maintained better than that comprising DSiO2 after heat treatment at 280°C. Note de contenu : - EXPERIMENTAL : Materials - Modification of the dye - Preparation of dye-grafted siilica nanoparticles - Preparation of colored coatings - Characterization - RESULTS AND DISCUSSION : Chemical analyses - Thermal analyses of the dye-adsorbed and dye-grafted silica - Thermal stability of the coatings DOI : 10.1007/s11998-015-9670-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9670-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24407 [article]

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Enhancing egyptian kaolinite via calcination and dealumination for application in paper coating / Samya El-Sherbiny in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 4 (07/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 4 (07/2015) . - p. 739-749 Titre : Enhancing egyptian kaolinite via calcination and dealumination for application in paper coating Type de document : texte imprimé Auteurs : Samya El-Sherbiny, Auteur ; Fatma A. Morsy, Auteur ; Mervat S. Hassan, Auteur ; Heba F. Mohamed, Auteur Année de publication : 2015 Article en page(s) : p. 739-749 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Calcination La calcination est une technique de préparation d'échantillon utilisée en chimie analytique qui permet de prendre en compte ce phénomène. Elle consiste à chauffer l'échantillon à haute température (typiquement 500 à 1 000 °C) sous air ou sous atmosphère neutre pour provoquer des réactions physiques et chimiques et mettre ainsi l'échantillon dans un état de référence. En effet, un certain nombre de propriétés des matériaux dépendent de la température et de l'historique de l'échantillon comme de l'humidité. La calcination permet de l'abstraire de ces effets et donc d'avoir des mesures reproductibles, de pouvoir comparer différents échantillons. En revanche, il faut être conscient que l'échantillon analysé n'est pas l'échantillon prélevé. La méthode est similaire à l'analyse des extraits secs mais utilise une température plus élevée. Kaolinite Papier et carton couché Pigments -- Propriétés optiques Index. décimale : 667.9 Revêtements et enduits Résumé : The aim of this study was to optimize the modification of Egyptian kaolinite for application in paper coating. The study focused on four modification methods; sedimentation process, chemical bleaching, calcination, and dealumination. The effect of these methods on the structure of kaolinite was studied using X-ray fluorescence (XRF), X-ray diffractometer (XRD), Fourier transform infrared spectrometer analysis, and field emission SEM. The original and modified kaolinites were applied in paper coating mixtures. The results of XRF analysis showed that the Fe2O3 and TiO2 in Egyptian kaolinite were reduced chemically via sodium dithionite from 0.41% to 0.25% and 2.20% to 2.00%, respectively. Calcination at 900°C, followed by acid activation and bleaching, showed a further decrease in Fe2O3 and TiO2 impurities to 0.012 and 1.45 (wt%), respectively. XRD results revealed that all characteristics reflection of kaolinite disappeared upon calcination. SEM investigation showed a significant reduction in kaolinite particle size. Calcination and dealumination of kaolinite did not improve coated paper roughness, while air permeance and optical properties significantly increased in comparison with commercial kaolinite. In addition, a significant improvement was observed in coated paper mechanical properties including burst, tensile strength, stretch, and tensile energy absorption with respect to original and commercial kaolinite. In contrast, the kaolinite fraction <2 µm highly improved paper gloss, print density, and print gloss, more than calcined kaolinite and its modified pigments. In conclusion, dealumination of calcined kaolinite did not show any further change in all coated paper properties compared to the calcined ones. Note de contenu : - EXPERIMENTAL : Materials - Modification of Egyptian kaolinite - Application of modified Egyptian kaolinite in paper coating - CHARACTERIZATION OF THE MODIFIED PIGMENTS AND COATED PAPER - RESULTS AND DISCUSSION : X-ray diffraction study - Coated paper specifications DOI : 10.1007/s11998-015-9672-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9672-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24408 [article]

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Influences of Cr content and heat treatment on the optical property of the green mica-nano Cr2O3 pearlescent pigment / S. A. Hassanzadeh-Tabrizi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 4 (07/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 4 (07/2015) . - p. 751-756 Titre : Influences of Cr content and heat treatment on the optical property of the green mica-nano Cr2O3 pearlescent pigment Type de document : texte imprimé Auteurs : S. A. Hassanzadeh-Tabrizi, Auteur Année de publication : 2015 Article en page(s) : p. 751-756 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Mica Nanostructures Oxydes de chrome Pigments inorganiques Pigments nacrés Index. décimale : 667.9 Revêtements et enduits Résumé : In the present work, green nano Cr2O3-coated mica pigments were prepared by homogeneous precipitation. Structure, morphology, and optical properties were investigated by X-ray diffraction, thermogravimetric and differential thermal analysis, scanning electron microscopy, and colorimetric analysis. The results showed that an amorphous coating was synthesized and crystallized to Cr2O3 after heat treatment at 800°C. Average particle size of the coating was about 100 nm. The optical properties of the final pigment depended on the Cr content and heat-treatment temperature. The pearlescent index increased as chromium nitrate content increased and then decreased. Lower calcination temperature can cause lower L* value and pearlescent index. DOI : 10.1007/s11998-015-9664-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9664-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24409 [article]

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Corrosion protective poly(aniline-co-o-anisidine) coatings onmild steel / Pritee M. Raotole in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 4 (07/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 4 (07/2015) . - p. 757-766 Titre : Corrosion protective poly(aniline-co-o-anisidine) coatings onmild steel Type de document : texte imprimé Auteurs : Pritee M. Raotole, Auteur ; Pankaj Koinkar, Auteur ; Bhavana Joshi, Auteur ; S. R. Patil, Auteur Année de publication : 2015 Article en page(s) : p. 757-766 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. Anticorrosion Conducteurs organiques Copolymérisation Electrochimie organique Métaux -- Revêtements protecteurs Voltampérométrie Index. décimale : 667.9 Revêtements et enduits Résumé : Syntheses of corrosion protective poly(aniline-co-o-anisidine) (PAOA) coatings were carried out on mild steel by the electrochemical copolymerization of aniline with o-anisidine under cyclic voltammetry conditions. An aqueous salicylate solution was used as the supporting electrolyte for the synthesis of PAOA coatings on mild steel. These coatings were characterized with cyclic voltammetry, ultraviolet–visible absorption spectroscopy, Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance spectroscopy (NMR), and scanning electron microscopy. The FTIR and 1H-NMR spectroscopy studies reveal that during copolymerization of aniline and o-anisidine, there are more o-anisidine units than aniline units in PAOA copolymer. The corrosion protection offered by PAOA coatings to mild steel was investigated in aqueous 3% NaCl solutions using the potentiodynamic polarization technique. The results of the potentiodynamic polarization measurements showed that the PAOA coatings provided more effective corrosion protection to mild steel than the respective homopolymers. The corrosion rate was observed to be dependent on the feed ratio of o-anisidine used for synthesis of the copolymer coatings. Note de contenu : - EXPERIMENTAL PROCEDURE : Materials - Substrate preparation - Electrochemical synthesis - PAOA copolymer coatings on mild steel - Characterization of the coatings - Study of corrosion protection performance - RESULTS AND DISCUSSION : PAOA copolymer coatings on mild steel - FTIR spectroscopy results - NMR spectroscopy results - UV-visible absorption spectroscopy results - SEM results - Evaluation of corrosion protection performance - Open circuit potential DOI : 10.1007/s11998-015-9669-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9669-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24410 [article]

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Preparation of tough silicon-oxo coatings with enhanced hardness from moisture-curable polysiloxane and silica alcosol / Ting He in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 4 (07/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 4 (07/2015) . - p. 767-776 Titre : Preparation of tough silicon-oxo coatings with enhanced hardness from moisture-curable polysiloxane and silica alcosol Type de document : texte imprimé Auteurs : Ting He, Auteur ; Shuxue Zhou, Auteur Année de publication : 2015 Article en page(s) : p. 767-776 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Gel de silice Matériaux hybrides Revêtements -- Propriétés mécaniques 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). Sol-gel, Procédé Index. décimale : 667.9 Revêtements et enduits Résumé : Hardness and toughness are typically contradictive for sol–gel-derived coatings. In this article, thick (~15 μm) silicon-oxo-dominated nanocomposite coatings with high transparency were fabricated by incorporating 3-methacryloxypropyltrimethoxysilane (MPS)-modified silica alcosol into a moisture-curable polysiloxane oligomer and curing with the aid of 3-aminopropyltriehtoxysilane (APS). Effects of MPS-to-SiO2 molar ratio, SiO2 nanoparticle content, APS dosage, and curing process on the mechanical properties were thoroughly investigated using a pencil hardness tester, a flexibility tester, and a nanoindentation tester. The best properties were achieved by a coating with an MPS-to-SiO2 molar ratio of 0.1:1, a silica nanoparticle content of 10 wt%, and an APS dosage of 30 wt%. This coating demonstrated enhanced hardness (pencil hardness = 7H and microhardness = 626 MPa) and toughness (excellent flexibility of 5 mm in the mandrel bend test). Additional curing via aza-Michael addition between amino groups from APS and C=C groups from the polysiloxane oligomer can be accomplished at elevated temperatures. This enables further mechanical enhancement, namely hardness (9H and 1087 MPa), with adequate flexibility (10 mm). Such properties are superior to those reported for other sol–gel-derived silicon-oxo coatings produced at low drying temperatures. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of polysiloxane oligomer - Preparation of MPS-functionalized colloidal silica - Fabrication of silicon-oxo-dominated coatings - Characterization - RESULTS AND DISCUSSION : Preparation of silicon-oxo-dominated nanocomposites coatings - The macro-mechanical properties of the silicon-oxo coatings - Micromechanical properties of silicon-oxo coatings - Effect of the curing process on mechanical properties DOI : 10.1007/s11998-015-9676-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9676-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24411 [article]

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Evaluation of the corrosion protection of defective polyaniline/epoxy coating by localized electrochemical impedance spectroscopy / Yingjun Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 4 (07/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 4 (07/2015) . - p. 777-785 Titre : Evaluation of the corrosion protection of defective polyaniline/epoxy coating by localized electrochemical impedance spectroscopy Type de document : texte imprimé Auteurs : Yingjun Zhang, Auteur ; Yawei Shao, Auteur ; Guozhe Meng, Auteur ; Tao Zhang, Auteur ; Fuhui Wang, Auteur Année de publication : 2015 Article en page(s) : p. 777-785 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Epoxydes Magnésium -- Alliages Polyaniline Revêtements protecteurs Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : Defective epoxy varnish and hydrofluoric acid-doped polyaniline/epoxy (PANI-HF/EP) coatings were coated on the surface of an AZ91D magnesium alloy. The corrosion protection of the defective coatings was evaluated in 0.05 M NaCl by localized electrochemical impedance spectroscopy. Then, the surface of AZ91D magnesium alloy beneath the coating was analyzed by scanning electron microscopy and energy dispersive X-ray spectroscopy. The results indicated that the defective epoxy varnish coating could not protect the magnesium alloy because it only served as an electrolyte barrier. By contrast, the PANI-HF/EP coating served not only as an electrolyte barrier, but also facilitated the formation of a protective layer by redox processes. Therefore, the defective PANI-HF/EP coating could protect magnesium alloy from corrosion. Note de contenu : - EXPERIMENTAL : Materials and sample preparation - Local electrochemical impedance measurements - SEM and EDS - RESULTS : LEIS measurements - Surface morphology analysis - Surface component analysis - DISCUSSION : Corrosion protection of the defective epoxy varnish coating - Corrosion protection of the defective PANI-HF/EP coating DOI : 10.1007/s11998-015-9679-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9679-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24412 [article]

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Experiment and model validation of water concentration jump of a composite coating on 2024 Al alloy / X. Yuan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 4 (07/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 4 (07/2015) . - p. 787-791 Titre : Experiment and model validation of water concentration jump of a composite coating on 2024 Al alloy Type de document : texte imprimé Auteurs : X. Yuan, Auteur ; Z. F. Yue, Auteur ; X. Chen, Auteur ; S. F. Wen, Auteur ; L. Li, Auteur ; T. Feng, Auteur Année de publication : 2015 Article en page(s) : p. 787-791 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion Copolymère silicone époxy Couches minces Revêtements protecteurs Silanes Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : Water diffusion in a composite coating on 2024 Al alloy was experimentally studied using electrochemical impedance spectroscopy (EIS). The composite coating contained an inner silane film and an outer silicone-epoxy layer. The measured value of water diffusion coefficient of the composite coating by the EIS method was compared to the value predicted using a mathematical model. The results indicated the non-continuity of water concentration at the interface of silane film and silicone-epoxy layer. Considering water concentration jump on the silane film/silicone-epoxy boundary, the diffusion coefficient of the composite coating obtained by validation model was similar to that obtained from the experimental method. Note de contenu : - EXPERIMENT DETAILS : Sample preparation - EIS measurements and data analysis - RESULTS AND DISCUSSION : Water diffusion behavior in the composite coating on Al alloy - The validation model of the water concentration jump in the composite coating DOI : 10.1007/s11998-015-9666-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9666-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24413 [article]

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Encapsulation of volatile compounds in silk microparticles / Roberto Elia in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 4 (07/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 4 (07/2015) . - p. 793-799 Titre : Encapsulation of volatile compounds in silk microparticles Type de document : texte imprimé Auteurs : Roberto Elia, Auteur ; Jin Guo, Auteur ; Stephanie Budijono, Auteur ; Valery Normand, Auteur ; Daniel Benczédi, Auteur ; Fiorenzo Omenetto, Auteur ; David L. Kaplan, Auteur Année de publication : 2015 Article en page(s) : p. 793-799 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alcool polyvinylique Diffusion (physique) Emulsions Encapsulation Parfums Particules (matières) Polyéthylène glycol Protéines Revêtements Soie et constituants Index. décimale : 667.9 Revêtements et enduits Résumé : Various techniques have been employed to entrap fragrant oils within microcapsules or microparticles in the food, pharmaceutical, and chemical industries for improved stability and delivery. In the present work, we describe the use of silk protein microparticles for encapsulating fragrant oils using ambient processing conditions to form an all-natural biocompatible matrix. These microparticles are stabilized via physical crosslinking, requiring no chemical agents, and are prepared with aqueous and ambient processing conditions using polyvinyl alcohol–silk emulsions. The particles were loaded with fragrant oils via direct immersion of the silk particles within an oil bath. The oil-containing microparticles were coated using alternating silk and polyethylene oxide layers to control the release of the oil from the microspheres. Particle morphology and size, oil loading capacity, release rates as well as silk–oil interactions and coating treatments were characterized. Thermal analysis demonstrated that the silk coatings can be tuned to alter both retention and release profiles of the encapsulated fragrance. These oil-containing particles demonstrate the ability to adsorb and controllably release oils, suggesting a range of potential applications including cosmetic and fragrance utility. Note de contenu : - MATERIALS AND METHODS : Materials - Solution - Silk microsphere formation - Fragrance incorporation - Scanning electron microscopy - Thermogravimetric analysis - Fourier Transform Infrared Spectroscopy - RESULTS AND DISCUSSION : Incorporation of fragrances in preformed silk microparticles - Fragrance retention in silk microparticles using silk coatings - Tuning silk coatings for altered release DOI : 10.1007/s11998-015-9668-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9668-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24414 [article]

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Sodium silicate-assisted emulsification of methyltrimethoxysilane and formation of superhydrophobic coating thereof / Ying Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 4 (07/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 4 (07/2015) . - p. 801-805 Titre : Sodium silicate-assisted emulsification of methyltrimethoxysilane and formation of superhydrophobic coating thereof Type de document : texte imprimé Auteurs : Ying Wang, Auteur ; Sheng Yang, Auteur ; Jin Fang, Auteur ; Baiyu Li, Auteur Année de publication : 2015 Article en page(s) : p. 801-805 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Emulsions Hydrophobie Méthyltriméthoxysilane Polyméthylsilsesquioxane Revêtements Silicate de sodium Index. décimale : 667.9 Revêtements et enduits Résumé : Polymethylsilsesquioxane (PMSQ) is highly heat and weather resistant and is excellent as a coating material. In the present work, the precursor for PMSQ, methyltrimethoxysilane (MTMS), was emulsified in aqueous medium with the aid of sodium silicate. It was found that at a proper concentration and ratio of MTMS to sodium silicate, the precursor MTMS could be emulsified to form an emulsion. After drying the coated emulsion on a substrate in air at room temperature, a superhydrophobic coating with water contact angle of 153° was obtained. Scanning electronic microscopy characterization indicates that the coating consists mainly of interconnected sub-100 nm particles from emulsion droplets. During drying, PMSQ formed in the emulsion droplet penetrated the outer surface of the emulsified particle, imparting hydrophobicity and nanoscale roughness to the surface. These roughness and hydrophobic properties resulted in superhydrophobicity of the coating. The process is simple and has potential for large area fabrication of superhydrophobic surfaces. DOI : 10.1007/s11998-015-9671-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9671-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24415 [article]

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