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Effect of heterogeneity on hydro/ice-phobic properties of alkylsilane/fluoro-alkylsilane-based coatings on Al substrates / Faranak Arianpour in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 1 (01/2017)
[article]
Titre : Effect of heterogeneity on hydro/ice-phobic properties of alkylsilane/fluoro-alkylsilane-based coatings on Al substrates Type de document : texte imprimé Auteurs : Faranak Arianpour, Auteur ; Shahram Farhadi, Auteur ; Masoud Farzaneh, Auteur ; Reza Jafari, Auteur Année de publication : 2017 Article en page(s) : p. 267–275 Note générale : Erratum p. 277 - Bibliogr. Langues : Américain (ame) Catégories : Adhésion
AluminiumL'aluminium est un élément chimique, de symbole Al et de numéro atomique 13. C’est un métal pauvre, malléable, de couleur argent, qui est remarquable pour sa résistance à l’oxydation13 et sa faible densité. C'est le métal le plus abondant de l'écorce terrestre et le troisième élément le plus abondant après l'oxygène et le silicium ; il représente en moyenne 8 % de la masse des matériaux de la surface solide de notre planète. L'aluminium est trop réactif pour exister à l'état natif dans le milieu naturel : on le trouve au contraire sous forme combinée dans plus de 270 minéraux différents, son minerai principal étant la bauxite, où il est présent sous forme d’oxyde hydraté dont on extrait l’alumine. Il peut aussi être extrait de la néphéline, de la leucite, de la sillimanite, de l'andalousite et de la muscovite.
L'aluminium métallique est très oxydable, mais est immédiatement passivé par une fine couche d'alumine Al2O3 imperméable de quelques micromètres d'épaisseur qui protège la masse métallique de la corrosion. On parle de protection cinétique, par opposition à une protection thermodynamique, car l’aluminium reste en tout état de cause très sensible à l'oxydation. Cette résistance à la corrosion et sa remarquable légèreté en ont fait un matériau très utilisé industriellement.
L'aluminium est un produit industriel important, sous forme pure ou alliée, notamment dans l'aéronautique, les transports et la construction. Sa nature réactive en fait également un catalyseur et un additif dans l'industrie chimique ; il est ainsi utilisé pour accroître la puissance explosive du nitrate d'ammonium.
Angle de contact
Couches minces multicouches
Fluoroalkylsilane
Hydrophobie
HystérésisL'hystérésis (ou hystérèse) et signifiant "après" ou "plus tard", est la propriété d'un système qui tend à demeurer dans un certain état quand la cause extérieure qui a produit le changement d'état a cessé.
Métaux -- Revêtements protecteurs
Revêtements antigel
Revêtements multicouchesIndex. décimale : 667.9 Revêtements et enduits Résumé : In this work, hydrophobic and anti-ice performances of heterogeneous coatings (HCs) were studied. Multilayer thin films of homogeneous and heterogeneous chemically different alkylsilane compounds, i.e., octadecyltrichlorosilane (OD) and 1H,1H,2H,2H-perfluorooctyltrichlorosilane (PF) were fabricated by alkylsilane/fluoro-alkylsilane deposition on a flat aluminum alloy (AA6061) substrate. The contact angle (CA) values for the homogeneous coatings of OD–OD and PF–PF after a 12-h immersion time (IT) were ~140° and ~120°, respectively. However, significant improvements in CA values were observed for the HCs, PF–OD and OD–PF, with CA values of ~154° and ~160°, respectively, for a 12-h IT. Moreover, very small contact angle hysteresis (CAH) values of ~6°–7° were obtained for PF–OD and OD–PF, whereas large CAH values of ~40°–65° were obtained for the homogeneous coatings. Scanning electron microscopy of the coated surfaces showed a rough structure at the micro-/nano-meter scale and X-ray photoelectron spectroscopy analysis indicated the presence of alkylsilane and/or fluoro-alkylsilane molecules on polished aluminum surfaces. The ice adhesion reduction factor (ARF) of OD–OD and PF–PF homogeneous coatings shows that ice adhesion strength is about 1.5 and 1.7 times lower, respectively, than that obtained on a polished bare Al sample. However, the ARF of PF–OD and OD–PF HCs shows that ice adhesion strength is about 2.7 and 3.5 times, respectively, lower than that obtained on a polished bare Al sample. DOI : 10.1007/s11998-016-9819-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9819-z.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27808
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Code-barres Cote Support Localisation Section Disponibilité 18674 - Périodique Bibliothèque principale Documentaires Disponible Electrophoretically deposited graphene oxide–polymer bilayer coating on Cu-Ni alloy with enhanced corrosion resistance in simulated chloride environment / Geetisubhra Jena in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)
[article]
Titre : Electrophoretically deposited graphene oxide–polymer bilayer coating on Cu-Ni alloy with enhanced corrosion resistance in simulated chloride environment Type de document : texte imprimé Auteurs : Geetisubhra Jena, Auteur ; S. C. Vanithakumari, Auteur ; S. R. Polaki, Auteur ; R. P. George, Auteur ; John Philip, Auteur ; G. Amarendra, Auteur Année de publication : 2019 Article en page(s) : p. 1317-1335 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse électrochimique
Anticorrosifs
Anticorrosion
GraphèneLe graphène est un cristal bidimensionnel (monoplan) de carbone dont l'empilement constitue le graphite. Il a été isolé en 2004 par Andre Geim, du département de physique de l'université de Manchester, qui a reçu pour cette découverte le prix Nobel de physique en 2010 avec Konstantin Novoselov. Il peut être produit de deux manières : par extraction mécanique du graphite (graphène exfolié) dont la technique a été mise au point en 2004, ou par chauffage d'un cristal de carbure de silicium, qui permet la libération des atomes de silicium (graphène epitaxié). Record en conduction thermique jusqu'à 5300 W.m-1.K-1. C'est aussi un matériaux conducteur.
Métaux -- Revêtements protecteurs
Oxyde de graphène
Polarisation (électricité)
Polyacryliques
Revêtements multicouches
Spectroscopie d'impédance électrochimiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : An environmentally benign and facile bilayer coating comprised of graphene oxide (GO) and acrylic polymer is fabricated over cupronickel sample using electrophoretic deposition followed by dip coating. The infrared, Raman, and field emission scanning electron microscopy (FESEM) studies of the bilayer coating confirm the noncovalent functionalization of GO through H-bonding with acrylic polymer, reduction in local defects in GO structure, and distorted spherical void peripheries of polymer coating, respectively. The FESEM cross-sectional analysis showed that the coating thickness is 5–6 µm. The bilayer-coated sample showed a three- to fourfold increase in the corrosion resistance, as compared to GO-alone-coated sample in 3.5% (w/v) NaCl electrolyte, which is attributed to the reduction in the local defects in GO coating and the galvanic coupling between the GO and sample surface. The GO sheets make the diffusion pathway of corrosive media more tortuous for corrosive ions to reach the metal surface. The lower anodic current density observed with the new bilayer coating after 30 days of exposure confirms the active corrosion protection. The coating was intact and stable after 30 days of exposure in chloride medium with a water uptake of about 32.7%. Note de contenu : - EXPERIMENTAL METHODS : Materials - GO coating on Cu-Ni alloy by electrophoretic deposition (EPD) - Post-treatment of GO-coated Cu-Ni with acrylic-based polymer - Characterization of coatings before exposure - Electrochemical studies - Long-term exposure studies
- RESULTS AND DISCUSSION : Characterization of coatings before exposure - Electrochemical characterization - Elucidating the mechanism of corrosion protection performance - Long-term exposure studies - Electrochemical characterization under long-term exposure - Characterization of uncoated and Go-polymer bilayer-coated Cu-Ni samples after long-term exposureDOI : 10.1007/s11998-019-00213-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00213-6.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33014
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Code-barres Cote Support Localisation Section Disponibilité 21154 - Périodique Bibliothèque principale Documentaires Disponible Epoxy-based multilayered coating containing carbon nanotube (CNT), silicon carbide (SiC), and carbonyl iron (CI) particles: as efficient microwave absorbing materials / Firouz Ghanbari in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 3 (05-06/2020)
[article]
Titre : Epoxy-based multilayered coating containing carbon nanotube (CNT), silicon carbide (SiC), and carbonyl iron (CI) particles: as efficient microwave absorbing materials Type de document : texte imprimé Auteurs : Firouz Ghanbari, Auteur ; Shahram Moradi Dehaghi, Auteur ; Hossein Mahdavi, Auteur Année de publication : 2020 Article en page(s) : p. 815–826 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Carbure de silicium
Epoxydes
Essais (technologie)
Fer carbonylé
Micro-ondes
Morphologie (matériaux)
Nanotubes
Ondes électromagnétiques -- Absorption
Revêtements multicouches
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : In this work, an epoxy-based microwave absorbing coating (MAC) containing carbon nanotube (CNT), silicon carbide (SiC), and carbonyl iron (CI) particles was prepared. In order to achieve some optimum key properties such as high and broadband microwave absorbing properties, low density, and relatively low cost, a gradient structure and alternating multilayer structure are used simultaneously. The effect of a single layer containing one type of filler, single layer containing several types of fillers, and multilayer structures on mentioned key parameters are investigated. The electromagnetic parameters and the reflection loss (RL) versus frequency of samples were tested by network analyzer in the range of 2–18 GHz using the transmission/reflection method. As a final result, the multilayer MACs included nine layers in which each of the layers contained one type of the fillers (CNT, CI, and SiC) and three neat resin interlayers 2 mm in total thickness compared to other samples and provided a maximum return loss value of 17.6 dB at 08.50 GHz and an absorption bandwidth (RL < − 5 dB) of 16 GHz (2–18 GHz) with a density of 1.61 g/cm3. So, it is simply possible to obtain an efficient MAC due to suitable microwave absorbing filler distribution in multilayer coatings for any respective application. Note de contenu : - EXPERIMENTAL : Materials - Specimen preparation - Characterization and testing
- RESULTS AND DISCUSSION : Morphological study - Electromagnetic characteristics - Microwave absorption propertiesDOI : https://doi.org/10.1007/s11998-020-00309-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00309-z.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34110
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Code-barres Cote Support Localisation Section Disponibilité 21734 - Périodique Bibliothèque principale Documentaires Disponible A facile process for fabrication of environmentally safe superhydrophobic surfaces / Tanu Mittal in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)
[article]
Titre : A facile process for fabrication of environmentally safe superhydrophobic surfaces Type de document : texte imprimé Auteurs : Tanu Mittal, Auteur ; Sangeeta Tiwari, Auteur ; S. K. Tiwari, Auteur Année de publication : 2017 Article en page(s) : p. 1289-1295 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dioxyde de silicium
Dip-coating
Fluoropolymères
Hydrophobie
Revêtement auto-nettoyant
Revêtements multicouches
Sol-gel, Procédé
Verre -- RevêtementsIndex. décimale : 667.9 Revêtements et enduits Résumé : Superhydrophobic coatings have opened new vistas in the field of self-cleaning surfaces by having improved performance, robustness and preservation of cleaning agents including water. Presently, fluoropolymers are extensively explored and used for this purpose. However, the major drawback accompanying fluoropolymers is formation of environmentally persistent and toxic compounds, viz. PFOA (perfluorooctanoic acid) and PFOS (perfluorooctanesulfonic acid) on their degradation raising concern on their use. In the present study, an effort has been made to develop a facile process by using an environmentally safe material. A simple dip coating technique is reported to fabricate superhydrophobic surface. SiO2 nanoparticles of size 25–30 nm, prepared by sol–gel route, were dip-coated on glass substrate in multilayers followed by coating of a surfactant to achieve homogeneity of SiO2 layers and enhanced binding with subsequent layer of NUVA-2114 [a commercially used fluorotelomer with chemical composition C2F6(CF2CF2)nX]. It was observed that SiO2 nanoparticles and sodium dodecyl sulfate (SDS) surfactant exhibit a synergistic effect on interface stability at optimized SDS concentration. A water contact angle of 152° is achieved. The established method is simple, scalable, environmentally safe and cost-effective. Note de contenu : - EXPERIMENTAL : Materials - Preparation of SiO2 NPs by sol–gel route - Deposition of SiO2 NPs on glass substrate - Deposition of SDS and NUVA 2114 layers over SiO2 NPs - Characterization
- RESULTS AND DISCUSSION : Particle size and morphology of SiO2 NPs - SiO2 NPs deposition on glass substrate - Role of SDS in stabilization of interfaces between various layers
- CONTACT ANGLE AND AFM ANALYSIS
- OPTICAL CHARACTERIZATION
DOI : 10.1007/s11998-017-9927-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9927-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29629
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Code-barres Cote Support Localisation Section Disponibilité 19441 - Périodique Bibliothèque principale Documentaires Disponible Flow and heat transfer of two immiscible fluids in double-layer optical fiber coating / Zeeshan Khan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 6 (11/2016)
[article]
Titre : Flow and heat transfer of two immiscible fluids in double-layer optical fiber coating Type de document : texte imprimé Auteurs : Zeeshan Khan, Auteur ; Saeed Islam, Auteur ; Rehan Ali Shah, Auteur ; Ilyas Khan, Auteur Année de publication : 2016 Article en page(s) : p. 1055-1063 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Fibres optiques
Modèles mathématiques
Revêtements multicouches
ThermocinétiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : The coatings of optical fibers are generally characterized by a multi-layer coating structure. In this work, the mathematical modeling of two immiscible non-Newtonian fluids for optical fiber coating inside a straight annular die is developed in the form of a nonlinear differential equation with nonhomogeneous boundary conditions. Two non-Newtonian fluids, namely power law and Phan-Thien–Tanner fluids, are used in the primary and secondary coating dies, respectively. An exact solution is obtained for velocity fields and temperature distributions for the primary and secondary coating resins. The thickness of coated fiber optics is also calculated for both layers. The effect of different emerging parameters on the solution is discussed and sketched. DOI : 10.1007/s11998-016-9817-1 En ligne : http://link.springer.com/content/pdf/10.1007%2Fs11998-016-9817-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27261
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