Bond strength of hybrid sol-gel coatings with different additives / Mousa May in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 3 (05/2013)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 3 (05/2013) . - p. 407-413 Titre : Bond strength of hybrid sol-gel coatings with different additives Type de document : texte imprimé Auteurs : Mousa May, Auteur ; Heming Wang, Auteur ; Robert Akid, Auteur Année de publication : 2013 Article en page(s) : p. 407-413 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Alumine Dioxyde de titane Microscopie Microscopie électronique à balayage Nanoparticules Polyaniline Revêtements Sol-gel, Procédé Index. décimale : 667.9 Revêtements et enduits Résumé : The hybrid sol–gel coating on Al 2024-T3 was modified by adding polyaniline, TiO2, or γ-Al2O3 nanoparticles in the formulation separately. The coating was then used as an adhesive to bond Al 2024-T3 alloys, forming a single lap joint. The bond strength of the sol–gel coating was investigated using a universal tensile test machine. The lap shear strength of the original sol–gel coating was about 1.38 MPa and it was increased up to 2.26 MPa after the modification by adding 0.05 wt% PANI microparticles in the sol–gel coating. The small increase in strength was attributed to an improvement in its adhesive flexibility because of incorporation of the long-chain organic polymer in its structure. Furthermore, the addition of different amounts of TiO2 nanoparticles in the unmodified sol–gel coating also led to an increase in shear strength compared to the undoped sol–gel coating. Typically, a sol–gel coating containing 2.0 wt% of TiO2 recorded the highest adhesive strength of about 4.0 MPa. A similar increase in strength was observed when doping γ-Al2O3 nanoparticles into the original hybrid sol–gel coating. Adding 0.5 wt% of γ-Al2O3 in the sol–gel coating increased the adhesive bonding strength up to 4.48 MPa. The fracture surface of the specimen was separately observed by SEM and Optical Microscopy in order to examine potential evidences of mechanism and nature of failure. The reason why the adhesive strength increased after the modification of the sol–gel coating is discussed in this article. Note de contenu : - EXPERIMENTAL WORK : Materials - Preparation of adhesion samples - Adhesion strength measurements - RESULTS AND DISCUSSION : Bond strength of hybrid sol-gel coatings - EFFECTS OF DIFFERENT ADDITIVES ON THE SOL-GEL ADHESIVE STRENGTH : Doping 0.05% PANI - Effects of the addition of TiO2 nanoparticules - Effects of the addition of γ-Al2O3 nanoparticles - FTIR characterization of the fracture surface DOI : 10.1007/s11998-012-9450-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9450-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18739 [article]

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Influence of adding multiwalled carbon nanotubes on the adhesive strength of composite epoxy/sol-gel materials / Heming Wang ; Robert Akid in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 2 (03/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 2 (03/2016) . - p. 325-332 Titre : Influence of adding multiwalled carbon nanotubes on the adhesive strength of composite epoxy/sol-gel materials Type de document : texte imprimé Auteurs : Heming Wang, Auteur ; Robert Akid, Auteur Année de publication : 2016 Article en page(s) : p. 325-332 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Epoxydes Essais dynamiques Nanotubes de carbone à parois multiples Un nanotube de carbone multifeuillet est constitué de plusieurs feuillets de graphènes enroulés les uns autour des autres. Il existe deux modèles pour décrire la structure des nanotubes multifeuillets : - le modèle poupée russe: les plans de graphène sont arrangés en cylindres concentriques ; - le modèle parchemin: un seul feuillet de graphène est enroulé sur lui-même, comme une feuille de papier. Résistance au cisaillement Revêtements -- Propriétés mécaniques Sol-gel, Procédé Index. décimale : 667.9 Revêtements et enduits Résumé : The tensile shear strength of a composite epoxy/sol–gel system modified with different ratios of multiwall carbon nanotubes (MWCNTs) was evaluated using a mechanical testing machine. The experimental results showed that the shear strength increased when lower than ~0.07 wt% of MWCNTs were added in the composite solution. The increase of the shear strength was attributed to both the mechanical load transfer from the matrix to the MWCNTs and the high specific surface area of this material that increased the degree of crosslinking with other inorganic fillers in the formulation. However, a decrease in the adhesive shear strength was observed after more than ~0.07 wt% MWCNTs were added to the composite. The reason for this may be related to the high concentration of MWCNTs within the matrix leading to excessively high viscosity, dewetting of the substrate surfaces, and reduced bonding of MWCNTs with the matrix, thereby limiting the strength. SEM observation of the fracture surfaces for composite epoxy/sol–gel adhesive materials with 0.01 wt% MWCNTs showed a mixed interfacial/cohesive fracture mode. This fracture mode indicated strong links at the adhesive/substrate interface, and interaction between CNTs and the matrix was achieved; therefore, adhesion performance of the composite epoxy/sol–gel material to the substrate was improved. An increase of a strong peak related to the C–O bond at ~1733 cm−1 in the FTIR spectra was observed. This peak represented crosslinking between the CNT surface and the organosilica nanoparticles in the MWCNTs-doped composite adhesive. Raman spectroscopy was also used to identify MWCNTs within the adhesive material. The Raman spectra exhibit peaks at ~1275 cm−1 and in the range of ~1549–1590 cm−1. The former is the graphite G-band, while the latter is the diamond D-band. The D-band and G-band represent the C–C single bond and C=C double bond in carbon nanotubes, respectively. Note de contenu : - EXPERIMENTAL WORK : Materials - Composite epoxy/sol-gel solution preparation - Dispersion of MWCNTsinto the epoxy/sol-gel material - Mechanical and surface characterization - RESULTS AND DISCUSSION : Adhesive shear strength - SEM observation - FTIR spectra of the composite/epoxy sol-gel adhesive - Raman spectra analysis DOI : 10.1007/s11998-015-9761-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9761-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26117 [article]

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Protective developments / Robert Akid in EUROPEAN COATINGS JOURNAL (ECJ), N° 05/2008 (05/2008)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 05/2008 (05/2008) . - p. 24-28 Titre : Protective developments : Sol-gel systems show promise in antifouling and corrosive systems Type de document : texte imprimé Auteurs : Robert Akid, Auteur ; Heming Wang, Auteur Année de publication : 2008 Article en page(s) : p. 24-28 Note générale : Notes bibliogr. Langues : Anglais (eng) Catégories : Anticorrosion Conducteurs organiques Matériaux hybrides Revêtements antisalissures:Peinture antisalissures Sol-gel, Procédé Index. décimale : 667.9 Revêtements et enduits Résumé : Three current projects involving hybrid organic-inorganic sol-gel coatings are described. Anticorrosive coatings have been developed as replacements for chromium pretreatment. Bio-active coatings limit the growth of fouling and corrosion-promoting micro-organisms. Conductive polymers have been incorporated in sol-gel systems to create anticorrosive coatings. En ligne : https://drive.google.com/file/d/1YTJAR-gXVlnMMR2HWrBEdOwO2kZ0epLu/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2392 [article]

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