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Improving surface properties by laser-based drying, gelation, and densification of printed sol–gel coatings / Dominik Hawelka in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 1 (01/2014)
[article]
Titre : Improving surface properties by laser-based drying, gelation, and densification of printed sol–gel coatings Type de document : texte imprimé Auteurs : Dominik Hawelka, Auteur ; Jochen Stollenwerk, Auteur ; Norbert Pirch, Auteur ; Konrad Wissenbach, Auteur ; Peter Loosen, Auteur Année de publication : 2014 Article en page(s) : p. 3-10 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couches minces
Lasers -- Applications industrielles
Réticulation (polymérisation)
Revêtements:Peinture
Sol-gel, Procédé
ZirconeLe dioxyde de zirconium ou oxyde de zirconium(IV) couramment appelée zircone est un composé inorganique du zirconium de formule ZrO2. Ce matériau est une céramique technique d'aspect opaque. Appelé CZ (Cubic Zirconia) lorsque transparent, il est utilisé pour imiter le diamant. Il ne faut pas le confondre avec le zircon (ZrSiO4). Sous sa forme tétragonale, l'oxyde de zirconium est un matériau a vocation mécanique, cette évolution cristallographique lui confère une dureté très élevée (1200Hv) ainsi qu'une bonne résistance aux sollicitations mécaniques (700Mpa en traction et 2000Mpa en compression). Une fois polie, la zircone tétragonale peut atteindre un Ra de 0,02, ce qui permet de l'utiliser pour des pièces de frottement.Index. décimale : 667.9 Revêtements et enduits Résumé : In this article, an innovative laser-based inline-capable coating process for the production of highly wear resistant coatings is presented. A zirconia-based sol–gel material is applied onto hardened and tempered steel substrates by a PipeJet-based printing process and spin-coating. Green films with a thickness of 100–200 nm are produced. Drying, gelation, and transformation of the green films into mechanically resistant wear protection coatings is done by laser treatments. Due to the precise temporal and spatial controllability of the diode laser radiation it is possible to generate temperatures >1000°C, required for the crystallization of the films, as well as to minimize the thermal load of the substrate. The formation of a tetragonal ZrO2 phase within the films is achieved by the laser treatment. According to finite-element calculations the temperature penetration depth of temperatures >150°C (thermal stability of the substrate around 180°C) is reduced to 20–100 μm by using pulsed diode laser radiation. The evolution of the layer thickness as well as chemical and morphological coating properties is investigated by white light interferometry, Fourier transform infrared spectroscopy, and grazing-incidence XRD measurements. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Application of the coating material - Laser treatment
- MODELINGDOI : 10.1007/s11998-013-9516-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9516-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20610
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Code-barres Cote Support Localisation Section Disponibilité 16023 - Périodique Bibliothèque principale Documentaires Disponible In vitro bactericidal effect of ultrasonically sol–gel-coated novel CuO/TiO2/PEG/cotton nanocomposite for wound care / Arman Khani in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 3 (05/2017)
[article]
Titre : In vitro bactericidal effect of ultrasonically sol–gel-coated novel CuO/TiO2/PEG/cotton nanocomposite for wound care Type de document : texte imprimé Auteurs : Arman Khani, Auteur ; Nasrin Talebian, Auteur Année de publication : 2017 Article en page(s) : p. 651-663 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens
Citrique, AcideL'acide citrique est un acide alpha hydroxylé de formule C6H8O7.
Il joue un rôle central dans le métabolisme de tous les organismes vivants et tient son nom de son origine; le citron.
L'acide citrique est biodégradable et n'est pas toxique pour l'homme ni pour l'environnement. Cependant, comme tout acide, il est irritant et peut provoquer des brûlures s'il entre en contact prolongé avec des muqueuses.
À pH physiologique, il est présent sous forme de sa base conjuguée, le citrate, qui est un chélateur de l'ion calcium dans le sang.
CotonLe 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).
Dioxyde de titane
Matériaux hybrides
Nanoparticules
Oxydes de cuivre
Polyéthylène glycol
Sol-gel, Procédé
Sonochimie
Surfaces fonctionnelles
Textiles et tissus à usages médicaux
Textiles et tissus à usages techniques
Traîtements de surface
UltrasonsIndex. décimale : 667.9 Revêtements et enduits Résumé : Protection against bacterial contamination remains a demand for healthcare textiles such as wound dressings to reduce or eliminate hospital-acquired infections related to antibiotic-resistant bacteria. We report herein a simple and straightforward in situ approach to deposit copper oxide and titanium oxide nanoparticles onto cotton fabric using a sonochemical-mediated sol–gel method. Modification of the cotton surface was achieved by incorporation of citric acid (CA) and polyethylene glycol (PEG) to improve the attachment of the nanoparticles and reduce the attachment of bacteria to the cotton surface, respectively. The resultant cotton fabric was used against Escherichia coli as a Gram-negative bacterium and Staphylococcus aureus as a Gram-positive bacterium in dark condition as an in vitro model for treatment of bacterial wound infection. The effects of different treatment parameters including duration and frequency of ultrasonic irradiation, surface modification with PEG and/or CA, and cotton chemical composition with different metal oxide molar ratios on the antibacterial activity of the treated cotton fabric were studied. All treated cotton fabrics showed antibacterial activity, with higher efficiency for those coated with CuO or CuO/TiO2 (1:1 molar ratio) among the single metal oxide and composite-modified cotton fibers, respectively. Our results show that such functionalized cotton fibers could actively fight the spread of bacterial infections by preventing bacterial adhesion, enabling more efficient bonding, and ultrasonically promoting generation of nanoparticles and their strong adhesion to the fabric surface. Note de contenu : - EXPERIMENTAL : Materials - Sol preparation and application onto cotton fabric - Characterization - Microbiological tests - Agar diffusion test - Dynamic shake tests - Washing durability test
- RESULTS AND DISCUSSION : Structural and morphological characterization - Antibacterial activityDOI : 10.1007/s11998-016-9870-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9870-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28573
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Code-barres Cote Support Localisation Section Disponibilité 18899 - Périodique Bibliothèque principale Documentaires Disponible 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]
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 multiplesUn 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, ProcédéIndex. 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 analysisDOI : 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 : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26117
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Code-barres Cote Support Localisation Section Disponibilité 17962 - Périodique Bibliothèque principale Documentaires Disponible Influence of radical photoinitiator content on UV curing process and UV-cured hybrid sol–gel films / Anaïs Even in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 2 (03/2020)
[article]
Titre : Influence of radical photoinitiator content on UV curing process and UV-cured hybrid sol–gel films Type de document : texte imprimé Auteurs : Anaïs Even, Auteur ; Guillaume Vignaud, Auteur ; Nadia Guitter, Auteur ; Nathalie Le Bozec, Auteur ; Philippe Tingaut, Auteur ; Yves Grohens, Auteur Année de publication : 2020 Article en page(s) : p. 333-343 Note générale : Bibliogr. Langues : Américain (ame) Catégories : AlkylTriméthoxysilane
Matériaux -- Propriétés barrières
Matériaux hybrides
Méthacrylates
Nanostructures
Photoamorceurs (chimie)
Photoréticulation
Polyaddition
Revêtements -- Propriétés thermomécaniques
Revêtements -- Séchage sous rayonnement ultraviolet
Revêtements organiques
Sol-gel, ProcédéIndex. décimale : 667.9 Revêtements et enduits Résumé : Hybrid sol–gel coatings are widely used as protective layers for aluminum alloys because of their barrier abilities. This study aims at explaining the barrier properties of a sol–gel coating based on alkyltrimethoxysilane and methacrylate resin by its film structure. This approach was examined by modifying one photopolymerization parameter, e.g., by varying the content of radical photoinitiator. By neutral salt spray test and electrochemical impedance spectroscopy, the barrier properties are highlighted. The film structure is related to thermomechanical properties of films whose glass transition temperature and elastic modulus are measured by dynamic mechanical analysis and nanoindentation, respectively. On a finer scale, conversion of methacrylate functions calculated from Fourier transform infrared spectroscopy has given information on the chemical structure of films. The morphology of these coatings is studied by scanning electron microscopy, transmission electron microscopy, atomic force microscopy operating in tapping mode, and X-ray diffraction. Results revealed that formulations containing between 3 and 9 wt% of radical photoinitiator exhibit the maximal conversion of methacrylate functions and, at a microscopic scale, a homogeneous coating where the two organic and inorganic networks are well interpenetrated. This hybrid sol–gel microstructure corresponds to the highest glass transition temperature and the highest mechanical characteristics (elastic modulus, E and hardness, H) and the highest protection performance. This results in the best barrier properties, and thus the highest corrosion resistance. Note de contenu : - EXPERIMENTAL : Materials - Film preparation - Methods
- RESULTS AND DISCUSSION : Aspect - Barrier properties - Thermomechanical properties - Hybrid micro and nanostructure of UV-cured filmsDOI : https://doi.org/10.1007/s11998-019-00276-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00276-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33985
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Code-barres Cote Support Localisation Section Disponibilité 21658 - Périodique Bibliothèque principale Documentaires Disponible Inorganic-organic hybrid sol-gel coatings / Brijesh Mishra in PAINTINDIA, Vol. LXIV, N° 10 (10/2014)
[article]
Titre : Inorganic-organic hybrid sol-gel coatings Type de document : texte imprimé Auteurs : Brijesh Mishra, Auteur Année de publication : 2014 Article en page(s) : p. 53-59 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosifs
Anticorrosion
Matériaux hybrides
Métaux -- Revêtements protecteurs
Sol-gel, ProcédéIndex. décimale : 667.9 Revêtements et enduits Résumé : The development of hybrid materials has been extensively investigated in recent years. Hybrid sol-gel coating technology is one of the modern coating technologies to modify the surface property of metal without changing the metallic look of the surface.
The combination of a wide variety of compositions and production processes had permitted the use of these materials in different applications like coatings for corrosion protection of metals, antireflection coatings, etc.
Protective coatings based on sol-gel technology shows excellent chemical stability , oxidation control ans enhanced corrision resistance of metal substrate.
Nowadays, environmental legislation has pressured to prohibit the use of toxic material like chromate in pretreatment. The organic-inorganic hybrid films made by sol-gel reaction can be developed as an alternate for chromate in pretreatment. The low temperature processing conditions of the Sol-gel hybrids and their fast curing behaviour enables one to perform coil coating processes and to apply thin film on metal sheets.Note de contenu : - BRIEF HISTORY OF SOL-GEL CHEMISTRY
- PREPARATION OF SOL-GEL COATINGS: Precursor substituent effect
- MECHANISM OF SOL-GEL COATING PROCESS: Factor affecting sol-gel reaction - Methods of application of sol-gel coating - Spin coatings - Dip coatings - Spray coatings - Application of sol-gel coatings
- ADVANTAGES OF THE INORGANIC-ORGANIC HYBRID SOL-GEL COATING: Some disadvantages of the sol-gel methodEn ligne : https://drive.google.com/file/d/1cthdWFTMTgK4Ak7nyoPeGiWOsauEjP7y/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22509
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