Antibacterial and antifungal properties of clear coating film containing silver-cytokinin complex as a filler / Fumihiko Ohashi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 6 (11/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 6 (11/2020) . - p. 1619-1623 Titre : Antibacterial and antifungal properties of clear coating film containing silver-cytokinin complex as a filler Type de document : texte imprimé Auteurs : Fumihiko Ohashi, Auteur ; Atsushi Shibahara, Auteur Année de publication : 2020 Article en page(s) : p. 1619-1623 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antimicrobiens Argent Caractérisation Charges (matériaux) Cytokinine Les cytokinines sont des substances proches des bases puriques (adénines substituées). C'est une famille de phytohormones indispensables au développement de la plante tout comme l'auxine, ayant fonction d'hormones chez les végétaux. (Wikipedia) Nanoparticules Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : A silver-cytokinin complex filler was synthesized by a mild thermal process; then, the complex was mixed with an aqueous emulsion paint as an antimicrobial filler. Coating films were prepared by a typical method using 0.254 mm applicator. The results of antibacterial activity measurements indicated that the films exhibited strong activities against Escherichia coli and Staphylococcus aureus. Values of the antibacterial activity (n = 3) were 5.7 and 4.9, respectively. As for the mixture of five kinds of fungi, after cultivation (n = 5), no colony growth on the film surface was observed by microscopy. From the appearance of the film surfaces, it was revealed that the silver–cytokinin complex filler for emulsion paints possessed better paintability and transparency compared to a commercialized paint filler. Note de contenu : - Preparation of coating films - Characterization DOI : https://doi.org/10.1007/s11998-020-00399-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00399-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34965 [article]

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Characterization of synthetic aluminum silicate-coated titanium dioxide photocatalysts as a functional filler / Fumihiko Ohashi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 5 (09/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 5 (09/2023) . - p. 1789-1794 Titre : Characterization of synthetic aluminum silicate-coated titanium dioxide photocatalysts as a functional filler Type de document : texte imprimé Auteurs : Fumihiko Ohashi, Auteur Année de publication : 2023 Article en page(s) : p. 1789-1794 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Charges (matériaux) Composés inorganiques -- Synthèse Dioxyde de titane Enrobage (technologie) Matériaux -- Propriétés fonctionnelles Matériaux hybrides Photocatalyseurs Photodétérioration Silicate d'aluminium Index. décimale : 667.9 Revêtements et enduits Résumé : Synthetic amorphous aluminum silicates-coated titanium dioxides (AS–T nanocomposites) were synthesized by a hydrothermal reaction of aluminum silicate precursors with various chemical compositions and titanium dioxide suspensions. AS–T nanocomposites showed narrow particle size distributions centered between 1.0 and 2.0 μm and their specific surface areas were ranging from 138 to 209 m2/g. Water vapor adsorption isotherms revealed that AS–T nanocomposites with higher Si/Al ratios exhibited high hydrophilicity, as the maximum water adsorption rate reached almost 40 wt%. In methylene blue photocatalytic degradation tests, AS–T nanocomposites with higher Si/Al ratios showed much higher photodegradability than a commercial titanium dioxide, degrading up to 92.7% of methylene blue after 30 min of UV irradiation. A possible mechanism is that a distribution state of Si(Al)–OH and/or Si–OH–Al exposed on the aluminum silicate surface influenced the methylene blue adsorption to the surface, which significantly improved the photodegradation performance. The results of this study indicate that AS–T nanocomposites have the potential to be used as fillers in paints. Note de contenu : - EXPERIMENTAL : Preparation of nanocomposites - Characterization - RESULTS AND DISCUSSION : Microstructural characteristics of AS–Ts - Photocatalytic activity of AS–Ts - Table 1 : Characteristic data of AS–Ts and the reference DOI : https://doi.org/10.1007/s11998-023-00794-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00794-3.pdf?pdf=button Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39988 [article]

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Effect of structure-controlled aluminum silicate nanofiller on surface properties of emulsion coating films / Fumihiko Ohashi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 355–360 Titre : Effect of structure-controlled aluminum silicate nanofiller on surface properties of emulsion coating films Type de document : texte imprimé Auteurs : Fumihiko Ohashi, Auteur ; Kenji Arai, Auteur ; Atsushi Shibahara, Auteur Année de publication : 2022 Article en page(s) : p. 355–360 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Charges (matériaux) Essais accélérés (technologie) Mouillabilité Nanoparticules Revêtements antisalissures Revêtements en phase aqueuse -- Additifs Silicate d'aluminium Vernis en phase aqueuse -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : A non-crystalline aluminum silicate related to allophane (i.e., clay mineral) was synthesized by a hydrothermal reaction after which the synthetic mineral was mixed with clear or multicolored aqueous emulsion paint as a nanofiller. The nanofiller was revealed by X-ray diffraction to have an amorphous morphology, showed a narrow particle size distribution with a volume mean diameter of 1.2 µm and indicated a specific surface area of 228 m2/g. Clear films prepared with the nanofiller had significantly improved wettability compared to a blank film. The results of outdoor exposure tests exhibited that multicolored films with the nanofiller showed higher antifouling ability than films with a commercially available silica filler. A proposed antifouling mechanism is that the proportion of Si-OH and Al-OH active sites exposed on the nanofiller surface had a significant effect on the surface wettability of the films and exquisitely controlled the sliding of rain droplets. Note de contenu : - Preparation of nanofiller - Preparation of clear film - Preparation of multicolored film - Characterization - Table 1 : Characteristic data of the nanofiller-contained clear films - Table 2 : Outdoor exposure tests of the nanofiller-contained multicolored films (2.5 months) - Table 3 : Outdoor exposure tests of the nanofiller-contained multicolored films and references (6 months) DOI : https://doi.org/10.1007/s11998-021-00541-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00541-6.pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37164 [article]

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