Fabrication of durable polytetrafluoroethylene superhydrophobic materials with recyclable and self-cleaning properties on various substrates / Jinmei He in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 3 (05-06/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 3 (05-06/2020) . - p. 755–763 Titre : Fabrication of durable polytetrafluoroethylene superhydrophobic materials with recyclable and self-cleaning properties on various substrates Type de document : texte imprimé Auteurs : Jinmei He, Auteur ; Yu Zhao, Auteur ; Mingjuan Yuan, Auteur ; Lingang Hou, Auteur ; Ansar Abbas, Auteur ; Menghui Xue, Auteur ; Xuerui Ma, Auteur ; Jiao He, Auteur ; Mengnan Qu, Auteur Année de publication : 2020 Article en page(s) : p. 755–763 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Auto-nettoyage Caractérisation Durée de vie (Ingénierie) Polytétrafluoréthylène Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Most of the artificial superhydrophobic surfaces easily lose their good water repellency once they are chemically or mechanically damaged, which seriously hinders their practical application. Durable superhydrophobic materials with recyclability, low-temperature resistance, and self-cleaning properties were successfully prepared by employing silica particles and polytetrafluoroethylene via a simple drop-coating method. The as-prepared superhydrophobic materials not only show excellent superhydrophobicity but also display fascinating durability and chemical stability after a series of rigorous tests. Importantly, the debris scraped from the superhydrophobic materials can be recycled and easily reused to prepare new superhydrophobic materials. This facile strategy may pave the way for the scalable and recyclable robust superhydrophobic materials in practical applications. Note de contenu : - Materials - Fabrication of the durable superhydrophobic materials - Characterization DOI : https://doi.org/10.1007/s11998-020-00322-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00322-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34105 [article]

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Fabrication of fluorine-free superhydrophobic coatings from montmorillonite with mechanical durability and chemical stability / Mengnan Qu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 4 (07/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 4 (07/2019) . - p. 1043-1053 Titre : Fabrication of fluorine-free superhydrophobic coatings from montmorillonite with mechanical durability and chemical stability Type de document : texte imprimé Auteurs : Mengnan Qu, Auteur ; Menghui Xue, Auteur ; Mingjuan Yuan, Auteur ; Jiao He, Auteur ; Ansar Abbas, Auteur ; Yu Zhao, Auteur ; Jiaxin Wang, Auteur ; Xiangrong Liu, Auteur ; Jinmei He, Auteur Année de publication : 2019 Article en page(s) : p. 1043-1053 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Essais de comportement au feu Hydrophobie Ignifugeants Composé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface. Montmorillonite Résistance chimique Résistance thermique Revêtements protecteurs Séparation huile/eau Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, durable superhydrophobic coatings were successfully prepared by modifying montmorillonite with stearic acid and organosiloxane, and this procedure was simple, efficient, and environmentally friendly. Different from the previously reported methods, the micro-/nanostructures of the superhydrophobic coatings were constructed by using the abundant natural montmorillonite as the building blocks. The surface topography of the coating was analyzed with a scanning electron microscope, while element compositions and functional groups were characterized by X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy, respectively. The as-prepared superhydrophobic coatings showed excellent wear resistance, and could maintain their superhydrophobicity after sandpaper abrasion for 180 cm in length. Apart from the superb wear resistance, the obtained superhydrophobic coatings also displayed strong acid resistance and anti-UV properties. In addition, the as-coated fabric not only possessed superhydrophobicity and the ability of oil–water separation, but also exhibited excellent fire resistance because of the thermal stability of MMT particles. Notably, the favorable comprehensive performance of the as-prepared coatings was indicative of their potential applications in oil/water separation and some harsh conditions, and as outdoor protective materials. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of superhydrophobic MMT particles - Fabrication of the durable superhydrophobic coatings and superhydrophobic fabric - Characterization - RESULTS AND DISCUSSION : Fabrication of the durable superhydrophobic coatings on various substrates and the measurements of wetting properties - Surface morphology and chemical compositions - Mechanical durability and chemical stability - Oil/water separation - Fire resistance test DOI : 10.1007/s11998-018-00179-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-00179-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32860 [article]

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Oxidising degradation of Valonia extract and utilisation of the products. Part 1. Oxidising degradation of Valonia extract and characterisation of the products / Bi Shi in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 84, N° 6 (11-12/2000)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 84, N° 6 (11-12/2000) . - p. 258-262 Titre : Oxidising degradation of Valonia extract and utilisation of the products. Part 1. Oxidising degradation of Valonia extract and characterisation of the products Type de document : texte imprimé Auteurs : Bi Shi, Auteur ; Ying Di, Auteur ; Youjie He, Auteur ; Lijiang Song, Auteur ; Yu Zhao, Auteur Année de publication : 2000 Article en page(s) : p. 258-262 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aluminium trivalent Chrome trivalent Complexation (chimie) Couleur Extraits de plantes Oxydation Peroxyde d'hydrogène Le peroxyde d'hydrogène (H2O2), communément appelé eau oxygénée ou encore perhydrol (appellation industrielle), est un composé chimique liquide et visqueux, aux puissantes propriétés oxydantes (il est aussi réducteur). C'est donc un agent blanchissant efficace qui sert de désinfectant et (à haute concentration) d'oxydant ou monergol dans les fusées spatiales. Poids moléculaires Résistance chimique Tanins végétaux Valonia et constituants Valonia est un genre d'algues vertes de la famille des Valoniaceae. La taille d'une seule cellule pluri-nucléée peut atteindre 2 cm chez certaines espèces. (Wikipedia) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Oxidation using H2O2 brings about degradation of valonia extract. Three typical products with novel properties were obtained when 20%, 40% and 60% H2O2 (conc. 50%) were used. Determinations indicated that the oxidising reaction leads to lowering of molecular weight, lightening of colour, improving of acid and salting-out resistances and increasing of hydrophilic groups, carboxyl in particular. The more interesting results are that penetrating rates of the degraded products in pelt are markedly accelerated and that the alkali resistance of complex compounds of the products and Cr(III) or Al(III) is considerably increased. The effects above are enhanced with increasing offer of H20.The conditions for oxidising degradation are described and the potentials of utilising the products are discussed. Note de contenu : - EXPERIMENTAL PROCEDURES : Oxidising degradation of valonia extract - Determination of molecular weight distribution - Colour determination - Characterisation of structure - Acid resistance and salting-out effect determinations - Determination of tanning property - Complexing characteristics with Al(III) and Cr (III) - RESULTS AND DISCUSSION - Table 1 : Molecular weight distributions of oxidised degradation products of valonia extracts - Table 2 : The colour of valonia extract and its oxidised degradation products - Table 3 : Precipitate ratios (%) of valonia extract and its oxidised degradation products at different pH* - Table 4 : Precipitate ratios (%) of valonia extract and its oxidised degradation products in NaC1 solution - Table 5 : The tanning properties of valonia extract and its oxidised degradation products* - Table 6 : Precipitating pH of complex solutions of oxidised degradation products and Cr(III) - Table 7 : Precipitating pH of complex solutions of oxidised degradation products and Al(III) En ligne : https://drive.google.com/file/d/1MNgqR-q-yGLMFjML87uHVZ7aRinbwt3x/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40815 [article]

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