Improvement of the properties of AZ91D magnesium alloy by treatment with a molten AlCl3–NaCl salt to form an Mg–Al intermetallic surface layer / Meifeng He in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 3 (09/2009)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 3 (09/2009) . - p. 407-411 Titre : Improvement of the properties of AZ91D magnesium alloy by treatment with a molten AlCl3–NaCl salt to form an Mg–Al intermetallic surface layer Type de document : texte imprimé Auteurs : Meifeng He, Auteur ; Lei Liu, Auteur ; Yating Wu, Auteur ; Zhixin Tang, Auteur ; Wenbin Hu, Auteur Année de publication : 2009 Article en page(s) : p. 407-411 Note générale : Bibliogr. Langues : Américain (ame) Tags : Magnesium  alloy  Intermetallic  compounds  Coatings  Corrosion Index. décimale : 667.9 Revêtements et enduits Résumé : A process for surface modification of AZ91D magnesium alloy has been carried out in AlCl3–NaCl molten salts melt at 573 K for 7 h. The process was used to form a diffusion alloying layer on the surface of the sample to improve corrosion resistance. The diffusion alloying layer was mainly composed of Mg–Al intermetallic compounds. The continued immersion test in 5% NaCl solutions displayed that molten salt diffusion-treated specimen had better corrosion resistance compared to the untreated AZ91D specimen. The polarization test indicated that the Mg–Al intermetallic compounds of the layer were an effective corrosion barrier to decrease the corrosion rate for AZ91D magnesium alloy when exposed to 3.5% NaCl solutions. The microhardness values of the Mg–Al intermetallic compounds were higher than those of the substrate. DOI : 10.1007/s11998-008-9132-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9132-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6122 [article]

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Stabilisation and detoxification of henna (Lawsonia inermis L.) extract for hair dye cosmetics by spray-drying encapsulation / Ying Tang in COLORATION TECHNOLOGY, Vol. 135, N° 6 (12/2019)  

[article]  inCOLORATION TECHNOLOGY > Vol. 135, N° 6 (12/2019) . - p. 439-450 Titre : Stabilisation and detoxification of henna (Lawsonia inermis L.) extract for hair dye cosmetics by spray-drying encapsulation Type de document : texte imprimé Auteurs : Ying Tang, Auteur ; Wendan He, Auteur ; Shuyan Yang, Auteur ; Lei Liu, Auteur Année de publication : 2019 Article en page(s) : p. 439-450 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cheveux -- Teinture Colorants végétaux Cosmétiques Encapsulation Extraction (chimie) Henné -- Détoxication Séchage par pulvérisation Stabilité au stockage Index. décimale : 667.3 Teinture et impression des tissus Résumé : Henna (Lawsonia inermis L.) leaves have been widely used as a natural plant colorant for hair dyeing and body art. However, the utilisation of henna dye extract in commercial colour cosmetics is compromised by its potential harmful effects to humans. This study demonstrates that spray-drying encapsulation using maltodextrin and gum arabic as biocompatible polymeric carriers can be used as a promising strategy to detoxify henna dye extract while maintaining its hair dyeing efficiency for cosmetics. Henna extract-loaded microcapsules with an average particle size of 4.1 µm were prepared with an excellent encapsulation efficiency (98.4%) and a negative zeta potential (-34.4 mV). The morphology and physicochemical properties of the microcapsules were characterised by comparison with a spray-dried sample of neat henna extract. The in vitro toxicological results showed that the microencapsulation process significantly reduced the contact toxicity of henna extract towards human epidermal keratinocytes as well as to the eyes and skin. The encapsulated henna extract also exhibited improved storage stability at three different temperatures (4, 25 and 50°C) for 14 days. Furthermore, the microcapsules demonstrated satisfactory hair dyeing efficiency as natural colorants with good colour fastness towards light and washing. Note de contenu : - EXPERIMENTAL : Materials - Henna dye extraction - Spray-drying conditions - Characterisation of HE-loaded - Storage stability - Assessment of in vitro toxicity - Dyeing efficiency and colour fastness - Statistics - RESULTS AND DISCUSSION : Microcapsules characteristics - Storage stability at different temperatures - In vitro toxicity - Hair dyeing efficiency and colour fastness DOI : 10.1111/cote.12433 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12433 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33376 [article]

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