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Nanoscale imaging and quantification of the impact of covalently linked lipids on the hair's surface / Gustavo S. Luengo in IFSCC MAGAZINE, Vol. 8, N° 4 (10-11-12/2005)
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Titre : Nanoscale imaging and quantification of the impact of covalently linked lipids on the hair's surface Type de document : texte imprimé Auteurs : Gustavo S. Luengo, Auteur ; Philippe Hallegot, Auteur ; Frédéric Leroy, Auteur Année de publication : 2005 Article en page(s) : p. 271-276 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Science des surfaces' Cheveu 'Microscopie à force atomique' 'Acide 18-méthyléicosanoique' Index. décimale : 668.5 Parfums et cosmétiques Résumé : The role of 18-methyleicosanoic acid was explored using atomic force microscopy techniques. Treatment with a delipidating agent (hydroxylamine) did not change the hair's morphology but dramatically changed its surface tribological properties, providing a high resolution mapping of the delipidation effect and confirming the importance of the presence of this fatty acid. Using nanolithography we were able to gently scratch the outermost surface layer of hair. The obtained depth of penetration remained constant (12–45 Å) and was very close to the average length of the 18-methyl-eicosanoic acid molecule, supporting the assumed model of an ordered monolayer of 18-methyleicosanoic acid on the surface. Taken together, our results suggest that the lipid covering or its grafting strength may not be evenly distributed over the hair surface. The possibilities of combining nanolithography and an analytical method like time of flight secondary ion mass spectroscopy (ToF-SIMS) are discussed.
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in IFSCC MAGAZINE > Vol. 8, N° 4 (10-11-12/2005) . - p. 271-276[article]Réservation
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