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Nanoscale imaging and quantification of the impact of covalently linked lipids on the hair's surface
Author(s) -
Luengo G. S.,
Hallegot P.,
Leroy F.
Publication year - 2006
Publication title -
international journal of cosmetic science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 62
eISSN - 1468-2494
pISSN - 0142-5463
DOI - 10.1111/j.1467-2494.2006.00307_1.x
Subject(s) - monolayer , nanoscopic scale , chemistry , nanolithography , secondary ion mass spectrometry , analytical chemistry (journal) , microscopy , nanotechnology , chemical engineering , mass spectrometry , materials science , organic chemistry , chromatography , optics , biochemistry , physics , medicine , alternative medicine , engineering , pathology , fabrication
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.