title: Effect of the covalently linked fatty acid 18-MEA on the nanotribology of hair's outermost surface.
abstract: Highly ordered lipids adsorbed or grafted on surfaces are known to provide protection and lubrication custom engineered surfaces. We have used atomic force microscopy (AFM) to measure adhesion and frictional properties of the outermost surfaces of a variety of human hairs with the aim of both understanding the role of 18-methyleicosanoic acid (18-MEA), an unusual branched-chain fatty acid covalently bound to the cuticle surface, and investigating how treatments or the ethnic origin affect this layer. Results show that an unmodified silicon nitride AFM tip is able to detect changes at the hair surface that can be related to the absence or presence of this layer due to treatment conditions and in particular that this monolayer has a lubricant effect.
authors.affiliation: Scanning Probe Microscopy Laboratory, School of Pharmacy and Biomedical Sciences, University of Portsmouth, St. Michael's Building, White Swan Road, Portsmouth PO1 2DT, UK.
authors.forename: Steven
authors.initials: S
authors.lastname: Breakspear
authors.forename: James R
authors.initials: JR
authors.lastname: Smith
authors.forename: Gustavo
authors.initials: G
authors.lastname: Luengo
mesh_terms: D000818:Animals; D004537:Eicosanoic Acids / Q000737:chemistry*; D005006:Ethnicity; D017276:Friction; D006197:Hair / Q000648:ultrastructure*; D006801:Humans; D019811:Hydroxylamine / Q000737:chemistry; D018625:Microscopy, Atomic Force / Q000379:methods*; D015394:Molecular Structure; D013499:Surface Properties
chemical_list: D004537:Eicosanoic Acids; D019811:Hydroxylamine; C111345:18-methyleicosanoic acid