title: Adsorption of dimethyl silicone onto hair-surface models prepared with micro-phase separated monolayers.
abstract: The adsorption of dimethylsilicone (DMS) from its emulsion onto hair-surface models was investigated. The model surfaces were prepared on silicon wafers by utilizing a micro-phase separation in mixed Langmuir monolayers with a chemically adsorptive organosilane, n-octadecyltriethoxysilane (ODTES), as one component. The resulting surfaces consisted of hydrophobic micro-domains of polymerized ODTES and a surrounding hydrophilic surface silanol (SiOH) region of the silicon wafer, corresponding to the healthy and damaged regions of the hair surface, respectively, in terms of surface wettability. DMS preferentially adsorbed onto the high surface energy hydrophilic region of the model surface when the hydrophobic micro-domains were composed of fully condensed alkyl chains. The surface energy of the micro-domains could be controlled by using palmitic acid (PA) as the second component to form the micro-domains in the phase-separated Langmuir monolayers. The increase in the surface energy of the micro-domains induced the adsorption of DMS onto the intrinsically hydrophobic domain surface.
authors.affiliation: Research and Development Headquarters, LION Corporation.
authors.forename: Motohiro
authors.initials: M
authors.lastname: Kageyama
authors.forename: Yuuki
authors.initials: Y
authors.lastname: Yahiro
authors.forename: Sonomi
authors.initials: S
authors.lastname: Karube
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Shiraku
authors.forename: Teiji
authors.initials: T
authors.lastname: Kato
authors.forename: Norihiro
authors.initials: N
authors.lastname: Kato
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Kashiwai
authors.forename: Masako
authors.initials: M
authors.lastname: Nomura
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Nishida
authors.forename: Narumi
authors.initials: N
authors.lastname: Tagaki
authors.forename: Ken-ichi
authors.initials: K
authors.lastname: Iimura
mesh_terms: D000327:Adsorption; D004655:Emulsions; D006197:Hair; D006203:Hair Preparations; D057927:Hydrophobic and Hydrophilic Interactions; D021962:Membrane Microdomains; D008567:Membranes, Artificial; D018625:Microscopy, Atomic Force; D008954:Models, Biological; D017646:Organosilicon Compounds; D019308:Palmitic Acid; D012821:Silanes; D017655:Silicon Compounds; D012828:Silicones; D013499:Surface Properties; D017155:Wettability
chemical_list: D004655:Emulsions; D006203:Hair Preparations; D008567:Membranes, Artificial; D017646:Organosilicon Compounds; D012821:Silanes; D017655:Silicon Compounds; D012828:Silicones; C082343:silanol; D019308:Palmitic Acid; C102207:n-octadecyltrimethoxysilane