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    Adsorption and Lubrication of alpha-Gel (alpha-Form Hydrated Crystal) Dispersion at Solid/Liquid Interfaces

    Year: 2021

    Journal: J. Oleo Sci., Volume 70, page 1247–1252

    Authors: Sakai, Kenichi; Ishii, Rina; Saito, Takanori; Akamatsu, Masaaki; Sakai, Takaya; Sakai, Hideki

    Keywords: alpha-gel; alpha-form hydrated crystal; adsorption; lubrication; cationic surfactant; quartz crystal microbalance with dissipation monitoring (QCM-D)

    We characterized the adsorption and desorption of alpha-gel (alpha-form hydrated crystal) dispersions in aqueous media using a quartz crystal microbalance with dissipation monitoring (QCM-D) technique. The alpha-gel was formed from a mixture of N-[3-(dimethylamino)propyl]docosanamide (APA-22) L-lactic acid salt, 1-octadecanol (C18OH), and water. The solid substrate employed in this study as a model for hair was silica. The QCM-D measurements revealed that the alpha-gel dispersions yielded a rigid adsorption film on the negatively charged silica surface. The adsorption mass decreased with decreasing domain size (on the micrometer scale) of the alpha-gel dispersions. The adsorption film highly restricted the desorption of the alpha-gel from the silica surface even after rinsing with water. The adsorption film also exhibited excellent lubrication ability in aqueous media both before and after rinsing with water. We expect that the alpha-gel formed by APA -22 L-lactic acid is a potential ingredient for formulating an environment-friendly hair conditioner owing to its high adsorption, limited desorption, and excellent lubrication abilities on the solid surface.
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