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    Adsorption of Phytosterol Ethoxylates on Silica in an Aprotic Room-Temperature Ionic Liquid

    Year: 2011

    Journal: Langmuir, 2011, 27 (7), pp 3244–3248, 20110525

    Authors: Sakai K. *†, Onuma Y.†, Torigoe K. †, Biggs S. ‡, Sakai H. †, Abe M.*†

    Last authors: Masahiko Abe

    Organizations: † Department of Pure and Applied Chemistry in Faculty of Science and Technology and Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan ‡ School of Process, Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, U.K.

    Country: Japan, England, UK, United Kingdom, GB, Great Britain, Britain, U.K.

    The adsorption of a nonionic surfactant at a silica/room-temperature ionic liquid interface has been characterized on the basis of analytical data obtained through a combination of surface force measurements, in situ soft-contact atomic force microscope (AFM) images, and quartz crystal microbalance with dissipation monitoring (QCM-D) data. The surfactant employed in this study is a kind of phytosterol ethoxylate (BPS-20), and the ionic liquid selected here is aprotic 1-ethyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)imide (EmimTFSI). This ionic liquid spontaneously forms solvation layers on silica, being composed of an Emim+ cation layer and EmimTFSI ion pair layers. The addition of BPS-20 disrupts these solvation layers and suggests a surfactant layer adsorbed at the interface. This is the first report demonstrating the adsorption of nonionic surfactants at the solid/aprotic ionic liquid interface.