Adsorption of phytosterol ethoxylates on silica in an aprotic room-temperature ionic liquid

Kenichi Sakai, Yosuke Onuma, Kanjiro Torigoe, Simon Biggs, Hideki Sakai, Masahiko Abe

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)3244-3248
Number of pages5
Issue number7
Publication statusPublished - 5 Apr 2011
Externally publishedYes


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