title: Surface Activity and Aggregation Behavior of Siloxane-Based Ionic Liquids in Aqueous Solution.
abstract: Six novel siloxane-based surface-active ionic liquids (SAILs)--siloxane ammonium carboxylate [Si(n)N(2)-CA(1), (n = 3, 4)]--were designed and synthesized. Their melting points, surface activities, and self-aggregation behavior in aqueous solution were studied. The results showed that because of the bulky hydrophobic siloxane chains at the end of the tail, all six siloxane-based SAILs are room-temperature ionic liquids (RT-SAILs). The introduction of the siloxane group can reduce the melting point of ionic liquids to below room temperature and can promote the micellization and aggregation behavior more efficiently. These siloxane-based SAILs can greatly reduce the surface tension of water, as shown by the critical aggregation concentration (γCAC) values of 20 mN·m(-1); all six siloxane RT-SAILs can form a vesicle spontaneously in aqueous solution, indicating potential uses as model systems for biomembranes and vehicles for drug delivery.
authors.affiliation: †China Research Institute of Daily Chemical Industry, Taiyuan Shanxi 030001, P.R. China.
authors.forename: Guoyong
authors.initials: G
authors.lastname: Wang
authors.affiliation: †China Research Institute of Daily Chemical Industry, Taiyuan Shanxi 030001, P.R. China.
authors.forename: Ping
authors.initials: P
authors.lastname: Li
authors.affiliation: †China Research Institute of Daily Chemical Industry, Taiyuan Shanxi 030001, P.R. China.|‡Institute of Resources and Environment Engineering, Shanxi University, Taiyuan Shanxi 030006, P.R. China.
authors.forename: Zhiping
authors.initials: Z
authors.lastname: Du
authors.affiliation: †China Research Institute of Daily Chemical Industry, Taiyuan Shanxi 030001, P.R. China.
authors.forename: Wanxu
authors.initials: W
authors.lastname: Wang
authors.affiliation: †China Research Institute of Daily Chemical Industry, Taiyuan Shanxi 030001, P.R. China.
authors.forename: Guojin
authors.initials: G
authors.lastname: Li