title: Concentration and temperature induced dual-responsive wormlike micelle to hydrogel transition in ionic liquid-type surfactant [C₁₆imC₉]Br aqueous solution without additives.
abstract: A highly viscoelastic fluid formed by the ionic liquid-type surfactant 1-hexadecyl-3-nonyl imidazolium bromide ([C16imC9]Br) in water in the absence of any additive was studied. The phase behavior and morphology of aggregates were studied by a combination of rheological techniques, small-angle X-ray scattering (SAXS), cryo-etch-scanning electron microscopy (cryo-etch-SEM) and freeze-fractured transmission electron microscopy (FF-TEM). [C16imC9]Br aqueous solutions showed interesting rheological behavior as a function of both concentration and temperature, which invoked a transition between wormlike micelles and hydrogels. With the increase in [C16imC9]Br concentration, the aqueous solution could form viscoelastic wormlike micelles (50-80 mM), hydrogels (90-110 mM) and wormlike micelles (120-180 mM). As the temperature increased, the hydrogels (90-110 mM) could also transit to wormlike micelles. The unusual phase transition between wormlike micelles and elastic hydrogels was postulated to be the change of the average micellar length.
authors.affiliation: School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, P. R. China. hanjie@yzu.edu.cn guorong@yzu.edu.cn.
authors.forename: Yimin
authors.initials: Y
authors.lastname: Hu
authors.forename: Lingling
authors.initials: L
authors.lastname: Ge
authors.forename: Jie
authors.initials: J
authors.lastname: Han
authors.forename: Rong
authors.initials: R
authors.lastname: Guo