Journal
SOFT MATTER
Volume 11, Issue 28, Pages 5624-5631Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5sm01084e
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Funding
- National Nature Science Foundation of China [21203162, 21073156]
- Research Fund for the Doctoral Program of Higher Education of China [20113250110007]
- Natural Science Fund for Colleges and Universities in Jiangsu Province [13KJ13150040]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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A highly viscoelastic fluid formed by the ionic liquid-type surfactant 1-hexadecyl-3-nonyl imidazolium bromide ([C(16)imC(9)]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). [C(16)imC(9)] 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 [C(16)imC(9)] 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.
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