Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 407, Issue -, Pages 318-326Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2013.06.025
Keywords
Catanionic surfactant mixtures; Phase behavior; Vesicles; Crystallization; Rheological properties
Categories
Funding
- NSFC [20833010]
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Salt-free catanionic mixtures of perfluorononanoic acid (C8F17COOH) and tetradecyltrimethylammonium hydroxide (TFAOH) in aqueous solution show rich and interesting self-assembly properties. With the addition of TTAOH to a C8F17COOH solution, a structural transition from polyhedral vesicles with crystalline bilayers to spherical vesicles with fluid bilayers was observed at room temperature, which was demonstrated by cryo- and FF-TEM observations, DSC and WAXS measurements. It is interesting that both uni-lamellar and multi-lamellar polyhedral vesicles were formed in these fluoro- and hydrocarbon catanionic surfactant mixtures. SAXS measurements were performed to determine the interlamellar spacing of the multi-lamellar polyhedral vesicles. The driving force for the formation of the polyhedral vesicles was the crystallization of the C8F17COO- - TTA(+) ion pairs in the bilayers, which induced the excess anionic surfactants to be segregated and concentrated to produce the vertices of the polyhedral vesicles. Besides, the rheological results show that the rheological properties of the C8F17COOH/TTAOH system are greatly affected by the fluorocarbon chains due to their high rigidity and Krafft point. The solutions consisting of polyhedral vesicles have high viscoelasticity and high yield stress values while spherical vesicle solutions are not viscoelastic. (C) 2013 Elsevier Inc. All rights reserved.
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