Densely Stacked Multilamellar and Oligovesicular Vesicles, Bilayer Cylinders, and Tubes Joining with Vesicles of a Salt-Free Catanionic Extractant and Surfactant System
详细信息 查看全文
- 作者：Zaiwu Yuan ; Zhilei Yin ; Sixiu Sun ; Jingcheng Hao
- 刊名：Journal of Physical Chemistry B
- 出版年：2008
- 出版时间：February 7, 2008
- 年：2008
- 卷：112
- 期：5
- 页码：1414 - 1419
- 全文大小：617K
- 年卷期：v.112,no.5(February 7, 2008)
- ISSN：1520-5207
文摘
In the phase diagram of an excellent extractant of rare earth metal ions, di(2-ethylhexyl) phosphate (HDEHP,commercial name P204), mixing with a cationic trimethyltetradecylammonium hydroxide (TTAOH) in water,a birefringent L
phase was found, which consists of densely stacked multilamellar vesicles. The denselystacked multilamellar vesicles are remarkably deformed, as observed by means of cryotransmission electronmicroscopy (cryo-TEM). Further, self-assembled structures-oligovesicular vesicles, bilayer cylinders, andtubes joining with vesicles-were also observed. The self-assembled phase is transparent, anisotropic, andhighly viscous, possessing elastic properties determined by rheological measurements. This is the first timethat birefringent L phase with remarkably deformed amphiphilic bilayer membranes has been constructedthrough combining a hydrophobic organic extractant having double chains with a water-soluble surfactanthaving a single chain, which may direct primarily toward acquiring an understanding of the mechanism ofsalt-free catanionic vesicles and secondarily to determine if vesicle-extraction technology utilizing extractantsis possible.
phase was found, which consists of densely stacked multilamellar vesicles. The denselystacked multilamellar vesicles are remarkably deformed, as observed by means of cryotransmission electronmicroscopy (cryo-TEM). Further, self-assembled structures-oligovesicular vesicles, bilayer cylinders, andtubes joining with vesicles-were also observed. The self-assembled phase is transparent, anisotropic, andhighly viscous, possessing elastic properties determined by rheological measurements. This is the first timethat birefringent L phase with remarkably deformed amphiphilic bilayer membranes has been constructedthrough combining a hydrophobic organic extractant having double chains with a water-soluble surfactanthaving a single chain, which may direct primarily toward acquiring an understanding of the mechanism ofsalt-free catanionic vesicles and secondarily to determine if vesicle-extraction technology utilizing extractantsis possible.