期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 277, 期 1-3, 页码 171-176出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2005.11.058
关键词
surfactants; phase diagram; time resolved X-ray diffraction; isotope effects
The liquid-crystalline phases of C(16)TAB/H2O and C(16)TAB/D2O lyotropic systems, at high concentrations (60.0-90.0 wt% surfactant) have been investigated in the temperature range of 30-120 degrees C. Time resolved X-ray diffraction (TRXRD) with synchrotron radiation was applied to record the diffraction spectra at different temperatures over this range. We have obtained highly resolved phase diagrams of the two systems and identified hexagonal, cubic, lamellar and 2D monoclinic (deformed hexagonal) phases. Isotope effects appear when H2O is substituted by D2O at comparable molar concentrations Of surfactant. Particularly where: (1) about 2 degrees C higher (hexagonal-monoclinic) phase transition temperature, and (2) about 25% larger size hexagonal phase at 31 degrees C. The isotope effects were reduced at higher concentrations and at higher temperatures. The swollen of hexagonal phase in DS, i.e. the secondary isotope effects, is induced by the fact that D2O is a more polar solvent than H2O. (c) 2005 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据