期刊
LANGMUIR
卷 27, 期 10, 页码 5862-5873出版社
AMER CHEMICAL SOC
DOI: 10.1021/la200663v
关键词
-
资金
- International Center for Young Scientists (ICYS), National Institute for Materials Science (NIMS)
- World Premier International (WPI) Center for Materials Nanoarchitectonics (MANA) Japan
Shape, size, and internal structure of nonionic reverse micelle in styrene depending on surfactant chain length, concentration, temperature, and water addition have been investigated using a small-angle X-ray scattering (SAXS) technique. The generalized indirect Fourier transformation (GIFT) method has been employed to deduce real-space structural information. The consistency of the GIFT method has been tested by the geometrical model fittings, and the micellar aggregation number (N-agg) has been determined. It was found that diglycerol monocaprate (C(10)G(2)), diglycerol monolaurate (C(12)G(2)), and diglycerol monomyristate (C(14)G(2)), spontaneously self-assemble into reverse micelles in organic solvent styrene under ambient conditions. The micellar size and the N-agg decrease with an increase in surfactant chain length, a scenario that could be understood from the modification of the critical packing parameter (cpp). A clear picture of one-dimensional (1-D) micellar growth was observed with an increase in surfactant weight fraction (W-s) in the C(10)G(2) system, which eventually formed rodlike micelles at W-s >= 15%. On the other hand, micelles shrunk favoring a rod-to-sphere type transition upon heating. Reverse micelles swelled with water, forming a water pool at the micellar core; the size of water-incorporated reverse micelles was much bigger than that of the empty micelles. Model fittings showed that water addition not only increase the micellar size but also increase the N-agg. Zero-shear viscosity was found to decrease with surfactant chain but increase with W-s, supporting the results derived from SAXS.
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