Neutron spin-echo investigation of the dynamics of block copolymer micelles

被引：18

作者：

Castelletto, V ^{[1
]}

Hamley, IW

Yang, Z

Haeussler, W

机构：

[1] Univ Leeds, Dept Chem, Leeds LS2 9JT, W Yorkshire, England

[2] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France

来源：

JOURNAL OF CHEMICAL PHYSICS | 2003年 / 119卷 / 15期

关键词：

D O I：

10.1063/1.1609195

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The dynamics of E92B18 (E=OCH2CH2: oxyethylene, B=OCH2CH(C2H5): oxybutylene; the subscripts are the number of repeats) block copolymer micelles is investigated by neutron spin-echo (NSE). The dynamics of chains in E92B18 micelles is investigated in the hard gel and soft gel phases of the E92B18 in D2O, as well as in the micellar solution. NSE revealed the presence of two dynamic modes, i.e., "fast" and "slow" modes, which are observed independent of the phase, i.e., micellar liquid, soft gel or hard gel. A "slow" mode that dominates at low scattering angles corresponds to the translational diffusion of micelles, the micellar size R-s being in good agreement with the apparent hydrodynamic radius from dynamic light scattering experiments on a dilute solution. An additional "fast" mode was observed, and ascribed to internal "blob scattering" in the micellar corona. (C) 2003 American Institute of Physics.

引用

页码：8158 / 8161

页数：4

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