Direct observation of shear-induced orientational phase coexistence in a lyotropic system using a modified X-ray surface forces apparatus

被引：32

作者：

Golan, Y ^{[1
]}

Martin-Herranz, A

Li, Y

Safinya, CR

Israelachvili, J

机构：

[1] Univ Calif Santa Barbara, Dept Mat, Dept Chem Engn, Santa Barbara, CA 93106 USA

[2] Univ Calif Santa Barbara, Mat Res Lab, Santa Barbara, CA 93106 USA

[3] Ben Gurion Univ Negev, Dept Mat Engn, IL-84105 Beer Sheva, Israel

[4] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA

[5] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[6] Univ Calif Santa Barbara, Mat Res Lab, Santa Barbara, CA 93106 USA

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 86卷 / 07期

关键词：

D O I：

10.1103/PhysRevLett.86.1263

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The second generation x-ray surface forces apparatus (XSFA-II) allows for the first time simultaneous in situ small-angle x-ray scattering and surface force measurements. We have used the XSFA-II to monitor shear-induced orientational transitions in a lyotropic model lubricant system. Upon applying small shear amplitudes (similar to 20 mum) to a relatively thick (similar to 800 mum) film, we observed evidence for the formation of an orientational boundary layer at the shearing surface. Time-resolved x-ray diffraction revealed the gradual transition to shear-favored orientation by growth of the boundary layer.

引用

页码：1263 / 1266

页数：4

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