High frequency relaxation in nematic liquid crystal mixtures by brillouin scattering

被引：2
|
作者：
Siny, IG [1 ]
Tu, CS [1 ]
Schmidt, VH [1 ]
机构：
[1] MONTANA STATE UNIV,DEPT PHYS,BOZEMAN,MT 59717
来源：
MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS | 1995年 / 269卷
关键词：
liquid crystal; nematic; relaxation; Brillouin scattering;
D O I：
10.1080/10587259508037326
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
Brillouin scattering as a function of scattering angles from 180 to similar to 10 degrees has been measured in the nematic phases of two liquid crystal mixtures, E. Merck ZLI-2861 and E7, without any preferred orientation. Such measurements at room temperature cover the frequency range from similar to 10 to similar to 1 GHz. The behavior of both the frequency shifts and linewidths is explained by a single time internal relaxation process with the characteristic frequencies 3.2 (ZLI-2861) and 1.2 (E7) GHz respectively. The behavior of the hypersonic attenuation shows no correlation with the static bulk viscosity in the nematic phase.
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页码：125 / 132
页数：8
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