Institute of Experimental Physics, Otto von Guericke University Magdeburg, D-39106 Magdeburg, Germany.
Phys Chem Chem Phys. 2013 May 21;15(19):7204-9. doi: 10.1039/c3cp44055a.
A simple method is proposed to measure the interfacial tension of a smectic liquid crystal (LC) in freely suspended film geometry in aqueous environment. The method is based upon the evaluation of the deformation of smectic bubbles by the buoyancy of a trapped air volume. The advantages over classical suspended smectic droplet experiments in water are the considerably shorter equilibration times, and most important, the much larger density differences between the fluids. The latter allow a much more accurate force determination. Bulk elastic force contributions can be practically neglected in the thin smectic films. Values for a smectic C mixture of two disubstituted phenylpyrimidines are reported.
提出了一种简单的方法来测量水相环境中自由悬挂膜几何形状的近晶相液晶（LC）的界面张力。该方法基于通过捕获的空气体积的浮力评估近晶相气泡的变形。与经典的悬浮近晶液滴实验相比，该方法的优点是平衡时间大大缩短，最重要的是，两种流体之间的密度差大得多。后者可以更准确地确定力。在薄近晶膜中，可以忽略实际的体弹性力贡献。报告了两种取代的苯基嘧啶的近晶 C 混合物的数值。
