利用 131Xe NMR 谱中的四极位移检测液晶的双轴各向异性。
Detection of phase biaxiality in liquid crystals by use of the quadrupole shift in 131Xe NMR spectra.
机构信息
NMR Research Group, Department of Physics, University of Oulu, Finland.
出版信息
Phys Rev Lett. 2011 Jan 7;106(1):017801. doi: 10.1103/PhysRevLett.106.017801. Epub 2011 Jan 4.
An experimental method to unambiguously distinguish between uniaxial and biaxial liquid crystal phases is introduced. The method is based on the second order quadrupole shift (SOQS) observable in 131Xe NMR spectra of xenon dissolved in liquid crystals. It is shown that besides revealing the biaxiality, the 131Xe SOQS offers a novel method to determine the tilt angle in smectic C phases. As an example, the 131Xe SOQS in a ferroelectric liquid crystal is reported. It yields up a biaxial phase in between isotropic and smectic C phases.
介绍了一种能够明确区分单轴和双轴液晶相的实验方法。该方法基于氙气在液晶中溶解的 131Xe NMR 光谱中的二阶四极矩位移（SOQS）可观测性。结果表明，除了揭示双轴性之外，131Xe SOQS 还提供了一种确定近晶 C 相倾斜角的新方法。作为一个例子，报告了铁电液晶中的 131Xe SOQS。它在各向同性相和近晶 C 相之间产生了双轴相。
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