采用魔角旋转脉冲场梯度核磁共振对受限向列相液晶进行扩散研究。

Diffusion studies in confined nematic liquid crystals by MAS PFG NMR.

作者信息

Romanova Ekaterina E, Grinberg Farida, Pampel André, Kärger Jörg, Freude Dieter

机构信息

Abteilung Grenzflächenphysik, Universität Leipzig, Linnéstr. 5, 04103 Leipzig, Germany.

出版信息

J Magn Reson. 2009 Feb;196(2):110-4. doi: 10.1016/j.jmr.2008.10.015. Epub 2008 Oct 25.

DOI:10.1016/j.jmr.2008.10.015

PMID:19006677

Abstract

Pulsed field gradient (PFG) NMR and magic-angle spinning (MAS) NMR have been combined in order to measure the diffusion coefficients of liquid crystals in confined geometry. Combination of MAS NMR with PFG NMR has a higher spectroscopic resolution in comparison with conventional PFG NMR and improves the application of NMR diffusometry to liquid crystals. It is found that the confinement of the liquid crystal 5CB in porous glasses with mean pore diameters of 30 and 200 nm does not notably change its diffusion behavior in comparison with the bulk state.

摘要

脉冲场梯度（PFG）核磁共振与魔角旋转（MAS）核磁共振相结合，用于测量受限几何结构中液晶的扩散系数。与传统的PFG核磁共振相比，MAS核磁共振与PFG核磁共振相结合具有更高的光谱分辨率，并改善了核磁共振扩散测量法在液晶中的应用。研究发现，与本体状态相比，平均孔径为30和200nm的多孔玻璃中液晶5CB的受限状态并没有显著改变其扩散行为。