Locally anisotropic motion in a macroscopically isotropic system: displacement correlations measured using double pulsed gradient spin-echo NMR
Locally anisotropic motion in a macroscopically isotropic system: displacement correlations measured using double pulsed gradient spin-echo NMR
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DOI：
10.1002/mrc.1122
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发表时间：
2002-12-01
影响因子：
2
通讯作者：
Komlosh, ME
中科院分区：
文献类型：
--
作者：
Callaghan, PT;Komlosh, ME
提出了一种新的双脉冲梯度自旋回波核磁共振的应用，其中连续使用两对梯度脉冲来编码自旋磁化强度。这些对施加梯度方向共线和正交，并比较结果。该方法可以用来检测局部扩散各向异性，即使在样品中的畴导向器的分布是各向同性的。共线和正交回波衰减响应之间的差异程度指示该局部各向异性的性质。我们将此方法应用于多畴溶致液晶系统，气溶胶OT-水，并直接检测局部扩散各向异性。版权所有（C）2002约翰威利父子有限公司
We propose a novel application of double pulsed gradient spin-echo NMR in which two pairs of gradient pulses are used successively to encode the spin magnetization. These pairs were applied with gradient directions collinear and orthogonal, and the results were compared. The method can be used to detect local diffusion anisotropy even when the distribution of domain directors in the sample is isotropic. The degree of the difference between collinear and orthogonal echo attenuation responses indicates the nature of that local anisotropy. We applied this method to a polydomain lyotropic liquid crystal system, Aerosol OT-water, and detected the local diffusion anisotropy directly. Copyright (C) 2002 John Wiley Sons, Ltd.