NMR velocimetry and spectroscopy at microscopic resolution in small rheometric devices
NMR velocimetry and spectroscopy at microscopic resolution in small rheometric devices
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小型流变装置中微观分辨率的 NMR 测速和光谱
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
K. M. Owens
中科院分区：
文献类型：
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作者：
Melanie M. Britton;P. T. Callaghan;M. Kilfoil;Ross W. Mair;K. M. Owens
我们描述了在标准宽口径微成像系统的核磁共振探头中使用的几种不同的流变设备。这些包括垂直和水平库埃特池和产生剪切流的锥板池，以及产生拉伸流的四辊研磨机和对射流（错流连接）池。我们证明可以获得每个图像的速度图像，并且可以提取有关局部剪切和延伸率的详细信息。这些系统在研究非牛顿粘度以及剪切或拉伸下的分子有序性方面具有相当大的潜力。
We describe several different rheometric devices for use within the nuclear-magnetic-resonance probe of a standard widebore microimaging system. These include both vertical and horizontal Couette cells and the cone- and -plate cell, which produce shearing flows, and the four-roll mill and the opposed-jet (cross-flow junction) cells which produce extensional flow. We demonstrate that velocity images can be obtained for each and that detailed information about local shear and extension rates can be extracted. These systems have considerable potential for use in the study of non-Newtonian viscosity, and of molecular ordering under shear or extension.