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首页> 外文会议>American Chemical Society(ACS) National Meeting; 2002; Boston,MA; US >Characterization Mesoscale Structure and Phenomena in Fluids Using NMR
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Characterization Mesoscale Structure and Phenomena in Fluids Using NMR

机译：使用NMR表征流体的中尺度结构和现象

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摘要

NMR techniques can provide valuable insight into the structure and dynamics of mesoscale structures. Line broadening and spin relaxation effects, which researchers interested in small molecule NMR often work hard to eliminate, can yield detailed information about molecular motion, particularly reorientation processes. They have been used to characterize molecular dynamics and order in alkyl chains, water, or counter-ions participating in mesoscale structures, and to study protein dynamics. Multi-component self-diffusion techniques (such as FT-PGSE) provide information on molecular displacements over longer time scales (picoseconds to microseconds). The self-diffusion rate of a molecule can reveal its aggregation state (is it part of a larger structure?). Under carefully controlled conditions it can also reveal information about the medium through which it is diffusing (viscosity, concentration and structure of materials obstructing its path). Multi-component FT-PGSE has been used to characterize mixed micelles and to study polymer/ surfactant aggregates. Recent developments have extended the utility of these methods. Continued and expanded application to the study of mesoscale phenomena can be foreseen.
机译：NMR技术可以为中尺度结构的结构和动力学提供有价值的见解。对小分子NMR感兴趣的研究人员经常努力消除谱线展宽和自旋弛豫效应，这些谱线可以产生有关分子运动，尤其是重新取向过程的详细信息。它们已用于表征参与中尺度结构的烷基链，水或抗衡离子中的分子动力学和有序性，并研究蛋白质动力学。多组分自扩散技术（例如FT-PGSE）提供了较长时间范围（皮秒至微秒）内分子位移的信息。分子的自扩散速率可以揭示其聚集状态（是否是更大结构的一部分？）。在精心控制的条件下，它还可以显示有关扩散介质的信息（阻碍其传播的物质的粘度，浓度和结构）。多组分FT-PGSE已用于表征混合胶束并研究聚合物/表面活性剂聚集体。最近的发展扩展了这些方法的实用性。可以预见在中尺度现象研究中将继续和扩大应用。

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