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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Diffusion of Water in Liquid and Supercritical Carbon Dioxide: An NMR Study
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Diffusion of Water in Liquid and Supercritical Carbon Dioxide: An NMR Study

机译：水在液体和超临界二氧化碳中的扩散：NMR研究

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摘要

Tracer diffusion coefficients have been measured for water in liquid and supercritical carbon dioxide (CO_2) from 10 to 35 ℃ in the pressure range from 130 to 300 bar. The measurements were performed by means of pulsed field gradient NMR (PFG-NMR) methods incorporating compensation for electrical eddy currents and mass convection. In the NMR active volume, the sample was contained in a 1.4 mm i.d. PEEK tube with provisions for recirculation and external sample loading. The diffusion coefficients are consistent with the Stokes-Einstein equation with "slip" boundary conditions and a hydrodynamic radius of 1.7 A for water in the high temperature and low density region. In the low temperature and high density region, the diffusion coefficients indicate either a trend toward "stick" boundary conditions or the dynamic clustering of water molecules.
机译：在130至300 bar的压力范围内，已测量了10至35℃的液态和超临界二氧化碳（CO_2）中水的示踪剂扩散系数。测量是通过脉冲场梯度NMR（PFG-NMR）方法进行的，该方法结合了涡流和质量对流的补偿。在NMR活性体积中，样品的内径为1.4mm。 PEEK管具有再循环和外部样品加载的规定。扩散系数与具有“滑移”边界条件的斯托克斯-爱因斯坦方程一致，并且在高温低密度区域中水的流体动力学半径为1.7A。在低温和高密度区域中，扩散系数表示“粘”边界条件的趋势或水分子的动态聚集。

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