FLUID STRUCTURE IN SUPERCRITICAL XENON BY NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY AND SMALL ANGLE X-RAY SCATTERING
FLUID STRUCTURE IN SUPERCRITICAL XENON BY NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY AND SMALL ANGLE X-RAY SCATTERING
复制标题
核磁共振波谱和小角 X 射线散射研究超临界氙中的流体结构
DOI：
10.1021/j100097a009
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
C. Yonker
中科院分区：
文献类型：
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作者：
D. M. Pfund;T. Zemanian;J. Linehan;J. Fulton;C. Yonker
在25[degree]C下，对于密度在5 [times] 10[sup-3]和2.2 [times] 10[sup-2] mol/cm[sup 3]之间，对应于压力在50和1000 bar之间，给出了[sup 129] π的化学位移。还介绍了氙在28和45[度]C和30和400巴之间的压力下的小角X射线散射结果。散射结果表明，在临界密度附近的聚集和相关长度的预期增加。的化学位移表现出偏离二阶维里方程在很宽的密度范围。这些偏差在积分方程理论的计算中也很明显。从笼模型的溶剂最近的邻居，由于排斥溶剂化效应的偏离作为这些偏差的可能来源进行了讨论。参考文献45篇，图12，1个选项卡。
Chemical shifts for [sup 129]Xe at 25[degrees]C are presented for densities between 5 [times] 10[sup -3] and 2.2 [times] 10[sup -2] mol/cm[sup 3], corresponding to pressures between 50 and 1000 bar. Also presented are small angle X-ray scattering results for xenon at 28 and 45[degrees]C and pressures between 30 and 400 bar. The scattering results reveal the expected increase in aggregation and correlation length near the critical density. The chemical shifts exhibit deviations from the second-order virial equation over a broad range of densities. These deviations are also evident in calculations from integral equation theory. A departure from the cage model of solvent nearest neighbors due to repulsive solvation effects is discussed as a possible source of these deviations. 45 refs., 12 figs., 1 tab.