DIFFUSION IN BINARY SOLUTIONS
DIFFUSION IN BINARY SOLUTIONS
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DOI：
10.1021/j100863a035
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发表时间：
1967-01-01
影响因子：
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通讯作者：
DOUGLASS, DC
中科院分区：
文献类型：
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作者：
MCCALL, DW;DOUGLASS, DC
报道了苯-环己烷、丙酮-氯仿、丙酮-苯和丙酮-水二元系统的实验自扩散结果。使用核磁共振自旋回波方法将数据记录为25时浓度的函数。结合先前发表的相互扩散结果对数据进行讨论，特别强调方程 D=(d In Oi/d In xx)(xiD¡+ x2Di)（Hartley-Crank 和 Darken）和 D= Di (£> In Oi/d In Ci)（Bearman 和 Eyring）。这些方程是对实验数据的定性描述，但不能定量描述。提出了理论分析，其中互扩散系数和自扩散系数用分子速度相关函数的积分来表示。该分析从分子角度探讨了三个扩散系数，并对 Hartley-Crank 关系的本质提供了一些见解。
Experimental self-diffusion results are reported for the binary systems benzene-cyclo-hexane, acetone-chloroform, acetone-benzene, and acetone-water. Data were recorded as a function of concentration at 25 usingthe nmr spin-echo method. The data are dis-cussed in connection with mutual diffusion results, previously published, with particular emphasis on the equations D=(d In Oi/d In xx)(xiD¡¡+ x2Di)(Hartley-Crank and Darken) and D= Di (£> In Oi/d In Ci)(Bearman and Eyring). These equations are qualitatively but not quantitatively descriptive of the experimentaldata. A theoretical analysis is presented in which the mutual and self-diffusion coefficients are expressed in terms of integrals of molecular velocity correlation functions. This analysis approaches a molecular view of the three diffusion coefficients and gives some insight into the nature of the Hartley-Crank relationship.