| 微孔膜内大分子有效扩散系数的计算 |
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| 引用本文： | 何志敏.微孔膜内大分子有效扩散系数的计算[J].天津大学学报(英文版),1995(1). |
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| 作者姓名： | 何志敏 |
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| 作者单位： | 大津大学化学工程研究所 |
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| 摘 要： | 报道一种计算分子尺寸与构型对微孔内大分子有效扩散系数影响的理论方法。基于刚性圆球分子在圆柱型孔内的扩散理论，定义分子平均投影半径和水力学球半径，分别用于估算孔内外浓度分配系数和孔内水力学拖曳力。对不同构型的大分子，使用该法计算的有效扩散系数与已发表的实验数据吻合良好。
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| 关 键 词： | 有效扩散系数，微孔膜，分子尺寸，分子构型 |
THEORETICAL EFFECTS OF MOLECULAR DIMENSION AND CONFIGURATION ON EFFECTIVE DIFFUSION COEFFICIENT OF MACROMOLECULES IN MICROPOROUS MEMBRANES |
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| He Zhimin.THEORETICAL EFFECTS OF MOLECULAR DIMENSION AND CONFIGURATION ON EFFECTIVE DIFFUSION COEFFICIENT OF MACROMOLECULES IN MICROPOROUS MEMBRANES[J].Transactions of Tianjin University,1995(1). |
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| Authors: | He Zhimin |
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| Abstract: | This paper presents a theoretical method for predicting the effective diffusion coefficient of macromolecules in the microporous membrfines in view of the effects of molecular dimension and configuration. On the basis of the hindered diffusion theory of spherical neutral macromolecules in a micropore of a long cylinder, the effects of molecular dimension and configuration are studied by defining two molecular dimensions:the mean projected radius to predict the concentration partition and the " hydrodynamically equivalent sphere" radius to evaluate the hydrodynamic reverse drag force. The quantitative comparison shows that the effective diffusion coefficients for different macromolecules predicted by the present method are more consistent with the available published experimental data. |
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| Keywords: | effective diffusion coefficient microporous membrane molecular size molecular configuration |
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