Reverse-selective diffusion in nanocomposite membranes

被引:31
作者
Hill, RJ [1 ]
机构
[1] McGill Univ, Dept Chem Engn, Montreal, PQ H3A 2B2, Canada
[2] McGill Univ, McGill Inst Adv Mat, Montreal, PQ H3A 2B2, Canada
关键词
D O I
10.1103/PhysRevLett.96.216001
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The permeability of certain polymer membranes with impenetrable nanoinclusions increases with the particle volume fraction [T. C. Merkel , Science 296, 519 (2002)]. The discovery contradicts qualitative expectations based on Maxwell's classical theory of conduction or diffusion in composites with homogeneous phases. This Letter presents a theory based on an hypothesis that polymer chains are repelled from the inclusions during membrane casting. The accompanying increase in free volume, and hence solute diffusivity, yields bulk transport properties that are in good agreement with experiments.
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页数:4
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