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- W1965744909 endingPage "15923" @default.
- W1965744909 startingPage "15910" @default.
- W1965744909 abstract "The morphology of many porous materials is sponge-like. For describing fluid adsorption in such materials, we propose here a quite general sponge model which is built by digging spherical cavities in a continuum. In contrast to the hard-sponge model proposed recently by Zhao et al. [Zhao, S. L.; Dong, W.; Liu, Q. H. J. Chem. Phys. 2006, 125, 244703], the continuum in the present soft-sponge model is permeable to fluid particles. Although the general expression of the fluid−matrix interaction potential is not pair additive, we were able to extend some statistical-mechanics formalism of liquid state to deal with this model. We derived the diagrammatic expansions of various correlation functions and Ornstein−Zernike equations. Usually, one would not expect that the thermodynamic quantities (e.g., internal energy) of a system with a nonpair-additive interaction can be completely determined from the structural information at the two-body level. We found a remarkable result that for the soft-sponge model considered here, the internal potential energy can be determined from only two-body correlation functions. In the particular case of a soft-sponge model with nonoverlapping cavities, we show that the fluid−matrix interaction can be also described by a pair-additive potential. In this case, the Madden−Glandt formalism applies. The Ornstein−Zernike equations obtained by using the pair-additive fluid−matrix interaction potential look to be quite different from those obtained by starting with the nonpair-additive potential. We found the relationship between the two descriptions and show how the two sets of Ornstein−Zernike equations can be transformed from each other for a soft-sponge model with nonoverlapping cavities." @default.
- W1965744909 created "2016-06-24" @default.
- W1965744909 creator A5033629163 @default.
- W1965744909 creator A5077519494 @default.
- W1965744909 creator A5091372177 @default.
- W1965744909 date "2007-10-13" @default.
- W1965744909 modified "2023-09-25" @default.
- W1965744909 title "Fluids Confined in Porous Media: A Soft-Sponge Model" @default.
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