Adsorption of a fluid in an aerogel: integral equation approach

Details Adsorption of a fluid in an aerogel: integral equation approach Adsorption of a fluid in an aerogel: integral equation approach

2001-07-24

arxiv.org/abs/cond-mat/0107507v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

24 pages, 9 figures

Scientific paper

10.1063/1.1420752

We present a theoretical study of the phase diagram and the structure of a fluid adsorbed in high-porosity aerogels by means of an integral-equation approach combined with the replica formalism. To simulate a realistic gel environment, we use an aerogel structure factor obtained from an off-lattice diffusion-limited cluster-cluster aggregation process. The predictions of the theory are in qualitative agreement with the experimental results, showing a substantial narrowing of the gas-liquid coexistence curve (compared to that of the bulk fluid), associated with weak changes in the critical density and temperature. The influence of the aerogel structure (nontrivial short-range correlations due to connectedness, long-range fractal behavior of the silica strands) is shown to be important at low fluid densities.

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