Mode-coupling theory for the slow collective dynamics of fluids adsorbed in disordered porous media
arXiv:cond-mat/0610265 · doi:10.1103/PhysRevE.75.031503
Abstract
We derive a mode-coupling theory for the slow dynamics of fluids confined in disordered porous media represented by spherical particles randomly placed in space. Its equations display the usual nonlinear structure met in this theoretical framework, except for a linear contribution to the memory kernel which adds to the usual quadratic term. The coupling coefficients involve structural quantities which are specific of fluids evolving in random environments and have expressions which are consistent with those found in related problems. Numerical solutions for two simple models with pure hard core interactions lead to the prediction of a variety of glass transition scenarios, which are either continuous or discontinuous and include the possibility of higher-order singularities and glass-glass transitions. The main features of the dynamics in the two most generic cases are reviewed and illustrated with detailed computations. Moreover, a reentry phenomenon is predicted in the low fluid-high matrix density regime and is interpreted as the signature of a decorrelation mechanism by fluid-fluid collisions competing with the localization effect of the solid matrix.
arXiv comment19 pages, 8 figures, accepted for publication in Phys. Rev. E
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