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29 March 2024
 
  » arxiv » 1007.0429

 Article overview


Impact of random obstacles on the dynamics of a dense colloidal fluid
Jan Kurzidim ; Daniele Coslovich ; Gerhard Kahl ;
Date 2 Jul 2010
AbstractUsing molecular dynamics simulations we study the slow dynamics of a colloidal fluid. The fluid is "annealed" (allowed to move) within a matrix of obstacles "quenched" from a different, equilibrated colloidal fluid. We choose all particles (fluid and matrix) to be of the same size and to interact as hard spheres, thus retaining all features of the porous confinement while limiting the control parameters to the packing fraction of the matrix, phi_m, and that of the fluid, phi_f. We show the confining obstacles to profoundly impact the relaxation pattern of various quantifiers pertinent to the fluid. Varying the type of quantifier (tagged-particle or collective) as well as phi_m and phi_f, we unveil both discontinuous and continuous arrest scenarios. Also, we find related tagged-particle and collective quantifiers to intricately interplay as they relax. Furthermore, we discover subdiffusive behavior and demonstrate its close connection to the matrix structure. Central to our findings are kinetic diagrams that indicate the state of a fluid property the upon varying phi_m and phi_f. We conduct detailed investigations on several dynamic properties, including the tagged-particle and collective intermediate scattering functions, the mean-squared displacement, and the van Hove function. Our findings partially agree and partially disagree with the various predictions by a recent extension to mode-coupling theory.
Source arXiv, 1007.0429
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