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Article overview
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Impact of random obstacles on the dynamics of a dense colloidal fluid | Jan Kurzidim
; Daniele Coslovich
; Gerhard Kahl
; | Date: |
2 Jul 2010 | Abstract: | Using 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 | Services: | Forum | Review | PDF | Favorites |
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