|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'504'585
Articles rated: 2609
24 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Dynamic arrest of colloids in porous environments: disentangling crowding and confinement | | Jan Kurzidim
; Daniele Coslovich
; Gerhard Kahl
; | | Date: |
6 Dec 2010 | | Abstract: | Using numerical simulations we study the slow dynamics of a colloidal
hard-sphere fluid adsorbed in a matrix of disordered hard-sphere obstacles. We
calculate separately the contributions to the single-particle dynamic
correlation functions due to free and trapped particles. The separation is
based on a Delaunay tessellation to partition the space accessible to the
centres of fluid particles into percolating and disconnected voids. We find
that the trapping of particles into disconnected voids of the matrix is
responsible for the appearance of a nonzero long-time plateau in the
single-particle intermediate scattering functions of the full fluid. The
subdiffusive exponent $z$ obtained from the logarithmic derivative of the
mean-squared displacement of the full fluid is found to be essentially
unaffected by the motion of trapped particles. The value $z = z_{
m free} =
0.5$ observed close to the percolation transition agrees with the prediction of
mode-coupling theory along the diffusion-localisation line as well as with the
one expected for single-file diffusion. We also reveal subtle effects of
dynamic heterogeneity in both the free and the trapped component of the fluid
particles, and discuss microscopic mechanisms that contribute to this
phenomenon. | | Source: | arXiv, 1012.1267 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER