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The diffusion coefficient of a polymer in an array of obstacles is a non-monotonic function of the degree of disorder in the medium
- Source :
- Physics Letters A. 364:448-452
- Publication Year :
- 2007
- Publisher :
- Elsevier BV, 2007.
-
Abstract
- Using Monte Carlo simulations, we have found that there is a surprising non-monotonic dependence of a polymer's diffusion coefficient upon the degree of disorder of the surrounding environment. Starting with a two-dimensional periodic lattice of obstacles, we randomly displace obstacles to create a quenched gel system with a tunable degree of disorder. Very small displacements increase the diffusion coefficient of polymers since they increase the width of the tube through which the polymer chains reptate. As we displace the obstacles further, however, entropic trapping is observed and the diffusion coefficient of the polymer decreases dramatically. This is a striking example of the delicate balance between entropic and frictional effects for a polymer diffusing in a dense system.
- Subjects :
- Physics
chemistry.chemical_classification
Quantitative Biology::Biomolecules
Condensed matter physics
Anomalous diffusion
Monte Carlo method
General Physics and Astronomy
Polymer
Amorphous solid
Condensed Matter::Soft Condensed Matter
Reptation
chemistry
Polymer physics
Effective diffusion coefficient
Statistical physics
Diffusion (business)
Subjects
Details
- ISSN :
- 03759601
- Volume :
- 364
- Database :
- OpenAIRE
- Journal :
- Physics Letters A
- Accession number :
- edsair.doi...........e2bdb5d37d652fc8da65097e59ba2a6b