Please use this identifier to cite or link to this item:
https://scholarbank.nus.edu.sg/handle/10635/129073
DC Field | Value | |
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dc.title | Dynamics and conformation of polymer chains in a porous medium | |
dc.contributor.author | Foo, G.M. | |
dc.contributor.author | Pandey, R.B. | |
dc.contributor.author | Stauffer, D. | |
dc.date.accessioned | 2016-10-26T11:01:42Z | |
dc.date.available | 2016-10-26T11:01:42Z | |
dc.date.issued | 1996-04 | |
dc.identifier.citation | Foo, G.M.,Pandey, R.B.,Stauffer, D. (1996-04). Dynamics and conformation of polymer chains in a porous medium. Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics 53 (4 SUPPL. B) : 3717-3731. ScholarBank@NUS Repository. | |
dc.identifier.issn | 1063651X | |
dc.identifier.uri | http://scholarbank.nus.edu.sg/handle/10635/129073 | |
dc.description.abstract | Conformational and transport properties of polymer chains in a porous medium are studied using computer simulations. Two types of links between the consecutive nodes of the self-avoiding walk (SAW) chains are considered: (i) constant bond and (ii) flexible (fluctuating) bond. In addition to normal diffusive motion for the global transport of chains, we observe unusual nondiffusive transport phenomena such as subdiffusive power-law dependence of the rms displacement (Rrms) of the chain with time (t), i.e., Rrms=Atk with an exponent k less than 1/2 at low porosity. In two dimensions, we find that the power-law exponent k is nonuniversal as it depends on the barrier concentration (pb) and the chain length (Lc) with the magnitude of k≃0.0-0.5. The chains with flexible bonds exhibit better relaxation with the value of k slightly higher than that for the chains with constant bonds at low porosities. The subdiffusion constant A shows a nonuniversal power-law dependence on the chain length, A∼L-α c, with α≃0.28-1.85 for chains with constant bond, and 0.33-1.27 for chains with flexible bonds. A similar but less pronounced effect of impurity barriers is also observed in three dimensions. The radius of gyration of the chains is affected by the presence of barriers; characteristics of the crossover from a SAW to collapse conformations are reported, along with the anomalous conformation as a function of barrier concentration. | |
dc.source | Scopus | |
dc.type | Article | |
dc.contributor.department | COMPUTATIONAL SCIENCE | |
dc.description.sourcetitle | Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics | |
dc.description.volume | 53 | |
dc.description.issue | 4 SUPPL. B | |
dc.description.page | 3717-3731 | |
dc.description.coden | PLEEE | |
dc.identifier.isiut | NOT_IN_WOS | |
Appears in Collections: | Staff Publications |
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