Dynamics of Polymer Decompression: Expansion, Unfolding and Ejection

Details Dynamics of Polymer Decompression: Expansion, Unfolding and Ejection Dynamics of Polymer Decompression: Expansion, Unfolding and Ejection

2008-08-11

arxiv.org/abs/0808.1484v3

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures. to be published in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.102.148302

The dynamics of polymer decompression, i.e., a process from compressed, compact state to the relaxed swoll en conformation, can be formally described as a {\it nonlinear diffusion}. We discuss here two basic examples: (i) the expansion, or unfolding from a compact state, and (ii) the ejection of pressed polymer through a pore. The problem can be solved exactly for the case (i), but not for the latter. Even in such situations, a scheme called {\it uniform approximation} is shown to be useful to get a physical insight involved. Its application to the case (ii) is able to account for conflicting numerical data in a consistent way.

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