Dynamics of Collapse of flexible Polyelectrolytes and Polyampholytes

Details Dynamics of Collapse of flexible Polyelectrolytes and Polyampholytes Dynamics of Collapse of flexible Polyelectrolytes and Polyampholytes

2000-01-09

arxiv.org/abs/cond-mat/0001094v1

Physics

Condensed Matter

Soft Condensed Matter

14 pages, 2 figures

Scientific paper

10.1021/ma001604q

We provide a theory for the dynamics of collapse of strongly charged polyelectrolytes (PEs) and flexible polyampholytes (PAs) using Langevin equation. After the initial stage, in which counterions condense onto PE, the mechanism of approach to the globular state is similar for PE and PA. In both instances, metastable pearl-necklace structures form in characteristic time scale that is proportional to N^{4/5} where N is the number of monomers. The late stage of collapse occurs by merger of clusters with the largest one growing at the expense of smaller ones (Lifshitz- Slyozov mechanism). The time scale for this process T_{COLL} N. Simulations are used to support the proposed collapse mechanism for PA and PE.

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