Behavior of block-polyampholytes near a charged surface

Details Behavior of block-polyampholytes near a charged surface Behavior of block-polyampholytes near a charged surface

2006-08-22

arxiv.org/abs/cond-mat/0608485v1

Physics

Condensed Matter

Soft Condensed Matter

23 pages - 10 eps figs. Submitted for publication

Scientific paper

10.1140/epje/e2007-00041-x

The behavior of polyampholytes near a charged planar surface is studied by means of Monte Carlo simulations. The investigated polyampholytes are overall electrically neutral and made up of oppositely charged units (called blocks) that are highly charged and of the the same length. The influence of block length and substrate's surface-charge-density on the adsorption behavior is addressed. A detailed structural study, including local monomer concentration, monomer mean height, transversal chain size, interface-bond orientation correlation, is provided. It is demonstrated that adsorption is favored for long enough blocks and/or high enough Coulomb interface-ion couplings. By explicitly measuring the chain size in the bulk, it is shown that the charged interface induces either a swelling or a shrinkage of the transversal dimension of the chain depending, in a non trivial manner, on the block length.

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