Statistics of a hydrophobic chain near a hydrophobic boundary

Details Statistics of a hydrophobic chain near a hydrophobic boundary Statistics of a hydrophobic chain near a hydrophobic boundary

2002-09-20

arxiv.org/abs/cond-mat/0209483v1

Physics

Condensed Matter

Statistical Mechanics

6 pages text, 11 figures

Scientific paper

We study the behaviour of a hydrophobic chain near a hydrophobic boundary in two dimensions, using the decorated lattice model of Berkema and Widom [G.T. Barkema and B. Widom, J. Chem. Phys. 113, 2349 (2000)] to obtain effective, temperature dependent intrachain and chain-boundary interactions. We use these interactions to construct two model hamiltonians which can be solved exactly. Our results compare favorably with preliminary Monte Carlo computations, using the same effective interactions. At relatively low temperatures and at high temperatures, we find that the chain is randomly configured in the ambient water, and detached from the wall, whereas at intermediate temperatures it adsorbs onto the wall in a stretched or partially folded state, again depending upon the temperature, and the energy of solvation.

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