Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2003-05-06
Physics
Condensed Matter
Soft Condensed Matter
10 pages, 1 figure
Scientific paper
10.1103/PhysRevE.70.021802
We address the response of a random heteropolymer to preferential solvation of certain monomer types at the globule-solvent interface. For each set of monomers that can comprise the molecule's surface, we represent the ensemble of allowed configurations by a Gaussian distribution of energy levels, whose mean and variance depend on the set's composition. Within such a random energy model, mean surface composition is proportional to solvation strength under most conditions. The breadth of this linear response regime arises from approximate statistical independence of surface and volume energies. For a diverse set of monomer types, the excess of solvophilic monomers at the surface is large only for very strong solvent preference, even in the ground state.
Geissler Philip
Grosberg Alexander
Shakhnovich Eugene
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