Analysis of stability of macromolecular clusters in dilute heteropolymer solutions

Details Analysis of stability of macromolecular clusters in dilute heteropolymer solutions Analysis of stability of macromolecular clusters in dilute heteropolymer solutions

2000-02-18

arxiv.org/abs/cond-mat/0002307v1

Physics

Condensed Matter

Soft Condensed Matter

30 pages, RevTeX, 14 ps figures. Accepted for publication in J. Chem. Phys

Scientific paper

10.1063/1.481417

We study the formation of clusters consisting of several chains in dilute solutions of amphiphilic heteropolymers. By means of the Gaussian variational theory we show that in a region of the phase diagram within the conventional two-phase coexistence region mesoglobules of equal size possess the lowest free energy. Monte Carlo simulation confirms that the mesoglobules are stabilised due to micro-phase separation, which introduces a preferred length scale. The very existence of such mesoscopic structures is related to a delicate balance of the energetic and entropic terms under the connectivity constraints. The issue of size monodispersity and fluctuations for mesoglobules is investigated.

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