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  • Title: Semiflexible polymer condensates in poor solvents: toroid versus spherical geometries.
    Author: Miller IC, Keentok M, Pereira GG, Williams DR.
    Journal: Phys Rev E Stat Nonlin Soft Matter Phys; 2005 Mar; 71(3 Pt 1):031802. PubMed ID: 15903449.
    Abstract:
    Semiflexible polymers, such as DNA, in the presence of a condensing agent often form toroids. This is due to a balance between bending and surface area free energy penalties. Here we show why in experiments all the toroids have been found to have similar physical size. We also introduce a novel morphology, that of the hollow sphere, which is favored for long polymer chains. This offers the possibility of encapsulating material inside a "vesicle" made of semiflexible polymers. We also consider the case of many such polymer chains placed in a poor solvent. We show a transition between two morphologies occur on increasing concentration of polymer chains, from a thickened toroid to a spherical globule.
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