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- W2047029408 abstract "We study the bending rigidity of highly charged stiff polyelectrolytes, for both a single chain and many chains forming a bundle. A theory is developed to account for the interplay between competitive binding of counterions and charge correlations in softening the polyelectrolyte (PE) chains. The presence of even a small concentration of multivalent counterions leads to a dramatic reduction in the bending rigidity of the chains that are nominally stiffened by the repulsion between their backbone charges. The variation of the bending rigidity as a function of f0, the fraction of charged monomers on the chain, does not exhibit simple scaling behavior; it grows with increasing f0 below a critical value of f0. Beyond the critical value, however, the chain becomes softer as f0 increases. The bending rigidity also exhibits intriguing dependence on the concentration of multivalent counterion n2; for highly charged PEs, the bending rigidity decreases as n2 increases from zero, while it increases with increasing n2 beyond a certain value of n2. When polyelectrolyte chains form a N-loop condensate (e.g., a toroidal bundle formed by N turns (winds) of the chain), the interloop coupling further softens the condensate, resulting in the bending free energy of the condensate that scales as N for large N." @default.
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- W2047029408 date "2003-11-20" @default.
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- W2047029408 title "Bending Rigidity of Stiff Polyelectrolyte Chains: A Single Chain and a Bundle of Multichains" @default.
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- W2047029408 doi "https://doi.org/10.1021/ma021226k" @default.
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