Excess Charge in Polyampholytes

Details Excess Charge in Polyampholytes Excess Charge in Polyampholytes

1994-04-14

arxiv.org/abs/cond-mat/9404041v2

Europhysics Letters 27, 643-648 (1994)

Physics

Condensed Matter

11 pages, TeX, 3 uuencoded postscript figures

Scientific paper

10.1209/0295-5075/27/9/002

Polyampholytes (PAs) are polymers composed of (quenched) random sequences of positive and negatively charged monomeric groups. We show that the radius of gyration, $R_g$, of a PA strongly depends on its overall excess charge $Q$, and is very weakly influenced by other aspects of the sequence. For $QQ_c$ it is stretched. Some aspects of this behavior can be understood by analogy with the shape instability of a charged drop where the Rayleigh charge plays the role of $Q_c$.

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