Necklace model of randomly charged polymers

Yacov Kantor, Mehran Kardar and Deniz Ertaş

Physica A: Statistical Mechanics and its Applications, 1998, vol. 249, issue 1, 301-306

Abstract: Spatial conformations of randomly charged polymers (polyampholytes (PAs)) strongly depend on their total (excess) charge Q. For Q larger (smaller) that some critical value the PA is expanded (collapsed). The transition between the collapsed and the expanded states is reminiscent of the Rayley shape instability of a charged drop. The expanded states can be approximately described using the necklace model, as a chain of interconnected compact globules. Randomness of the charge sequence along the chain modifies the simple model creating wide distribution of sizes of the “beads” of the necklace. A simple mathematical model was proposed to describe the shape of the necklace.

Keywords: Polymer; Polyampholyte; Random walk; Coulomb interaction (search for similar items in EconPapers)
Date: 1998
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:249:y:1998:i:1:p:301-306

DOI: 10.1016/S0378-4371(97)00478-0

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