Theory of dilute polyampholyte solutions in external electrical fields
作者:
Helmut Schiessel,
Alexander Blumen,
期刊:
Macromolecular Theory and Simulations
(WILEY Available online 1997)
卷期:
Volume 6,
issue 1
页码: 103-143
ISSN:1022-1344
年代: 1997
DOI:10.1002/mats.1997.040060108
出版商: Hüthig&Wepf Verlag
数据来源: WILEY
摘要:
AbstractIn this work we display recent findings on the conformations and dynamics of polyampholytes (PAs; polymers with positively and negatively charged monomers) in external electrical fields. We consider the case in which the interactions between the charges are less important (weak coupling limit) and also the case in which they are fundamental (strong coupling case). In the weak coupling limit we present analytical results for Gaussian and also for freely‐jointed chains. Through scaling arguments we discuss the influence of the excluded volume on the PA's configurations. Furthermore we evaluate the dynamics of PAs in the framework of the Rouse and of the Zimm models. In the strong‐coupling regime PAs with vanishing total charge form spherical globules. Using a droplet analogy we examine the response of PAs to external fields and show the onset of an instability reminiscent of a first‐order phase trans
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