Polyelectrolytes in the presence of multivalent ions: Gelation versus segregation
Polyelectrolytes in the presence of multivalent ions: Gelation versus segregation
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DOI：
10.1103/physrevlett.90.125504
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发表时间：
2003-03-28
影响因子：
8.6
通讯作者：
de la Cruz, MO
中科院分区：
文献类型：
--
作者：
Ermoshkin, AV;de la Cruz, MO
我们分析了由多价离子等连接物桥联的强电荷链的溶液。由于非交联型单体和离子上的电荷导致的长程静电关联，极大地抑制了由强的短程静电吸引引起的凝胶化。用改进的荷电链交联团簇的德拜-休克尔方法自洽地确定了平均场凝胶化转变。高度稀释的聚电解质溶液倾向于在宏观上分离。如果Bjerrum长度L(B)和沿着链b的相邻带电单体之间的距离都大于离子尺寸a，则半稀溶液可以形成凝胶。
We analyze solutions of strongly charged chains bridged by linkers such as multivalent ions. The gelation induced by the strong short range electrostatic attractions is dramatically suppressed by the long range electrostatic correlations due to the charge along the non-cross-linked monomers and ions. A modified Debye-Huckel approach of cross-linked clusters of charged chains is used to determine the mean field gelation transition self-consistently. Highly dilute polyelectrolyte solutions tend to segregate macroscopically. Semidilute solutions can form gels if the Bjerrum length l(B) and the distance between neighboring charged monomers along the chain b are both greater than the ion size a.