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Polyelectrolyte brushes: Understanding Multivalent Effects on Structure and Properties

聚电解质刷：了解对结构和性能的多价影响

基本信息

批准号：
45564250
负责人：
Professor Dr. Matthias Ballauff
金额：
--
依托单位：
Institut für Chemie und Biochemie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2007
资助国家：
德国
起止时间：
2006-12-31 至 2010-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/45564250?language=en
关键词：
Polyelectrolyte brushes Understanding Multivalent Effects

项目摘要

We propose to study the structure and interaction of polyelectrolyte brushes in presence of multivalent counterions and oppositely charged surfactants. Polyelectrolyte brushes result if long polyelectrolyte chains are grafted to planar surfaces or to colloidal spheres (spherical polyelectrolyte brush). In this way a dense layer of highly charged polymeric chains results that has unique properties. In particular, the counterions balancing the charge of the polyelectrolyte chains are mostly confined within the polyelectrolyte layer in salt-free solution. Adding more and more salt, however, screens the charges and the polyelectrolyte brushes have properties similar to uncharged surface layers of polymers. We plan to study these unique systems in presence of multivalent ions and hydrophobic counterions. Work done by the applicants has shown that the brush layer collapses under these conditions and two such layers may even attract each other. In order to elucidate this in detail, the group of M. Tirrell (UC Santa Barbara) will study planar polyelectrolyte brushes whereas the group of M. Ballauff (University of Bayreuth) will investigate spherical polyelectrolyte brushes. The group of P. Pincus (UC Santa Barbara) will develop theoretical models for both systems. All groups will closely collaborate and exchange students for a prolonged time. We hope to achieve a full understanding of the structure and interaction of these systems.

我们建议研究多价反离子和带相反电荷的表面活性剂存在下的刷的结构和相互作用。如果将长链接枝到平面表面或胶体球上，则会产生聚电解质刷（球形聚电解质刷）。以这种方式，产生具有独特性质的高电荷聚合物链的致密层。特别是，平衡电荷的反离子的反离子链大多被限制在无盐溶液中的反离子层。然而，添加越来越多的盐，屏蔽了电荷，并且这些刷具有与不带电的聚合物表面层相似的性质。我们计划研究这些独特的系统中存在的多价离子和疏水性抗衡离子。申请人所做的工作已经表明，刷层在这些条件下塌陷，并且两个这样的层甚至可以彼此吸引。为了详细阐明这一点，M. Tirrell（加州大学圣巴巴拉分校）将研究平面刷，而M。巴劳夫（拜罗伊特大学）将研究球形刷。Pincus（加州大学圣巴巴拉分校）的小组将为这两个系统开发理论模型。所有小组将密切合作，并交换学生很长一段时间。我们希望能够充分了解这些系统的结构和相互作用。