论文标题
离子关联在多型聚糖的重点相分离中的现场理论描述
Field theory description of ion association in re-entrant phase separation of polyampholytes
论文作者
论文摘要
在溶液中研究了几种不同的整体中性聚糖种（零净电荷）的相位分离，并用两个相对充满电的离子物种在溶液中研究，它们可以通过缔合反应形成离子对。特此给出了系统的现场理论描述，该系统将处理依赖性静电相互作用以及排除的体积效应。有趣的是，使用随机相近似和场理论模拟对模型的分析始终显示出高离子浓度以高离子浓度分离的证据，而离子降低时体积的总体下降。为了说明我们理论框架的后果，在恒定温度条件下进行了几种多聚体浓度与离子浓度相图，以阐明相位分离行为对多增压液序列电荷模式的依赖性，以及离子-PAIR解离常数，对溶剂效应，溶剂效应，离子均衡，离子效果，离子质量和温度。
Phase separation of several different overall neutral polyampholyte species (with zero net charge) is studied in solution with two oppositely charged ion species that can form ion-pairs through an association reaction. A field theory description of the system, that treats polyampholyte charge sequence dependent electrostatic interactions as well as excluded volume effects, is hereby given. Interestingly, analysis of the model using random phase approximation and field theoretic simulation consistently show evidence of a re-entrant polyampholyte phase separation at high ion concentrations when there is an overall decrease of volume upon ion-association. As an illustration of the ramifications of our theoretical framework, several polyampholyte concentration vs ion concentration phase diagrams under constant temperature conditions are presented to elucidate the dependence of phase separation behavior on polyampholyte sequence charge pattern as well as ion-pair dissociation constant, volumetric effects on ion association, solvent quality, and temperature.
