Interfacial tension between a complex coacervate phase and its coexisting aqueous phase
Interfacial tension between a complex coacervate phase and its coexisting aqueous phase
复制标题
DOI：
10.1039/b911541b
复制
发表时间：
2010-01-01
期刊：
影响因子：
3.4
通讯作者：
van der Gucht, Jasper
中科院分区：
文献类型：
--
作者：
Spruijt, Evan;Sprakel, Joris;van der Gucht, Jasper
复凝聚是正负电荷大离子溶液中的缔合相分离。尽管凝聚在胶束组件(复合凝聚核心胶束)、药物载体和薄膜等方面得到了广泛的应用，但几乎没有关于这种凝聚相(聚电解质复合体)与其共存水相之间的界面张力或盐对其影响的实验数据。本文利用胶体探针AFM测量毛细管附着力，获得了两种高电荷密度聚电解质的复合凝聚相与其共存的水相之间的界面张力。结果表明，界面张力约为100mU N/m，随盐浓度的增加而减小，并在临界点消失。有趣的是，我们发现在分离分离中发现的界面张力的临界标度指数也适用于这里。
Complex coacervation is the associative phase separation in a solution of positively and negatively charged macroions. Despite the widespread use of coacervation in e. g. micellar assemblies ( complex coacervate core micelles), drug carriers and thin films, there is virtually no experimental data on the interfacial tension between such coacervate phases ( polyelectrolyte complexes) and their coexisting aqueous phases or on the influence of salt thereon. In this paper we use colloidal probe AFM measurements of capillary adhesion forces to obtain the interfacial tension between a complex coacervate phase of two polyelectrolytes with high charge density and its coexisting aqueous phase. We find that the interfacial tension is of order 100 mu N/m, decreases with increasing salt concentration and vanishes at the critical point. Interestingly, we find that the critical scaling exponent for the interfacial tension found in segregative demixing also applies here.