Surface charge of acidic sophorolipid micelles: effect of base and time
Surface charge of acidic sophorolipid micelles: effect of base and time
复制标题
DOI：
10.1039/c3sm50160d
复制
发表时间：
2013-01-01
期刊：
影响因子：
3.4
通讯作者：
Van Bogaert, Inge N. A.
中科院分区：
文献类型：
--
作者：
Baccile, Niki;Pedersen, Jan Skov;Van Bogaert, Inge N. A.
酸性槐糖脂 (SL-COOH) 是生物来源的糖脂，已知可形成胶束，其相互作用随 pH 值而变化。 COOH 基团部分电离后，会发生胶束间相互作用。在这里，我们通过在添加了越来越多 NaOH 的 SL-COOH 溶液上使用小角中子散射 (SANS) 来探索这些相互作用的本质。还通过用 NH3、KOH 和 Ca(OH)(2) 水溶液代替 NaOH 来探索碱性质的影响。还讨论了长达 36 天的时间影响。所有 SANS 数据均已使用具有相互作用势 U(r) 的适当核壳长椭球体模型成功拟合，该模型结合了硬球和屏蔽库仑势（由排斥性汤川势描述）。建模根据胶束尺寸、有效表面电荷和界面水合作用来量化碱的影响，从而显示出随意调整它们的可能性。
Acidic sophorolipids, SL-COOH, bio-derived glycolipids, are known to form micelles whose interactions vary as a function of pH. Upon partial ionization of the COOH group, intermicellar interactions take place. Here, we explore the nature of these interactions by using small angle neutron scattering (SANS) on SL-COOH solutions to which increasing amounts of NaOH are added. The effect of the nature of the base is also explored by replacing NaOH with aqueous NH3, KOH and Ca(OH)(2). Time effects up to 36 days are also discussed. All SANS data have been successfully fitted using an appropriate model of core-shell prolate ellipsoids of revolution with an interaction potential, U(r), which combines hard-sphere and screened Coulomb (described by a repulsive Yukawa potential) potentials. Modelling quantifies the effect of the base in terms of micellar size, effective surface charge and interfacial hydration, thus showing the possibility of tuning them at will.