平衡薄膜中离子的界面电荷和比吸附性：非离子表面活性剂稳定的泡沫膜

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2024-11-05 DOI:10.1016/j.colsurfa.2024.135716

Hidemi Iyota

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引用次数: 0

摘要

为了阐明非离子表面活性剂的吸附对水/空气界面上离子的电荷和比吸附的影响，对非离子表面活性剂稳定的泡沫膜的平衡厚度应用了修正的泊松-波尔兹曼方程。在没有盐的情况下，测量了癸基甲基亚砜稳定的泡沫膜的平衡厚度与恒定分离压力下表面活性剂浓度的函数关系。在表面活性剂浓度较低时，癸基甲基亚砜的吸附增强了负表面电荷的阴离子的特定吸附。在低于 3.5 的低 pH 值条件下，五聚乙二醇单十二烷基醚薄膜的表面之间会发生强烈的相互作用。研究发现，含表面活性剂的水/空气界面等电点为 3.05，而不含表面活性剂的水/空气界面等电点小于 4.4-4.5。

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Interfacial charge and specific adsorption of ions in equilibrium films: Foam film stabilized by nonionic surfactant

In order to clarify the effect of adsorption of nonionic surfactant on the charge and specific adsorption of ions at water/air interface, a modified Poisson-Boltzmann equation was applied to equilibrium thickness of foam films stabilized by nonionic surfactant. Equilibrium thickness of foam films stabilized by decyl methyl sulfoxide in the absence of salt was measured as a function of surfactant concentration at constant disjoining pressure. Specific adsorption of anions, responsible for the negative surface charge, is enhanced by the adsorption of decyl methyl sulfoxide at low surfactant concentration. Strong interaction takes place between surfaces in a pentaethyleneglycol monododecyl ether film at low pH below 3.5. Isoelectric point for the surfactant-loaded water/air interface was found to be 3.05 and smaller than 4.4–4.5 for surfactant-free water/air interface.

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来源期刊

Colloids and Surfaces A: Physicochemical and Engineering Aspects 化学-物理化学

CiteScore

8.70

自引率

9.60%

发文量

2421

审稿时长

56 days

期刊介绍： Colloids and Surfaces A: Physicochemical and Engineering Aspects is an international journal devoted to the science underlying applications of colloids and interfacial phenomena. The journal aims at publishing high quality research papers featuring new materials or new insights into the role of colloid and interface science in (for example) food, energy, minerals processing, pharmaceuticals or the environment.