Thin-Thick Transition of Foam Film Driven by Surface Phase Transition of Cationic Surfactant - Alkane Mixed Adsorbed Film

2016 Fiscal Year Final Research Report

• Project/Area Number: 26400434
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Biological physics/Chemical physics/Soft matter physics
• Research Institution: Kyushu University
• Principal Investigator: Matsubara Hiroki 九州大学, 理学研究院, 准教授 (00372748)
• Research Collaborator: IKEDA Norihiro 福岡女子大学, 国際文理学部, 教授 (30211030)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 界面活性剤 / 吸着膜相転移 / 泡膜の安定性 / 電気二重層

Outline of Final Research Achievements

A basic unit of foam is a thin aqueous film stabilized by surfactant adsorbed films and, in order to prevent foam film from rapturing, some sort of repulsion across the foam film is required. The metastable foam film stabilized by electrical double layer repulsion between adsorbed films is called a common black film (CBF). One of the unique features of CBFs is the thinning transition to a Newton black film (NBF) in which the electrical repulsion is diminished by added electrolyte, and the overlap of the hydration shells of surfactant head groups stabilized the foam film. In this work, we demonstrated that the first example of the temperature-driven thinning transition between different-thickness CBFs. The phase transition of the surfactant-alkane mixed adsorbed film was used for this purpose. Similar procedure was also applied to stabilize OW emulsions.

Free Research Field

界面科学