Colloids and Surfaces A 538 (2018) 73–78 Contents lists available at ScienceDirect Colloids and Surfaces A journal homepage: www.elsevier.com/locate/colsurfa Eﬀect of inorganic and organic counterions on interfacial properties of oleic acid-based gemini surfactants a b a a,c, c Tadashi Sugahara , Yuichiro Takamatsu , Masaaki Akamatsu , Kenichi Sakai , Masahiko Abe , a,c, Hideki Sakai Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan Miyoshi Oil & Fat Co. Ltd., 4-66-1 Horikiri, Katsushika, Tokyo 124-8510, Japan Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan GR APHICAL A BSTRACT ARTICLE I NFO ABSTRACT Keywords: We studied the eﬀect of counterion species of oleic acid-based gemini surfactants with carboxylate headgroups. Gemini surfactant Adsorption and self-aggregation properties were investigated by static surface tension, pyrene ﬂuorescence, Oleic acid dynamic light scattering and phase diagram measurements. We found that, in the case of inorganic counterions Counterion + + + + (Li ,Na ,K , and Cs ), a decreased ion size leads to a decreased critical micelle concentration (cmc) as well as Surface tension a decreased area per surfactant molecule adsorbed at the
Colloids and Surfaces A: Physicochemical and Engineering Aspects – Elsevier
Published: Feb 5, 2018
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