Kinetic description of water transport during spontaneous emulsification induced by Span 80

Mao Fukuyama; Tomoko Mizuguchi; Piangrawee Santivongskul; Yuri Ono; Motohiro Kasuya; Arinori Inagawa; Akihide Hibara

doi:10.1039/D3NR06121C

Kinetic description of water transport during spontaneous emulsification induced by Span 80†

Mao Fukuyama,

*^a Tomoko Mizuguchi,

*^b Piangrawee Santivongskul,^a Yuri Ono,^c Motohiro Kasuya,

^d Arinori Inagawa

^e and Akihide Hibara

*^f

Author affiliations

* Corresponding authors

^a Institution of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1, Katahira, Aoba-Ku, Sendai 980-8577, Japan
E-mail: maofukukuyama@tohoku.ac.jp

^b Faculty of Materials Science and Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
E-mail: mizuguti@kit.ac.jp

^c Graduate School of Science and Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan

^d Faculty of Production Systems Engineering and Sciences, Komatsu University, Nu 1-3, Yonchoumemachi, Komatsu, Ishikawa 923-0971, Japan

^e Faculty of Engineering, Utsunomiya University, 7-1-2, Yoto, Utsunomiya, Tochigi 321-8585, Japan

^f Department of Chemistry, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
E-mail: hibara.a.aa@m.titech.ac.jp

Abstract

Spontaneous emulsification is a phenomenon that forms nanometer-sized droplets (nanodroplets) without the application of any external force, and the mechanism has been actively studied for application to various technologies. In this study, we analyzed the kinetics of spontaneous emulsification induced by Span 80. The measurement of water concentration in Span 80 hexadecane solution indicated that the chemical potential of water in the nanodroplets decreased as the amount of water in the nanodroplets decreased. Based on this result, water transport between the aqueous phase and nanodroplets in which the chemical potential of water was controlled was quantitatively investigated by using a microfluidic device. The results demonstrate that the kinetics of water transport during spontaneous emulsification induced by Span 80 was described by a model of osmotic transport through an organic liquid film between the aqueous phase and nanodroplets.

This article is part of the themed collection: Nanoscale 2024 Emerging Investigators

Nanoscale

Kinetic description of water transport during spontaneous emulsification induced by Span 80†

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