pH-Sensitive Controlled Motion of Micrometer-sized Oil Droplets in a Solution of Surfactants Containing Fumaric Acid Derivatives

Mari Kaburagi, Tomoya Kojima, Kouichi Asakura, Taisuke Banno

Research output: Contribution to journalArticlepeer-review

Abstract

Self-propelled droplets are of considerable interest as an appropriate model for understanding the self-propulsion of objects in the fields of nonequilibrium physics and nonlinear science. Several research groups have reported the monodirectional motion of droplets, that is, chemotaxis, using stimuli-responsive materials. However, the precise control of chemotaxis remains challenging from the perspective of synthetic chemistry because chemotactic motion is primarily induced by the consumption of reactive oil or surfactants. Herein, we report a chemical system containing pH-responsive fumaric acid derivatives, in which the oil droplet exhibited positive chemotaxis over a wide pH range–from basic to acidic conditions. From the measurements of the interfacial tension between the oil and aqueous phases, it was deduced that the positive chemotaxis was due to heterogeneity in the interfacial tension of the droplet surface, which was accompanied by the production of surface-active compounds in the pH gradient in a linear-type channel.

Original languageEnglish
Pages (from-to)1319-1326
Number of pages8
JournalJournal of oleo science
Volume71
Issue number9
DOIs
Publication statusPublished - 2022

Keywords

  • chemotaxis
  • Marangoni effect
  • pH gradient
  • self-propelled droplets
  • surfactants

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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