Self-Propelled Oil Droplets and Their Morphological Change to Giant Vesicles Induced by a Surfactant Solution at Low pH

Taisuke Banno, Yuki Tanaka, Kouichi Asakura, Taro Toyota

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Unique dynamics using inanimate molecular assemblies based on soft matter have drawn much attention for demonstrating far-from-equilibrium chemical systems. However, there are no soft matter systems that exhibit a possible pathway linking the self-propelled oil droplets to formation of giant vesicles stimulated by low pH. In this study, we conceived an experimental oil-in-water emulsion system in which flocculated particles composed of a imine-containing oil transformed to spherical oil droplets that self-propelled and, after coming to rest, formed membranous figures. Finally, these figures became giant vesicles. From NMR, pH curves, and surface tension measurements, we determined that this far-from-equilibrium phenomenon was due to the acidic hydrolysis of the oil, which produced a benzaldehyde derivative as an oil component and a primary amine as a surfactant precursor, and the dynamic behavior of the hydrolytic products in the emulsion system. These findings afforded us a potential linkage between mobile droplet-based protocells and vesicle-based protocells stimulated by low pH.

Original languageEnglish
Pages (from-to)9591-9597
Number of pages7
JournalLangmuir
Volume32
Issue number37
DOIs
Publication statusPublished - 2016 Sep 20

Fingerprint

Surface-Active Agents
Oils
Surface active agents
oils
surfactants
Emulsions
emulsions
Imines
linkages
assemblies
imines
Amines
chemical equilibrium
Surface tension
hydrolysis
Hydrolysis
amines
interfacial tension
Nuclear magnetic resonance
Derivatives

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Self-Propelled Oil Droplets and Their Morphological Change to Giant Vesicles Induced by a Surfactant Solution at Low pH. / Banno, Taisuke; Tanaka, Yuki; Asakura, Kouichi; Toyota, Taro.

In: Langmuir, Vol. 32, No. 37, 20.09.2016, p. 9591-9597.

Research output: Contribution to journalArticle

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