Locomotion Mode of Micrometer-Sized Oil Droplets in Solutions of Cationic Surfactants Having Ester or Ether Linkages

Ayana Hirono, Taro Toyota, Kouichi Asakura, Taisuke Banno

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Micrometer-sized self-propelled oil droplets under a far-from-equilibrium condition have drawn much attention because of their potential as a dynamic model for the chemical machinery in living organisms. To clarify the effect of interactions between the system components (surfactant, oil, and water) on the locomotion mode of droplets, we investigated the behaviors of oil droplets composed of n-heptyloxybenzaldehyde (HBA) in solutions of cationic surfactants having or not having an ester or an ether linkage. It was observed that in solutions of cationic surfactants having an ester or an ether linkage, spherical HBA droplets self-propelled by changing their direction frequently. On the other hand, when this functional group is absent, a slow self-propelled motion of the oil droplets concurrent with the evolution of aggregates on their surface was observed. From the results of measurement of interfacial tension and assessment of self-emulsification, we determined that the attractive interactions of cationic surfactants without an ester or an ether linkage with HBA are stronger than those having the linkage. The difference in the locomotion mode of oil droplets is probably explained from the viewpoint of the interactions among the system components.

Original languageEnglish
Pages (from-to)7821-7826
Number of pages6
JournalLangmuir
Volume34
Issue number26
DOIs
Publication statusPublished - 2018 Jul 3

Fingerprint

locomotion
Cationic surfactants
linkages
Ether
micrometers
esters
Ethers
ethers
Esters
Oils
oils
surfactants
machinery
interactions
Emulsification
organisms
dynamic models
interfacial tension
Surface-Active Agents
Functional groups

ASJC Scopus subject areas

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

Cite this

Locomotion Mode of Micrometer-Sized Oil Droplets in Solutions of Cationic Surfactants Having Ester or Ether Linkages. / Hirono, Ayana; Toyota, Taro; Asakura, Kouichi; Banno, Taisuke.

In: Langmuir, Vol. 34, No. 26, 03.07.2018, p. 7821-7826.

Research output: Contribution to journalArticle

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