Spontaneous transport of microparticles across liquid-liquid interfaces

Denzil S. Frost, Miranda Ngan, Lenore Dai

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Transporting micrometer-sized particles through the liquid-liquid interface generally requires high shear force and sometimes surfactant functionalization. Without these aids, particles adhere to the interface due to strong capillary forces (can be on the order of 106 kT). Thus, spontaneous transport of microparticles through the liquid-liquid interface has not yet been reported. However, we present a new phenomenon here: some ionic liquids (ILs) possess powerful extraction capabilities and can cause microparticles to migrate across the interface without the aid of any shear forces. Both single particles and clusters of particles were observed to adsorb to, then "jump" across the interface and finally detach. In the absence of external mixing, particles as large as 4 μm (in diameter) could completely penetrate the IL/water interface, despite the significant adhesive forces. We have presented a hypothesis that these forces were overcome by ions dissolved in the non-IL phase, which helped by covering the particle surfaces, allowing for more favorable interactions with the IL.

Original languageEnglish (US)
Pages (from-to)9310-9315
Number of pages6
JournalLangmuir
Volume29
Issue number30
DOIs
StatePublished - Jul 30 2013

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Spontaneous transport of microparticles across liquid-liquid interfaces'. Together they form a unique fingerprint.

  • Cite this