Spontaneous transport of microparticles across liquid-liquid interfaces

Denzil S. Frost, Miranda Ngan, Lenore Dai

Research output: Contribution to journalArticle

4 Citations (Scopus)

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

Fingerprint

liquid-liquid interfaces
microparticles
Ionic Liquids
Ionic liquids
Liquids
liquids
shear
Surface-Active Agents
Adhesives
Surface active agents
adhesives
micrometers
Ions
liquid phases
coverings
surfactants
Water
causes
water
ions

ASJC Scopus subject areas

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

Cite this

Spontaneous transport of microparticles across liquid-liquid interfaces. / Frost, Denzil S.; Ngan, Miranda; Dai, Lenore.

In: Langmuir, Vol. 29, No. 30, 30.07.2013, p. 9310-9315.

Research output: Contribution to journalArticle

Frost, Denzil S. ; Ngan, Miranda ; Dai, Lenore. / Spontaneous transport of microparticles across liquid-liquid interfaces. In: Langmuir. 2013 ; Vol. 29, No. 30. pp. 9310-9315.
@article{8bebe5a2916b43ee9e7b3048f4267ffb,
title = "Spontaneous transport of microparticles across liquid-liquid interfaces",
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.",
author = "Frost, {Denzil S.} and Miranda Ngan and Lenore Dai",
year = "2013",
month = "7",
day = "30",
doi = "10.1021/la4022905",
language = "English (US)",
volume = "29",
pages = "9310--9315",
journal = "Langmuir",
issn = "0743-7463",
publisher = "American Chemical Society",
number = "30",

}

TY - JOUR

T1 - Spontaneous transport of microparticles across liquid-liquid interfaces

AU - Frost, Denzil S.

AU - Ngan, Miranda

AU - Dai, Lenore

PY - 2013/7/30

Y1 - 2013/7/30

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84881056259&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84881056259&partnerID=8YFLogxK

U2 - 10.1021/la4022905

DO - 10.1021/la4022905

M3 - Article

VL - 29

SP - 9310

EP - 9315

JO - Langmuir

JF - Langmuir

SN - 0743-7463

IS - 30

ER -