Two-dimensional materials as emulsion stabilizers: Interfacial thermodynamics and molecular barrier properties

Megan A. Creighton, Yuzo Ohata, Jin Miyawaki, Arijit Bose, Robert H. Hurt

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

A new application for two-dimensional (2D) materials is emulsification, where they can serve as ultrathin platelike interfacial stabilizers in two-liquid systems. We present a first detailed thermodynamic analysis of atomically thin 2D materials at organic-aqueous liquid-liquid interfaces and derive expressions for the transfer free energies of emulsion stabilization that account for material geometry, van der Waals transparency or opacity, and variable hydrophobicity. High mass potency is shown to be an intrinsic property of the 2D geometry, which at the atomically thin limit places every atom in contact with both liquid phases, resulting in unit atom efficiency. The thermodynamic model successfully predicts that graphene oxide but not pristine graphene has a favorable hydrophobic-hydrophilic balance for oil-water emulsion stabilization. Multilayer tiling is predicted to occur by the passivation of droplet surface patches left uncovered by packing inefficiencies in the first monolayer, and complete multilayer coverage is confirmed by cryogenic scanning electron microscopy. The molecular barrier function of graphene interfacial films causes a significant suppression of dispersed-phase evaporation rates with potential applications in controlled release. Finally, these emulsions can be used as templates for creating solid graphene foams or graphene microsacks filled with lipophilic cargos. Emerging 2D materials are promising as dispersants or emulsifiers where high mass potency and multifunctional properties are desired.

Original languageEnglish
Pages (from-to)3687-3696
Number of pages10
JournalLangmuir
Volume30
Issue number13
DOIs
Publication statusPublished - Apr 8 2014

Fingerprint

Graphite
Emulsions
Graphene
emulsions
graphene
Thermodynamics
thermodynamics
Liquids
Multilayers
Stabilization
stabilization
Atoms
liquid-liquid interfaces
Emulsification
Geometry
evaporation rate
Opacity
Hydrophobicity
hydrophobicity
geometry

All Science Journal Classification (ASJC) codes

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

Cite this

Two-dimensional materials as emulsion stabilizers : Interfacial thermodynamics and molecular barrier properties. / Creighton, Megan A.; Ohata, Yuzo; Miyawaki, Jin; Bose, Arijit; Hurt, Robert H.

In: Langmuir, Vol. 30, No. 13, 08.04.2014, p. 3687-3696.

Research output: Contribution to journalArticle

Creighton, Megan A. ; Ohata, Yuzo ; Miyawaki, Jin ; Bose, Arijit ; Hurt, Robert H. / Two-dimensional materials as emulsion stabilizers : Interfacial thermodynamics and molecular barrier properties. In: Langmuir. 2014 ; Vol. 30, No. 13. pp. 3687-3696.
@article{9750d9418ad14979a4979eda849a0e8a,
title = "Two-dimensional materials as emulsion stabilizers: Interfacial thermodynamics and molecular barrier properties",
abstract = "A new application for two-dimensional (2D) materials is emulsification, where they can serve as ultrathin platelike interfacial stabilizers in two-liquid systems. We present a first detailed thermodynamic analysis of atomically thin 2D materials at organic-aqueous liquid-liquid interfaces and derive expressions for the transfer free energies of emulsion stabilization that account for material geometry, van der Waals transparency or opacity, and variable hydrophobicity. High mass potency is shown to be an intrinsic property of the 2D geometry, which at the atomically thin limit places every atom in contact with both liquid phases, resulting in unit atom efficiency. The thermodynamic model successfully predicts that graphene oxide but not pristine graphene has a favorable hydrophobic-hydrophilic balance for oil-water emulsion stabilization. Multilayer tiling is predicted to occur by the passivation of droplet surface patches left uncovered by packing inefficiencies in the first monolayer, and complete multilayer coverage is confirmed by cryogenic scanning electron microscopy. The molecular barrier function of graphene interfacial films causes a significant suppression of dispersed-phase evaporation rates with potential applications in controlled release. Finally, these emulsions can be used as templates for creating solid graphene foams or graphene microsacks filled with lipophilic cargos. Emerging 2D materials are promising as dispersants or emulsifiers where high mass potency and multifunctional properties are desired.",
author = "Creighton, {Megan A.} and Yuzo Ohata and Jin Miyawaki and Arijit Bose and Hurt, {Robert H.}",
year = "2014",
month = "4",
day = "8",
doi = "10.1021/la500216n",
language = "English",
volume = "30",
pages = "3687--3696",
journal = "Langmuir",
issn = "0743-7463",
publisher = "American Chemical Society",
number = "13",

}

TY - JOUR

T1 - Two-dimensional materials as emulsion stabilizers

T2 - Interfacial thermodynamics and molecular barrier properties

AU - Creighton, Megan A.

AU - Ohata, Yuzo

AU - Miyawaki, Jin

AU - Bose, Arijit

AU - Hurt, Robert H.

PY - 2014/4/8

Y1 - 2014/4/8

N2 - A new application for two-dimensional (2D) materials is emulsification, where they can serve as ultrathin platelike interfacial stabilizers in two-liquid systems. We present a first detailed thermodynamic analysis of atomically thin 2D materials at organic-aqueous liquid-liquid interfaces and derive expressions for the transfer free energies of emulsion stabilization that account for material geometry, van der Waals transparency or opacity, and variable hydrophobicity. High mass potency is shown to be an intrinsic property of the 2D geometry, which at the atomically thin limit places every atom in contact with both liquid phases, resulting in unit atom efficiency. The thermodynamic model successfully predicts that graphene oxide but not pristine graphene has a favorable hydrophobic-hydrophilic balance for oil-water emulsion stabilization. Multilayer tiling is predicted to occur by the passivation of droplet surface patches left uncovered by packing inefficiencies in the first monolayer, and complete multilayer coverage is confirmed by cryogenic scanning electron microscopy. The molecular barrier function of graphene interfacial films causes a significant suppression of dispersed-phase evaporation rates with potential applications in controlled release. Finally, these emulsions can be used as templates for creating solid graphene foams or graphene microsacks filled with lipophilic cargos. Emerging 2D materials are promising as dispersants or emulsifiers where high mass potency and multifunctional properties are desired.

AB - A new application for two-dimensional (2D) materials is emulsification, where they can serve as ultrathin platelike interfacial stabilizers in two-liquid systems. We present a first detailed thermodynamic analysis of atomically thin 2D materials at organic-aqueous liquid-liquid interfaces and derive expressions for the transfer free energies of emulsion stabilization that account for material geometry, van der Waals transparency or opacity, and variable hydrophobicity. High mass potency is shown to be an intrinsic property of the 2D geometry, which at the atomically thin limit places every atom in contact with both liquid phases, resulting in unit atom efficiency. The thermodynamic model successfully predicts that graphene oxide but not pristine graphene has a favorable hydrophobic-hydrophilic balance for oil-water emulsion stabilization. Multilayer tiling is predicted to occur by the passivation of droplet surface patches left uncovered by packing inefficiencies in the first monolayer, and complete multilayer coverage is confirmed by cryogenic scanning electron microscopy. The molecular barrier function of graphene interfacial films causes a significant suppression of dispersed-phase evaporation rates with potential applications in controlled release. Finally, these emulsions can be used as templates for creating solid graphene foams or graphene microsacks filled with lipophilic cargos. Emerging 2D materials are promising as dispersants or emulsifiers where high mass potency and multifunctional properties are desired.

UR - http://www.scopus.com/inward/record.url?scp=84897988438&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84897988438&partnerID=8YFLogxK

U2 - 10.1021/la500216n

DO - 10.1021/la500216n

M3 - Article

AN - SCOPUS:84897988438

VL - 30

SP - 3687

EP - 3696

JO - Langmuir

JF - Langmuir

SN - 0743-7463

IS - 13

ER -