Journal article
Two-Dimensional Materials as Emulsion Stabilizers: Interfacial Thermodynamics and Molecular Barrier Properties
Langmuir, v 30(13), pp 3687-3696
08 Apr 2014
PMID: 24625132
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 1 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. Multi layer 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.
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Details
- Title
- Two-Dimensional Materials as Emulsion Stabilizers: Interfacial Thermodynamics and Molecular Barrier Properties
- Creators
- Megan A. Creighton - Brown UniversityYuzo Ohata - Kyushu UniversityJin Miyawaki - Kyushu UniversityArijit Bose - University of Rhode IslandRobert H. Hurt - Brown University
- Publication Details
- Langmuir, v 30(13), pp 3687-3696
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 10
- Grant note
- Gulf of Mexico Research Initiative, a Department of Education GAANN fellowship G-COE program (New Carbon Materials) of Kyushu University
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:000334572100006
- Scopus ID
- 2-s2.0-84897988438
- Other Identifier
- 991021229983304721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Multidisciplinary
- Chemistry, Physical
- Materials Science, Multidisciplinary