Cristin-resultat-ID: 1745388
Sist endret: 12. februar 2020, 08:48
NVI-rapporteringsår: 2019
Resultat
Vitenskapelig artikkel
2019

Electrocoalescence of water in oil emulsions: a DPD simulation study and a novel application of electroporation theory

Bidragsytere:
  • Roar Skartlien
  • Sebastien Charles Simon og
  • Johan Sjøblom

Tidsskrift

RSC Advances
ISSN 2046-2069
e-ISSN 2046-2069
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2019
Volum: 9
Hefte: 59
Sider: 34172 - 34183
Open Access

Importkilder

Scopus-ID: 2-s2.0-85074555621

Beskrivelse Beskrivelse

Tittel

Electrocoalescence of water in oil emulsions: a DPD simulation study and a novel application of electroporation theory

Sammendrag

Pore formation in a surfactant laden oil film between two aqueous electrolyte layers in a DC field was studied using DPD (Dissipative Particle Dynamics molecular simulation). This setting represents the final stage of an electro-coalescence process between water droplets in oil, where the oil film has drained out to nanometer thickness. We introduce a novel model for the coalescence probability based on electroporation theory for lipid bilayers, and an equation for a threshold electric potential above which coalescence is highly probable. Excess electric forcing (pinching) of the oil film occurred locally due to charge density fluctuations in the electrolyte, and this could lead to the formation of unstable, expanding pores and coalescence between the aqueous domains. Such unstable pores can form at lower electric potentials when the cohesive energy in the surfactant layer (primarily line tension) is lowered by adding demulsifier, or when demulsifier causes a morphology change in the surfactant layers with local areas that have lower surfactant density. In conclusion, higher ion concentrations in the electrolyte, higher electric field strength, and lower cohesive energy in the surfactant layer increased the coalescence probability.

Bidragsytere

Roar Skartlien

  • Tilknyttet:
    Forfatter
    ved Institutt for kjemisk prosessteknologi ved Norges teknisk-naturvitenskapelige universitet
  • Tilknyttet:
    Forfatter
    ved Strømningsteknikk ved Institutt for energiteknikk

Sebastien Charles Simon

  • Tilknyttet:
    Forfatter
    ved Institutt for kjemisk prosessteknologi ved Norges teknisk-naturvitenskapelige universitet

Johan Sjøblom

  • Tilknyttet:
    Forfatter
    ved Institutt for kjemisk prosessteknologi ved Norges teknisk-naturvitenskapelige universitet
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