Effective charges and zeta potentials of oil in water microemulsions in the presence of Hofmeister salts | Zendy

Alexandre P. dos Santos | Zendy; Yan Levin | Zendy

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Effective charges and zeta potentials of oil in water microemulsions in the presence of Hofmeister salts

Author(s) -

Alexandre P. dos Santos,

Yan Levin

Publication year - 2018

Publication title -

the journal of chemical physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.071

H-Index - 357

eISSN - 1089-7690

pISSN - 0021-9606

DOI - 10.1063/1.5019704

Subject(s) - chaotropic agent , microemulsion , chemistry , surface tension , zeta potential , hofmeister series , dispersion (optics) , poisson–boltzmann equation , ion , adsorption , thermodynamics , chemical physics , viscosity , surface charge , chemical engineering , chromatography , organic chemistry , pulmonary surfactant , nanotechnology , materials science , nanoparticle , physics , biochemistry , optics , engineering

We present a theory which allows us to calculate the effective charge and zeta potential of oil droplets in microemulsions containing Hofmeister salts. A modified Poisson-Boltzmann equation is used to account for the surface and ion polarizations and hydrophobic and dispersion interactions. The ions are classified as kosmotropes and chaotropes according to their Jones-Dole viscosity B coefficient. Kosmotropes stay hydrated and do not enter into the oil phase, while chaotropes can adsorb to the oil-water interface. The effective interaction potentials between ions and oil-water interface are parametrized so as to accurately account for the excess interfacial tension.

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