Spontaneous emulsification by ionic surfactants and responsive nanoparticles, and theoretical models of inhomogeneous, correlated Coulomb fluids

Condensed Matter lunchtime seminar

Spontaneous emulsification by ionic surfactants and responsive nanoparticles, and theoretical models of inhomogeneous, correlated Coulomb fluids

  • Event time: 1:00pm
  • Event date: 17th May 2012
  • Speaker: Jos Zwanikken (Northwestern University)
  • Location: Room 2511,

Event details

We identify a new mechanism for the spontaneous formation of an oil-in-water emulsion [1]. Our classical density functional, which describes electrostatics, ionic surface reactions, and nanoparticle adsorption, predicts kinetically and even thermodynamically stable emulsion droplets with a tunable mesoscopic size. Our results closely match recent experiments [2][3], and may open new pathways for the reversible dispersion of particle-coated droplets that are desired in the fields of catalysis, controlled drug delivery and particle synthesis.

The last part of the presentation will highlight the structural and thermodynamic properties of electrolytes of the primitive model, at low temperatures, and near (dielectric) boundaries, as predicted by both classical and recently developed theories [4].

[1] JZ, K. Ioannidou, D. Kraft, and R. van Roij, Soft Matter 7, 11093 (2011). [2] S. Sacanna et al., Phys. Rev. Lett., (2007), 98, 158301. [3] D. Kraft et al., J. Phys. Chem. B, (2010), 114, 10347. [4] JZ, P. K. Jha, and M. Olvera de la Cruz, J. Chem. Phys. 135, 064106 (2011).

This is a weekly series of informal talks given primarily by members of the soft condensed matter and statistical mechanics groups, but is also open to members of other groups and external visitors. The aim of the series is to promote discussion and learning of various topics at a level suitable to the broad background of the group. Everyone is welcome to attend..

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