Molecular dynamics simulation of optically trapped colloidal particles at an oil-water interface

The Journal of Chemical Physics
Jizhong Sun, T Stirner

Abstract

Using molecular dynamics simulations, we calculate the net force on a colloidal particle trapped by an optical tweezer and confined within a particle monolayer which is in motion relative to the trapped particle. The calculations are compared with recent experimental data on polystyrene particles located at an oil-water interface. Good agreement between theory and experiment is obtained over the investigated range of lattice constants for an interaction mechanism between the polystyrene particles which is dominated by an effective dipole-dipole potential. The assumed interaction mechanism is consistent with the formation of surface charge dipoles at the particle-oil interface due to the dissociaton of the hydrophilic sulfate headgroups at the surface of the polystyrene particles. A possible physical mechanism for the formation of the surface charge dipoles, involving a diffuse cloud of fully hydrated counterions, is described, and the fraction of surface groups contributing to the formation of surface charge dipoles is estimated to be of the order of 10(-1) for the present system.

References

Mar 11, 1985·Physical Review Letters·A J Hurd, D W Schaefer
Aug 2, 1993·Physical Review Letters·D J Robinson, J C Earnshaw
May 26, 2001·Journal of Colloid and Interface Science·F. GhezziM. McCluney
Sep 15, 2001·Nature·A Pertsinidis, X S Ling
Mar 18, 2003·Faraday Discussions·Edward J StancikGerald G Fuller
Jun 6, 2003·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Jizhong Sun, T Stirner

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Citations

Jun 29, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·T Stirner, Jizhong Sun
Jul 15, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Julia FornleitnerChristos N Likos

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