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Joint CCS & Biophysics/Condensed Matter Seminar
Friday - February 25, 2011
12:00 noon
Physics Research Building - Room 595
3 Cummington Street
Dr. Kipton Barros (Former Aces Trainee)
CNLS Postdoctoral Research Associate
Los Alamos National Laboratory - New Mexico

"Dielectric effects in self-assembly of binary colloid mixtures "

Electrostatic interactions are often relevant to the self-assembly of colloids. In such systems, dielectric effects yield complicated multi-body interactions via polarization charge induced at the colloid surfaces. These interactions are difficult to quantify and have been ignored in previous simulations of colloids with implicit solvent. I will review the physics of dielectrics and present an efficient numerical method to calculate electrostatic interactions in arbitrary dielectric geometry. Surprising collective behavior is observed in molecular dynamics simulations of weakly charged, size asymmetric colloid mixtures: dielectric effects are found to influence crystallization and symmetry.



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