@proceedings {252421,
	title = {Relaxation dynamics of colloidal particles at liquid interfaces},
	journal = {AIP Conference Proceedings},
	volume = {1518},
	year = {2013},
	note = { Presented at 4th International Symposium on Slow Dynamics in Complex Systems in Sendai, Japan
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	pages = {336-343},
	publisher = {American Institute of Physics},
	address = {Sendai, Japan},
	abstract = {We study the dynamics of colloidal particles as they approach and breach a water-oil interface. We use a fast 3D imaging technique, digital holographic microscopy, to track particles with 2 nm precision and sub-millisecond time resolution. We find that polystyrene particles dispersed in water or water-glycerol mixtures relax logarithmically with time after breaching the interface and do not reach equilibrium on experimental timescales. By contrast, decane-dispersed PMMA particles show fast dynamics and reach a steady-state height within milliseconds. We attribute the difference to the surface properties of the particles. We also probe the dependence of the relaxation rate on surface charge by studying carboxyl-functionalized particles under varying acid concentrations. We conclude that the slow relaxation may be due to contact-line pinning on topographical defects rather than surface charges.},
	url = {http://dx.doi.org/10.1063/1.4794594},
	author = {Wang, Anna and Kaz, David M and McGorty, Ryan and Vinothan N. Manoharan}
}
