Relaxation dynamics of colloidal particles at liquid interfaces | Zendy

Anna Wang | Zendy; David M. Kaz | Zendy; Ryan McGorty | Zendy; Vinothan Manoharan | Zendy

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Relaxation dynamics of colloidal particles at liquid interfaces

Author(s) -

Anna Wang,

David M. Kaz,

Ryan McGorty,

Vinothan Manoharan

Publication year - 2013

Publication title -

aip conference proceedings

Language(s) - English

Resource type - Conference proceedings

SCImago Journal Rank - 0.177

H-Index - 75

eISSN - 1551-7616

pISSN - 0094-243X

DOI - 10.1063/1.4794594

Subject(s) - relaxation (psychology) , chemical physics , millisecond , materials science , colloid , polystyrene , nanoparticle , dynamics (music) , molecular physics , nanotechnology , chemistry , polymer , composite material , physics , psychology , social psychology , astronomy , acoustics

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.

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