Volume 84, Number 2, October 2008
|Number of page(s)||6|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||07 October 2008|
Short-time self-diffusion of weakly charged silica spheres at aqueous interfaces
Department of Physics, Hong Kong University of Science and Technology - Clear Water Bay, Kowloon, Hong Kong
Corresponding author: email@example.com
Accepted: 9 September 2008
Optical microscopy and multi-particle tracking are used to study the short-time self-diffusion of weakly charged silica spheres at a water-air interface. The measured short-time self-diffusion coefficient DSS has the form, DSS/D0=α (1-β n), where n is the area fraction occupied by the particles and D0 is the Stokes-Einstein diffusion coefficient of individual particles in the bulk fluid. The obtained values of α and differ from those obtained for bulk suspensions, indicating that hydrodynamic interactions between the interfacial particles have interesting new features when compared with their three-dimensional counterpart.
PACS: 82.70.Dd – Colloids / 68.05.Gh – Interfacial properties of microemulsions / 05.40.-a – Fluctuation phenomena, random processes, noise, and Brownian motion
© EPLA, 2008
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