Volume 67, Number 3, August 2004
|Page(s)||477 - 483|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 July 2004|
Forced motion of a probe particle near the colloidal glass transition
Physics Department, Emory University - Atlanta, GA 30322, USA
Accepted: 19 May 2004
We use confocal microscopy to study the motion of a magnetic bead in a dense colloidal suspension, near the colloidal glass transition volume fraction . For dense liquid-like samples near , below a threshold force the magnetic bead exhibits only localized caged motion. Above this force, the bead is pulled with a fluctuating velocity. The relationship between force and velocity becomes increasingly nonlinear as is approached. The threshold force and nonlinear drag force vary strongly with the volume fraction, while the velocity fluctuations do not change near the transition.
PACS: 82.70.Dd – Colloids / 64.70.Pf – Glass transitions / 61.43.Fs – Glasses
© EDP Sciences, 2004
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