Forced motion of a probe particle near the colloidal glass transition

P. Habdas; D. Schaar; A. C. Levitt; E. R. Weeks

doi:10.1209/epl/i2004-10075-y

All issues

Volume 67 / No 3 (August 2004)

Europhys. Lett., 67 3 (2004) 477-483

Abstract

Issue		Europhys. Lett. Volume 67, Number 3, August 2004


Page(s)		477 - 483
Section		Interdisciplinary physics and related areas of science and technology
DOI		https://doi.org/10.1209/epl/i2004-10075-y
Published online		01 July 2004

Europhys. Lett., 67 (3), pp. 477-483 (2004)

Forced motion of a probe particle near the colloidal glass transition

P. Habdas, D. Schaar, A. C. Levitt and E. R. Weeks

Physics Department, Emory University - Atlanta, GA 30322, USA

Received: 22 January 2004
Accepted: 19 May 2004

Abstract

We use confocal microscopy to study the motion of a magnetic bead in a dense colloidal suspension, near the colloidal glass transition volume fraction $\phi_{\ab{g}}$ . For dense liquid-like samples near $\phi_{\ab{g}}$ , 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 $\phi_{\ab{g}}$ 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

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