Forced motion of a probe particle near the colloidal glass transition

Details Forced motion of a probe particle near the colloidal glass transition Forced motion of a probe particle near the colloidal glass transition

2003-08-29

arxiv.org/abs/cond-mat/0308622v2

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

Physics

Condensed Matter

Soft Condensed Matter

7 pages, 4 figures revised version, accepted for publication in Europhysics Letters

Scientific paper

10.1209/epl/i2004-10075-y

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

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