Forced motion of a probe particle near the colloidal glass transition

@article{citeulike:2730833, 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\_{{\rm g}}\$. For dense liquid-like samples near \$\phi\_{{\rm 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\_{{\rm 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.}, author = {Habdas}, citeulike-article-id = {2730833}, journal = {Europhys. Lett., 67 (3), p. 477 (2004)}, keywords = {colloids, glass, tracer, weeks}, posted-at = {2008-04-28 20:14:31}, priority = {2}, title = {Forced motion of a probe particle near the colloidal glass transition}, url = {http://www.iop.org/EJ/article/0295-5075/67/3/477/epl8272.html} }

TY - JOUR ID - citeulike:2730833 L3 - citeulike-article-id:2730833 TI - Forced motion of a probe particle near the colloidal glass transition JF - Europhys. Lett., 67 (3), p. 477 (2004) N2 - We use confocal microscopy to study the motion of a magnetic bead in a dense colloidal suspension, near the colloidal glass transition volume fraction $\phi_{{\rm g}}$. For dense liquid-like samples near $\phi_{{\rm g}}$, 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 $\phi_{{\rm g}}$ 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. KW - colloids KW - glass KW - tracer KW - weeks AU - Habdas UR - http://www.iop.org/EJ/article/0295-5075/67/3/477/epl8272.html ER -