Phys. Rev. Lett. 99, 025702 (2007) [4 pages]Colloidal Glass Transition Observed in Confinement
See accompanying Physics Focus We study a colloidal suspension confined between two quasiparallel walls as a model system for glass transitions in confined geometries. The suspension is a mixture of two particle sizes to prevent wall-induced crystallization. We use confocal microscopy to directly observe the motion of colloidal particles. This motion is slower in confinement, thus producing glassy behavior in a sample which is a liquid in an unconfined geometry. For higher volume fraction samples (closer to the glass transition), the onset of confinement effects occurs at larger length scales. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.025702
DOI:
10.1103/PhysRevLett.99.025702
PACS:
64.70.Pf, 61.43.Fs, 82.70.Dd
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