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Glasses in hard spheres with short-range attraction

by: KN Pham, SU Egelhaaf, PN Pusey, WCK Poon
Physical Review E, Vol. 69, No. 1. (28 January 2004), 011503.

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We report a detailed experimental study of the structure and dynamics of glassy states in hard spheres with short-range attraction. The system is a suspension of nearly hard-sphere colloidal particles and nonadsorbing linear polymer which induces a depletion attraction between the particles. Observation of crystallization reveals a reentrant glass transition. Static light scattering shows a continuous change in the static structure factors upon increasing attraction. Dynamic light scattering results; which cover 11 orders of magnitude in time; are consistent with the existence of two distinct kinds of glasses; those dominated by interparticle repulsion and caging; and those dominated by attraction. Samples close to the “ A 3 point” predicted by mode coupling theory for such systems show very slow; logarithmic dynamics.


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