We study glass formation in hard spheres with short-range attraction. The
system consists of nearly-hard-sphere polymethylmethacrylate particles and
non-adsorbing random-coil polystyrene which induced a depletion attraction
between the particles. The experiments reveal a re-entrant glass transition
and two qualitatively distinct glassy states. Dynamic light scattering, covering
eleven orders ofmagnitude in time, gives insight into the kinds of particle motion
responsible for these observations. The possible relevance of our results to
generic issues, such as the distinction between fragile and strong glass formers,
the nature of the underlying ‘free energy landscape’, and the relative importance
of temperature and pressure, is discussed
