Temperature-dependent structural arrest of silica colloids in a water–lutidine binary mixture

Xinhui Lu; S. G. J. Mochrie; S. Narayanan; A. R. Sandy; M. Sprung

doi:10.1039/C0SM00152J

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Soft Matter

Issue 24, 2010

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Temperature-dependent structural arrest of silica colloids in a water–lutidine binary mixture

Xinhui Lu,*^a S. G. J. Mochrie,^a^b S. Narayanan,^c A. R. Sandy^c and M. Sprung^c

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Department of Physics, Yale University, New Haven, USA
E-mail: xlu@bnl.gov

Department of Applied Physics, Yale University, New Haven, USA

Advanced Photon Source, Argonne National Laboratory, Argonne, USA

Soft Matter, 2010,6, 6160-6177

DOI: 10.1039/C0SM00152J
Received 24 Mar 2010, Accepted 30 Jun 2010
First published online 14 Sep 2010

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We study the onset of structural arrest and glass formation in a suspension of silica nanoparticles in a water–lutidine binary mixture near its consolute point. By exploiting the near-critical fluid degrees of freedom to control the strength of an attraction between particles and multispeckle X-ray photon correlation spectroscopy to characterize the particles' collective dynamics, we show that this model liquid undergoes a glass transition both on cooling and on heating, and that the intermediate liquid realizes unusual logarithmic relaxations. We are able to characterize in unprecedented detail how vitrification occurs for the two different glass transitions observed, and draw comparisons to recent theoretical predictions for glass formation in systems with attractive interactions.

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