Cooperatively rearranging regions change shape near the mode-coupling crossover for colloidal liquids on a sphere

Singh, N and Sood, AK and Ganapathy, R (2020) Cooperatively rearranging regions change shape near the mode-coupling crossover for colloidal liquids on a sphere. In: Nature Communications, 11 (1).

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Abstract

The structure and dynamics of liquids on curved surfaces are often studied through the lens of frustration-based approaches to the glass transition. Competing glass transition theories, however, remain largely untested on such surfaces and moreover, studies hitherto have been entirely theoretical/numerical. Here we carry out single particle-resolved imaging of dynamics of bi-disperse colloidal liquids confined to the surface of a sphere. We find that mode-coupling theory well captures the slowing down of dynamics in the moderate to deeply supercooled regime. Strikingly, the morphology of cooperatively rearranging regions changed from string-like to compact near the mode-coupling crossover�a prediction unique to the random first-order theory of glasses. Further, we find that in the limit of strong curvature, Mermin�Wagner long-wavelength fluctuations are irrelevant and liquids on a sphere behave like three-dimensional liquids. A comparative evaluation of competing mechanisms is thus an essential step towards uncovering the true nature of the glass transition. © 2020, The Author(s).

Item Type:	Journal Article
Publication:	Nature Communications
Publisher:	Nature Research
Additional Information:	The copyright of this article belongs to Nature Research
Keywords:	colloid; comparative study; liquid; prediction; shape analysis; ultrastructure
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	15 Dec 2020 06:18
Last Modified:	15 Dec 2020 06:18
URI:	http://eprints.iisc.ac.in/id/eprint/67079

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