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첨단연성물질 연구단
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Anatomy of cage formation in a two-dimensional glass-forming liquid

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Title
Anatomy of cage formation in a two-dimensional glass-forming liquid
Author(s)
Bo, Li; Lou, Kai; Walter Kob; Steve , Granick
Publication Date
2020-11
Journal
Nature, v.587, no.7833, pp.225 - 229
Publisher
Nature Publishing Group
Abstract
As a glass-forming liquid is cooled, the dynamics of its constituent particles changes from being liquid-like to more solid-like. The solidity of the resulting glassy material is believed to be due to a cage-formation process, whereby the motion of individual particles is increasingly constrained by neighbouring particles. This process begins at the temperature (or particle density) at which the glass-forming liquid first shows signs of glassy dynamics; however, the details of how the cages form remain unclear1–4. Here we study cage formation at the particle level in a two-dimensional colloidal suspension (a glass-forming liquid). We use focused lasers to perturb the suspension at the particle level and monitor the nonlinear dynamic response of the system using video microscopy. All observables that we consider respond non-monotonically as a function of the particle density, peaking at the density at which glassy dynamics is first observed. We identify this maximum response as being due to cage formation, quantified by the appearance of domains in which particles move in a cooperative manner. As the particle density increases further, these local domains become increasingly rigid and dominate the macroscale particle dynamics. This microscale rheological deformation approach demonstrates that cage formation in glass-forming liquids is directly related to the merging of such domains, and reveals the first step in the transformation of liquids to glassy materials1,5.
URI
https://pr.ibs.re.kr/handle/8788114/12100
DOI
10.1038/s41586-020-2869-5
ISSN
0028-0836
Appears in Collections:
Center for Soft and Living Matter(첨단연성물질 연구단) > 1. Journal Papers (저널논문)
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