Experimental determination of configurational entropy in a two-dimensional liquid under random pinning
Experimental determination of configurational entropy in a two-dimensional liquid under random pinning
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DOI：
10.1088/1361-648x/aaa869
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发表时间：
2018-03
期刊：
影响因子：
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通讯作者：
Ian Williams;F. Turci;J. Hallett;Peter Crowther;C. Cammarota;G. Biroli;-C.;Paddy Royall
中科院分区：
文献类型：
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作者：
Ian Williams;F. Turci;J. Hallett;Peter Crowther;C. Cammarota;G. Biroli;-C.;Paddy Royall
研究了准二维胶体悬浮液在随机分数颗粒的固定(钉扎)作用下的行为。我们引入了一种新的实验方法来进行随机钉扎，在数值模拟的支持下，我们发现增加钉扎浓度可以平稳地阻止系统，从高迁移率和高熵的区域过渡到低迁移率和低熵的区域。在局域水平上，我们研究了Pins的面积分数和浓度的涨落，并将它们映射到熵结构特征和局域迁移率，得到了实验系统的局域熵涨落的度量。
A quasi two-dimensional colloidal suspension is studied under the influence of immobilisation (pinning) of a random fraction of its particles. We introduce a novel experimental method to perform random pinning and, with the support of numerical simulation, we find that increasing the pinning concentration smoothly arrests the system, with a cross-over from a regime of high mobility and high entropy to a regime of low mobility and low entropy. At the local level, we study fluctuations in area fraction and concentration of pins and map them to entropic structural signatures and local mobility, obtaining a measure for the local entropic fluctuations of the experimental system.