首页|The cooperative migration dynamics of particles correlates to the nature of hexatic-isotropic phase transition in 2D systems of corner-rounded hexagons

The cooperative migration dynamics of particles correlates to the nature of hexatic-isotropic phase transition in 2D systems of corner-rounded hexagons

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In the two-dimensional(2D)melting transition of colloidal systems,the hexatic-isotropic(H-I)transition can be either first-order or continuous.However,how particle dynamics differs at the single-particle level during these two different melting transitions remains to be disclosed.In this work,by Brownian dynamics(BD)simulations,we have systematically studied the dynamic behavior of corner-rounded hexagons during the H-I transition,for a range of corner-roundness ζ=0.40 to 0.99 that covers the crossover from the continuous to first-order nature of H-I transition.The results show that hexagons with ζ ≤ 0.5 display a continuous H-I transition,whereas those with ζ ≥ 0.6 demonstrate a first-order H-I transition.Dynamic analysis shows different evolution pathways of the dominant cluster formed by migrating particles,which results in a droplet-like cluster structure for ζ=0.40 hexagons and a tree-like cluster structure for ζ=0.99 hexagons.Further investigations on the hopping activities of particles suggest a cooperative origin of migrating clusters.Our work provides a new aspect to understand the dependence of the nature of H-I transition on the roundness of hexagons through particle dynamic behavior.

Melting transitionColloidsHexatic phaseCooperative migrationHexagons

Zhanglin Hou、Mingwei Liu、Yiwu Zong、Fangfu Ye、Kun Zhao

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Wenzhou Institute,University of Chinese Academy of Sciences,Wenzhou,Zhejiang 325001,China

Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering(Ministry of Education),School of Chemical Engineering and Technology,Tianjin 300072,China

School of Physical Science,University of Chinese Academy of Sciences,Beijing 100049,China

Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China

Oujiang Laboratory(Zhejiang Lab for Regenerative Medicine,Vision and Brain Health),Wenzhou,Zhejiang 325001,China

Sichuan Provincial People's Hospital,University of Electronic Science and Technology of China,Chengdu,Sichuan 610054,China

Institute of Fundamental and Frontier Sciences,University of Electronic Science and Technology of China,Chengdu,Sichuan 610054,China

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国家自然科学基金国家自然科学基金国家自然科学基金中国科学院战略规划重点项目

118742772162100412104453XDB33030300

2024

10.1016/j.fmre.2022.09.012

自然科学基础研究(英文)

自然科学基础研究(英文)

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ISSN：
年,卷(期)：2024.(2)
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