二维胶体硬球中的键取向序与弗兰克常数
Bond-orientational order and Frank's constant in two-dimensional colloidal hard spheres.
作者信息
Thorneywork Alice L, Abbott Joshua L, Aarts Dirk G A L, Keim Peter, Dullens Roel P A
机构信息
Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QZ, United Kingdom. Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom.
出版信息
J Phys Condens Matter. 2018 Mar 14;30(10):104003. doi: 10.1088/1361-648X/aaab31.
Recently, the full phase behaviour of 2D colloidal hard spheres was experimentally established, and found to involve a first order liquid to hexatic transition and a continuous hexatic to crystal transition (Thorneywork et al 2017 Phys. Rev. Lett. 118 158001). Here, we expand upon this work by considering the behaviour of the bond-orientational correlation time and Frank's constant in the region of these phase transitions. We also consider the excess entropy, as calculated from the radial distribution functions, for a wide range of area fractions covering the liquid, hexatic and crystal phases. In all cases, the behaviour of these quantities further corroborates the previously reported melting scenario of 2D colloidal hard spheres.
最近，二维胶体硬球的完整相行为已通过实验确定，并发现其涉及一级液相到六方相转变以及连续的六方相到晶体相转变（索恩沃克等人，《物理评论快报》，2017年，第118卷，第158001页）。在此，我们通过考虑这些相变区域内键取向关联时间和弗兰克常数的行为来扩展这项工作。我们还考虑了从径向分布函数计算得出的过剩熵，涵盖液相、六方相和晶体相的广泛面积分数范围。在所有情况下，这些量的行为进一步证实了先前报道的二维胶体硬球的熔化情况。
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