One-, Two-, and Three-Dimensional Hopping Dynamics
One-, Two-, and Three-Dimensional Hopping Dynamics
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DOI：
10.3390/cryst3020315
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发表时间：
2013-04
期刊：
影响因子：
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通讯作者：
K. M. Aoki;Susumu Fujiwara;K. Sogo;S. Ohnishi;Takenori Yamamoto
中科院分区：
文献类型：
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作者：
K. M. Aoki;Susumu Fujiwara;K. Sogo;S. Ohnishi;Takenori Yamamoto
玻璃中的跳跃动力学很早以前就为人所知。相比之下，在smic - a （SmA）和HexB （HexB）液晶（LC）中，跳变动力学是最近才观察到的。SmA相的跳变发生在近晶层之间（一维），而HexB相的跳变发生在层内（二维）。用平行软核球筒研究了SmA和HexB液晶相的跳变动力学，用Weeks-Chandler-Andersen （WCA）球体系研究了固有玻璃态的三维跳变动力学。SmA相中跳变扩散系数的温度依赖性可以用活化过程特征的Arrhenius方程来描述。在HexB LC相中，扩散系数在较高温度下达到饱和。在WCA球系统中，扩散系数的值和温度依赖关系取决于观测状态。
Hopping dynamics in glass has been known for quite a long time. In contrast, hopping dynamics in smectic-A (SmA) and hexatic smectic-B (HexB) liquid crystals (LC) has been observed only recently. The hopping in SmA phase occurs among the smectic layers (one-dimensionally), while hopping in HexB phase occurs inside the layers (two-dimensionally). The hopping dynamics in SmA and HexB liquid crystal phases is investigated by parallel soft-core spherocylinders, while three-dimensional hopping dynamics in inherent glassy states is investigated by systems of Weeks–Chandler–Andersen (WCA) spheres. The temperature dependence of diffusion coefficients of hopping in SmA phase can be described by the Arrhenius equation characteristic of activation process. In HexB LC phase, the diffusion coefficients saturate at higher temperatures. In a system of WCA spheres, the values and temperature dependence of diffusion coefficients depend on the observed states.