Grain-boundary fluctuations in two-dimensional colloidal crystals.
Grain-boundary fluctuations in two-dimensional colloidal crystals.
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DOI：
10.1103/physrevlett.105.168301
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发表时间：
2010-10
影响因子：
8.6
通讯作者：
T. Skinner;D. Aarts;R. Dullens
中科院分区：
文献类型：
--
作者：
T. Skinner;D. Aarts;R. Dullens
我们用视频显微镜研究了二维胶体晶体在真实的时空中的晶界涨落。实验得到的静态和动态相关函数很好地描述了使用毛细管波理论得到的表达式。这直接导致的界面刚度和界面流动性，曲率驱动晶界迁移的关键参数的值。此外，我们还表明，平均晶界位置表现出一维随机游走，正如最近计算机模拟所建议的那样[Z. T.特劳特湾Upmanyu和A. Karma，Science 314，632（2006）]。从平均晶界位置的均方位移确定的界面迁移率是在很好的协议从晶界波动推断的值。
We study grain-boundary fluctuations in two-dimensional colloidal crystals in real space and time using video microscopy. The experimentally obtained static and dynamic correlation functions are very well described by expressions obtained using capillary wave theory. This directly leads to values for the interfacial stiffness and the interface mobility, the key parameters in curvature-driven grain-boundary migration. Furthermore, we show that the average grain-boundary position exhibits a one-dimensional random walk as recently suggested by computer simulations [Z. T. Trautt, M. Upmanyu, and A. Karma, Science 314, 632 (2006)]. The interface mobility determined from the mean-square displacement of the average grain-boundary position is in good agreement with values inferred from grain-boundary fluctuations.