Dynamics of pattern coarsening in a two-dimensional smectic system
Dynamics of pattern coarsening in a two-dimensional smectic system
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DOI：
10.1103/physreve.66.011706
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发表时间：
2002-07-01
影响因子：
2.4
通讯作者：
Adamson, DH
中科院分区：
文献类型：
--
作者：
Harrison, C;Cheng, ZD;Adamson, DH
我们遵循的粗化动力学的单层圆柱形嵌段共聚物微区的薄膜。该系统具有二维近晶的对称性。用扫描电子显微镜测量了微区的取向相关长度，发现微区的取向相关长度以+/-1/2向错之间的平均间距增长，遵循类似于t（1/4）的幂律xi（2）（t）。通过跟踪退火过程中的向错与时间推移原子力显微镜，我们观察到占主导地位的机制，向错湮灭涉及三极和四极（三个和四个向错，分别）。我们描述了如何湮灭事件涉及多个向错导致类似的减少动力学指数在这里观察到的。这些结果映射到各种各样的物理系统，表现出类似的条纹图案。
We have followed the coarsening dynamics of a single layer of cylindrical block copolymer microdomains in a thin film. This system has the symmetry of a two-dimensional smectic. The orientational correlation length of the microdomains was measured by scanning electron microscopy and found to grow with the average spacing between +/-1/2 disclinations, following a power law xi(2)(t)similar tot(1/4). By tracking disclinations during annealing with time-lapse atomic force microscopy, we observe dominant mechanisms of disclination annihilation involving tripoles and quadrupoles (three and four disclinations, respectively). We describe how annihilation events involving multiple disclinations result in similarly reduced kinetic exponents as observed here. These results map onto a wide variety of physical systems that exhibit similarly striped patterns.