Dendritic growth of hard sphere crystals
Dendritic growth of hard sphere crystals
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DOI：
10.1021/la970062b
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发表时间：
1997-07-09
期刊：
影响因子：
3.9
通讯作者：
Rogers, R
中科院分区：
文献类型：
--
作者：
Russel, WB;Chaikin, PM;Rogers, R
最近对微重力下胶态硬球无序-有序转变的观察表明，在相图的共存区，样品中存在尺寸约为1-2 mm的树枝状微晶。数量级的估计合理地说明了在正常重力下不存在大的或树枝状的晶体及其在微重力下退火的稳定性。一个线性稳定性分析的阿克森和Schatzel模型的结晶硬球建立在小的过饱和度的扩散限制生长的不稳定域。硬球和分子晶体生长之间的关系的建立和利用相关的预测线性不稳定性观察到的发达的枝晶。
Recent observations of the disorder-order transition for colloidal hard spheres under microgravity revealed dendritic crystallites roughly 1-2 mm in size for samples in the coexistence region of the phase diagram. Order of magnitude estimates rationalize the absence of large or dendritic crystals under normal gravity and their stability to annealing in microgravity. A linear stability analysis of the Ackerson and Schatzel model for crystallization of hard spheres establishes the domain of instability for diffusion-limited growth at small supersaturations. The relationship between hard sphere and molecular crystal growth is established and exploited to relate the predicted linear instability to the well-developed dendrites observed.