Electrically induced morphological instabilities in free dendrite growth

被引:51
作者
Libbrecht, KG [1 ]
Tanusheva, VM [1 ]
机构
[1] CALTECH 264 33, Norman Bridge Lab Phys, Pasadena, CA 91125 USA
关键词
D O I
10.1103/PhysRevLett.81.176
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We describe a new instability mechanism in free dendrite growth, which arises from electrically enhanced diffusion of polar molecules near the dendrite tip. For a small applied potential, the dendrite tip velocity increases slowly with potential, as is described by an extension of normal solvability theory. Above a threshold potential, however, capillarity is insufficient to stabilize growth. We present observations that confirm this instability, which brings about a transition from enhanced normal dendrite growth to a rapidly growing needle morphology with strongly suppressed sidebranching.
引用
收藏
页码:176 / 179
页数:4
相关论文
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