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Electrically Induced Morphological Instabilities in Free Dendrite Growth

Libbrecht, Kenneth G. and Tanusheva, Victoria M. (1998) Electrically Induced Morphological Instabilities in Free Dendrite Growth. Physical Review Letters, 81 (1). pp. 176-179. ISSN 0031-9007. doi:10.1103/PhysRevLett.81.176.

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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.

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Libbrecht, Kenneth G.0000-0002-8744-3298
Additional Information:©1998 The American Physical Society Received 2 March 1998 We acknowledge support for V.M.T. by Mr. and Mrs. Downie D. Muir III. See Also: Comment: Efim A. Brener and H. Müller-Krumbhaar, Comment on “Electrically Induced Morphological Instabilities in Free Dendrite Growth”, Phys. Rev. Lett. 83, 1698 (1999) Reply: K. G. Libbrecht and V. M. Tanusheva, Libbrecht and Tanusheva Reply:, Phys. Rev. Lett. 83, 1699 (1999) Focus Story: Phys. Rev. Focus 2, story 1
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