Detachment of nanowires driven by capillarity

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• 作者：Fei Wang ; ^{fei.wang@hs-karlsruhe.de" class="auth_mail" title="E-mail the corresponding author} ; Britta Nestler ^{britta.nestler@kit.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Nanowire ; Detachment ; Capillarity ; Plateau&ndash ; Rayleigh instability ; Surface diffusion
• 刊名：Scripta Materialia
• 出版年：2016
• 出版时间：1 March 2016
• 年：2016
• 卷：113
• 期：Complete
• 页码：167-170
• 全文大小：568 K

文摘

The spontaneous breakup of nanowires into nanospheres is of crucial significance preventing it from applications. In the present work, we propose a generalized stability criterion for nanowires, in contrast to the convectional Rayleigh stability theory that has been widely employed to understand the breakup-mechanism of nanowires. We demonstrate that the minimum instability wavelength is ${\lambda }_{\text{critical}}=2\pi \sqrt{R_0^2-a^2}$ in contradiction to the convectional Rayleigh condition λ_critical = 2πR₀, where R₀ and a are the radius of the nanowire and the amplitude of the perturbation, respectively. The modified theory is confirmed by the dynamic phase-field simulations of different nanowire shapes.