Exploiting the Marangoni Effect To Initiate Instabilities and Direct the Assembly of Liquid Metal Filaments
Exploiting the Marangoni Effect To Initiate Instabilities and Direct the Assembly of Liquid Metal Filaments
复制标题
DOI：
10.1021/acs.langmuir.7b01655
复制
发表时间：
2017-08-22
期刊：
影响因子：
3.9
通讯作者：
Rack, P. D.
中科院分区：
文献类型：
--
作者：
Hartnett, C. A.;Seric, I.;Rack, P. D.
研究了液态金属中Marangoni效应的应用，着重于通过瑞利平台不稳定性引发不稳定性来指导材料组装。用光刻技术在厚(12 Nm)镍(Ni)舰船上刻画了2 nm的铜薄膜，在瑞利平台不稳定性分析预测的灯丝不稳定性的最大波长处诱导了表面能量梯度。图案用18 ns的脉冲激光照射，图案熔化，由此产生的镍-铜表面张力梯度由于表面能的差异而诱导Marangoni流：由广泛的直接数值模拟支持的实验结果表明，Marangoni流超过由初始几何形状诱导的毛细管流，引导不稳定性，从而最终纳米粒子位置指向表面能较高的区域(镍区域)。我们的工作显示了一条通过Marangoni效应来控制表面不稳定性的演化和由此产生的图案形成的途径。
Utilization of the Marangoni effect in a liquid metal is investigated, focusing on initiating instabilities to direct material assembly via the Rayleigh Plateau instability. Thin (2 nm) copper (Cu) films are lithographically patterned onto thick (12 nm) nickel (Ni) Ships to induce a surface energy gradient at the maximum wavelength of the filament instability predicted by Rayleigh Plateau instability analysis. The pattern is irradiated with an 18 ns Pulsed laser such that, the pattern melts and the resultant Ni-Cu surface tension gradient induces Marangoni flows due to the difference in surface energies: The experiniental results, supported by extensive direct numerical simulations, demonstrate that the Marangoni flow exceeds, the capillary flow induced by the initial geometry, guiding instabilities such that final nanoparticle location is directed toward the regions of higher surface energy (Ni regions). Our work shows a route for manipulation, by means of the Marangoni effect, to direct the evolution of the surface instabilities and the resulting pattern formation.