Isolation of competing morphological patterns during microfluidic electrodeposition: Experimental confirmation of theory
Isolation of competing morphological patterns during microfluidic electrodeposition: Experimental confirmation of theory
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DOI：
10.1016/j.electacta.2021.139205
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发表时间：
2021-09
影响因子：
6.6
通讯作者：
Sarath Gopalakrishnan;A. Ganesh;Chun-Chieh Wang;Matthew Mango;Kirk J. Ziegler;R. Narayanan
中科院分区：
文献类型：
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作者：
Sarath Gopalakrishnan;A. Ganesh;Chun-Chieh Wang;Matthew Mango;Kirk J. Ziegler;R. Narayanan
界面处的小扰动可以在许多系统中导致定义明确的模式。然而，非线性相互作用掩盖了扩散限制系统的不稳定模式中的主波长，这限制了对这些系统的研究。提出了一种减轻非线性效应的微流控单元的设计，使增强的扩散效应和准一维电沉积图案的阴极上。这些微流体单元在小的过电位下工作，能够在电沉积过程中分离出形态图案。一个自动化的图像分析程序的开发转换成高度轮廓的不稳定性模式，并客观地提取组成的模式的波长。虽然在图案中观察到多个波长，包括谐波，但是在整个光谱中应用定制的定向滤波器以识别噪声并从图案中选择主波长。几乎所有实验的主波长都在理论波长的5%以内，三分之二在1%以内。
Small disturbances at an interface can lead to well-defined patterns in many systems. However, nonlinear interactions obscure the dominant wavelength in the instability pattern of diffusion-limited systems, which has limited the study of these systems. The design of a microfluidic cell that mitigates nonlinear effects is presented, enabling enhanced diffusional effects and quasi-1D electrodeposition of patterns on the cathode. These microfluidic cells, operating at small overpotentials, were able to isolate morphological patterns during electrodeposition. An automated image analysis routine is developed to convert the instability pattern into a height profile and objectively extract the wavelengths composing the pattern. Although multiple wavelengths, including harmonics, were observed in the pattern, a custom, directed filter was applied across the spectrum to identify noise and select the dominant wavelength from the pattern. The dominant wavelength of nearly all experiments were within 5% of the theoretical wavelength and two-thirds were within 1%.