Efficient microfluid mixing is an important process for various microfluidic-based biological and chemical reactions. Herein we propose an efficient micromixer actuated by induced-charge electroosmosis (ICEO). The microchannel of this device is easy to fabricate for its simple straight channel structure. Importantly, unlike previous design featuring complicated three-dimensional conducting posts, we utilize the simpler asymmetrical planar floating-electrodes to induce asymmetrical microvortices. For evaluating the mixing performance of this micromixer, we conducted a series of simulations and experiments. The mixing performance was quantified using the mixing index, specifically, the mixing efficiency can reach 94.7% at a flow rate of 1500 µm/s under a sinusoidal wave with a peak voltage of 14 V and a frequency of 400 Hz. Finally, we compared this micromixer with different micromixing devices using a comparative mixing index, demonstrating that this micromixer remains competitive among these existing designs. Therefore, the method proposed herein can offer a simple solution for efficient fluids mixing in microfluidic systems.
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This work was financially supported by the National Natural Science Foundation of China (Grant no. 11672095, no. 11702035 and no. 11702075), the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (Grant no. 51521003), and the Opening fund of State Key Laboratory of Nonlinear Mechanics. We are also grateful to Haizhen Sun, Mingyu Xiao, Yupan Wu and Weiyu Liu for their assistance in the simulation and helpful results discussions.
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This article is part of the topical collection “2018 International Conference of Microfluidics, Nanofluidics and Lab-on-a-Chip, Beijing, China” guest edited by Guoqing Hu, Ting Si and Zhaomiao Liu.
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Zhang, K., Ren, Y., Hou, L. et al. An efficient micromixer actuated by induced-charge electroosmosis using asymmetrical floating electrodes. Microfluid Nanofluid 22, 130 (2018) doi:10.1007/s10404-018-2153-2
- Induced-charge electroosmosis
- Asymmetrical floating-electrodes
- Asymmetrical microvortices
- Comparative mixing index