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Micromachines 2018, 9(5), 229; https://doi.org/10.3390/mi9050229

Electroosmotic Flow in Microchannel with Black Silicon Nanostructures

1
School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
2
Engineering Cluster, Singapore Institute of Technology, 10 Dover Drive, Singapore 138682, Singapore
3
Department of Micro- and Nanotechnology, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
*
Author to whom correspondence should be addressed.
Received: 2 April 2018 / Revised: 7 May 2018 / Accepted: 8 May 2018 / Published: 11 May 2018
(This article belongs to the Special Issue Micro/Nano-Chip Electrokinetics, Volume II)
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Abstract

Although electroosmotic flow (EOF) has been applied to drive fluid flow in microfluidic chips, some of the phenomena associated with it can adversely affect the performance of certain applications such as electrophoresis and ion preconcentration. To minimize the undesirable effects, EOF can be suppressed by polymer coatings or introduction of nanostructures. In this work, we presented a novel technique that employs the Dry Etching, Electroplating and Molding (DEEMO) process along with reactive ion etching (RIE), to fabricate microchannel with black silicon nanostructures (prolate hemispheroid-like structures). The effect of black silicon nanostructures on EOF was examined experimentally by current monitoring method, and numerically by finite element simulations. The experimental results showed that the EOF velocity was reduced by 13 ± 7%, which is reasonably close to the simulation results that predict a reduction of approximately 8%. EOF reduction is caused by the distortion of local electric field at the nanostructured surface. Numerical simulations show that the EOF velocity decreases with increasing nanostructure height or decreasing diameter. This reveals the potential of tuning the etching process parameters to generate nanostructures for better EOF suppression. The outcome of this investigation enhances the fundamental understanding of EOF behavior, with implications on the precise EOF control in devices utilizing nanostructured surfaces for chemical and biological analyses. View Full-Text
Keywords: micro-/nanofabrication; reactive ion etching; injection molding; electroosmotic flow; current monitoring method; finite element method micro-/nanofabrication; reactive ion etching; injection molding; electroosmotic flow; current monitoring method; finite element method
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Lim, A.E.; Lim, C.Y.; Lam, Y.C.; Taboryski, R. Electroosmotic Flow in Microchannel with Black Silicon Nanostructures. Micromachines 2018, 9, 229.

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