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Issue 7, 2014
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Anisotropic Janus Si nanopillar arrays as a microfluidic one-way valve for gas–liquid separation

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Abstract

In this paper, we demonstrate a facile strategy for the fabrication of a one-way valve for microfluidic (MF) systems. The micro-valve was fabricated by embedding arrays of Janus Si elliptical pillars (Si-EPAs) with anisotropic wettability into a MF channel fabricated in poly(dimethylsiloxane) (PDMS). Two sides of the Janus pillar are functionalized with molecules with distinct surface energies. The ability of the Janus pillar array to act as a valve was proved by investigating the flow behaviour of water in a T-shaped microchannel at different flow rates and pressures. In addition, the one-way valve was used to achieve gas–liquid separation. We believe that the Janus Si-EPAs modified by specific surface functionalization provide a new strategy to control the flow and motion of fluids in MF channels.

Graphical abstract: Anisotropic Janus Si nanopillar arrays as a microfluidic one-way valve for gas–liquid separation

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Article information


Submitted
04 Nov 2013
Accepted
18 Jan 2014
First published
27 Jan 2014

Nanoscale, 2014,6, 3846-3853
Article type
Paper
Author version available

Anisotropic Janus Si nanopillar arrays as a microfluidic one-way valve for gas–liquid separation

T. Wang, H. Chen, K. Liu, Y. Li, P. Xue, Y. Yu, S. Wang, J. Zhang, E. Kumacheva and B. Yang, Nanoscale, 2014, 6, 3846
DOI: 10.1039/C3NR05865D

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