Title

Conformal Switchable Superhydrophobic/Hydrophilic Surfaces For Microscale Flow Control

Keywords

Hydrophilic; Hydrophobic; Microfluidic; Surfaces; Switchable

Abstract

The development of microvalves is essential to realize a fully integrated system for nano/microliter fluid handling in microfluidic devices. Microvalves that utilize passive fluidic manipulation employ a hydrophobic surface in a microchannel network in which the operation is controlled by the interfacial tension of the liquid-air-solid interface. In order to obtain a switchable valve in microfluidic channels, conformal hydrophobic/hydrophilic and superhydrophobic/hydrophilic thermal switchable surfaces were fabricated by the layer-by-layer deposition of poly(allylamine hydrochloride) (PAH) and silica nanoparticles followed by the functionalization of a thermosensitive polymer-poly(N-isopropylacrylamide) (PNIPAAm) and perfluorosilane. A fully integrated microfluidic valve using a thermal switchable superhydrophobic/hydrophilic polymer patch has been fabricated. At 70 °C, the valve is superhydrophobic and stops the water flow (closing status) while at room temperature, the patch becomes hydrophilic, and allows the flow (opening status).

Publication Date

2-5-2009

Publication Title

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Volume

333

Issue

1-3

Number of Pages

187-193

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.colsurfa.2008.09.044

Socpus ID

57149117115 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/57149117115

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