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- W2086753313 abstract "PDMS is a widely used material for construction of microfluidic devices. The traditional PDMS microfabrication process, although versatile, cannot be used to form microfluidic devices with embedded tall topological features, such as thick-film electrodes and porous reactor beds. This paper presents an elegant surface micromachining process for microfluidic devices that allows complete leak-proof sealing and a conformal contact of the PDMS with tall pre-existing topographical features and demonstrates this approach by embedding 6 ?m thick Ag/AgCl (high capacity 1680 ?A s) electrodes inside the microchannels. In this process, thin spin-cast films of the PDMS are used as the structural material and a photoresist is used as the sacrificial material. A crucial parameter, namely adhesion of the spun-cast structural layer to the substrate, was characterized for different pre-polymer ratios using a standard tensile test, and a 1:3 (curing agent:base) combination was found to be the best with a maximum adhesion strength of 7.2 MPa. The elastic property of the PDMS allowed extremely fast release times of ~1 min of the fabricated microchannels. The versatility of this process was demonstrated by the fabrication of a pneumatic microvalve with multi-layered microchannel geometry. The valve closure occurred at 6.37 kPa." @default.
- W2086753313 created "2016-06-24" @default.
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- W2086753313 date "2008-11-28" @default.
- W2086753313 modified "2023-09-24" @default.
- W2086753313 title "Surface micromachined PDMS microfluidic devices fabricated using a sacrificial photoresist" @default.
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- W2086753313 doi "https://doi.org/10.1088/0960-1317/19/1/015013" @default.
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