This paper describes the optimization of bidirectional micropump velocity by a deposition of hydrophobic nanoparticle (NP) monolayer. A nano-composite polymer coating contains a homogeneous mixture of Silicon NP in polydimithylsiloxane (PDMS) which will modify the micropump surface to a hydrophobic surface. For hydrophobic nature of PDMS, the monolayer coating will modify the hydrophilic surface of biased AC electroosmotic micropump to a hydrophobic surface. Based on the results obtained from our previous research work for the biased AC electroosmotic micropump, the pumping velocity was 300 micron/sec in 100μm channel thickness for applied voltage of 4.4V at 1 KHz frequency [1]. In that research, we had optimized the applied AC voltage, frequency, channel dimension, and electrode width. The main objective of this research is to investigate the micropump velocity through a surface modification process. Adding a thin monolayer will separate the electrode from the pumping liquid; thus eliminating the reaction on the electrode for applied voltage. In such case, we can apply high voltage to achieve high pumping rate.

This content is only available via PDF.
You do not currently have access to this content.