Passive Capillary Flow of Aqueous Microparticle Suspensions in the Straight Microchannels fabricated by the Negative Photoresist SU-8

Abstract

A group of microfluidic devices are fabricated by the SU-8 negative photoresist using the standard SU-8 processing techniques. The influences of effective viscosity, channel aspect ratio and surface wettability on the surface-driven capillary flow of aqueous microparticle suspensions are individually studied in straight microchannels. Nano-films of diamond like carbon (DLC) are used to vary the surface wettability on SU-8 based microchannel structures. The number densities of suspended polystyrene microparticles in the three individually prepared suspensions are 1×105 particles mL-1, 1×106 particles mL-1 and 1×107 particles mL-1. In this study, dyed water is used as control liquid. This experimental study may be useful to control working liquids in the microfluidic lab-on-a-chip systems.

Cite this Article
Subhadeep Mukhopadhyay. Passive Capillary Flow of Aqueous Microparticle
Suspensions in the Straight Microchannels fabricated by the Negative Photoresist SU-8. Journal of Modern Chemistry & Chemical Technology. 2017; 8(3): 37–39p.