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Journal of Thin Films, Coating Science Technology & Application

Recording on Passive Capillary Flow of Dyed Working Liquids in the Polymer based Microfluidic Devices Fabricated inside the Cleanroom Laboratory

  1. Subhadeep Mukhopadhyay

Abstract

In this experimental work, author has fabricated total 13 individual microfluidic devices using the maskless lithography, hot embossing lithography, direct bonding technique, diamond like carbon (DLC) coating, and laboratory-made clamping inside the cleanroom laboratory using author’s own hands-on completely. Polymethylmethacrylate (PMMA) is the chosen polymer to fabricate the 10 individual microfluidic devices due to its plasticity and optical transparency. Dyed water, dyed ethylene glycol and dyed ethanol are the prepared working liquids in this work to record the passive capillary flows in the fabricated devices. A CMOS camera catching 25 frames per second with a corresponding resolution of 0.04 second is used to record each passive capillary flow. After recording, each passive capillary flow is observed to be leakage-free due to the proper sealing by direct bonding technique. Also, total 3 individual passive capillary flows of dyed working liquids are demonstrated corresponding to three individual SU-8 based glass microfluidic devices. This work may be useful in commercial bioengineering applications by control on working liquids inside the microfluidic lab-on-a-chip systems.

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