Microfluidic devices using thiol-ene polymers

Simon J. M. C. Bou; Amanda V. Ellis

doi:10.1117/12.2032608

7 December 2013 Microfluidic devices using thiol-ene polymers

Simon J. M. C. Bou, Amanda V. Ellis

Proceedings Volume 8923, Micro/Nano Materials, Devices, and Systems; 89232B (2013) https://doi.org/10.1117/12.2032608
Event: SPIE Micro+Nano Materials, Devices, and Applications, 2013, Melbourne, Victoria, Australia

Abstract

Here, a new polymeric microfluidic platform using off-stoichiometric thiol-ene (OSTE) polymers was developed. Thiolene polymers were chosen as they afford rapid UV curing, low volume shrinkage and optical transparency for use in microfluidic devices. Three different off-stoichiometric thiol-ene polymers with 30% excess allyl, 50% excess thiol and a 90% excess thiol (OSTE Allyl-30, OSTE-50 and OSTE-90, respectively) were fabricated. Attenuated reflectance Fourier transform infrared (ATR-FTIR) spectroscopy and solid-state cross polarisation-magic angle spinning (CP-MAS) nuclear magnetic resonance (NMR) spectroscopy confirmed which functional groups (thiol or allyl) were present in excess in the OSTE polymers. The polymers were shown to have a more hydrophilic surface (water contact angle of 65°± 3) compared to polydimethylsiloxane (water contact angle of 105° ± 5). Testing of the mechanical properties showed the glass transition temperatures to be 15.09 °C, 43.15 °C and, 57.48 °C for OSTE-90, OSTE Allyl-30 and, OSTE-50, respectively. The storage modulus was shown to be less than 10 MPa for the OSTE-90 polymer and approximately 1750 MPa for the OSTE Allyl-30 and OSTE-50 polymers. The polymers were then utilised to fabricate microfluidic devices via soft lithography practices and devices sealed using a one-step UV lamination “click” reaction technique. Finally, gold nanoparticles were used to form gold films on the OSTE-90 and OSTE-50 polymers as potential electrodes. Atomic force microscopy and sheet resistances were used to characterise the films.

Citation Download Citation

Simon J. M. C. Bou and Amanda V. Ellis "Microfluidic devices using thiol-ene polymers", Proc. SPIE 8923, Micro/Nano Materials, Devices, and Systems, 89232B (7 December 2013); https://doi.org/10.1117/12.2032608

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