Hi all, I am making microchannels with PDMS for guiding flow. The liquid is driven by electroosmosis. Without the channel I can see the liquid moving using latex particles, while nothing could be seen with channels on. I reckon this is due to the high hydraulic resistance. Will it be better if PDMS is treated by O2 plasma and becomes hydrophilic? I will also increase the channel height. Will this also help? Cheers _______________________________________________ Hosted by the MEMS and Nanotechnology Exchange, the country's leading provider of MEMS and Nanotechnology design and fabrication services. Visit us at http://www.mems-exchange.org Want to advertise to this community? See http://www.memsnet.org To unsubscribe: http://mail.mems-exchange.org/mailman/listinfo/mems-talk