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Sample Concentration by Asymmetry EOF flow in Micro/Nano Channels with O2/H2O Plasma Treated Channel Surfaces

R-Q Wu, F-G Tseng, C-S Yang and C-C Cheing
National Tsing Hua University, TW

Keywords:
asymmetry electroosmotic flow, sample concentration, plasma treatment, nano channel

Abstract:
In this study, we propose a new technique to concentrate sample effectively, which employs different surface treatment on the top and bottom of micro/nano channels. This treatment carries out different zeta-potentials on the opposite walls of micro/nano channels for generating asymmetry EOF flow to concentrate samples into one side of the channel. By employing this technique combined with nanochannel, the sample concentration and diffusion length for the sample to the electrochemistry detection site is greatly reduced, and near one order of magnitude signal enhancement has been achieved in this study.

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