Electrokinetic instability flow in nanofilm-coated microfluidic channels

Wei Chih Chen, Ting Fu Hong, Wen Bo Luo, Chang Hsien Tai, Chien Hsiung Tsai, Lung Ming Fu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper presented a parametric experimental study of electrokinetic instability phenomena in a cross-shaped configuration microfluidic device with varying channel depths and conductivity ratios. The flow instability is observed when applied electric field strength exceeds a certain critical value. The critical electric field strength is examined as a function of the conductivity ratio of two samples liquid, microchannel depth, and the treatment of microchannel wetted surface. It is found that the critical electric field strengths for the onset of electrokinetic instability are strongly dependent on the conductivity ratio of two samples liquid, and decrease as the channel depths increasing of microfluidic devices. In the present study, the surface inside microchannels is treated utilizing hydrophilic and hydrophobic organic-based SOG (spin-on-glass) nanofilms for glass-based microchips. The experimental results indicate that no significant difference for the critical electric fields for the onset of electrokinetic instability phenomena in both hydrophilic and hydrophobic SOG coating in the surface of microchannels. The critical electric fields for the onset of electrokinetic instability phenomena are slightly lower in both SOG coated cases in compare with that of the non-coated microchannel.

Original languageEnglish
Title of host publicationMicro and Nano Technology - 1st International Conference Society of Micro/Nano Technology, CSMNT
PublisherTrans Tech Publications
Pages330-333
Number of pages4
ISBN (Print)0878493395, 9780878493395
DOIs
Publication statusPublished - 2009 Jan 1
EventMicro and Nano Technology - 1st International Conference Society of Micro/Nano Technology, CSMNT - Beijing, China
Duration: 2008 Nov 192008 Nov 22

Publication series

NameAdvanced Materials Research
Volume60-61
ISSN (Print)1022-6680

Other

OtherMicro and Nano Technology - 1st International Conference Society of Micro/Nano Technology, CSMNT
CountryChina
CityBeijing
Period08-11-1908-11-22

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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  • Cite this

    Chen, W. C., Hong, T. F., Luo, W. B., Tai, C. H., Tsai, C. H., & Fu, L. M. (2009). Electrokinetic instability flow in nanofilm-coated microfluidic channels. In Micro and Nano Technology - 1st International Conference Society of Micro/Nano Technology, CSMNT (pp. 330-333). (Advanced Materials Research; Vol. 60-61). Trans Tech Publications. https://doi.org/10.4028/www.scientific.net/amr.60-61.330