Microfluidic concentration is achieved by utilizing Joule heating effect induced temperature gradient focusing (TGF) under a combined AC and DC electric field imposed in a straight microchannel with sudden expansion in cross-section. The introduction of AC electric field component services dual functions: one is to produce Joule heating effects for generating temperature gradient, and the other is to suppress electroosmotic flow with high frequencies. Therefore, the required DC voltage for achieving sample concentration with Joule heating induced TGF technique is remarkably reduced. The lower DC voltage can lead to smaller electroosmotic flow (EOF), thereby reducing the backpressure effect due to the finite reservoir size. It was demonstrated that using the proposed new TGF technique with Joule heating effect under a combined AC and DC field, more than 2500-fold concentration enhancement was obtained within 14 minutes in a PDMS/PDMS microdevice, which is an order of magnitude higher than the literature reported concentration enhancement achieved by microfluidic devices utilizing the Joule heating induced TGF technique.
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ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting
August 1–5, 2010
Montreal, Quebec, Canada
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-5450-1
PROCEEDINGS PAPER
Microfluidics Concentration of Sample Solutes Using Joule Heating Effects Under Combined AC and DC Electric Field
Zhengwei Ge,
Zhengwei Ge
Nanyang Technological University, Singapore
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Chun Yang
Chun Yang
Nanyang Technological University, Singapore
Search for other works by this author on:
Zhengwei Ge
Nanyang Technological University, Singapore
Chun Yang
Nanyang Technological University, Singapore
Paper No:
FEDSM-ICNMM2010-30451, pp. 877-883; 7 pages
Published Online:
March 1, 2011
Citation
Ge, Z, & Yang, C. "Microfluidics Concentration of Sample Solutes Using Joule Heating Effects Under Combined AC and DC Electric Field." Proceedings of the ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting. ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels: Parts A and B. Montreal, Quebec, Canada. August 1–5, 2010. pp. 877-883. ASME. https://doi.org/10.1115/FEDSM-ICNMM2010-30451
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