CUED Publications database

Electrothermal enrichment of submicron particles in an insulator-based dielectrophoretic microdevice.

Kale, A and Song, L and Lu, X and Yu, L and Hu, G and Xuan, X (2017) Electrothermal enrichment of submicron particles in an insulator-based dielectrophoretic microdevice. Electrophoresis, 39. pp. 887-896.

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Abstract

Insulator-based dielectrophoresis (iDEP) exploits in-channel hurdles and posts etc. to create electric field gradients for various particle manipulations. However, the presence of such insulating structures also amplifies the Joule heating in the fluid around themselves, leading to both temperature gradients and electrothermal flow. These Joule heating effects have been previously demonstrated to weaken the dielectrophoretic focusing and trapping of microscale and nanoscale particles. We find that the electrothermal flow vortices are able to entrain submicron particles for a localized enrichment near the insulating tips of a ratchet microchannel. This increase in particle concentration is reasonably predicted by a full-scale numerical simulation of the mass transport along with the coupled charge, heat and fluid transport. Our model also predicts the electric current and flow pattern in the fluid with a good agreement with the experimental observations.

Item Type: Article
Uncontrolled Keywords: Electrokinetic Electrothermal flow Joule heating Microfluidics Particle enrichment Dimethylpolysiloxanes Electricity Electromagnetic Fields Electroosmosis Electrophoresis Equipment Design Hydrogen-Ion Concentration Microfluidic Analytical Techniques Microspheres Models, Theoretical Surface Properties Temperature Thermodynamics
Subjects: UNSPECIFIED
Divisions: UNSPECIFIED
Depositing User: Cron Job
Date Deposited: 07 Oct 2020 21:14
Last Modified: 10 Apr 2021 22:16
DOI: 10.1002/elps.201700342