In-situ AC electroosmotic and thermal perturbation effects for wide range of ionic strength

Reza Hadjiaghaie Vafaie; Aysan Madanpasandi; Reza Hadjiaghaie Vafaie; Aysan Madanpasandi

doi:10.3934/biophy.2017.3.451

AIMS Biophysics

2017, Volume 4, Issue 3: 451-464. doi: 10.3934/biophy.2017.3.451

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In-situ AC electroosmotic and thermal perturbation effects for wide range of ionic strength

Reza Hadjiaghaie Vafaie ^{1
,
,},
Aysan Madanpasandi ²

1.
Department of Electrical Engineering, Microsystem Research Group, University of Bonab, Bonab 5551761167, Iran
2.
Department of Electrical Engineering, Urmia University, Urmia 5756151818, Iran

Received: 20 January 2017 Accepted: 22 June 2017 Published: 30 July 2017

AC electrokinetic flow is promising in designing microfluidic chips for manipulation of biological and chemical samples toward clinical diagnostics. Four pieces of electrodes are optimized to enhance mixing effect inside a straight microchannel. In this research, the mixing dependency on the ionic strength of solutions is investigated. AC electroosmotic secondary flow is responsible for the mixing at low ionic strength (σ < 5 mS m^–1), whereas AC electrothermal secondary flow is proposed to mix high conductive mediums (σ > 5 mS m^–1). The electrode-electrolyte impedance analysis is employed to facilitate the in-situation mixing process by choosing appropriate electrical excitation parameters for the electrodes.
- ac electroosmotic,
- ac electrothermal,
- chaotic regime,
- microfluidic,
- electric conductivity
Citation: Reza Hadjiaghaie Vafaie, Aysan Madanpasandi. In-situ AC electroosmotic and thermal perturbation effects for wide range of ionic strength[J]. AIMS Biophysics, 2017, 4(3): 451-464. doi: 10.3934/biophy.2017.3.451

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Abstract

AC electrokinetic flow is promising in designing microfluidic chips for manipulation of biological and chemical samples toward clinical diagnostics. Four pieces of electrodes are optimized to enhance mixing effect inside a straight microchannel. In this research, the mixing dependency on the ionic strength of solutions is investigated. AC electroosmotic secondary flow is responsible for the mixing at low ionic strength (σ < 5 mS m^–1), whereas AC electrothermal secondary flow is proposed to mix high conductive mediums (σ > 5 mS m^–1). The electrode-electrolyte impedance analysis is employed to facilitate the in-situation mixing process by choosing appropriate electrical excitation parameters for the electrodes.

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