NDLI: DC-biased AC-electroosmotic and AC-electrothermal flow mixing in microchannels

Content Provider	Royal Society of Chemistry (RSC)
Author	Lam, Yee Cheong Yang, Chun Ng, Wee Yang Rodríguez, Isabel Goh, Shireen
Copyright Year	2009
Abstract	This paper presents a novel approach of mixing two laminar flowing streams in microchannels. The mixer consists of a pair of electrodes disposed along a fluidic channel. By energizing the electrodes with a DC-biased (2.5 V) AC voltage (20 Vpp), an electrokinetic flow is induced with a flow profile perpendicular to that of the incoming laminar streams of liquids to be mixed. As a result, the flow lines of the incoming streams and the induced flow are forced to crossover and very efficient stirring and mixing at short mixing length can be achieved. The mixer can be operated from the AC-electroosmotic (ACEO) (σ = 1 mS/m, f = 100 kHz) to the AC-electrothermal (ACET) (σ = 500 mS/m, f = 500 kHz) flow regimes. The mixing efficiency in the ACEO regime was 92%, with a mixing length of 600 µm ( = 2 µL/min), an estimated mixing time of 69 ms and an induced ACEO flow velocity of ∼725 µm/s. The mixing efficiency in the ACET regime was 65% for a mixing length of ∼1200 µm. The mixer is efficient and suitable for mixing reagents in a fluid media from low to high conductivity as required in diverse microfluidic applications.
Starting Page	802
Ending Page	809
Page Count	8
File Format	HTM / HTML PDF
ISSN	14730197
Volume Number	9
Issue Number	6
Journal	Lab on a Chip
DOI	10.1039/b813639d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	ACEO Microchannel (microtechnology) Laminar flow Electrokinetic phenomena Micrometre Mixing length model Flow velocity
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Biochemistry Bioengineering Biomedical Engineering

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