Electroosmotic flow of non-Newtonian fluids in a constriction microchannel

Chien Hsuan Ko, Di Li, Amirreza Malekanfard, Yao Nan Wang, Lung-Ming Fu, Xiangchun Xuan

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Insulator-based dielectrophoresis has to date been almost entirely restricted to Newtonian fluids despite the fact that many of the chemical and biological fluids exhibit non-Newtonian characteristics. We present herein an experimental study of the fluid rheological effects on the electroosmotic flow of four types of polymer solutions, i.e., 2000 ppm xanthan gum (XG), 5% polyvinylpyrrolidone (PVP), 3000 ppm polyethylene oxide (PEO), and 200 ppm polyacrylamide (PAA) solutions, through a constriction microchannel under DC electric fields of up to 400 V/cm. We find using particle streakline imaging that the fluid elasticity does not change significantly the electroosmotic flow pattern of weakly shear-thinning PVP and PEO solutions from that of a Newtonian solution. In contrast, the fluid shear-thinning causes multiple pairs of flow circulations in the weakly elastic XG solution, leading to a central jet with a significantly enhanced speed from before to after the channel constriction. These flow vortices are, however, suppressed in the strongly viscoelastic and shear-thinning PAA solution.

Original languageEnglish
Pages (from-to)1387-1394
Number of pages8
JournalElectrophoresis
Volume40
Issue number10
DOIs
Publication statusPublished - 2019 May 1

Fingerprint

Electroosmosis
Non Newtonian flow
Microchannels
Constriction
Shear thinning
Fluids
Povidone
Polymer solutions
Electrophoresis
Flow patterns
Elasticity
Vortex flow
Electric fields
Polymers
Imaging techniques

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Biochemistry
  • Clinical Biochemistry

Cite this

Ko, Chien Hsuan ; Li, Di ; Malekanfard, Amirreza ; Wang, Yao Nan ; Fu, Lung-Ming ; Xuan, Xiangchun. / Electroosmotic flow of non-Newtonian fluids in a constriction microchannel. In: Electrophoresis. 2019 ; Vol. 40, No. 10. pp. 1387-1394.
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Ko, CH, Li, D, Malekanfard, A, Wang, YN, Fu, L-M & Xuan, X 2019, 'Electroosmotic flow of non-Newtonian fluids in a constriction microchannel', Electrophoresis, vol. 40, no. 10, pp. 1387-1394. https://doi.org/10.1002/elps.201800315

Electroosmotic flow of non-Newtonian fluids in a constriction microchannel. / Ko, Chien Hsuan; Li, Di; Malekanfard, Amirreza; Wang, Yao Nan; Fu, Lung-Ming; Xuan, Xiangchun.

In: Electrophoresis, Vol. 40, No. 10, 01.05.2019, p. 1387-1394.

Research output: Contribution to journalArticle

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AU - Xuan, Xiangchun

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