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 journalArticlepeer-review

33 Citations (Scopus)


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
Issue number10
Publication statusPublished - 2019 May

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Biochemistry
  • Clinical Biochemistry


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