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30 Jun 2003

Volume 82, Issue 26, pp. 4633-4843

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Appl. Phys. Lett. 82, 4797 (2003); http://dx.doi.org/10.1063/1.1587262 (3 pages)

Ongi Englander, Dane Christensen, and Liwei Lin
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Normalized method for comparing tensile behaviors of electrorheological fluids

Yu Tian and Qian Zou

Appl. Phys. Lett. 82, 4836 (2003); http://dx.doi.org/10.1063/1.1588740 (3 pages) | Cited 4 times

Online Publication Date: 24 June 2003

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Tensile behaviors of electrorheological (ER) fluids over a wide applied field range have been determined. Normalized tensile stress and the normalized electric field have been proposed to compare the elongations of ER fluids under different conditions. This clearly showed the nature of the stress-strain curves under different initial electric fields and the structure effect during the elongations. Corresponding to the tensile behavior change, the exponent of tensile yield stress versus electric field was also found to vary in different initial field range. © 2003 American Institute of Physics.
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83.80.Gv Electro- and magnetorheological fluids
83.60.Np Effects of electric and magnetic fields

Limitations on the scale of an electrode array for trapping particles in microfluidics by positive dielectrophoresis

Nikolai Markarian, Mike Yeksel, Boris Khusid, Kenneth Farmer, and Andreas Acrivos

Appl. Phys. Lett. 82, 4839 (2003); http://dx.doi.org/10.1063/1.1587882 (3 pages) | Cited 12 times

Online Publication Date: 24 June 2003

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Experiments were performed on dilute suspensions of polarized particles in microfluidics with electrodes of different sizes arranged parallel and perpendicular to the flow. We identified the conditions under which the interparticle electric interactions do not affect the particle trapping in the high-field strength regions. In particular, there exists a lower bound on the scale of the microelectrodes, below which the expected improvement in positioning the particles in the preselected locations cannot be attained. © 2003 American Institute of Physics.
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47.55.Kf Particle-laden flows
47.85.Np Fluidics
82.45.-h Electrochemistry and electrophoresis
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