Microparticle transport along a planar electrode array using moving dielectrophoresis

We present a device that can achieve controlled transport of colloidal microparticles using an array of micro-electrodes. By exciting the micro-electrodes in regular sequence with an AC voltage, a time-varying moving dielectrophoretic force-field is created. This force propels colloidal microparticl...

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Bibliographic Details
Published in:Journal of applied physics 2021-07, Vol.130 (3), p.034902-034902
Main Authors: Zaman, Mohammad Asif, Padhy, Punnag, Ren, Wei, Wu, Mo, Hesselink, Lambertus
Format: Article
Language:English
Subjects:
Applied physics
Arrays
Contact force
Dielectrophoresis
Electrodes
Lab-on-a-chip
Mathematical models
Microelectrodes
Microparticles
Nanoparticles
Numerical models
Polystyrene resins
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Summary:We present a device that can achieve controlled transport of colloidal microparticles using an array of micro-electrodes. By exciting the micro-electrodes in regular sequence with an AC voltage, a time-varying moving dielectrophoretic force-field is created. This force propels colloidal microparticles along the electrode array. Using this method, we demonstrate bidirectional transport of polystyrene micro-spheres. Electromagnetic simulation of the device is performed, and the dielectrophoretic force profile around the electrode array is mapped. We develop a Brownian dynamics model of the trajectory of a particle under the influence of the time-varying force-field. Numerical and experimental results showing controlled particle transport are presented. The numerical model is found to be in good agreement with experimental data. The developed numerical framework can be useful in designing and modeling lab-on-a-chip devices that employ external non-contact forces for micro-/nanoparticle manipulation.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0049126