Particle trapping using dielectrophoretically patterned carbon nanotubes

Khoshmanesh, Khashayar, Zhang, Chen, Nahavandi, Saeid, Tovar-Lopez, Francisco J., Baratchi, Sara, Hu, Zheng, Mitchell, Arnan and Kalantar-Zadeh, Kourosh 2010, Particle trapping using dielectrophoretically patterned carbon nanotubes, Electrophoresis, vol. 31, no. 8, pp. 1366-1375, doi: 10.1002/elps.200900717.

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Title Particle trapping using dielectrophoretically patterned carbon nanotubes
Author(s) Khoshmanesh, Khashayar
Zhang, Chen
Nahavandi, SaeidORCID iD for Nahavandi, Saeid
Tovar-Lopez, Francisco J.
Baratchi, Sara
Hu, Zheng
Mitchell, Arnan
Kalantar-Zadeh, Kourosh
Journal name Electrophoresis
Volume number 31
Issue number 8
Start page 1366
End page 1375
Total pages 10
Publisher Wiley - V C H Verlag GmbH & Co. KGaA
Place of publication Weinheim, Germany
Publication date 2010
ISSN 0173-0835
Keyword(s) assembling
carbon nanotube
Summary This study presents the dielectrophoretic (DEP) assembly of multi-walled carbon nanotubes (MWCNTs) between curved microelectrodes for the purpose of trapping polystyrene microparticles within a microfluidic system. Under normal conditions, polystyrene particles exhibit negative DEP behaviour and are repelled from microelectrodes. Interestingly, the addition of MWCNTs to the system alters this situation in two ways: first, they coat the surface of particles and change their dielectric properties to exhibit positive DEP behaviour; second, the assembled MWCNTs are highly conductive and after the deposition serve as extensions to the microelectrodes. They establish an array of nanoelectrodes that initiates from the edge of microelectrodes and grow along the electric field lines. These nanoelectrodes can effectively trap the MWCNT-coated particles, since they cover a large portion of the microchannel bottom surface and also create a much stronger electric field than the primary microelectrodes as confirmed by our numerical simulations. We will show that the presence of MWCNT significantly changes performance of the system, which is investigated by trapping sample polystyrene particles with plain, COOH and goat anti-mouse IgG surfaces.
Language eng
DOI 10.1002/elps.200900717
Field of Research 091306 Microelectromechanical Systems (MEMS)
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1 Refereed article in a scholarly journal
HERDC collection year 2010
Copyright notice ©2010, WILEY-VCH Verlag
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