Experimental validation of the theory of wall effect on dielectrophoresis

Lo, Y. J.; Lei, U.
August 2010
Applied Physics Letters;8/30/2010, Vol. 97 Issue 9, p093702
Academic Journal
Many dielectrophoretic manipulations of particles are performed near walls. The theory of wall effect on dielectrophoresis was recently reported but not experimentally validated. Two experiments with polystyrene particles in deionized water were performed. The dielectrophoretic force normal to an insulated wall is validated by balancing it with buoyancy in an inclined rectangular channel subject to a uniform electric field. The dielectrophoretic force parallel to the wall is validated by balancing it with fluid drag in a diverging channel subject to a radial field. The measurements agree with theory within 7.4% and 8.1% discrepancies, for the normal and parallel forces, respectively.


Related Articles

  • Particle segregation in suspensions subject to high-gradient ac electric fields. Dussaud, Anne D.; Khusid, Boris; Acrivos, Andreas // Journal of Applied Physics;11/1/2000, Vol. 88 Issue 9, p5463 

    Discusses findings of an experimental and theoretical study on the dielectrophoretic motion of individual particles in a static as well as in a flowing suspension subject to high-gradient ac electric fields. Experimental procedures; Movement of particles away from electrodes to concentrate...

  • Chaining and dendrite formation of gold particles. Yuan, Yong J.; Andrews, Mike K.; Marlow, Barry K. // Applied Physics Letters;7/5/2004, Vol. 85 Issue 1, p130 

    Using the time-averaged dielectrophoretic force from an applied electric field, we have observed the assembly of gold colloid particles into nano/microwires, connections and dendrites according to location within different field regions of a lithographically patterned array of microelectrodes....

  • “Force-free” electrophoresis? Yariv, Ehud // Physics of Fluids;Mar2006, Vol. 18 Issue 3, p031702 

    When a colloidal particle is exposed to an externally applied electric field, it acquires an electrophoretic velocity, resulting from fluid slip occurring across the Debye screening layer. When the field is uniformly applied, it is usually assumed that the net neutrality of the combined...

  • Particle-chain formation in a dc dielectrophoretic trap; a reaction-diffusion approach. Nicotra, O. E.; La Magna, A.; Coffa, S. // Applied Physics Letters;8/17/2009, Vol. 95 Issue 7, p073702 

    Dielectrophoresis has proven to be an effective method for the separation of bioparticles such as cells. Nevertheless, the electric polarization induced by nonuniform electric fields leads to a dipole-dipole interaction between particles and therefore the formation of chains is likely to occur....

  • Theory of hot particle stability. Berk, H. L.; Wong, H. V.; Tsang, K. T. // Physics of Fluids (00319171);Sep87, Vol. 30 Issue 9, p2681 

    The investigation of stabilization of hot particle drift reversed systems to low frequency modes has been extended to arbitrary hot beta �H, for systems that have unfavorable field-line curvature. Steep profile equilibria are considered where the thickness of the pressure drop ?, is less...

  • May the fifth force be with us? Muir, Hazel // New Scientist;03/01/97, Vol. 153 Issue 2071, p14 

    Highlights the discovery of an exotic heavy particle at the particle accelerator in Hamburg, Germany. Implications for research; Marriage between quarks and lepton; Probable existence of a fifth physical force outside of gravity, electromagnetism and strong and weak nuclear forces.

  • Resonance broadening theory of plasma turbulence. Ishihara, Osamu; Xia, Huajuan; Hirose, Akira // Physics of Fluids B: Plasma Physics;Feb92, Vol. 4 Issue 2, p349 

    Motion of charged particles in random electric fields is studied analytically. It is shown that the velocity increments of particles are described as a nonstationary stochastic process that results in the time dependency of the Fokker–Planck diffusion coefficient. The diffusion rate of...

  • Dielectrophoresis of Janus particles under high frequency ac-electric fields. Lu Zhang; Yingxi Zhu // Applied Physics Letters;4/5/2010, Vol. 96 Issue 14, p141902 

    Janus polystyrene particles with gold and dielectric multilayer coatings on one hemisphere are shown to drastically alter the dielectrophoresis (DEP) behavior of homogeneous precursor particles under ac-electric fields. Alkanethiol coatings on the gold-coated hemisphere can effectively modify...

  • Studies of antikaon interactions with nucleons at DA[uppercase_phi_synonym]NE. Doce, O. Vazquez; Bazzi, M.; Berucci, C.; Bosnar, D.; Bragadireanu, M.; Cargnelli, M.; Clozza, A.; Curceanu, C.; Ghio, F.; Guaraldo, C.; Iliescu, M.; Ishiwatari, T.; Kienle, P.; Sandri, P. Levi; Marton, J.; Suzuki, K.; Okada, S.; Piscicchia, K.; Lener, M. Poli; Rizzo, A. // AIP Conference Proceedings;10/21/2011, Vol. 1388 Issue 1, p572 

    AMADEUS is an experiment planned to be performed at the DAFNE e+e- collider of the Frascati National Laboratories (Italy) of INFN, to investigate the antikaon-nuclei interaction at low energies. AMADEUS will perform, for the first time, full-acceptance studies of antikaon interaction in light...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics