Determination of Clausius–Mossotti factors and surface capacitances for colloidal particles

We propose a method to experimentally determine the Clausius–Mossotti factors and surface capacitances of colloidal particles. This two-step method is based on the following: (i) a precise positioning of particles on activated electrodes according to the applied frequency of an electric field and (ii) particles velocities measurements from a pure dielectrophoretic regime to build the Clausius–Mossotti factor. It confirms previous literature methods and measures the surface capacitance values for a wide range of particles such as polystyrene, silica, and gold whose diameters are at least 200 nm.

[1]  H. Morgan,et al.  THE ROLE OF ELECTROHYDRODYNAMIC FORCES IN THE DIELECTROPHORETIC MANIPULATION AND SEPARATION OF PARTICLES , 1999 .

[2]  J. Voldman,et al.  Holding forces of single-particle dielectrophoretic traps. , 2001, Biophysical journal.

[3]  Hughes,et al.  The Dielectrophoretic Behavior of Submicron Latex Spheres: Influence of Surface Conductance. , 1999, Journal of colloid and interface science.

[4]  W. Wlodarski,et al.  Dielectrophoretic separation of carbon nanotubes and polystyrene microparticles , 2009 .

[5]  Castellanos,et al.  Fluid flow induced by nonuniform ac electric fields in electrolytes on microelectrodes. II. A linear double-layer analysis , 2000, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics.

[6]  G. Gradl,et al.  A 3-D microelectrode system for handling and caging single cells and particles , 1999 .

[7]  Mehmet Toner,et al.  Design and analysis of extruded quadrupolar dielectrophoretic traps , 2003 .

[8]  Yingxi Zhu,et al.  Dielectrophoresis of Janus particles under high frequency ac-electric fields , 2010 .

[9]  H. A. Pohl.  The Motion and Precipitation of Suspensoids in Divergent Electric Fields , 1951 .

[10]  R. Pethig.  Review article-dielectrophoresis: status of the theory, technology, and applications. , 2010, Biomicrofluidics.

[11]  P. Koumoutsakos,et al.  Feature point tracking and trajectory analysis for video imaging in cell biology. , 2005, Journal of structural biology.

[12]  T. Honegger,et al.  Design and realization of a microfluidic system for dielectrophoretic colloidal handling , 2009 .

[13]  Rosemary L. Smith,et al.  Dielectrophoretic manipulation of finite sized species and the importance of the quadrupolar contribution. , 2004, Physical review. E, Statistical, nonlinear, and soft matter physics.

[14]  Jonghyun Oh,et al.  Comprehensive analysis of particle motion under non-uniform AC electric fields in a microchannel. , 2009, Lab on a chip.

[16]  Hywel Morgan,et al.  Dielectrophoresis of Submicrometer Latex Spheres. 1. Experimental Results , 1999 .

[17]  N. Aubry,et al.  Control of electrostatic particle-particle interactions in dielectrophoresis , 2006 .

[18]  H. Ou-yang,et al.  Direct measurements of the frequency-dependent dielectrophoresis force. , 2009, Biomicrofluidics.

[19]  L. Latu-Romain,et al.  Transparent Multilevel Aligned Electrode Microfluidic Chip for Dielectrophoretic Colloidal Handling , 2010 .