3‐D electrode designs for flow‐through dielectrophoretic systems

Traditional methods of dielectrophoretic separation using planar microelectrodes have a common problem: the dielectrophoretic force, which is proportional to ∇|E|2, rapidly decays as the distance from the electrodes increases. Recent advances in carbon microelectromechanical systems have allowed researchers to create carbon 3‐D structures with relative ease. These developments have opened up new possibilities in the fabrication of complex 3‐D shapes. In this paper, the use of 3‐D electrode designs for high‐throughput dielectrophoretic separation/concentration/filtration systems is investigated. 3‐D electrode designs are beneficial because (i) they provide a method of extending the electric field within the fluid. (ii) The 3‐D electrodes can be designed so that the velocity field coincides with the electric field distribution. (iii) Novel electrode designs, not based on planar electrodes designs, can be developed and used. The electric field distribution and velocity fields of 3‐D electrode designs that are simple extensions of 2‐D designs are presented, and two novel electrode designs that are not based on 2‐D electrode designs are introduced. Finally, a proof‐of‐concept experimental device for extraction of nanofibrous carbon from canola oil is demonstrated.

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

[2]  M. Madou,et al.  A novel method for the fabrication of high-aspect ratio C-MEMS structures , 2005, Journal of Microelectromechanical Systems.

[3]  H. A. Pohl,et al.  Separation of Living and Dead Cells by Dielectrophoresis , 1966, Science.

[4]  E. Khorshid,et al.  A review of the effect of sand dust and filtration on automobile engine wear , 1991 .

[5]  Xiangyun Song,et al.  Electrochemical Studies of Carbon Films from Pyrolyzed Photoresist , 1998 .

[6]  Marc Madou,et al.  Validation of lithography based on the controlled movement of light-emitting particles , 2004, SPIE Advanced Lithography.

[7]  William Morris.  The American Heritage dictionary of the English language , 1969 .

[8]  Hywel Morgan,et al.  AC ELECTROKINETICS: COLLOIDS AND NANOPARTICLES. , 2002 .

[9]  Marc Madou,et al.  Photoresist‐Derived Carbon for Microelectromechanical Systems and Electrochemical Applications , 2000 .

[10]  H. Jost,et al.  Tribology — Origin and future , 1990 .

[11]  R. Weisman,et al.  Four degrees of separation , 2003, Nature materials.

[12]  J. P. Schwar,et al.  Factors Affecting Separations of Suspensions in Nonuniform Electric Fields , 1959 .

[13]  R. Krupke,et al.  Separation of Metallic from Semiconducting Single-Walled Carbon Nanotubes , 2003, Science.

[14]  K. Kaler,et al.  A novel dielectrophoresis-based device for the selective retention of viable cells in cell culture media. , 1997, Biotechnology and bioengineering.

[15]  B. Dunn,et al.  C-MEMS for the Manufacture of 3D Microbatteries , 2004 .

[16]  R. Pethig,et al.  Dielectrophoretic separation of bacteria using a conductivity gradient. , 1996, Journal of biotechnology.

[17]  N. Aubry,et al.  Dielectrophoresis of nanoparticles , 2004, Electrophoresis.

[18]  Sheikh A. Akbar,et al.  Pyrolysis of Negative Photoresists to Fabricate Carbon Structures for Microelectromechanical Systems and Electrochemical Applications , 2002 .

[19]  Rashid Bashir,et al.  Dielectrophoresis and electrohydrodynamics-mediated fluidic assembly of silicon resistors , 2003 .

[20]  M. Madou.  Fundamentals of microfabrication : the science of miniaturization , 2002 .

[21]  J. Fodor.  Improving utilisation of potential i.c. engine life by filtration , 1979 .

[22]  Y. Huang,et al.  Cell separation by dielectrophoretic field-flow-fractionation. , 2000, Analytical chemistry.

[23]  Ronald Pethig,et al.  The removal of human leukaemia cells from blood using interdigitated microelectrodes , 1994 .

[24]  Nadine Aubry,et al.  Dynamics of Electrorheological Suspensions Subjected to Spatially Nonuniform Electric Fields , 2004 .

[25]  E. Cummings,et al.  Insulator‐based dielectrophoresis for the selective concentration and separation of live bacteria in water , 2004, Electrophoresis.

[26]  Peter R. C. Gascoyne,et al.  Dielectrophoretic separation of mammalian cells studied by computerized image analysis , 1992 .

[27]  Kenji Fujita,et al.  Deterioration of antiwear properties of diesel engine oils during use , 1988 .

[28]  F F Becker,et al.  Separation of human breast cancer cells from blood by differential dielectric affinity. , 1995, Proceedings of the National Academy of Sciences of the United States of America.