A method for concentrating and/or positioning and/or separating particles or cells comprises placing a liquid medium containing the particles and/or cells over a surface having an electrode array associated with the surface, applying an alternating voltage to the electrode array to create an electric...http://www.google.com.au/patents/US6673225?utm_source=gb-gplus-sharePatent US6673225 - Method and apparatus for concentrating and/or positioning particles or cells
