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Dielectrophoresis is a very promising technique for particle manipulation ona chip. In this study, we demonstrate a controlled mannuvering of polystryreneparticles on a simple paper-and-pencil based device by exploiting theunderlying electrokinetics with primary contribution from dielectrophoretic(DEP) forces. On contrary to other reported DEP devices, the presentconfiguration does not demand a shophitcated laboratory module for creating anon-uniform electric field, which is essential requirement in DEP settings. Wedemonstrate positive dielectrophoresis (pDEP) to trap 1 um size polystyreneparticle for low-conductivity suspending medium, at an applied field strengthof 100 V/cm. In addition, the switching of the trapping direction (positive tonegative dielectrophoresis) can be simply achieved by manipulating theconductivity of the media. We further bring out an optimum range of pH foreffective particle trapping. These results have significant implicationstowards designing cell-on-a-chip based point of care diagnostic devices forresource limited settings.

Controlled Electrokinetic Particle Manipulation using Paper-and-Pencil Microfluidics