Nanodielectrophoresis: Electronic Nanotweezers
نویسنده
چکیده
At neutral pH, DNA is a charged molecule. As such, it responds directly to an electric field, the phenomenon of electrophoresis. In contrast, the phenomenon of dielectrophoresis occurs when there is a dc or an ac electric field gradient. In that case, the development of nonuniform electric fields causes a force on any polarizable object, charged or neutral. The term dielectrophoresis was coined by Pohl in 1951 [1], and the general principles are outlined in his 1978 book of the same title [2]. Since then, the use of microfabricated electrodes has been employed for separating micron-sized objects such as cells, and this technology is currently being integrated with lab-on-a-chip systems. This review article discusses recent progress at extending the practice of dielectrophoresis to the nanoscale, for applications in nanomanufacturing, nanobiotechnology, and molecular electronics. Compared to the use of dielectrophoresis for the manipulation of cells, the use of electric fields at the nanoscale to assemble nanocircuits is still in its infancy. 1.1. Other Reviews
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