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In addition to optical tweezers, magnetic tweezers and dielectrophoresistechnique, trapping and manipulating micro or nano particles with electrostatictweezers attracted attention in recent years. Here we present a simulationstudy on the contributions of electrostatic energy, change of entropy, as wellas van der Waals interaction in the trapping performance of a 10 nm sized,pentagon shaped nano trap for a charged nanoparticle in saline. The resultsshow that the system has a moderate trapping well of moderate depth; van derWaals interaction enhances the trapping capability, and the entropy terminduced in distribution contributes significantly in the trapping capability.This work provides some valuable clues to the development of practicalsubmicron devices of electrostatic tweezers working in a solution with ions.

Energy issues for construction of 10 nm sized electrostatic traps in saline