| Summary: | 碩士 === 國立臺灣大學 === 應用力學研究所 === 96 === Electrorotation is a successful tool for the characterization of particles, in particular, the biological particles. Here we propose a design of the chamber which might have better performance for electrorotation. An optimal chamber is the one that possesses a maximized trapping region of essentially constant and maximized torque on the particles. We have calculated the electric field, the total dielectrophoretic force (including both the conventional and traveling wave dielectrophoretic forces), the dielectrophoretic torque, and trajectories of many particles inside various 2D/3D chambers. By considering both the trapping ability of the particles and the variation of the across the chamber, we found that the ratio of the electrode width to channel width is a crucial parameter. Numerical results for different 2D/3D cases indicate that is the optimize range for the design. A 3D rectangular chamber with four electrodes on both the upper and lower walls is a promising candidate for particle application. Our method is validated by comparing with the analytic solution of a 2D model problem and with experiment in a 3D chamber.
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