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对介电电泳工作原理进行了阐述,并建立了长径比较大的一维纳米线材的介电电泳模型。对碳纳米管采用分段的方法,使分段后的每段在局部电场范围内满足“偶极子近似”理论,并对段与段之间施加位移连续边界条件,使碳纳米管在运动过程中保持整体连续。利用Comsol Multiphysics对碳纳米管组装过程进行仿真,得出碳纳米管能否实现稳定搭接取决于电极尖端的稳定区域的结论。对电极尖端几何形状对电场分布的影响进行了分析,得出了矩形和半圆形更适合碳纳米管的介电电泳组装。
The working principle of dielectrophoresis was described, and the dielectrophoresis model of one-dimensional nano-wire with large aspect ratio was established. The method of segmenting carbon nanotubes is adopted so that each segment after the segment satisfies the theory of “dipole approximation” within the local electric field and applies a continuous displacement boundary condition between the segments so that the carbon nanotubes During the exercise to maintain the overall continuity. The assembly process of carbon nanotubes was simulated by Comsol Multiphysics to find out whether the carbon nanotubes could be stabilized and lapped depending on the stability of the electrode tip. The influence of electrode tip geometry on the electric field distribution was analyzed, and the rectangular and semicircular shape was found to be more suitable for the dielectrophoresis assembly of CNTs.