García-Sánchez Pablo, Flores-Mena Jose Eladio, Ramos Antonio
Departamento de Electrónica y Electromagnetismo, Facultad de Física, Universidad de Sevilla, Avda. Reina Mercedes s/n, 41012 Sevilla, Spain.
Facultad de Ciencias de la Electrónica, Benemérita Universidad Autónoma de Puebla, Av. San Claudio y 18 Sur, San Manuel, Puebla 72570, Mexico.
Micromachines (Basel). 2019 Jan 29;10(2):100. doi: 10.3390/mi10020100.
We study theoretically the dielectrophoresis and electrorotation of a semiconducting microsphere immersed in an aqueous electrolyte. To this end, the particle polarizability is calculated from first principles for arbitrary thickness of the Debye layers in liquid and semiconductor. We show that the polarizability dispersion arises from the combination of two relaxation interfacial phenomena: charging of the electrical double layer and the Maxwell⁻Wagner relaxation. We also calculate the particle polarizability in the limit of thin electrical double layers, which greatly simplifies the analytical calculations. Finally, we show the model predictions for two relevant materials (ZnO and doped silicon) and discuss the limits of validity of the thin double layer approximation.
我们从理论上研究了浸没在水性电解质中的半导体微球的介电泳和介电旋转。为此，从第一性原理计算了液体和半导体中德拜层任意厚度下的粒子极化率。我们表明，极化率色散源于两种弛豫界面现象的组合：双电层充电和麦克斯韦-瓦格纳弛豫。我们还计算了薄双电层极限下的粒子极化率，这大大简化了分析计算。最后，我们展示了两种相关材料（氧化锌和掺杂硅）的模型预测，并讨论了薄双电层近似的有效性极限。
