摘要: 为探究电场稳定性对测量纳米颗粒溶液 Zeta 电位的影响，对主流的 U 型样品池进行电场仿真实验; 根据仿真结果发现的 U 型样品池底部的电场强度分布存在不均匀的问题，选取 U 型样品池两侧竖直臂的中点位置作为新的探测点，并采用粒径为 800 nm 的聚苯乙烯带电颗粒悬浮液设计基于电泳光散射法的对比实验。结果表明:U 型样品池两侧竖直臂，其电场强度稳定在 0．65 V/mm; 在样品池底部，电场强度存在较大分布，从 0．48到 0．75 V/mm。在 20 ～ 60 V 的不同电泳电压条件下，两侧竖直臂 Zeta 电位的最高标准差为 2．94，是底部 Zeta 电位最低标准差的 1 /2;其多普勒频移与电泳电压的一次线性拟合度 Ｒ2 超过 0．99，而底部的仅为 0．97。
关键词: Zeta 电位；电泳光散射法；电场稳定性；两侧竖直臂
Abstract: The influence of electrophoretic electric field in Zeta potential measurement is theoretically analyzed，and the electric field simulation experiment was carried out on the mainstream U-type sample cell．It was found that the distribution of electric field intensity at the bottom is not uniform．In order to improve its accuracy and precision，the left arm and right arm of the sample cell were defined as the experimental measurement area．In the experiment，the range of electrophoresis voltage was increased from 20 V to 60 V．The results show that when the measurement point is selected in the left arm and right arm in the U－type sample cell，the Doppler shifts increase linearly．And the linear correlation coefficient Ｒ2 are all more than 0．99 in different electrophoresis voltage，higher than that at the bottom．
Keywords: Zeta potential; electrophoretic light scattering; electric field stability; vertical arm measurement on both sides
