U型样品池中电场分布仿真及其对Zeta电位测量的影响  

Simulation of electric field distribution in U-type sample cell and its influence on Zeta potential measurement

作　　者：黄桂琼 邱健[1,2] 韩鹏[1,2] 彭力[1,2] 刘冬梅[1,2] 骆开庆[1,2] HUANG Guiqiong;QIU Jian;HAN Peng;PENG Li;LIU Dongmei;LUO Kaiqing(School of Physics&Telecommunication Engineering,South China Normal University,Guangzhou 510006, China;Guangdong Provincial Engineering Research Center for Optoelectronic Instrument,South China Normal University,Guangzhou 510006, China)

机构地区：[1]华南师范大学物理与电信工程学院,广东广州510006 [2]华南师范大学广东省光电检测仪器工程技术研究中心,广东广州510006

出　　处：《中国粉体技术》2019年第4期26-32,共7页China Powder Science and Technology

基　　金：国家自然科学基金项目,编号:61371176;广东省自然科学基金项目,编号:2014A030313433;广东省科技计划项目,编号:2013B060100014;广州市科技计划项目,编号:201707010485,201704020137

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800nm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0.65V/mm;在样品池底部,电场强度存在较大分布,从0.48到0.75V/mm。在20~60V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。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 R 2 are all more than 0.99 in different electrophoresis voltage,higher than that at the bottom.

关 键 词：ZETA电位 电泳光散射法 电场稳定性 两侧竖直臂 

分 类 号：O436.1[机械工程—光学工程]