Abstract: An electroacoustic probe was developed for measuring acoustic impedance and Zeta potential in colloids simultaneously. Meanwhile, a set of experimental device was established and its stability verified to be good after repeated experiments. Measured acoustic impedance by multiple echo method was incorporated into a theoretical model to calculate Zeta potential. The measurements of Zeta potential in the colloids of nano-loess and nano-titanium dioxide were -52.69 and -16.09 mV, respectively. Zeta potential trend of 5%~30% volume concentration colloids of silica sol was measured and analyzed, showing that the method can be used for high concentration plastic body measurement. The comparison with the results of Malvern Zeta potential measurement instrument yielded a small and accepted deviation. This method is expected to achieve on-line measurement.

Key words: colloid, electroacoustics, Zeta potential

摘要： 基于电声法原理研制了一种能同时用于胶体声阻抗和Zeta电位测量的电声探头，建立了一套测量胶体Zeta电位的实验装置，多次实验证明设备稳定性良好. 通过多次回波测量声阻抗计算Zeta电位，测得纳米黄土及TiO2胶体的Zeta电位分别为-52.69和-16.09 mV，分析了5%~30%(j) SiO2胶体的Zeta电位变化趋势，表明该方法可用于高浓度胶体测量，与马尔文公司光脉动Zeta电位测量仪测量结果偏差较小. 本方法有望实现在线测量Zeta电位.

关键词: 胶体, 电声法, Zeta电位