Both dispersion behaviors and electrokinetic properties of nanoceria particles in concentrated slurries were researched with the ultrasound attenuation and electroacoustic technologies, and influences of dispersing media were analyzed. It was found that particle size distribution (PSD) of the nanoceria could be fitted well by the bimodal model with lower errors, and zeta potential of the particles could be obtained by direct measurements due to small primary size less than 50 nm. And the media had great influences on both dispersion behaviors and electrokinetic properties of the nanoceria particles in slurries. The nanoparticles could be dispersed to primary particles as a whole in the slurry with de-ionized water when they had absolute zeta potential higher than 30 mV, which accorded well with the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. But non-DLVO interactions would appear and complicate the situation in the slurry with polyelectrolytes. The practical analysis ascertained some basic details in ultrasound and electroacoustic measurement of nanoparticles in concentrated slurries, as well as microscopic mechanisms for dispersion of nanoparticles, both of which would promote understanding and optimizing dispersion behaviors of nanoparticles in concentrated slurries.

利用超声衰减和电声技术研究了纳米二氧化铈在浓浆液中的分散行为和电动特性，并分析了分散介质的影响。已经发现，双峰模型可以很好地拟合纳米氧化铈的粒径分布（PSD），并且误差较低，并且由于小于50nm的小的初级粒径，可以通过直接测量获得粒子的ζ电位。介质对浆料中纳米二氧化铈颗粒的分散行为和电动特性都有很大影响。当纳米粒子的绝对ζ电势高于30 mV时，可以用去离子水将其整体分散到浆料中的整个初级粒子中，这与Derjaguin-Landau-Verwey-Overbeek理论非常吻合。但是会出现非DLVO相互作用，并使带有聚电解质的浆料情况复杂化。实际分析确定了浓缩浆液中纳米颗粒的超声和电声测量以及纳米颗粒分散的微观机理的一些基本细节，这两者都将促进对纳米颗粒在浓缩浆液中的分散行为的理解和优化。