为研究高浓度纳米颗粒悬浮液的粒径分布表征，引入超声谱高浓度颗粒粒径测量理论(核壳模型)，同时搭建了一套超声法高浓度悬浮液粒径测量实验装置，并进行理论模型的实验验证，测得体积浓度为10%至30%的纳米铟锡金属氧化物(Indium Tin Oxides，ITO)水性悬浮液的超声衰减，通过数据反演技术最终获取样品的颗粒粒径分布。结果表明：高浓度纳米颗粒悬浮液中声衰减系数随浓度增加但偏离线性递增趋势，与核壳模型数值模拟更接近。同时，粒径反演的结果与高速离心沉降法也较为吻合。%In order to investigate particle size distribution of nanoparticles in highly concentrated suspensions, a particle size measurement theory (the Core-Shell model) was introduced. Meanwhile, experimental setup for the measurement of particle size distribution in dense suspensions by ultrasonic method was prepared. In order to verify the Core-Shell model, an ultrasonic attenuation spectrum for an aqueous suspension of nanometer Indium Tin oxide (ITO, Indium Tin Oxides) was measured under various volume fractions from 10%to 30%. The results show that the ultrasonic attenuation coefficient of the concentrated nanoparticle suspension increases with concentration, while a distinct deviation trend from linear increasing can be observed, and the Core-Shell model are consistent with the experimental results. Moreover, the sample particle size distribution can be calculated, which shows similar results comparing that obtained from high speed centrifugal particle settling analyzer.
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