超声法纳米颗粒悬浮液粒径测量中温度影响的实验研究

针对医药、化工领域高浓度纳米悬浮液颗粒粒径超声检测中温度影响,采用超声衰减谱法(UAS)对体积浓度30%的纳米铟锡金属氧化物(ITO)水性悬浮液在循环流速800 r/min,温度298～358 K时颗粒粒径分布进行实验。结果表明:温度升高,超声幅值A减小,超声衰减系数增大,颗粒中位径D50增大,颗粒系分布曲线整体朝大颗粒方向偏移,但是分布宽度保持稳定的趋势。同时,将室温(298K)测量结果与CPS离心沉降颗粒测量仪对比,结果较吻合。通过线性回归的方法修正温度对测量结果的影响,超声衰减法能够应用于358K的高温下高浓度纳米颗粒检测。

Experimental study of temperature effect on particle size distribution in highly concentrated nano-particle suspensions using ultrasonic spectra

For studying the temperature effect on measurement of particle size distribution(PSD) of nano-particles in concentrated suspensions in pharmaceutical and chemical industry.By applying ultrasonic attenuation spectra(UAS) technique,the effects of temperature from 298 to 358 K on particle sizing in a 30% v/v aqueous suspension of nanometer Indium Tin oxide(ITO) under 800 r/min circulation flow rate have been experimentally investigated.The results show that as the temperature increases,the attenuation coefficient increases although the ultrasonic amplitude reduces.At the same time,the inversed particle size(D50) becomes bigger and the PSD curve moves towards the direction of larger particles with increasing temperature,while the distribution width remains stable.Furthermore,the UAS method presents the measured PSD according with centrifugal sedimentation particle size analyzer’s measurement at room temperature(298 K).Through a linear regression to calibrate the temperature effect on the particle size results,the UAS can be expanded to the highly concentrated nano-particle at a temperature up to 358K.