一种纳米颗粒粒度测量的快速图像动态光散射法研究

Research on A Novel Fast Imaging Dynamic Light Scattering Method for Nanoparticle Size Measurement

提出了一种新的基于图像相关处理的图像动态光散射纳米颗粒粒度测量方法。该方法采用图像法测量纳米颗粒动态光散射空间分布信号,以很短时间间隔拍摄两幅动态光散射信号空间分布图,再用二维相关算法对这两幅图像进行处理,获得对应衰减时刻的相关系数,根据相应衰减时刻的粒径-相关系数曲线求得纳米颗粒的粒度。与传统动态光散射测量方法相比,将测量时间从百秒级缩短到微秒级,数据处理时间也缩短到毫秒级。对79、482和948 nm三种不同粒径的标准颗粒进行实验,测量结果误差小于7%,可以实现纳米颗粒粒度测量的实时在线。

A novel imaging dynamic light scattering method for nano-particle sizing which greatly reduces the data processing time is proposed. In this method the scattered signal of particles is recorded as images. Two images of spacial distribution of the scattered light signal are taken in a very short time interval, and the correlation coefficient of the two images is calculated, and then the particle size can be determined by the particle size-correlation coefficient curve at the corresponding delay time. Compared to the traditional dynamic light scattering method, the measure time is shortened from hundreds of seconds to microseconds,and the data processing time is shortened to the milliseconds. Three different latex nano-particles（79、482 and948 nm） are measured in the experiments of nano-particles, and the measurement error is less than 7%, which illustrates that the real-time online measurement and data-processing can be truly realized.