Exploration of the Influence of Parallel Flow on Dynamic Light Scattering Method
In order to explore the influence of parallel flow on the measurement of nanoparticle size by dynamic light scattering method,this paper analyzes the velocity characteristics of parallel flow,rederives and organizes the intensity autocorrelation function of traditional dynamic light scattering method,and obtains the mathematical ex-pression of the intensity autocorrelation function under parallel flow.The 200 nm polystyrene particles suspension is used for flow experiments.The results show that when there is only a single flow velocity in the particle system,the scattered light intensity autocorrelation function curve presents a strict exponential attenuation superimposed Sinc function oscillation term;when there are multiple independent velocities in the system,the correlation function re-ceived by the detector will be the comprehensive result of the average of each correlation function,its oscillation will be averaged,and the decay speed also depends on the attenuation weight of each curve;when the velocity is parabolic with the spatial position,the baseline oscillation of the light intensity autocorrelation curve is also averaged,and the decay rate is closely related to the velocity distribution model.This work will contribute to the application of dynamic light scattering methods to a wider range of fields,such as online particle size measurement research.
Parallel flowDynamic light scattering methodParticle size measurementLight intensity autocorrela-tion function
万方数据
维普
