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The Analysis of Time Correlation Function of Light Scattering Intensity and Evaluate the Diffusion Coefficient of Colloid Particle | Wattanasirikoson | งดใช้ระบบ 3-31 กค 66 Burapha Science Journal

The Analysis of Time Correlation Function of Light Scattering Intensity and Evaluate the Diffusion Coefficient of Colloid Particle

Ruttanin Wattanasirikoson, Hassaya Juisakul, Kachain Dangudom

Abstract


In this research has been established on the system of dynamics light scattering and time correlation function analysis in order to study the diffusion of particles. The light source is usage laser diode with wavelength of 650 nm. We measured the scattered light from the sample by using a photodiode detector and a digital oscilloscope to record the signal. The colloidal samples are milk colloid in water with ratio 200:0.3 and in water with proportion 2.5 ppm, 5.0 ppm and 25 ppm. We analyze time correlation function and the diffusion coefficient of the particles. Base on experimental results, we obtain that the diffusion coefficient of colloidal samples were 8.69, 71.89, 70.52 and 59.61 , respectively. There for the light scattering system can be used for analyze time correlation function of scattered light and diffusion coefficient of colloidal samples.

Keywords: dynamic light scattering / correlation function / diffusion coefficient

 


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