THE ALGORITHM FOR PROCESSING MEASUREMENT DATA OF ATTENUATION OF OPTICAL RADIATION BY NANOPARTICLES

Abstract

Nowadays, methods for determining the optical properties of nanoparticles are being actively developed and improved. The most popular are optical methods, in particular those that investigate the dependence of the spectral intensity of radiation passed through the medium with the particles, because they are less sensitive to a particle shape. In the scientific literature there are many works studying separately the scattering and absorption of light. There are few applied scientific works studying attenuation of light. In this paper the algorithm for processing the measurement data of the light attenuation by suspension of nanoparticles is proposed. The algorithm consists of three phases and provides information about the size and the complex refractive index of the particles. In this study, firstly, the average particle size was measured by method of power function, secondly, the optical properties of the particles were measured by method of spectral transparency and thirdly, the function of the particle size distribution was determined. The algorithm has been successfully tested during the measurement of the size and optical properties of Ag–Fe3O4 nanoparticles in water.

Keywords

• absorption efficiency factor
• light attenuation
• light intensity
• nanoparticles size
• optical properties
• refractive index
• transmittance spectrum