ESTIMATION OF PARTICLE SIZE AND SOLUTION CONCENTRATION USING RAY TRACING METHOD ON PARTICLE SIZE ANALYZER MEASUREMENT DATA

• Main Author: Yulita, Dellia
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/58186
• Institution: Institut Teknologi Bandung

Computer simulations has been developed to facilitate the analysis of researchresults carried out analytically and experimentally. Research using a particle size analyzer is widely used as a tool to characterize the particle size distribution of nanoparticle-scale materials. Particle size distributions from polydispersity or multimodal systems are often difficult to obtain due to limitations in existing measurement methods. One of the methods used in characterizing the particle size distribution is dynamic light scattering. In this study, a particle size analyzer has been simulated using the ray tracing method. This simulation was carried out by making several particles with brownian motion in two dimensions which were fired by laser beams at an angle of 90 ? and 173 ? to a detector with a wavelength of 532 nm in a closed box. The simulation of each particle and laser beam that experiences a collision has a mass, initial velocity and initial position. The experimental results of particle size distribution using a particle size analyzer type Horiba SZ-100 on polystyrene material with a size of 100 nm (monodisperse) show the effect of concentration on the resulting detector angle. The higher the concentration of the sample solution, the detector angle automatically detects at an angle of 173 ? and otherwise the detector angle will be detected at an angle of 90 ? . Then the sample was dissolved in 1 mM, 10 mM, 100 mM, 150 mM and 200 Mm NaCl, the Z-average results were close to the true value of 100 nm with the best co-variance 0.35% in 150 mM NaCl. The results data on the particle size analyzer simulation show the same trend as the mechanism that occurs during the data measurement process that has been carried out.