SIMULATIONS ON THE BROWNIAN MOTION OF UPCONVERSION NANOPARTICLES IN FLUID

Abstract

This thesis came up with a conceptual model of Brownian thermometer based on the fluorescent ability of upconversion nanoparticles and the law of Brownian motion for particles in fluid. The working principle is: calculate the number of particles at a specific position in fluid by collecting the data of upconversion fluorescence like light intensity, then estimate the liquid temperature based on the relationship between the temperature of fluid and the distribution of Brownian particles. One core problem of this thesis is to explore the relationship mentioned above, while another one is to find out how upconversion process influences Brownian motion.