Thermal analysis of reaction producing KXTiO2

Abstract

Fabrication of bio-functional nanoparticles, used to modify the optical properties of cartilage, is performed in several stages. Self-propagating high-temperature synthesis (SHS) is one of the stages of production of oxide bronzes. Stage SHS determines the properties of the bio-functional particles. Only under certain thermophysical parameters of SHS, it is possible to obtain nanoparticles which have abnormally high photothermal effect. The paper presents the results of thermal analysis of phase formation processes of reaction KXTiO2. To control the thermal and structural parameters of synthesis, we used optoelectronic measuring system based on a high-speed video camera. Video analysis was performed in the program ImageJ. Particular attention is paid to optical micro-pyrometry combustion wave and the kinetics of the reaction producing potassium titanium oxide bronzes. Thermal analysis method has allowed to establish the possibility of two reaction flow scenarios. Slow reaction rate of the reaction medium is 0.5 sm2 s−1; the temperature gradient reaches 1000 degree s−1. The temperature gradient during emission of the substance is 1,000,000 degree s−1. And at the low-temperature reaction, the maximum reaction rate reaches 6 sm2 s−1; the temperature gradient is 4000 degree s−1. A short-lived transparent, with respect to optical radiation, phase of oxide bronze was detected. Solidified drops consist of reduced copper. Inside there is needle inclusions of potassium titanium oxide bronze.