PRODUCTION AND THERMAL STABILITY OF SILVER NANOPARTICLES IN THE Ag-O SYSTEM

摘要

The paper examines the structure of porous Ag + NaCl condensates and analyzes the phase and chemical composition and sizes of Ag nanoparticles produced by electron-beam evaporation and vacuum condensation. It is shown that Ag nanoparticles are highly adsorptive to air oxygen in a porous salt matrix. Thermogravimetric analysis is used to study the kinetics of variation in the weight of porous NaCl and Ag + NaCl condensates during heating (to 650°C) and cooling in air. The results are considered in terms of physical and chemical adsorption. Stabilized colloidal systems of silver nanoparticles are obtained. Photon correlation spectroscopy is employed to determine the size of nanoparticles in aqueous solutions with surfactant agents.