Thermal stability of nanocrystalline CeO2 prepared through freeze drying
The growth of ceria nanoparticles during annealing at high temperatures (up to 700°C) has been studied by X-ray diffraction, transmission electron microscopy, and low-temperature nitrogen adsorption measurements. The results indicate that cerium dioxide nanopowders prepared using freeze drying offer enhanced thermal stability.
Методами рентгенофазового и рентгенографического анализа, просвечивающей электронной микроскопии и низкотемпературной адсорбции азота исследованы закономерности [...]
Microwave-hydrothermal synthesis of stable nanocrystalline ceria sols for biomedical uses
A new microwave-hydrothermal process has been developed for preparing stable aqueous sols of nanocrystalline ceria. Transmission electron microscopy, UV-Vis spectroscopy, and dynamic light scattering shows that cerium dioxide nanoparticle size remains unchanged during hydrothermal treatments. Sodium adenosine triphosphate and sodium citrate are proposed for additional stabilization of the sols.
Разработана новая методика гидротермально-микроволнового синтеза стабильных водных [...]
Fractal structure of ceria nanopowders
The formation of ceria nanoparticles from water-alcohol solutions of cerium(III) nitrate has been studied by UV/VIS spectroscopy, low-temperature nitrogen adsorption measurements, x-ray diffraction, transmission electron microscopy, and thermal analysis, and the effect of high-temperature annealing on the fractal structure of the ceria nanopowders has been examined.
Методами УФ-видимой спектроскопии, низкотемпературной адсорбции азота, рентгенофазового анализа, просвечивающей электронной [...]
Formation mechanism of nanocrystalline ceria in aqueous solutions of cerium(III) nitrate and hexamethylenetetramine
The formation mechanism of ceria nanoparticles in solutions of cerium(III) nitrate and hexamethylenetetramine has been studied for the first time, using UV/visible spectroscopy and x-ray diffraction. The process has been shown to involve, as an intermediate step, the formation of cerium(III) hydroxycarbonate. The effects of synthesis temperature and solution composition on the micromorphology of the [...]
