Effect of size factor on the morphology of ablated Cerium dioxide nanoparticles

Purpose of the study. Obtaining ablated Cerium dioxide nanoparticles in a narrow size range with specified maximum and minimum values to determine the dependence of particle morphology on the size factor.
Methods. Nanodispersed solutions of ablated cerium dioxide particles characterized by a narrow-size distribution were obtained using a specially developed technique. The morphology of ablated cerium dioxide nanoparticles obtained by sequential dispersion and centrifugation was studied using transmission electron microscopy. The crystal structure of narrow-size groups of CeO2 nanoparticles was studied using X-ray diffractometry and their coherent scattering regions were calculated.
Results. The studies have shown that with increasing average sizes of ablated cerium dioxide nanoparticles, their morphology becomes spherical. It has been established that with increasing particle size, the intensity of the X-ray diffraction reflection from the (111) crystallographic planes decreases, while the intensity of the reflection from the (200) crystallographic planes increases. It has been established that the sizes of the coherent scattering regions of ablated cerium dioxide nanoparticles for the (111) crystallographic planes vary in the range from (21.8±0.2) nm to (38.2±0.2) nm, and for the (200) crystallographic planes, vary in the range from (22.9±0.2) nm to (42.5±0.2) nm with increasing particle size. The difference between the average sizes of cerium dioxide nanoparticles and the sizes of their CSRs is due to the presence of an amorphous surface layer.
Conclusion. According to the results of the studies presented in this paper, it follows that with an increase in the size of ablated cerium dioxide nanoparticles, their morphology changes predominantly from a cubic shape to a spherical one, which is manifested in a change in the ratio of the intensities of reflections from various crystallographic planes in their structure

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