Plasma Dynamic Synthesis of Titanium Dioxide with Controlled Particle Size Distribution

• Published in: Surface investigation, x-ray, synchrotron and neutron techniques Vol. 16; no. 1; pp. 42 - 47
• Main Authors: Sivkov, A. A., Vympina, Yu. N., Rahkmatullin, I. A., Ivashutenko, A. S., Shanenkova, Yu. L., Shanenkov, I. I., Nikitin, D. S.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.02.2022; Springer Nature B.V
• Subjects: Anatase; Buffers; Chambers; Chemical reactions; Chemistry and Materials Science; Differential pressure; Materials Science; Particle size; Particle size distribution; Phase composition; Separation; Surfaces and Interfaces; Synthesis; Thin Films; Titanium; Titanium dioxide; X-ray diffractometry; titanium dioxide; transmission electron microscopy; plasma dynamic synthesis; anatase; rutile; differential pressure separation
• ISSN: 1027-4510; 1819-7094
• DOI: 10.1134/S1027451022010177

Experiments on the plasma dynamic synthesis of ultradispersed titanium dioxide powders using differential pressure separation for controlling their particle size distribution are carried out. The method used consists in the transfer of a finely dispersed fraction from the main chamber, where the plasma-chemical reaction occurs, to the buffer chamber upon opening a bypass valve due to the pressure difference. The method makes it possible to separate fractions and obtain materials with a dominant content of fine particles smaller than 1–2 μm (up to 10 nm) and coarse particles about 10–100 μm in size during synthesis without the use of additional devices and separation methods. The experimental differential pressure separation system allows one to change the time of opening the bypass valve between the main and buffer chambers, which affects the weight ratio and phase composition of the low- and finely dispersed fractions. The efficiency of the method in obtaining the maximum mass of the finely dispersed fraction with the highest (~80 wt %) anatase content at a bypass valve opening time of ~10 s is demonstrated and confirmed by X-ray diffractometry and transmission electron microscopy.