Work number - M 41 FILED
Presented by the I.M. Frantsevich Institute for Problems of Materials Science of National Academy of Sciences of Ukraine
Author: Umerova S. O.
The aim of the work isdeveloping of physical-chemical and rheological principles of formation of nanofluids based on the ВаТіО3nanopowder for obtaining the elastic ceramic films with thickness less than 1 µm and surface roughness comparable with the size of functional nanoparticle for printed electronics components by screen-printing method.
Theoretical investigations and the conducted experiments have been showed that unlike traditional suspensions based on micron powders the developed nanofluids were structured systems exhibiting shear thickening at the initial stage of deformation. Thus, they characterized with thixotropic, rheopexic – thixotropic and rheopexic – pseudoplastic – thixotropic type of flow. It was established that nanofluids with rheopexic – thixotropic character of flow without intermediate pseudoplastic allow formation of thin smooth films of nanocrystalline BaTiO3. Herewith, the films with thickness of 0.7 – 0.8 µm and surface roughness 20 – 25 nm were obtained by screen-printing method. The results of testing the films are confirmed by the certificate of Agromat-Decor, Ltd. "Estimates of the parameters of raw ceramic layers of microcapacitors based on the BaTiO3 nanopowder obtained by screen printing" dated July 6, 2016 and the certificate of LLC "ETON" "Approbation of thick-film elements of multi-layer ceramic capacitors based on the nanopowder BaTiO3 and plasticized organic binder" dated June 5, 2016.
Number of publications:21 scientific works: 9 articles in specialized domestic and foreign periodicals, 12 abstracts in the proceedings of relevant scientific conferences. In 2017 the 1 candidate thesis was defended.