I. Kenzhina

Bio: I. Kenzhina is an academic researcher from L.N.Gumilyov Eurasian National University. The author has contributed to research in topics: Irradiation & Materials science. The author has an hindex of 14, co-authored 45 publications receiving 697 citations. Previous affiliations of I. Kenzhina include Laboratory of Solid State Physics.

The study of the prospects for the use of Li 0.15 Sr 0.85 TiO 3 ceramics

Abstract: The paper presents the results of a study of structural characteristics, as well as the possibility of using Li0.15Sr0.85TiO3 ceramics as anode materials for lithium-ion batteries. It has been established that the structure of ceramics is an accumulation of dendritic agglomerates consisting of spherical and spherical nanoparticles with a developed specific surface. According to X-ray phase analysis, the ceramic crystal structure is a mixture of two phases: cubic SrTiO3 and orthorhombic Li2Ti3O7, with a predominance of the SrTiO3 phase. During the life tests, it was found that in the case of the 1000 mAh/g mode, the resource number of cycles is close to 480–500 cycles, which is typical for most silicon-based structures that are standardly used as the basis for lithium-ion batteries. An increase in the charging capacity to 1500 mA h/g leads to a slight decrease in the resource lifetime—420 cycles to a decrease in capacity below 80%. Based on the conducted tests of life tests, the prospects of using ceramics based on Li0.15Sr0.85TiO3 as the basis for lithium-ion batteries have been established.

Design of Radiation Tolerant Materials Via Interface Engineering

Abstract: United States. Dept. of Energy. Office of Basic Energy Sciences (Energy Frontiers Research Center. Award 2008LANL1026)

Phase transformations in FeCo – Fe2CoO4/Co3O4-spinel nanostructures as a result of thermal annealing and their practical application

Abstract: This article is devoted to the study of the efficiency of thermal annealing of nanostructures for phase transformations of the FeCo – Fe2CoO4/Co3O4-spinel type, as well as the subsequent application of the obtained nanotubes as a basis for anode materials of lithium-ion batteries. The choice of these types of nanotubes for use as a basis for anode materials is due to their structure, as well as the great potential of using spinel structures in this area, interest in which is manifested due to the possibility of accelerating lithiation processes and long-term preservation of the specific capacity of batteries. During the study, it was found that for spinel structures, the formation of oxide growths on the surface of nanotubes, the presence of which is associated with oxidative processes during annealing, is observed. Testing the applicability of these structures as anode materials showed that the formation of oxide spinel structures of type Fe2CoO4/Co3O4 leads to an increase in the number of cycles by 1.5–1.7 times compared to the original nanotubes. The efficiency of increasing the lifetime of anode materials is due to an increase in resistance to degradation of Fe2CoO4/Co3O4 structures, due to the formation of oxide phases, leading to an acceleration of lithation processes.

Fe₃O₄ Nanoparticles for Complex Targeted Delivery and Boron Neutron Capture Therapy.

Abstract: Magnetic Fe3O4 nanoparticles (NPs) and their surface modification with therapeutic substances are of great interest, especially drug delivery for cancer therapy, including boron-neutron capture therapy (BNCT). In this paper, we present the results of boron-rich compound (carborane borate) attachment to previously aminated by (3-aminopropyl)-trimethoxysilane (APTMS) iron oxide NPs. Fourier transform infrared spectroscopy with Attenuated total reflectance accessory (ATR-FTIR) and energy-dispersive X-ray analysis confirmed the change of the element content of NPs after modification and formation of new bonds between Fe3O4 NPs and the attached molecules. Transmission (TEM) and scanning electron microscopy (SEM) showed Fe3O4 NPs’ average size of 18.9 nm. Phase parameters were studied by powder X-ray diffraction (XRD), and the magnetic behavior of Fe3O4 NPs was elucidated by Mossbauer spectroscopy. The colloidal and chemical stability of NPs was studied using simulated body fluid (phosphate buffer—PBS). Modified NPs have shown excellent stability in PBS (pH = 7.4), characterized by XRD, Mossbauer spectroscopy, and dynamic light scattering (DLS). Biocompatibility was evaluated in-vitro using cultured mouse embryonic fibroblasts (MEFs). The results show us an increasing of IC50 from 0.110 mg/mL for Fe3O4 NPs to 0.405 mg/mL for Fe3O4-Carborane NPs. The obtained data confirm the biocompatibility and stability of synthesized NPs and the potential to use them in BNCT.