Article
Energy & Fuels
Fadis Murzakhanov, Andrey Ponomarev, Mohammed A. Khelkhal, Ouassil Amziane, Alexey V. Vakhin, Marat Gafurov
Summary: Heavy and extra-heavy oil are attracting attention as potential replacements for light oil in the near future. Enhanced oil recovery (EOR) methods, including electromagnetic heating, are being developed to effectively exploit unconventional oil sources. This study investigates the effectiveness and mechanisms of electromagnetic heating on heavy oil conversion, using pulsed and high-frequency electron paramagnetic resonance (EPR) techniques.
Article
Geochemistry & Geophysics
Dinara R. Khayrutdinova, Margarita A. Goldberg, Olga S. Antonova, Polina A. Krokhicheva, Alexander S. Fomin, Tatiana O. Obolkina, Anatoliy A. Konovalov, Suraya A. Akhmedova, Irina K. Sviridova, Valentina A. Kirsanova, Natalia S. Sergeeva, Sergey M. Barinov, Vladimir S. Komlev
Summary: Powders based on beta-tricalcium phosphate (3-TCP) containing up to 12.0 mol.% sulphate groups were synthesized through chemical precipitation. Characterization of the materials included X-ray phase analysis, Fourier transform infrared spectroscopy, specific surface area measurement, scanning electron microscopy, energy dispersive analysis, synchronous thermal analysis, mass spectra investigations, and biological assays. The findings showed that the sulphate groups present in the materials were lost during heat treatment at 900 or 1200 C, and these groups contributed to the formation of hydroxyapatite at high concentration. The powders exhibited specific surface areas in the range of 81.7-96.5 m(2)/g, and demonstrated cytocompatibility and matrix properties in cell culture.
Article
Chemistry, Multidisciplinary
Margarita A. A. Goldberg, Olga S. S. Antonova, Nadezhda O. O. Donskaya, Alexander S. S. Fomin, Fadis F. F. Murzakhanov, Marat R. R. Gafurov, Anatoliy A. A. Konovalov, Artem A. A. Kotyakov, Alexander V. V. Leonov, Sergey V. V. Smirnov, Tatiana O. O. Obolkina, Egor A. A. Kudryavtsev, Sergey M. M. Barinov, Vladimir S. S. Komlev
Summary: This research demonstrates the possibility of increasing the specific surface area, pore volume, and pore diameter of mesoporous hydroxyapatite (HA) materials by changing the synthesis medium and ripening the material in the mother solution. Various characterization techniques were used to analyze the HA powders, and the results showed significant changes in particle morphology and characteristics after ripening. The water-acetone sample exhibited the highest pore volume among all samples, reaching 0.593 cm(3)g(-1).
Article
Chemistry, Multidisciplinary
Roman A. Babunts, Yulia A. Uspenskaya, Nikolai G. Romanov, Sergei B. Orlinskii, Georgy V. Mamin, Elena V. Shornikova, Dmitri R. Yakovlev, Manfred Bayer, Furkan Isik, Sushant Shendre, Savas Delikanli, Hilmi Volkan Demir, Pavel G. Baranov
Summary: Semiconductor colloidal nanoplatelets based on CdSe with magnetic Mn2+ ions show modified magneto-optical and spin-dependent properties. High-frequency electron paramagnetic resonance techniques were used to study the spin structure and dynamics of Mn2+ ions in core/shell CdSe/(Cd,Mn)S nanoplatelets. Two sets of resonances were observed, indicating different spin dynamics between surface and inner Mn2+ ions. The interaction between surface Mn2+ ions and 1H nuclei was measured using electron nuclear double resonance, providing information on the distances between Mn2+ ions and 1H nuclei.
Article
Chemistry, Physical
Irina N. Gracheva, Fadis F. Murzakhanov, Georgy V. Mamin, Margarita A. Sadovnikova, Bulat F. Gabbasov, Evgeniy N. Mokhov, Marat R. Gafurov
Summary: We have experimentally studied the spin Hamiltonian of the negatively charged boron vacancy defects (VB-) in hexagonal boron nitride (hBN) and determined the symmetry, anisotropy, and principal values of the hyperfine interaction (HFI) and nuclear quadrupole interaction (NQI). We have found that approximately 84% of the spin density of the VB- electron spin is localized on the three nearest nitrogen atoms, providing valuable spectroscopic data and experimental evidence for the VB- spin localization in a single two-dimensional BN layer.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Polymer Science
Maria Khvorostina, Anton Mironov, Irina Nedorubova, Tatiana Bukharova, Andrey Vasilyev, Dmitry Goldshtein, Vladimir Komlev, Vladimir Popov
Summary: Natural and synthetic hydrogel scaffolds are commonly used in tissue engineering, and encapsulating DNA-encoding growth factors into these scaffolds is a promising approach for delivering genes to the site of bone defects. In this study, 3D printed sodium alginate hydrogel scaffolds were impregnated with model EGFP and therapeutic BMP-2 plasmids to assess their osteogenic properties. The expression levels of MSC osteogenic differentiation markers and bone formation in vivo were evaluated. The results showed that the SA/pBMP-2 scaffolds had a significant increase in new bone volume compared to the SA/pEGFP ones.
Article
Materials Science, Composites
Alexey Nizamutdinov, Elena Lukinova, Nail Shamsutdinov, Pavel Zelenikhin, Alina Khusainova, Marat Gafurov, Sergey Zinchenko, Damir Safin, Maksim Pudovkin
Summary: A promising material for hybrid photodynamic therapy, consisting of Ce0.5Y0.35Tb0.15F3 crystalline nanoparticles and Radachlorin, is investigated. The conjugation of Ce0.5Y0.35Tb0.15F3 nanoparticles and Radachlorin using polyethylenimine (PEI) is tested and shows an energy transfer efficiency of 28%. The stable conjugates of CeF3-Tb3+ NPs and Radachlorin using PEI have a distance of approximately 5 nm between nanoparticles and photosensitizer molecules.
JOURNAL OF COMPOSITES SCIENCE
(2023)
Review
Physics, Fluids & Plasmas
Aleksey V. Dengaev, Mohammed A. Khelkhal, Andrey A. Getalov, Gadel F. Baimukhametov, Aydar A. Kayumov, Alexey V. Vakhin, Marat R. Gafurov
Summary: This paper discusses the chemical transformation of oil components through ultrasound assistance. Ultrasound intensifies heat and mass transfer processes, which is used in various oil production and treatment applications. The cavitation phenomenon caused by ultrasound forms vapor-gas bubbles that intensify processes such as dissolution, extraction, and emulsification.
Article
Engineering, Chemical
Temurali Kholmurodov, Alexey Vakhin, Firdavs Aliev, Yuriy Galyametdinov, Oybek Mirzayev, Arash Tajik, Marat Gafurov
Summary: Steam-based thermal enhanced oil recovery techniques are commonly used to extract heavy oil and bitumen resources. This study investigates the use of oil-soluble surfactants to enhance the catalytic hydrothermal upgrading of heavy oil. The results show that the surfactants effectively reduce the content of resins and asphaltenes, increase the H/C ratio, and enhance steam chamber propagations, leading to improved oil recovery.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Biochemistry & Molecular Biology
Ekaterina A. Kuvshinova, Nataliya V. Petrakova, Yulia O. Nikitina, Irina K. Sviridova, Suraja A. Akhmedova, Valentina A. Kirsanova, Pavel A. Karalkin, Vladimir S. Komlev, Natalia S. Sergeeva, Andrey D. Kaprin
Summary: Bones are a common site for tumor metastasis, making targeted drug delivery necessary. This study developed a method for functionalizing octacalcium phosphate (OCP) bone grafts with the cytostatic drug cisplatin to locally release therapeutic concentrations into bone defects. OCP ceramics were used as a platform for functionalization, with zoledronic acid enhancing cisplatin binding. The functionalized OCP ceramics showed altered physicochemical and bioactive properties, prolonged cisplatin release, and demonstrated biocompatibility, osteoconductivity, osteoinductivity, cytostatic, and antitumor properties in vitro and in vivo.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Polymer Science
Polina M. Tyubaeva, Kristina G. Gasparyan, Alexander Yu. Fedotov, Pavel V. Lobzhanidze, Oleg V. Baranov, Alexey A. Egorov, Vladimir P. Sirotinkin, Vladimir S. Komlev, Anatoly A. Olkhov
Summary: The aim of this study is to produce a highly filled fibrous nonwoven material composed of poly-3-hydroxybutyrate (PHB) and a-tricalcium (a-TCP) phosphate using electrospinning, and to investigate its morphology, structure, and properties. The addition of a-TCP significantly affected the supramolecular structure of the material, allowing control over crystallinity, and resulted in changes in mechanical properties, FTIR spectra, and XRD curves. These findings have the potential to contribute to the development of new osteoconductive materials that can release calcium into the living organism in a controlled manner.
Article
Chemistry, Physical
Irina N. Gracheva, Fadis F. Murzakhanov, Georgy V. Mamin, Margarita A. Sadovnikova, Bulat F. Gabbasov, Evgeniy N. Mokhov, Marat R. Gafurov
Summary: The concept of optically addressable spin states of defects in wide band gap materials has been successfully applied in the development of quantum technologies. By studying the negatively charged boron vacancy defects (VB-) in hexagonal boron nitride (hBN), which has a van der Waals structure, the spin Hamiltonian and interactions with nearby nitrogen atoms have been experimentally explored. The results show a high localization of the VB- electron spin on the three nearest nitrogen atoms. These findings provide valuable spectroscopic data and demonstrate the spin localization in atomic-thin layers.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Polymer Science
Alina Petrova, Georgy Mamin, Oleg Gnezdilov, Inna Fadeeva, Olga Antonova, Anna Forysenkova, Iulian V. Antoniac, Julietta V. Rau, Marat Gafurov
Summary: The study synthesized biocompatible and bioresorbable polymer matrix-mineral composite materials and investigated their properties using electron paramagnetic resonance and nuclear magnetic resonance. The results demonstrated that magnetic resonance methods can be used for quality control and monitoring of the treatment, resorption, and degradation processes of the composites.
