Systems of manganites with enhanced electromagnetic parameters
V. K. Karpasyuk, A. G. Badelin, I. M. Derzhavin, D. I. Merkulov
The effects of paired substitution of 3d10-cations (Zn2+0.5Ge4+0.5) or 2p6- and 3p6-cations (Mg2+0.5Ti4+0.5) for manganese in polycrystalline manganites of specifically designed systems La0.8-xSr0.2 + xMn3+0.8 – 2x – 2γMn4+0.2+x+2γ(Me2+0.5Me4+0.5)xO3+γ on their electromagnetic parameters have been studied and compared. Temperature dependences of the resistance, magnetoresistance and magnetostriction constant were measured. In proposed systems the linear rise of strontium concentration simultaneously with increasing number of substituents allows high characteristics of manganites to be maintained due to the increase in the concentration of free charge carriers, through which ferromagnetic double exchange interaction is carried out. The data obtained are also compared with the properties of Ga3+(3d10)-substituted manganites as peculiar standards. All sintered (Zn,Ge)-contained manganites in the temperature range from 100 to 293 K have metallic type of conductivity, while (Mg,Ti)-substituted samples exhibit semiconducting features, and Ga3+-contained compositions reveal “metal-semiconductor” transition point (Tms). The annealing under conditions ensuring stoichiometric oxygen content leads to the shift of this transition towards lower temperatures in manganites with 3d10-substituents, but to the increase of Tms in compositions with substituting p6-cations. In the investigated systems the absolute values of negative magnetoresistance up to ~ 90 – 200 % at 120 – 150 K in the field 9.2 kOe are obtained, and the linear magnetostriction constant reaches the record values of about 10–3 in the field 4.6 kOe. Manganite La0.65Sr0.35Mn0.85Ga0.15O3 with a little temperature dependence of magnetoresistance of ~ 20 % at room temperatures is of particular service for magnetic field sensors. Possible approaches to the interpretation of established regularities demonstrating the role of electronic configurations of substituents for manganese in the formation of the properties of manganites and interesting for the development of new materials for electronics are discussed.
Keywords: specifically designed systems, paired substituents, electron shells, “metal-semiconductor” transition, colossal magnetoresistance, giant magnetostriction.
Karpasyuk Vladimir — Astrakhan State University (20a Tatishchev Str., Astrakhan, 414056, Russia), Dr.Sci. (Phys-Math), professor, Director and Scientific Head of the Centre for functional magnetic materials, specialist in the field of the physics of magnetic materials, semiconductors and dielectrics. E-mail: vkarpasyuk@mail.ru.
Badelin Alexey — Astrakhan State University (20a Tatishchev Str., Astrakhan, 414056, Russia), junior researcher, specialist in the condensed matter physics and ceramic processing. E-mail: alexey_badelin@mail.ru.
Derzhavin Igor — Astrakhan State University (20a Tatishchev Str., Astrakhan, 414056, Russia), junior researcher, specialist in the condensed matter physics and ceramic processing. E-mail: derzh_igor@mail.ru.
Merkulov Denis — Astrakhan State University (20a Tatishchev Str., Astrakhan, 414056, Russia), Ph.D. (Phys-Math), head of laboratory, specialist in the field of condensed matter physics, materials science for semiconductors and dielectrics. E-mail: merkul_d@mail.ru.
Reference citing
Karpasyuk V. K., Badelin A. G., Derzhavin I. M., Merkulov D. I. Sistemy manganitov s povyshennymi ehlektromagnitnymi parametrami [Systems of manganites with enhanced electromagnetic parameters]. Perspektivnye Materialy — Advanced Materials (in Russ), 2018, no. 4, pp. 5 – 13.
DOI: 10.30791/1028-978X-2018-4-5-13
Biomedical materials based on polymer-colloid dispersion of succinamide chitosan-sol of silver iodide
D. R. Valiyev, M. V. Bazunova, V. V. Chernova,
A. S. Shurshina, E. I. Kulish
The polymer-colloid dispersions which are products of interaction of macromolecules with inorganic sol are of special interest among polymeric materials of biomedical appointment. The water-soluble sodium salt of chitosan suссinamide (SChT) having a complex of unique properties among which there is biocompatibility with body tissues, bacteriostaticity, ability to biodegradation and so on, has been used as a basis for creation of film composite materials for biomedical appointment. Sol of silver iodide (AgI) known for its bactericidal properties was used as colloidal dispersion. Microbiological researches have shown that films on a basis of polymer-colloidal dispersion SChT-AgI possess the expressed bactericidal action while individual sol and individual SChT the chosen concentration were characterized only by bacteriostatic effect. It was revealed that polymer-colloidal dispersion SChT-AgI promotes increase in resistance of components of blood to action of hemolytic agents. It is established that addition of AgI leads to increase of tensile strength and decrease of elongation fracture. It is shown that the received films in all cases destroying much more slowly and to a lesser extent, than an initial film of SChT when maintaining good water-absorbing ability.
Keywords: polymer-colloid dispersions, chitosan, a film, silver iodide.
Valiyev Denis — Bashkir State University (Ufa, 450074, Zacky Validi St. 32), graduate student of chemical faculty, specialist in the field of chemistry of polymers.
Bazunova Marina — Bashkir State University (Ufa, 450074, Zacky Validi St. 32), PhD (Chem), associate professor of high-molecular compounds and the general chemical technology, expert in the field of chemical technology. E-mail: mbazunova@mail.ru.
Chernova Valentina — Bashkir State University (Ufa, 450074, Zacky Validi St. 32), PhD (Chem), associate professor of high-molecular compounds and the general chemical technology, expert in the field of physico-chemistry of polymers. E-mail: my_life82@mail.ru.
Shurshina Angela — Bashkir State University (Ufa, 450074, Zacky Validi St. 32), PhD (Chem), associate professor of high-molecular compounds and the general chemical technology, expert in the field of physico-chemistry of polymers. E-mail: anzhela_murzagil@mail.ru.
Kulish Elena — Bashkir State University (Ufa, 450074, Zacky Validi St. 32), DrSci (Chem), associate professor, manager of department of high-molecular compounds and the general chemical technology, expert in the field of physico-chemistry of polymers. E-mail: onlyalena@mail.ru.
Reference citing
Valiyev D. R., Bazunova M. V., Chernova V. V., Shurshina A. S., Kulish E. I. Materialy biomedicinskogo naznacheniya na osnove polimer-kolloidnoj dispersii sukcinamid hitozana-zol' jodida serebra [Biomedical materials based on polymer-colloid dispersion of succinamide chitosan-sol of silver iodide]. Perspektivnye Materialy — Advanced Materials (in Russ), 2018, no. 4, pp. 14 – 23.
DOI: 10.30791/1028-978X-2018-4-14-23
Porous carbonated hydroxyapatite ceramics obtained by the original method of “ceramic biscuit” for medicine
I. V. Fadeeva, A. S. Fomin, Ya. Yu. Filippov, S. A. Bozhkova,
D. V. Labutin, S. M. Barinov
Carbonated hydroxyapatite (CHA) is a perspective material for reconstructive surgery in the healing of bone defects arising from trauma and extensive surgery, due to the proximity of the chemical and phase composition of the inorganic component of the native bone tissue. The original method of obtaining porous CHA ceramic granules was developed. To produce a system of interconnected pores the foam of proteines with sucrose was used. The optimum ratio of protein foam with a ceramic powder, CHA, was established equal to 3:1 to obtain a porous ceramics with a homogenous structure. Studied mechanical properties of porous ceramics CHA obtained at different ratios of protein foam: ceramic powder, CHA with increasing amounts of ceramic powder of KGA in the mixture, the compressive strength of CHA-ceramics is reduced from 6 – 7 to 2 – 3 MPa. The microstructure of CHA ceramics is characterized by the presence of pores of different size — from parts of microns to tens of microns. In vitro studies the porous CHA ceramics In the evaluation of the influence of granules on the growth of MMSC rats in vitro revealed a decrease in cell viability when the concentration of the granules. Reduced viability of MMSCs in the presence of the granules can be associated with alkalinisation of the environment of the sintering additive.
Keywords: сarbonated hydroxyapatite, porous ceramic granules.
Fadeeva Inna — Baikov Institute of Metallurgy and Material Science, RAS (119334, Leninsky avenue, 49, Moscow, Russia), leading researcher, PhD, specialist in the field of inorganic chemistry and materials in medicine. E-mail: fadeeva_inna@mail.ru.
Fomin Alexander — A.A. Baikov Institute of Metallurgy and Material Science, RAS (119334, Leninsky avenue, 49, Moscow, Russia), senior researcher, PhD, specialist in the field of inorganic chemistry and materials in medicine. E-mail: alex_f81@mail.ru.
Filippov Yaroslav — M.V. Lomonosov Moscow State University (Lomonosov MSU), Institute of Mechanics (119192, Michurinsky avenue, 1, Moscow, Russia), senior researcher, PhD, specialist in the field of inorganic chemistry and mechanic research. E-mail: filippovya@gmail.com.
Bozhkova Svetlana — Russian Scientific Research Institute of Traumatology and Orthopedicsnamed after R.R. Vreden (195427, Baikova, 8, St.Petersburg, Russia), head of the Department, clinical pharmacologist of the highest category, doctor of medical Sciences, specialist in clinical pharmacology,E-mail: clinpharm-rniito@yandex.ru.
Labutin Dmitry — Russian Scientific Research Institute of Traumatology and Orthopedicsnamed after R.R. Vreden (195427, Baikova, 8, St.Petersburg, Russia), junior researcher, specialist in clinical pharmacology. E-mail: clinpharm-rniito@yandex.ru.
Barinov Sergey — A.A. Baikov Institute of Metallurgy and Material Science, RAS (119334, Leninsky avenue, 49, Moscow, Russia), corr.-member of RAS, Dr.Sci., general researcher, specialist in the field of materials in medicine. E-mail: barinov_s@mail.ru.
Reference citing
Fadeeva I. V., Fomin A. S., Filippov Ya. Yu., Bozhkova S. A., Labutin D. V., Barinov S. M. Poristaya karbonatgidroksiapatitovaya keramika, poluchennaya po original'nomu metodu “keramicheskogo biskvita”, dlya mediciny [Porous carbonated hydroxyapatite ceramics obtained by the original method of “ceramic biscuit” for medicine]. Perspektivnye Materialy — Advanced Materials (in Russ), 2018, no. 4, pp. 24 – 30.
DOI: 10.30791/1028-978X-2018-4-24-30
Effect of mechanical treatment on the structure
and properties of natural zeolite
A. Y. Buzimov, S. N. Kulkov, L. A. Gömze, R. Géber, I. Kocserha
The results are presented of a study of the effect of mechanical treatment in a planetary ball mill on morphology, specific surface area, structure and phase composition of natural zeolite of Tokai deposit. Was used the following methods: SEM, X-RAY, BET, laser diffraction, elemental analysis. Calculations of the X-ray pattern showed that the structure of zeolite consists of seven different phases: smectite, quartz, cristobalite, clinoptilolite, illite, orthoclase, calcite. The initial zeolite-average was 27 µm. After activation of 20 minutes, particle size was 5.5 µm and after 600 minutes of milling time, the particle size became 28 µm. Moreover, most particles have lost their initial shape and converted into a spherical shape during the mechanical activation. It is shown that during the first 60 minutes of treatment in a planetary mill, zeolite powder particles are milling and the surface area increases, reaching 33 m2/g. Further mechanical activation is due to agglomeration of the particles and a decreases in the specific surface area. X-ray diffraction analysis is showed that the zeolite powder consists of four phases: hexagonal, monoclinic, orthorhombic and tetragonal modifications. Mechanical treatment of natural zeolite leads to a decrease in the coherent scattering regions and to the growth of microdistortions of the crystal lattice. It is show that prolonged mechanical activation it occurred amorphisation, which increase from 13% to 52%. Changes of the specific surface area of BET methods and calculated from coherent scattering regions have the same character. The phase composition determines the specific surface area of the natural zeolite.
Key words: natural zeolite, mechanical treatment, specific surface area, crystal structure, phase composition.
Buzimov Aleksandr — Institute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences (634055, Russia, Tomsk, pr. Akademicheskii 2/4), researcher; National Research Tomsk State University (634050, Russia, Tomsk, Lenin Avenue, 36), Physics and Engineering department, graduate student, specialist in the field of materials science of zeolite materials. E-mail: buzimov92@gmail.com.
Kulkov Sergei — Institute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences (634055, Russia, Tomsk, pr. Akademicheskii 2/4), Dr.Sci., professor, head of laboratory; National Research Tomsk State University (634050, Russia, Tomsk, Lenin Avenue, 36), Physics and Engineering department, head of department, specialist in the field of materials science of metal and ceramic composites with structural transformations. E-mail: kulkov@ispms.ru.
László A Gömze — University of Miskolc (3515, Hungary, Miskolc), professor, head of Department; specialist in the field of materials science of ceramic and zeolite materials. E-mail: femgomze@uni-miskolc.hu.
István Kocserha — University of Miskolc (3515, Hungary, Miskolc), PhD, researcher, specialist in the field of materials science of ceramic materials. E-mail: istvan.kocserha@uni-miskolc.hu.
Róbert Géber — University of Miskolc (3515, Hungary, Miskolc), PhD, researcher, specialist in the field of materials science of ceramic materials. E-mail: femgeber@uni-miskolc.hu.
Reference citing
Buzimov A.Y., Kulkov S.N., Gömze L.A., Géber R., Kocserha I. Vliyanie mekhanicheskoj obrabotki na strukturu i svojstva prirodnogo ceolita [Effect of mechanical treatment on the structure and properties of natural zeolite]. Perspektivnye Materialy — Advanced Materials (in Russ), 2018, no. 4, pp. 31 – 39.
DOI: 10.30791/1028-978X-2018-4-31-39
Mechano-chemical synthesis and study of hybrid nanocomposite on polypropylene and kaolin base
R. V. Kurbanova, N. T. Kakhramanov, A. M. Muzafarov,
Y. N. Gahramanly, N. A. Chernyavskaya, U. M. Mammadli
The influence of kaolin, dressing (aminethyl-aminpropyl-trimetoksisilan) and zinc stearate additives concentration on the basic physical and mechanical properties of nanocomposites on polypropylene base is considered. Addition of more than 10 wt. % of mineral filler decreases the failure stress and specific elongation of the considered samples. A probable cause of the deteriorated properties is the excess amount of nano-sized filler in the polymer matrix that leads to the accumulation of nanoparticles in amorphous areas. Possible mechanisms of filler interaction with coupling agent are considered. Experimental studies of the selective and joint effect of the ingredients of the composite on the basic physical and mechanical properties have been carried out. It is shown that the joint use of zinc stearate and coupling agent allows to increase the mechanical properties such as failure stress, bending strength, elongation and melt flow index. Improved flow of the melt creates certain technological advantages for the considered high-filled nanocomposites, intended for their processing by extrusion and injection molding.
Keywords: dressing, modification, nanocomposites, filler, kaolin, zinc stearate.
Kurbanov Ren Vagif gyzy — Azerbaijan State Oil and Industry University (AZ1010, Baku, prosp. Azadlig-20), PhD (Chem), senior lecturer of chair, expert in the field of dressing and mehano-chemical synthesis of hybrid polymer-inorganic nanocomposites. E-mail: rena06.72@yandex.ru.
Kakhramanov Najaf Tofik — Institute of polymeric materials of National Academy of sciences of Azerbaijan (AZ5004, Sumqayit, S.Vurguna’s street 124), DrSci (Chem), professor, managing laboratory, expert in the field of updating of polymers filler, receptions of mixes compatible polymer-polymeric, chemical updating, polymers, interrelation between structure and properties of polymeric materials. E-mail: najaf1946@rambler.ru.
Muzafarov Aziz Mansurovich — A.N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences (119991, GSP-1, Moscow, 119334, Vavilov street 28), DrSci (Chem), professor, academician of RAS, director of institute, expert in the field of synthesis of organosilicone polymer connections, organosilicone dendrimers and superbranched out polymers. By means of the methods developed by it have been received various molecular nanoobjekt: multibeam functional polymeric stars, nano-gel. E-mail: larina@ineos.ac.ru.
Gahramanly Yunis Najaf — Azerbaijan State Oil and Industry University (AZ1010, of Baku, prosp. Azadliq 20), DrSci (Eng), senior lecturer managing chair, expert in mehano-chemical synthesis and research of polymeric mixes and composit polymeric materials on their basis, updating of structure and properties of polymeric mixes. E-mail: yunis1m@yahoo.com.
Chernyavskaya Nina — A.N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences (119991, GSP-1, Moscow, 119334, Vavilov street 28), PhD (Chem), senior scientific employee, expert in the field of synthesis and research of organosilicone connections. E-mail: ninon635@mail.ru.
Mammadli Ulviya Mammadhuseyn — Institute of polymeric materials National Academy of sciences of Azerbaijan (AZ5004, Sumgait, S.Vurguna street, 124), PhD (Chem), senior lecturer, senior scientific employee of laboratory, expert in the field of mehano-chemical synthesis and research of polymeric composit materials. E-mail: ulviyyam@mail.ru.
Reference citing
Kurbanova R. V., Kakhramanov N. T., Muzafarov A. M., Gahramanly Y. N., Chernyavskaya N. A., Mammadli U. M. Mekhano-himicheskij sintez i issledovanie gibridnyh nanokompozitov na osnove polipropilena i kaolina [Mechano-chemical synthesis and study of hybrid nanocomposite on polypropylene and kaolin base]. Perspektivnye Materialy — Advanced Materials (in Russ), 2018, no. 4, pp. 40 – 48.
DOI: 10.30791/1028-978X-2018-4-40-48
Thermal stability of structure and properties of instrumental steel surface layer alloyed by zirconium and silicon atoms under the action of compression plasma flows
N. N. Cherenda, V. V. Uglov, S. V. Gusakova,
V. M. Astashynski, A. M. Kuzmitski
Phase and element composition, microhardness of instrumental steel with Zr and Si coatings after the action of compression plasma flows and thermal treatment in air were investigated in this work. The findings showed that plasma impact lead to formation of the surface steel layer with the thickness of up to ~ 8.5 μm alloyed with zirconium and silicon atoms and containing Fe2Zr intermetallide. Formation of g-ZrO2 and Zr(C,N) at the surface due to interaction with the residual atmosphere of vacuum chamber was found. The change of phase composition and quenching effects resulted in twofold microhardness increase. Alloyed layer phase composition and structure are stable (except of polymorphic transition in ZrO2) up to the temperature of 400 °С. Annealing at the temperature of 600 °C lead to the internal oxidation accompanied with formation of iron oxide scale at the surface and oxygen atoms penetration at a whole depth of the alloyed layer. Microhardness decrease in the bulk of the alloyed layer occurs with the growth of the annealing temperature.
Keywords: steel, compression plasma flows, phase composition, corrosion resistance, microhardness.
Cherenda Nikolai — Belarusian State University (220030 Minsk, Nezavisimosti ave.,4, Republic of Belarus), associate professor, Physics Faculty, Department of Solid State Physics, PhD, specialist in the field of interaction of ion and plasma beams with matter and radiation materials science. E-mail: сherenda@bsu.by; National Research Tomsk Polytechnical University, Institute of High Technology Physics (Tomsk, Lenin ave., 2/4 Russia), senior researcher.
Uglov Vladimir — Belarusian State University, (220030 Minsk, Nezavisimosti ave.,4, Republic of Belarus), head of department of Solid State Physics, professor, Physics Faculty, Dr Sci., specialist in the field of interaction of ion and plasma beams with matter, protective coatings and radiation materials science. E-mail: uglov@bsu.by; National Research Tomsk Polytechnical University,Institute of High Technology Physics (Tomsk, Lenin ave., 2(4) Russia), leading researcher.
Gusakova Sofia — Belarusian State University, Physics Faculty, Department of Solid State Physics (220030 Minsk, Nezavisimosti ave.,4, Republic of Belarus), leading engineer on the radiation and vacuum installation, PhD, specialist in the field of high speed crystallization of metals and scanning electron microscopy. E-mail: husakova@bsu.by.
Astashynski Valentin — A.V. Luikov Heat and Mass Transfer Institute of the National Academy of Sciences of Belarus (220072 Minsk, P.Brovka str., 15, Minsk, Belarus), deputy director, Dr Sci., specialist in the field of plasma physics and plasma accelerators. E-mail: ast@hmti.ac.by.
Kuzmitski Anton — A.V. Luikov Heat and Mass Transfer Institute of the National Academy of Sciences of Belarus (220072 Minsk, P.Brovka str., 15, Minsk, Belarus), seniour scientist, PhD, specialist in the filed of plasma physics and plasma accelerators. E-mail: antey@hmti.ac.by.
Reference citing
Cherenda N. N., Uglov V. V., Gusakova S. V., Astashynski V. M., Kuzmitski A. M. Termicheskaya stabil'nost' struktury i svojstv poverhnostnogo sloya instrumental'noj stali, legirovannogo atomami cirkoniya i kremniya pod dejstviem kompressionnyh plazmennyh potokov [Thermal stability of structure and properties of instrumental steel surface layer alloyed by zirconium and silicon atoms under the action of compression plasma flows]. Perspektivnye Materialy — Advanced Materials (in Russ), 2018, no. 4, pp. 49 – 59.
DOI: 10.30791/1028-978X-2018-4-49-59
Dielectric properties of multilayer optically transparent TiO2-nanosilver coating on polyester substrate obtained by solvent method
O. I. Davydova, T. V. Gerasimova, E. P. Grishina, O. L. Evdokimova, K. V. Ivanov, A. S. Kraev, A. V. Agafonov
Thin functional, optically active TiO2, TiO2/Ag and TiO2/Ag/TiO2 films on a polyethylene terephthalate substrate were obtained by a layer-by-layer deposition method from colloidal solutions. The film-forming TiO2 sol was obtained by sol-gel method. Silver coating was deposited from an aqueous solution of silver nitrate followed by its photolysis in a film. The physicochemical and dielectric properties of the obtained coatings were studied depending on the number and order of alternation of the deposited layers. It was found that the dielectric spectrum of TiO2, TiO2/Ag and TiO2/Ag/TiO2 films is similar to the dielectric characteristic of ceramic samples of titania in anatase and rutile phases and characterized by the presence of a relaxation maximum. The maximum position and its intensity depends on the type of alternating layers of the film, the frequency and the magnitude of the measuring voltage, respectively.
Keywords: photoactive thin TiO2 films, silver, layer-by-layer deposition, colloid systems, solutions, flexible substrate, dielectric properties, optical characteristics.
Davydova Olga — G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences (Akademicheskaya St.,1, Ivanovo, Russia 153045), PhD, Senior researcher, specialist in the field of obtaining nanomaterials by sol-gel method. E-mail: olgaivdav@mail.ru.
Gerasimova Tatyana — G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences (Akademicheskaya St.,1, Ivanovo, Russia 153045), PhD, Junior researcher, specialist in the field of obtaining nanomaterials by sol-gel method. E-mail: t_v_gerasimova@mail.ru.
Grishina Elena — G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences (Akademicheskaya St.,1, Ivanovo, Russia 153045), Dr.Sci., Chief researcher, specialist in the field of the electrochemistry. E-mail: epg@isc-ras.ru.
Evdokimova Olga — G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences (Akademicheskaya St.,1, Ivanovo, Russia 153045), PhD, Junior researcher, specialist in the field of obtaining nanomaterials by sol-gel method. E-mail: olga_evdokimova@outlook.com.
Ivanov Konstantin — G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences (Akademicheskaya St.,1, Ivanovo, Russia 153045), PhD, researcher, specialist in the field of the investigation of rheological and dielectric properties of nanomaterials. E-mail: ivk@isc-ras.ru.
Kraev Anton — G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences (Akademicheskaya St.,1, Ivanovo, Russia 153045), researcher, specialist in the field of the investigation of rheological and dielectric properties of nanomaterials. E-mail: ask@isc-ras.ru.
Agafonov Alexander — G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences (Akademicheskaya St.,1, Ivanovo, Russia 153045), Dr.Sci., head of laboratory, specialist in design and development of solution methods for nanostructures preparation and their adaptation to modern technology. E-mail: ava@isc-ras.ru.
Reference citing
Davydova O. I., Gerasimova T. V., Grishina E. P., Evdokimova O. L., Ivanov K. V., Kraev A. S., Agafonov A. V. Diehlektricheskie svojstva mnogoslojnogo, opticheski prozrachnogo pokrytiya dioksid titana – nanoserebro na poliehfirnoj podlozhke, poluchennogo rastvornym metodom [Dielectric properties of multilayer optically transparent TiO2-nanosilver coating on polyester substrate obtained by solvent method]. Perspektivnye Materialy — Advanced Materials (in Russ), 2018, no. 4, pp. 60 – 67.
DOI: 10.30791/1028-978X-2018-4-60-67
Preparation of dispersed mesoporous powders
in the system Al2O3 – ZrO2 (Y2O3)
for the catalyst carrier
L. V. Morozova, I. A. Drozdova, T. V. Khamova, I. G. Polyakova
The liquid-phase synthesis technology for production of the dispersed and mesoporous powders in the system Al2O3 − ZrO2 (Y2O3) was developed. It is shown that the use of cryogenically processing allows to limit the agglomeration of particles and to obtain the precursors with a specific surface area more than 100 m2/g and a pore volume in the range 0.18 − 0.51 cm3/g. The influence of source of the oxide alumina on the dispersion and the pore structure of the powders was revealed, this fact gives the possibility to manage the texture characteristics. It is established that synthesized compositions are two-phase (g-Al2O3 + t-ZrO2), the sizes of the phases does not exceed 45 nm. Heat treatment of two-phase compositions in the system Al2O3 − ZrO2 (Y2O3) with 700 °С for 50 h preserves nanorazmernoi phases (< 60 nm) and practically does not change the crystalline structure. The experimental results presented in this work allow to recommend materials received as the powders-precursors for catalysts carried in the conversion of methane to synthesis-gas.
Key words: liquid-phase synthesis, cryogenically processing, xerogels, nanocomposites, specific surface area, mesopores.
Morozova Ludmila — Grebenshchikov Institute of Silicate Chemistry of RAS (Makarov emb. 2, St.-Petersburg, 199155 Russia), Ph.D., senior researcher, specialists in the field of physical chemistry and methods of synthesis of oxide nanomaterials. E-mail: morozova_l_v@mail.ru.
Drozdova Irina — Grebenshchikov Institute of Silicate Chemistry of RAS (Makarov emb. 2, St.-Petersburg, 199155 Russia), senior researcher, specialists in the field of electron spectroscopy of oxide materials. E-mail: i-drozd@list.ru.
Khamova Tamara — Grebenshchikov Institute of Silicate Chemistry of RAS (Makarov emb. 2, St.-Petersburg, 199155 Russia), Ph.D., senior researcher, specialists in the field of technology of nanocomposite glass-ceramic materials.
Polyakova Irina — Grebenshchikov Institute of Silicate Chemistry of RAS (Makarov emb. 2, St.-Petersburg, 199155 Russia), senior researcher, specialist in X-ray diffraction analysis of oxide compounds. E-mail: ira_pp@list.ru.
Reference citing
Morozova L. V., Drozdova I. A., Khamova T. V., Polyakova I. G. Poluchenie dispersnyh mezoporistyh poroshkov v sisteme Al2O3 – ZrO2 (Y2O3) dlya nositelej katalizatorov
[Preparation of dispersed mesoporous powders in the system Al2O3 – ZrO2 (Y2O3) for the catalyst carrier]. Perspektivnye Materialy — Advanced Materials (in Russ), 2018, no. 4, pp. 68 – 77.
DOI: 10.30791/1028-978X-2018-4-68-77
