Уважаемые коллеги!Благодарим Вас за проявленный интерес к Четвертой российской конференции «Графен: молекула и 2D кристалл» и желание принять участие в её работе.Конференция проходит в научно-образовательном центре города Новосибирска -Академгородке.Мероприятие посвящено актуальным направлениям исследований и разработок в области углеродных и низкоразмерных материалов.Проведение конференции поможет координации усилий ученых в решении современных проблем материаловедения и привлечению молодых исследователей для решения актуальных научных задач.Оргкомитет выражает особую благодарность НГУ, Центру компетенций НТИ «Моделирование и разработка новых функциональных материалов с заданными свойствами», компаниям «Диаэм», «НТ-МДТ Спектрум Инструментс» и корпорации "Графеновая Долина" за финансовую поддержку и журналам Аналитика, Наноиндустрия и РЭНСИТ за информационную поддержку.Искренне надеемся, что пребывание в Новосибирском Академгородке и в стенах Новосибирского государственного университета оставит множество положительных эмоций и

A method for leaching Co2Al9 alloy was developed and optimized to produce nonpyrophoric Raney cobalt, which is used as a component of a highly efficient granular Fischer-Tropsch synthesis catalyst. A comparative study of the laboratory-produced Raney cobalt with commercially available analog was done using the methods of low-temperature nitrogen sorption, thermoprogrammed reduction (TPR), thermoprogrammed ammonia desorption, thermal analysis, thermal conductivity, and scanning and transmission electron microscopy. Partial dissolution of cobalt with the formation of Co2+ and Co3+ ions was detected during aluminum leaching. It was found that incomplete purification of commercial Raney cobalt from aluminum hydroxide impurity may lead to overestimation of specific surface area. It was also found that the acidity of the molded catalyst is mainly determined not by Raney cobalt, but by elements of the composite catalyst carrier. For the first time, a linear dependence between the content of structures in a Fischer-Tropsch synthesis catalyst with TPR-AR maxima of 500-800 degrees C and the amount of synthesized liquid hydrocarbons has been established. It is concluded that metal nanoparticles with partial charge transfer (Co delta+) are active centers of selective formation of C5+ hydrocarbons. Obtaining the maximum number of these centers and reaching a high thermal conductivity of the composite with a developed system of transport pores is a criterion for creating an effective cobalt catalyst for low-temperature synthesis of hydrocarbons.

Уважаемые коллеги!Благодарим Вас за проявленный интерес к Четвертой российской конференции «Графен: молекула и 2D кристалл» и желание принять участие в её работе.Конференция проходит в научно-образовательном центре города Новосибирска -Академгородке.Мероприятие посвящено актуальным направлениям исследований и разработок в области углеродных и низкоразмерных материалов.Проведение конференции поможет координации усилий ученых в решении современных проблем материаловедения и привлечению молодых исследователей для решения актуальных научных задач.Оргкомитет выражает особую благодарность НГУ, Центру компетенций НТИ «Моделирование и разработка новых функциональных материалов с заданными свойствами», компаниям «Диаэм», «НТ-МДТ Спектрум Инструментс» и корпорации "Графеновая Долина" за финансовую поддержку и журналам Аналитика, Наноиндустрия и РЭНСИТ за информационную поддержку.Искренне надеемся, что пребывание в Новосибирском Академгородке и в стенах Новосибирского государственного университета оставит множество положительных эмоций и

Microwave absorption properties are studied for flexible materials based on periodic gratings made of carbon nanotube (CNT) threads. Resonant absorption is observed by free space measurements in the frequency range from 26.5 to 40 GHz. Materials comprised of CNT thread gratings with different periods, a metal backplate, and an intermediate dielectric layer exhibit significant reflection losses (less than -45 dB). The shifts of peaks on the absorption spectra caused by changes in the thickness and rotations of the samples indicate the high sensitivity of the obtained results.

Catalytic synthesis of carbon nanotubes (CNT) produces numerous various byproducts such as soot, graphite platelets, catalyst nanoparticles, etc. Identification of the byproduct formation mechanisms would help develop routes to more selective synthesis of better carbon-based materials. This work reports on the identification of the formation zone and conditions for rather unusual closed multishell carbon nanocapsules in a reactor for float-catalysis synthesis of longer CNT. Structural investigation of the formed nanocapsule material along with computational fluid dynamics (CFD) simulations of the reactor suggested a nanocapsule formation mechanism, in which CNT embryos are suppressed in growth by the in-reactor turbulence. By means of TEM and FFT investigation, it is found that differently oriented single crystals of γ–Fe2O3, which do not have clear connections with each other, determine a spherical surface. The carbon atoms that seep through these joints do not form crystalline graphite layers. The resulting additional product in the form of graphene-coated (γ–Fe/Fe3C)/γ–Fe2O3 nanoparticles can be a lightweight and effective microwave absorber.

This paper presents the graphite-based paste, within which an exfoliated graphite as the main electrically conductive component was selected. The resulting graphite-based paste is a ho-mogenous polyvinyl chloride mixture containing carbon materials with different particle sizes (such as gas soot and microcrystalline graphite). The preparation of electrical conductivity graph-ite-based paste and electrode sample based on it and obtained by means of screen printing technol-ogy. The purpose of electrode properties exploration is to elucidate its applicability as a main com-ponent of electrochemistry biosensor for glucose concentration measurements in blood. The results of a comparative analysis of printed electrodes based on it with electrodes made of commercial graphite paste from one of the world's leading manufacturers (Gwent Electronic Materials) are presented. The obtained electrodes were characterized by comparable physical and electrochemical parameters. According to the results of scanning electron microscopy of electrodes, graphite paste with exfoliated graphite is suitable for screen printing. The electrical resistivity of the electrodes with exfoliated graphite was 440 (Ohms center dot mm2)/m, and the electrodes obtained on the basis of com-mercial paste - 270 (Ohms center dot mm2)/m. The biosensor, made on the basis of the original graphite paste, is characterized by a wide range of linearity of response to glucose in the range from 1 to 40 mM, and similar values of currents and sensitivity compared to a commercial analogue. The results of studies of the obtained electrodes have shown that exfoliated graphite is a promising material for use in electrochemical systems, and reducing the concentration of carbon conductive components can significantly reduce the cost of finished graphite paste and increase its commercial potential.

In this work, several ways to decrease the deactivation degree were proposed. To prevent local overheating, exfoliated graphite was used as a heat-conductive additive in catalyst composition. To decrease the deposition of heavy waxes, H-Beta zeolite was used for secondary reactions intensification and decreasing hydrocarbons chain length in the product. In this work, pelletized zeolite-containing cobalt catalyst with exfoliated graphite as a heat-conductive additive was investigated. The test run was 2200 h long and included continuous synthesis in a 6-meter high pilot reactor. The deactivation degree after 2200 h of the test run was 13%. The investigation of catalyst samples after synthesis by means of scanning electron microscopy showed that heavy hydrocarbons did not block the pore structure of catalytic pellets. Deactivation of cobalt catalyst was decelerated seriously due to zeolite-induced decrease in molecular weight of formed hydrocarbons. Investigation of catalysts before and after the test by means of transmission electron microscopy and X-ray diffraction analysis showed an increase in the size of clusters by 3-5 times, which is another important cause for catalyst deactivation. As a result, it was found that investigated cobalt catalyst for Fisher-Tropsch synthesis has a low deactivation rate. Its implementation in the industry can help gaining better economic performance for the synthetic fuel production process.

Carbon fibers (CF) were formed from carbon nanotube-doped isotropic petroleum pitch. Ultra-long (the length of a single filament is more than 10,000 nm) double-walled carbon nanotubes (DWCNT) were used for doping in concentrations from 0.1 to 1.0 wt.%. The produced CF were investigated both in pristine and graphitized form. Physical properties (electrical resistivity, thermal conductivity coefficient), as well as X-ray diffraction (XRD) analysis and Raman spectroscopy of obtained DWCNT-doped CF were investigated. The influence of DWCNT concentration on the properties is nonlinear due to the influence on the CF molding mode and heterogeneity of the DWCNT distribution in the filament body. An increase in the DWCNT concentration, on the one hand, causes an enhancement in the thermal conductivity coefficient, and a decrease in the electrical resistivity of the fibers, on the other hand, it leads to local inhomogeneities formation in the material structure («gas bubbles»), as well as distortions of the CF outer surface. An increase in the DWCNT concentration also leads to an increase in CF average diameter and hollow filaments formation. This feature is paving the way to the development of novel technological methods to control CF properties and morphology, especially to feasible hollow CF composites manufacture.

In this paper, the influence of carbon components in the composition of graphite paste on the electrical resistivity of a screen-printed carbon electrode is investigated. Graphite pastes with different contents of thermally expanded graphite (4.5–7.0 wt %), fine-grained graphite (0–6 wt %) and carbon black (0–12 wt %) are investigated. The creation of a polydisperse conducting system requires the application of carbon materials with different physical properties and particle sizes. This will lead to improvement in the screen-printing quality and reduce the resistivity of screen-printed carbon electrodes.

The structural and physical properties of onion-like carbon obtained in the process of partial oxidation of natural gas at different O-2/CH4 molar ratios were studied. It is established that when the molar oxygen/natural gas ratio increases from 0.650 to 0.750, the thermal stability limit of onion-like carbon increases from 520 to 620 degrees C. In an onion-like carbon sample obtained at a molar ratio of oxygen/natural gas of 0.750 in the temperature range from 680 to 750 degrees C, the presence of an oxidation- resistant carbon phase is observed. The interplanar spacing (d002) in the resulting onion-like carbon is 0.341 nm. Traces of trans-polyacetylene were detected by means of Raman spectroscopy at a Raman shift of 1164 cm(-1) in onion-like carbon. A paired peak was also detected at a Raman shift of 1480 cm(-1) as a result of the spectrum deconvolution. However, in the samples synthesized at temperatures higher than 1550 degrees C, no traces of trans-polyacetylene were detected. Heat treatment of the onion-like carbon in air at 320 degrees C leads to almost complete removal of these impurities. The ratio of peak intensities of ID/IG increases from 0.815 to 0.849 with an increase in the oxygen concentration in the raw mixture according to Raman spectroscopy data. The diffraction pattern of onion-like carbon corresponds to a defective graphitic structure, while its specific surface area varies from 80 to 100 m(2)/g. The production of onion-like carbon in the process of partial oxidation of natural gas can provide a high yield of the product at a low cost, while simultaneously producing synthesis gas of the necessary composition for "downstream" processes.

The effect of the dilution of a synthesis gas with nitrogen on the activity, selectivity and productivity of a Fischer–Tropsch reactor with a fixed bed of granular catalyst during synthesis on a pilot plant of a full cycle for the conversion of natural gas into synthetic oil is studied experimentally. Experimental data are presented that were obtained at different contents of nitrogen in the synthesis gas: up to 2, 50, and 70%. Analysis of the experimental data shows that diluting the synthesis gas contributes to an increase in the selectivity to C5+, and a decrease in the selectivity to methane. A drop in the reactor’s productivity observed upon the dilution of synthesis gas can be compensated for by increasing the consumption of synthesis gas. The negative effect of decrease in the pressure of FT synthesis from 2 to 1.5 and 1.0 MPa on the catalytic FT synthesis performed on a twice-diluted synthesis gas at a synthesis gas space velocity of 4000 h–1 is demonstrated.

Epoxy nanocomposites with float catalysis-produced CNT felt as a filler were prepared. Parameters such as the curing process, glass transition of epoxynanocomposites, structure and morphology of CNT felt, initial epoxy composition, and epoxy nanocomposites were investigated. The influence of CNT felt on curing process in epoxy nanocomposites with different amounts of curing agent was determined. An exothermic reaction between the curing agent and the surface of CNTs was established. It was found that the structure of epoxy nanocomposites has a high degree of heterogeneity: the presence of fiber-like structures and individualized CNTs is observed together with the regions that are typical for CNTs that are fabricated via a catalytic chemical vapor deposition (CVD). Based on the studies performed, it is possible to predict the production of epoxy nanocomposites with outstanding mechanical and thermophysical properties. In particular, the uncured compositions already obtained in this work can be used for the manufacture of electrically conductive glass and carbon fiber reinforced plastics and functional coatings.

The paper reports the synthesis of carbon nanotubes from ethanol over group VIII (Fe, Co, Ni) catalysts derived from corresponding metallocenes. Several unexpected cooperative effects are reported, which are never observed in the case of individual metallocenes such as the commonly used ferrocene catalyst Fe(C5H5)2. The formation of very long (up to several µm) straight monocrystal metal kernels inside the carbon nanotubes was the most interesting effect. The use of trimetal catalysts (Fe1-x-yCoxNiy)(C5H5)2 resulted in the sharp increase in the yield of carbon nanotubes. The electrical conductivity of the produced nanotubes is determined by the nature of the catalyst. The variation of individual metals in the Ni-Co-Fe leads to a drop of the electrical resistivity of nanotube samples by the order of magnitude, i.e., from 1.0 × 10−3 to 1.1 × 10−5 Ω∙m. A controlled change in the electrophysical properties of the nanotubes can make it possible to expand their use as fillers in composites, photothermal and tunable magnetic nanomaterials with pre-designed electrical conductivity and other electromagnetic properties.

Onion-like carbon (OLC) was investigated at high pressure (up to 48 GPa) in a shear diamond anvil cell (SDAC) equipped with in-situ Raman spectroscopy control. The OLC was obtained from natural gas by a highly productive and efficient partial oxidation method. Vast bulk modulus B-0 = 486 +/- 15 GPa and outstanding stability under high pressure were registered in the experiment. A phase transition was observed at 20 GPa under conditions of shear deformation. The transition is characterized by an appearance of a new Raman band at 1560 cm(-1) accompanied with disappearance of G band of OLC. We attribute these features to sp(2)-sp(3) transition in the carbon nanoclusters. It was found however that the concentric multi-shell onion-like structure remains intact after pressure release, which may witness that the outer shell of the OLC serves as a confinement and prevents structural collapse. X-ray photoelectron spectroscopy revealed however that the phase transition was not completely reversible because the OLC after pressure release showed the presence of sp(3)-hybridized carbon in significant amounts.

Aerosol synthesis of carbon nanotubes from ethanol in the presence of metallocenederived catalysts (group VIII (Fe, Co, Ni) metallocenes were employed) is reported. It was established that the use of complex metallocene catalysts based on several different metallocenes leads to unexpected cooperative effects, which are not observed in case of individual metallocenes especially in case of a commonly used ferrocene catalyst Fe(C5H5)(2). The yield of carbon nanotubes was almost doubled at certain values of Fe/Co/Ni ratio as compared with pure Fe catalyst. The formation of straight monocrystal metal kernels inside the carbon nanotubes was the most interesting effect. The longest Ni kernels grew more than 1500 nm long. The electrical conductivity of carbon nanotubes depends strongly on the nature of the catalyst. The variation of individual metals in the Ni-Co-Fe range or increase in the content of active Fe in Fe-Ni, Fe-Co, Fe-Co-Ni mixtures leads to an increase in the conductivity of nanotube samples by the order of magnitude, i.e. from 1.2.10(2) to 9.4.10(4) s/m. A controlled change in the electrophysical properties of the nanotubes can make it possible to expand their use as fillers in composites, photothermal and tunable magnetic nanomaterials with pre-designed electrical conductivity and other electromagnetic properties.

A method for producing skeletal cobalt (Raney cobalt) for the use in highly efficient granular Fischer-Tropsch synthesis catalysts with high performance for C5+ liquid hydrocarbons is presented. The proposed method makes it possible to obtain skeletal cobalt in a relatively simple, reproducible method and in a safe, non-pyrophoric form of ultrafine powder. Skeletal cobalt, along with additional additives introduced into the composite, can provide the implementation of the percolation network necessary for heat transfer and the optimized porous structure of the catalyst. The obtained Raney cobalt is characterized by a number of physical and chemical methods with the development of process control parameters for the production of Raney cobalt. It is shown by transmission electron microscopy that the Raney cobalt particles, which look like monoliths in low-resolution micrographs, consist of weakly interconnected nanoparticles. In the production of a porous metal, a partial dissolution of cobalt with the formation of divalent Co2+ due to oxidation by water and further transition to colored Co3+ in the interaction with dissolved air oxygen was found, which was not previously discussed in the literature on the production of Raney metals. The introduction of skeletal cobalt in an amount of up to 3% wt. in the composition of the Fischer-Tropsch synthesis catalyst leads to a significant increase in the performance of the catalyst, up to 410 g/l/h compared to the value of 320-340 g/l/h for the initial catalyst. It is also shown that the intrinsic acidity of reduced cobalt is sufficiently low and the main contribution to the acidity of the catalyst is made by impurity aluminum oxide structures or other elements of the composite catalyst carrier.