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Optical properties of endohedral Li@C60
A. Gromov,N. Krawez,A. Lassesson,D. I. Ostrovskii,E. E. B. Campbell 한국물리학회 2002 Current Applied Physics Vol.2 No.1
UV-VIS, IR and Raman investigations have been carried out on puried Li@C60 produced by low energy ion implantation ofC60. Two endohedral fractions can be isolated that have very dierent optical properties and stabilities. Here we show that the rstendohedral fraction is a dimer species and the second fraction is the monomer. The IR spectra of sublimed monomer lms show aprominent peak at around 1.1l m corresponding to the rst electronic transition of the C.60 anion. Raman spectra show the vib-rationalrotational movement of the Li inside the carbon cage.. 2002 Elsevier Science B.V. All rights reserved.
Adsorption Materials and Processes for Carbon Capture from Gas-Fired Power Plants: AMPGas
Gibson, J. A. Arran,Mangano, Enzo,Shiko, Elenica,Greenaway, Alex G.,Gromov, Andrei V.,Lozinska, Magdalena M.,Friedrich, Daniel,Campbell, Eleanor E. B.,Wright, Paul A.,Brandani, Stefano American Chemical Society 2016 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.55 No.13
<P>The key challenge in postcombustion capture from gas-fired power plants is related to the low CO2 concentration in the flue gas (4-8% by volume). This means that conventional amine processes will result in a relatively high energy penalty, whereas novel adsorbents and adsorption processes have the potential to improve the efficiency of separation. High-selectivity adsorbents are required to achieve relatively high CO2 uptake at low partial pressures, which means that the separation process should be based on either very strong physisorption or chemisorption with thermal regeneration. From the process point of view, the main challenge is to develop efficient separation processes with rapid thermal cycles. In this report we present a detailed overview of the methodology behind the development of novel materials and processes as part of the 'Adsorption Materials and Processes for Gas-fired power plants' (AMPGas) project. Examples from a wide variety of materials tested are presented, and the design of an innovative bench-scale 12-column rotary wheel adsorber system is discussed. The strategy to design, characterize, and test novel materials (zeolites, amine-containing MOFs, amine-based silicas, amine-based activated carbons, and carbon nanotubes), specifically designed for CO2 capture from dilute streams is presented.</P>
ELECTRONIC PROPERTIES OF THIN FILMS SUBLIMED FROM La@C82 AND Li@C60
V.N. POPOK,A.V. GROMOV,M. JÖNSSON,A. TANINAKA,H. SHINOHARA,E.E.B. CAMPBELL 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2008 NANO Vol.3 No.3
La@C82 and Li@C60 thin films obtained by sublimation in vacuum are studied using four-probe current–voltage measurements and atomic force microscopy. In situ electrical measurements show semiconducting behavior of both films with room-temperature resistivity of 21±8 and 1230±50Ω· cm for the La@C82 and Li@C60, respectively. A variable range hopping mechanism of conductance is suggested from the temperature dependences of resistance. The activation energies for electron transport are calculated for both metallofullerenes. Irreversible changes to the Li@C60 film structure increasing the film resistivity to values typical for C60 are found at elevated temperatures. The effect of exposure to ambient atmosphere on the conductance of the films is discussed.
Anton Yu. Nalivaiko,Dmitriy Yu. Ozherelkov,Ivan A. Pelevin,Stanislav V. Chernyshikhin,Andrey E. Medvedev,Andrey V. Korshunov,Alexey N. Arnautov,Alexander A. Gromov 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.3
The synthesis features for 3D samples of AlSi10MgCualloy were investigated. Two types of samples were used: single tracksand cubic samples of 10 mm3volumes obtained by selective laser melting. 3D printing regimes and samples characteristicswere compared for both types of samples. A comprehensive characterization of the initial AlSi10MgCualloy powder wasperformed. The morphology, microstructure, and micro-hardness of the obtained single tracks and cubic samples werestudied. The mechanism of the porosity formation was discussed in detail. A formation of pores and non–uniform structureswas evidently caused by non–equilibrium crystallization during the selective laser melting process, namely 3D samples fastcooling. The lower porosity and the more uniform structure were obtained with higher values of laser power (from 220 to240 W) Values of laser power had a crucial influence on the morphology and microstructure of the obtained 3D material. Optimal modes for selective laser melting for experimental AlSi10MgCupowder were revealed based on the microstructureand micro-hardness data. The values of the micro-hardness were varied from 115.5 to 151.1 HV. The micro-hardness forsamples was increased on average by 20 HV after additional heat treatment. It was caused, most probably, by the separationof the Al2Cuphase.
Kwon, Young-Soon,Kim, Ji-Soon,A. Gromov, Alexander,Hong, Moon-Hee The Korean Powder Metallurgy Institute 2004 한국분말재료학회지 (KPMI) Vol.11 No.2
The passivation and oxidation process of tungsten and molybdenum narlopowders, produced by electrical explosion of wires was studied by means of FE-SEM, XPS. XRD, TEM, DIA-TGA and sire distribution analysis. In addition, the phase transformation of W and Mo nanopowders under oxidation in air was investigated. A chemical process is suggested for the oxidation of W and Mo nano-particles after a comprehensive testing of passivated and oxidized powders.