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1.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gokhfeld D. M., Savitskaya N. E., Popkov S. I., Kuzmichev N. D., Vasyutin M. A., Balaev D. A.
Заглавие : Anisotropic magnetization of an NbN film
Место публикации : J. Exp. Theor. Phys. - 2022. - Vol. 134, Is. 6. - P.707-712. - ISSN 10637761 (ISSN), DOI 10.1134/S1063776122060097
Примечания : Cited References: 31. - We are grateful to I.V. Nemtsev for measurements on the scanning electron microscope, S.A. Skorobogatov for his help in magnetic measurements (scanning electron microscopy and magnetic measurements have been performed at the Krasnoyarsk Regional Collective Usage Center of the Federal Research Center “Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences”)
Аннотация: The structural and magnetic properties of a niobium nitride (NbN) film prepared by reactive sputtering onto a quartz substrate are investigated. It is shown using scanning electron microscopy that the film has a columnar structure with a diameter of crystallite columns of about 50 nm. The film magnetization loops are measured for the field orientation parallel and perpendicular to its surface. Based on the experimental data, the critical current densities of the film are estimated in both cases. For the field parallel to the film surface, the estimate is 6.5 × 104 A/cm2 at the liquid helium temperature. For the field perpendicular to the surface, the critical current density is close to the depairing current density (107 A/cm2). Analysis of the results based on different models of magnetic vortex pinning in superconductors shows that in the former case, pinning occurs at the boundaries of columns in the bulk of the sample, while in the latter case, it is determined by the influence of the surface barrier.
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2.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Avramov P. V., Yakobson B. I., Scuseria G. E.
Заглавие : Mechanisms of inelastic scattering of low-energy protons by C6H6, C-60, C6F12, and C60F48 molecules
Разночтения заглавия :авие SCOPUS: Mechanisms of inelastic scattering of low-energy protons by C 6H6, C60, C6F12, and C60F48 molecules
Место публикации : Phys. Solid State: SPRINGER, 2006. - Vol. 48, Is. 1. - P177-184. - ISSN 1063-7834, DOI 10.1134/S106378340601032X
Примечания : Cited References: 23
Предметные рубрики: DYNAMICS SIMULATIONS
FULLERENES
COMPLEXES
BUCKMINSTERFULLERENE
HELIUM
ATOMS
Аннотация: The mechanisms of inelastic scattering of low-energy protons with a kinetic energy of 2-7 eV by C6H6, C6F12, C-60, and C60F48 molecules are studied using the methods of quantum chemistry and nonempirical molecular dynamics. It is shown that, for the C6H6 + proton and C-60 + proton systems, starting from a distance of 6 angstrom from the carbon skeleton, the electronic charge transfer from the aromatic molecule to H+ occurs with a probability close to unity and transforms the H+ ion into a hydrogen atom and the neutral C6H6 and C-60 molecules into cation radicals. The mechanism of interaction of low-energy protons with C6F12 and C60F48 molecules has a substantially different character and can be considered qualitatively as the interaction between a neutral molecule and a point charge. The Coulomb perturbation of the system arising from the interaction of the noncompensated proton charge with the Mulliken charges of fluorine atoms results in an inversion of the energies of the electronic states localized, on the one hand, on the positively charged hydrogen ion and, on the other hand, on the C6F12 and C60F48 molecules. As a result, the neutral molecule + proton state becomes the ground state. In turn, this inversion makes the electronic charge transfer energetically unfavorable. Quantum-chemical and molecular-dynamics calculations on different levels of theory showed that, for fluorine derivatives of some aromatic structures (C6F12, C60F48), the barriers to proton penetration through carbon hexagons are two to four times lower than for the corresponding parent systems (C6H6, C-60). This effect is explained by the absence of active pi-electrons in the case of fluorinated molecules.
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3.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Berman G. P., Kolovsky A. R., Zaslavsky G. M.
Заглавие : A non-linear resonance in a system of surface-state electrons bound to the helium surface
Место публикации : Phys. Lett. A. - 1984. - Vol. 105, Is. 9. - P.483-486. - ISSN 0375-9601, DOI 10.1016/0375-9601(84)91042-9
Примечания : Cited References: 24
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4.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Dudnik A. I., Osipova I. V., Nikolaev N. S., Churilov G. N.
Заглавие : Comparative analysis of two methods for synthesis of fullerenes at different helium pressures
Коллективы : RFBRRussian Foundation for Basic Research (RFBR) [18-32-20011]
Место публикации : Fuller. Nanotub. Carbon Nanostruct. - 2020. - Vol. 28, Is. 9. - P.697-701. - ISSN 1536-383X, DOI 10.1080/1536383X.2020.1746281. - ISSN 1536-4046(eISSN)
Примечания : Cited References: 16. - The reported study was funded by RFBR according to the research project No 18-32-20011
Предметные рубрики: PLASMA
YIELD
DISCHARGE
PARAMETERS
DEPENDENCE
C60
Аннотация: The results of the effect of helium pressure in the chamber on the amount and composition of the produced fullerenes (C60, C70, etc.) synthesized in the arc plasma with graphite electrodes are presented. The findings obtained when the arc is powered by a direct (DC) and alternating (AC) currents of low frequency were compared in the same chamber with the electrodes located at the same angle to each other. These two methods are drastically different. The complete conversion of graphite into fullerene soot in AC occurs, but a part of the graphite is converted into a cathode deposit that does not contain fullerenes in DC, the relative amount of which increases when decreasing the helium pressure in the chamber. The highest fullerene content in fullerene soot of 10.2 wt.% is produced at a pressure of 127.5 kPa in AC arc, but in DC arc, the highest content of fullerenes in fullerene soot of 8.3 wt.% is produced at a pressure of 33.3 kPa.
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5.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Churilov G. N., Kostinevich E. M., Marchenko S. A., Glushchenko G. A., Bulina N. V., Zaitsev A. I., Vnukova N. G.
Заглавие : Hydrogen sorption by carbon-based substances formed in carbon-helium plasma
Место публикации : Tech. Phys. Lett.: AMER INST PHYSICS, 2005. - Vol. 31, Is. 3. - P233-234. - ISSN 1063-7850, DOI 10.1134/1.1894442
Примечания : Cited References: 7
Аннотация: Hydrogen sorption by various carbonaceous products formed during arc discharge in carbon-helium plasma has been studied. The main product fractions included a fullerene-containing soot, a fullerene mixture extract, a condensate containing carbon nanotubes, and carbonized aluminum oxide. Molecular hydrogen is most effectively sorbed by single-wall carbon nanotubes contained in the carbon condensate fraction. (C) 2005 Pleiades Publishing, Inc.
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6.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Churilov G. N., Osipova I. V., Tomashevich Y. V., Glushchenko G. A., Fedorov A. S., Popov Z. I., Bulina N. V., Vereshchagin S. N., Zhizhaev A. M., Cherepakhin A. V.
Заглавие : Hydrogenation of the Nanopowders That Form in a Carbon-Helium Plasma Stream during the Introduction of Ni and Mg
Разночтения заглавия :авие SCOPUS: Hydrogenation of the nanopowders that form in a carbon-helium plasma stream during the introduction of ni and Mg
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 113, Is. 6. - P1057-1062. - ISSN 1063-7761, DOI 10.1134/S1063776111140135
Примечания : Cited References: 9. - This work was supported by the Russian Foundation for Basic Research, project no. 09-03-00383-a.
Ключевые слова (''Своб.индексиров.''): carbon atoms--composite nanoparticles--high temperature--hydrogen absorption--hydrogen atoms--island growth--magnesium hydride--magnesium surface--nano powders--nickel atoms--plasma streams--atoms--carbon--composite materials--density functional theory--electron beams--helium--hydrogen--hydrogenation--nanoparticles--nickel--scanning electron microscopy--thermogravimetric analysis--x ray photoelectron spectroscopy--magnesium
Аннотация: Composite nanoparticles consisting of magnesium, nickel, and carbon atoms are studied both theoretically and experimentally. The calculations performed in terms of the density functional theory show that the jump frequency of hydrogen atoms in nickel-containing magnesium hydride increases substantially near impurity nickel atoms; as a result, the rate of hydrogen absorption by magnesium also increases. Nickel on the magnesium surface is shown to be absorbed via an island growth mechanism. Composite Mg-C, Ni-C, and Mg-Ni-C powders are produced by plasmachemical synthesis in a carbon-helium plasma stream. Hydrogen is introduced into a chamber during synthesis. It is found by X-ray photoelectron spectroscopy and thermogravimetric analysis that, among these three composites, only Mg-Ni-C contains magnesium fixed in the MgH2 compound. The process of such "ultrarapid" hydrogenation of magnesium, which occurs in the time of formation of composite nanoparticles, can be explained by the catalytic action of nickel, which is enhanced by a high temperature. Scanning electron microscopy micrographs demonstrate the dynamics of the dehydrogenation of Mg-Ni-C composite nanoparticles in heating by an electron beam.
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7.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Churilov G.N., Osipova I.V., Novikov P.V., Lopatin V.A., Krylov A.S., Tomashevic Ye, Petrakovskaya E.A.
Заглавие : Influence of Acoustic and Magnetic Fields on the Formation of Fullerenes and Nano tubes in Carbon-Helium High-Frequency Plasma under Atmospheric
Место публикации : Pressure Fullerenes, Nano tubes and Carbon Nanostructures. - 2010. - Vol. 18, Is. 04-06. - С. 584–589
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8.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Churilov G. N., Osipova I. V., Marchenko S. A., Gulyaeva U. E.
Заглавие : Influence of sonic and magnetic fields on fullerene and nanotube formation in carbon-helium plasma of high frequency at atmospheric pres?sure
Коллективы : "Fullerenes and Atomic Clusters", Biennial International Workshop
Место публикации : 9th Biennial International Workshop "Fullerenes and Atomic Clusters" (IWFAC 2009): July 6-10, 2009, St Petersburg, Russia : abstracts. - 2009. - Ст.P5.7. - С. 114
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9.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Nazarov V. G., Gunyakov V. A., Parshin A. M., Zyryanov V. Ya., Shabanov V. F.
Заглавие : Optical anisotropy of uniaxially oriented films of polymer-encapsulated liquid crystals
Коллективы : International Seminar on Display Optics
Место публикации : J. Opt. Technol. - 2005. - Vol. 72, Is. 9. - P.675-677. - SEP. - ISSN 1070-9762, DOI 10.1364/JOT.72.000675
Примечания : Cited Reference Count: 13
Ключевые слова (''Своб.индексиров.''): dichroic dyes--laser radiation--optical anisotropy--uniaxially oriented films--anisotropy--density (optical)--dyes--helium neon lasers--light polarization--light scattering--light transmission--liquid crystal polymers--optical films
Аннотация: Uniaxially oriented films of polymer-encapsulated liquid crystals (PELCs) possess strong light-scattering anisotropy. The macroscopic transmittance anisotropy in uniaxially oriented PELC films can be strengthened by adding dichroic dyes to the LC drops. The ratio T-perpendicular to/T-parallel to of the principal components of the optical transmittance polarized perpendicular and parallel to the orientation of the PELCs, respectively, has been measured for He-Ne laser radiation transmitted through uniaxially oriented samples. The experiments showed that the transmittance anisotropy T-perpendicular to/T-parallel to for samples doped with dye is greater than the anisotropy caused only by light scattering. (c) 2005 Optical Society of America.
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Osipova I.V.
Заглавие : Recording of nitrogen-contained carbon-helium plasma parameters by emission spec?troscopy method and investigation of obtained nanosized substances
Коллективы : "Diagnostics of carbon nanostructures", One day conference, School for young scientists
Место публикации : One day conference / School for young scientists "Diagnostics of carbon nanostructures". - P.22
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