Инд. авторы:	Ivanova N.A., Onischuk A.A., Vosel S.V., Purtov P.A., Kulik L.V., Rapatskiy L.L., Vasenin N.T., Anufrienko V.F.
Заглавие:	EPR spectra of aerosol particles formed by pyrolysis of C 3H 8 plus Ar and C 3H 8 plus Fe(CO) 5 plus Ar mixtures in a flow reactor
Библ. ссылка:	Ivanova N.A., Onischuk A.A., Vosel S.V., Purtov P.A., Kulik L.V., Rapatskiy L.L., Vasenin N.T., Anufrienko V.F. EPR spectra of aerosol particles formed by pyrolysis of C 3H 8 plus Ar and C 3H 8 plus Fe(CO) 5 plus Ar mixtures in a flow reactor // Applied Magnetic Resonance. - 2009. - Vol.35. - Iss. 4. - P.625-637. - ISSN 0937-9347. - EISSN 1613-7507.
Внешние системы:	DOI: 10.1007/s00723-009-0191-3; SCOPUS: 2-s2.0-65749086268;
Реферат:	eng: The paper is devoted to electron paramagnetic resonance investigation of nanoparticles and aggregates of nanoparticles formed by pyrolysis of propane as well as a mixture of propane and iron pentacarbonyl. The measurement showed that the pyrolysis of the C 3H 8 plus Ar mixture results in the formation of a carbonaceous phase (phase I), which is quite different from that formed by the C 3H 8 plus Fe(CO) 5 plus Ar mixture (phase II). In phase I there is a strong oxygen effect for as-prepared samples; 75% of spins are accessible to the environmental gas via the interconnected system of microvoids and microchannels. In phase II there was a weak oxygen effect for the as-prepared samples. However, after exposition of phase II to air for 160 h, the properties of phase II have become about the same as that of phase I. A strong oxygen effect was observed for the air-exposed phase II. The line width for phase II increases monotonically with the iron content in the sample. This increase is probably related to the dipole-dipole interactions between the radical centers and the iron atoms distributed throughout the carbon matrix. © 2009 Springer.
Ключевые слова:	Pyrolysis; Propane; Paramagnetism; Paramagnetic resonance; Oxygen; Nanoparticles; Mixtures; Iron compounds; Electron spin resonance spectroscopy; Electron resonance; Phase II; Phase I; Argon; Micro voids; Iron pentacarbonyl; Iron content; Iron atoms; Interconnected systems; In-phase; Flow reactors; EPR spectra; Electron paramagnetic resonance; Dipole dipole interactions; Carbon matrix; Aerosol particles; Oxygen effect;
Издано:	2009
Физ. характеристика:	с.625-637