Dynamics of pH-sensitive nitroxide radicals in water adsorbed in ordered mesoporous molecular sieves by EPR Spectroscopy
Kovaleva EG, Molochnikov LS, Golovkina EL, Hartmann M, Kirilyuk IA, Grigor'Ev IA (2013)
Publication Status: Published
Publication Type: Journal article, Original article
Publication year: 2013
Journal
Publisher: Elsevier
Book Volume: 179
Pages Range: 258-264
DOI: 10.1016/j.micromeso.2013.05.019
Abstract
A spin pH probe technique was used to study the influence of the channel diameter on the EPR spectra of pH-sensitive nitroxide radicals (NR) located in the channels of the mesoporous molecular sieves MCM-41 and SBA-15 with diameters ranging from 2.3 to 8.1 nm. From EPR spectra analysis and the results of the NR retention by the mesoporous molecular sieves upon washing with an aqueous KCl solution, the regularities of NR molecular location inside the channels were studied. The obtained dependence of the fraction of the radical molecules in the fast motional regime (with the rotational correlation times, tau(c) = 2 x 10(-11) s-9 x 10(-11)s) in the channels of the mesoporous molecular sieves as a function of pH indicates that both NR in the fast and slow motional regime (with tau(c) = 8 x 10(-9)s-7 x 10(-10)s) may be used for estimation of the solution acidity inside the channels and of the near-surface electrical potential. (C) 2013 Elsevier Inc. All rights reserved.
Authors with CRIS profile
Additional Organisation(s)
Involved external institutions
Ural Federal University B.N. Yeltsin
Russian Federation (RU)
Ural State Forest Engineering University (USFEU) / Уральский государственный лесотехнический университет (УГЛТУ)
Russian Federation (RU)
Russian Academy of Sciences / Росси́йская акаде́мия нау́к (RAS)
Russian Federation (RU)
Russian Federation (RU)
Ural State Forest Engineering University (USFEU) / Уральский государственный лесотехнический университет (УГЛТУ)
Russian Federation (RU)
Russian Academy of Sciences / Росси́йская акаде́мия нау́к (RAS)
Russian Federation (RU)
How to cite
APA:
Kovaleva, E.G., Molochnikov, L.S., Golovkina, E.L., Hartmann, M., Kirilyuk, I.A., & Grigor'Ev, I.A. (2013). Dynamics of pH-sensitive nitroxide radicals in water adsorbed in ordered mesoporous molecular sieves by EPR Spectroscopy. Microporous and Mesoporous Materials, 179, 258-264. https://doi.org/10.1016/j.micromeso.2013.05.019
MLA:
Kovaleva, Elena G., et al. "Dynamics of pH-sensitive nitroxide radicals in water adsorbed in ordered mesoporous molecular sieves by EPR Spectroscopy." Microporous and Mesoporous Materials 179 (2013): 258-264.
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