Electrical potential near hydrated surface of ordered mesoporous molecular sieves assessed by EPR of molecular pH-probes / Kovaleva E.G., Molochnikov L.S., Golovkina E.L., Hartmann M., Kirilyuk I.A., Grigoriev I.A. // Microporous and Mesoporous Materials. - 2015. - V. 203, l. C. - P. 1-7.

ISSN:
13871811
Type:
Article
Abstract:
Some of the most important parameters of mesoporous materials are Stern potential of double electrical layer (DEL) and surface charge because of the pivotal role they play in the adsorption of charged molecular species. There are not any conventional and easy-to-perform techniques used to measure Stern potential in porous systems. The purpose of this work is to measure Stern potential in a specific case, i.e., practically cylindrical nanosized hydrated channels of the mesoporous molecular sieves (MMS) MCM-41 and SBA-15 with channel diameters ranging from 2.3 to 8.1 nm using pH-sensitive nitroxide radicals (NR). A technique for direct measurement of the near-surface (Stern) potential using pH-sensitive NR was developed. Negative and positive values of Stern potential for the positively and negatively charged surface of MMS channels were found. The ranges of pH of external solution for the near-zero charge, boost-charging of the channel surface and for dissociation of functional groups in the MMS studied were found. © 2014 Elsevier Inc. All rights reserved.
Author keywords:
Double electrical layer; Ordered mesoporous materials; pH-sensitive nitroxide radicals; Zeta, Stern, Surface electrical potentials
Index keywords:
Hydration; Molecular sieves; pH sensors; Sieves; Double electrical layer; Electrical potential; External solutions; Mesoporous molecular sieves; Negatively charged surfaces; Nitroxide radicals; Ordere
DOI:
10.1016/j.micromeso.2014.10.01
Смотреть в Scopus:
https://www.scopus.com/inward/record.uri?eid=2-s2.0-84926187477&doi=10.1016%2fj.micromeso.2014.10.010&partnerID=40&md5=7cfa934af242939d85129435c56b4a2f
Соавторы в МНС:
Другие поля
Поле Значение
Link https://www.scopus.com/inward/record.uri?eid=2-s2.0-84926187477&doi=10.1016%2fj.micromeso.2014.10.010&partnerID=40&md5=7cfa934af242939d85129435c56b4a2f
Affiliations Institute of Chemical Engineering, Ural Federal University, Mira St., 19, Yekaterinburg, Russian Federation; Department of Inorganic and General Chemistry, Ural State Forest Engineering University, Siberian Highway, 37, Yekaterinburg, Russian Federation; Erlangen Catalysis Resource Center (ECRC), Friedrich-Alexander Universität Erlangen-Nürnberg, Egerlandstraße 3, Erlangen, Germany; Institute of Organic Chemistry, Siberian Branch, Russian Academy of Sciences, Akad. Lavrent'ev Av., 9, Novosibirsk, Russian Federation
Author Keywords Double electrical layer; Ordered mesoporous materials; pH-sensitive nitroxide radicals; Zeta, Stern, Surface electrical potentials
Funding Details MOE, Russian Foundation for Basic Research; 14-03-00898, RFBR, Russian Foundation for Basic Research
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Correspondence Address Kovaleva, E.G.; Institute of Chemical Engineering, Ural Federal University, Mira St., 19, Russian Federation
Publisher Elsevier
CODEN MIMMF
Language of Original Document English
Abbreviated Source Title Microporous Mesoporous Mater.
Source Scopus