Electrical potential near hydrated surface of ordered mesoporous molecular sieves assessed by EPR of molecular pH-probes / Kovaleva Elena G.,Molochnikov Leonid S.,Golovkina Elena L.,Hartmann Martin,Kirilyuk Igor A.,Grigoriev Igor A. // MICROPOROUS AND MESOPOROUS MATERIALS. - 2015. - V. 203, l. . - P. 1-7.

ISSN/EISSN:

1387-1811 / 1873-3093

Type:

Article

Abstract:

Some of the most important parameters of mesoporous materials are Stem 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. (C) 2014 Elsevier Inc. All rights reserved.

Author keywords:

Double electrical layer; Zeta, Stern, Surface electrical potentials; Ordered mesoporous materials; pH-sensitive nitroxide radicals AREA SILICON OXYNITRIDE; X-RAY-DIFFRACTION; SPIN PROBES; MECHANICAL STABILITY; CATALYTIC-PROPERTIES; SENSITIVE NITROXIDE; CYTOCHROME-C; ADSORPTION; MCM-41; POLARITY

DOI:

10.1016/j.micromeso.2014.10.01

Web of Science ID:

ISI:000347593000001

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	FEB
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
EISSN	1873-3093
Keywords-Plus	AREA SILICON OXYNITRIDE; X-RAY-DIFFRACTION; SPIN PROBES; MECHANICAL STABILITY; CATALYTIC-PROPERTIES; SENSITIVE NITROXIDE; CYTOCHROME-C; ADSORPTION; MCM-41; POLARITY
Research-Areas	Chemistry; Science \& Technology - Other Topics; Materials Science
Web-of-Science-Categories	Chemistry, Applied; Chemistry, Physical; Nanoscience \& Nanotechnology; Materials Science, Multidisciplinary
Author-Email	gek1969@bk.ru lsmolochnikov@gmail.com golovkina\_e.l@mail.ru martin.hartmann@ecrc.uni-erlangen.de kirilyuk@nioch.nsc.ru grig@nioch.nsc.ru
ResearcherID-Numbers	Hartmann, Martin/C-4720-2011 Kovaleva, Elena/M-7400-2016 Kirilyuk, Igor/R-1688-2016
ORCID-Numbers	Kovaleva, Elena/0000-0002-3111-345X Kirilyuk, Igor/0000-0001-6033-0368
Funding-Acknowledgement	Russian Foundation for Basic Research {[}14-03-00898]; State task of the Ministry of Education (RF) {[}4.1626.2014/K]
Funding-Text	This work was supported by the Russian Foundation for Basic Research (Grant 14-03-00898) and by the State task of the Ministry of Education (RF) No 4.1626.2014/K. The experiments were conducted at the Technical University of Kaiserslautern within the Program of Cooperation ``Mikhail Lomonosov{''} between the Ministry of Education of Russian Federation and the German Service of Academic Exchanges (DAAD).
Number-of-Cited-References	53
Usage-Count-Last-180-days	3
Usage-Count-Since-2013	32
Journal-ISO	Microporous Mesoporous Mat.
Doc-Delivery-Number	AY5DI