Abstract: Acidic characteristics of various inorganic materials, such as silica gel, aluminum, and titanium(IV) oxides, original and modified with F- and SO42- ions, in the form of hydrogels and nanostructured powders doped by copper(II) ions, are studied. It is shown that pH values inside pores of the studied sorbents (pH(intr)) differ from the pH of external solutions by 0.5-1.1 units. In the pores of original gamma-Al2O3, the pH(intr) values are higher, while, in pores of gamma-Al2O3 samples modified with F- (sic) SO (2-)(4), as well as nonmodified alpha-Al2O3, SiO2 gel, and TiO2 hydrogels, pH(intr) are lower compared to the pH of the external solution. It is found that pH(intr) decreases, as the content of Cu2+ ions in the TiO2 phase grows, and, beginning with a certain moment, it coincides with pH of an equilibrium solution. The pK(a) values of functional group dissociation in some materials are determined. It is shown that, using spin probes, that is, pH-sensitive nitroxyl radicals, the electrostatic potential of the surface of nanostructured TiO2 can be estimated.

Cite: Molochnikov L.S. , Kovaleva E.G. , Golovkina E.L. , Kirilyuk I.A. , Grigor'ev I.A.
Spin probe study of acidity of inorganic materials
Colloid Journal. 2007. V.69. N6. P.769-776. DOI: 10.1134/S1061933X07060130 WOS Scopus РИНЦ

ArticleLinkType.TRANSLATED_TO_ORIGINAL: Молочников Л.С. , Ковалева Е.Г. , Головкина Е.Л. , Кирилюк И.А. , Григорьев И.А.
Метод спинового зонда в исследовании кислотности неорганических материалов
Коллоидный журнал. 2007. Т.69. №6. С.821-828. РИНЦ

Dates:

Published print:

Dec 1, 2007

Identifiers:

Web of science	WOS:000251484200013
Scopus	2-s2.0-36849094961
Elibrary	13555744
OpenAlex	W2016526328

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