State and forms of water in dispersed aluminum oxides and hydroxides

Kozerozhets, I.V.; Semenov, E.A.; Avdeeva, V.V.; Ivakin, Y.D.; Kupreenko, S.Y.; Egorov, A.V.; Kholodkova, A.A.; Vasil'ev, M.G.; Kozlova, L.O.; Panasyuk, G.P.

Статья опубликована в высокорейтинговом журнале

Информация о цитировании статьи получена из Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 20 февраля 2024 г.

Авторы: Kozerozhets I.V., Semenov E.A., Avdeeva V.V., Ivakin Yu D., Kupreenko S.Yu, Egorov A.V., Kholodkova A.A., Vasil'ev M.G., Kozlova L.O., Panasyuk G.P.
Журнал: Ceramics International
Том: 49
Номер: 18
Год издания: 2023
Издательство: Pergamon Press Ltd.
Местоположение издательства: United Kingdom
Первая страница: 30381
Последняя страница: 30394
DOI: 10.1016/j.ceramint.2023.06.300
Аннотация: The state and forms of water in dispersed aluminum oxides and hydroxides and products obtained during their treatment are investigated in this paper. It has been found that particles of dispersed aluminum oxides and hydroxides of various water forms are present on surface and in volume. Their classification based on the state of water and the values of ΔH of evaporation has been introduced: “surface-bound” water, “structural” water, and “single OH groups”. For micron particles, the presence of predominantly “structural” water is exemplified for gibbsite (Al(OH)3) and boehmite (AlOOH). For the defective structure of products of heat treatment of gibbsite in air at 250 and 800°С, a low dehydroxylation temperature and high values of ΔH of water evaporation have been found: 71.13 kJ/mol and 67.27 kJ/mol, respectively. For the γ-Al2O3 nanopowder and the products of its treatment, the presence of “surface-bound”, “structural” water, and water represented by “single OH groups” has been detected. It has been shown that the treatment of gibbsite or aluminum oxide in a supercritical aqueous fluid at a water/Al2O3 molar ratio of less than 1.5 leads to the formation of tohdite 5Al2O3•H2O, the composition of which is characterized by a low content of structural water in the stable state over a wide temperature range.
Добавил в систему: Холодкова Анастасия Андреевна

	ИСТИНА	Войти в систему Регистрация
	ИСТИНА ПсковГУ
	Главная Поиск Статистика О проекте Помощь

ИСТИНА

ИСТИНА ПсковГУ

State and forms of water in dispersed aluminum oxides and hydroxidesстатья

Прикрепленные файлы