Why an Apparent Surface Dimension of Silica Gels May Be Abnormally High Научная публикация
Журнал |
Langmuir
ISSN: 0743-7463 , E-ISSN: 1520-5827 |
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Вых. Данные | Год: 1999, Том: 15, Номер: 15, Страницы: 5068-5072 Страниц : 5 DOI: 10.1021/la980482g | ||
Ключевые слова | Adsorption; Alcohols; Fatty acids; Ketones; Mathematical models; Molecular structure; Monolayers; Porosity; Porous materials | ||
Авторы |
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Организации |
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Реферат:
In the present paper, some problems of the “surface resolution analysis” to characterize silica gels are addressed. We measured the adsorption of organic adsorbates (fatty acids, aliphatic alcohols, and ketones) from CCl4 solution on mesoporous silicas of various porosity. A simple linear relationship is found between the monolayer thickness and the monolayer volume, which is valid even for the adsorbates of different homology series. A simple model to describe adsorption experiments quantitatively has been developed. The model shows that the curvature of silica mesopores may influence the packing of test molecules in the monolayer and leads to a decrease in the adsorbate monolayer capacity for large molecules, so that measured surface area is underestimated. The effect increases when the ratio of adsorbed layer thickness h to pore radius R increases and may reach some tens of percent. The model explains why the apparent values of silica surface dimension may be abnormally high (Ds > 3).
Библиографическая ссылка:
Okunev A.G.
, Aristov Y.I.
Why an Apparent Surface Dimension of Silica Gels May Be Abnormally High
Langmuir. 1999. V.15. N15. P.5068-5072. DOI: 10.1021/la980482g WOS Scopus РИНЦ
Why an Apparent Surface Dimension of Silica Gels May Be Abnormally High
Langmuir. 1999. V.15. N15. P.5068-5072. DOI: 10.1021/la980482g WOS Scopus РИНЦ
Даты:
Поступила в редакцию: | 27 апр. 1998 г. |
Принята к публикации: | 11 янв. 1999 г. |
Опубликована online: | 1 июн. 1999 г. |
Опубликована в печати: | 1 июл. 1999 г. |
Идентификаторы БД:
Web of science | WOS:000081637800020 |
Scopus | 2-s2.0-0344339174 |
РИНЦ | 13323186 |
Chemical Abstracts | 1999:358552 |
Chemical Abstracts (print) | 131:121252 |
OpenAlex | W1964201068 |