Compressed exfoliated graphite with hydrophobic coating based on condensation products of tetraethoxysilane in organic solvents

Divitskaya, D.A.; Ivanov, A.V.; Syunyakova, S.M.; Volkova, S.I.; Maksimova, N.V.; Kalachev, I.L.; Kirichenko, A.N.; Rodionov, N.B.; Avdeev, V.V.

Авторы: Divitskaya Daria A., Ivanov Andrei V., Syunyakova Safiya M., Volkova Svetlana I., Maksimova Natalia V., Kalachev Igor L., Kirichenko Alexey N., Rodionov Nikolai B., Avdeev Victor V.
Журнал: Materials Chemistry and Physics
Том: 338
Год издания: 2025
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Первая страница: 130669
Номер статьи: 130669
DOI: 10.1016/j.matchemphys.2025.130669
Аннотация: Compressed exfoliated graphite (CEG) is usually used as a sealing material for pipelines in petroleum refining and nuclear energy production. CEG has an ability to withstand high temperatures and aggressive environments. Despite CEG being composed almost entirely carbon, the material has remaining oxygen groups on its surface, which leads to decreasing hydrophobicity. This in turn can lead to the diffusion of water into the material and the reduction of the searing efficiency. Thus, the aim of this work is to decrease the water wettability by modification of CEG with hydrophobic coating based on tetraethoxysilane. The coating was obtained by condensation of tetraethoxysilane in isopropanol, acetone and heptane solvents. The structure of the obtained materials was investigated by XRD, SEM, Raman and FTIR spectroscopy. The dynamic contact angles of water, glycerol, formamide and octane were measured. Based on these measurements the polar and dispersive components of the surface free energy were determined for CEG without coating and CEG with tetraethoxysilane-based coating. The coating of CEG leads to an increase of the water contact angle and a decrease of the polar component of the surface energy in comparison to CEG without coating. The hydrophobicity of the coating obtained from solutions with different solvents increases respectively: isopropanol, acetone, heptane, which is due to the polarity of these solvents. Thus, the increase in hydrophobicity is achieved by tetraethoxysilane-based coating on the surface of hydrophilic CEG. Ссылка: Divitskaya D.A., Ivanov A.V., Syunyakova S.M., Volkova S.I., Maksimova N.V., Kalachev I.L., Kirichenko A.N., Rodionov N.B., Avdeev V.V. Compressed exfoliated graphite with hydrophobic coating based on condensation products of tetraethoxysilane in organic solvents. // Materials Chemistry and Physics. 2025. V. 338 P. 130669. DOI: 10.1016/j.matchemphys.2025.130669; Дата публикации онлайн: 3 March 2025. Дата публикации: 1 July 2025. Заключение на возможность публикования: 14.01.2025 N 112.0032.2025.
Добавил в систему: Иванов Андрей Владимирович

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Compressed exfoliated graphite with hydrophobic coating based on condensation products of tetraethoxysilane in organic solventsстатья

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