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Effects of the surface chemical modification by ethoxysilanes on the evolution of 3D structure and composition of porous monoliths consisting of the alumina hydroxides nanofibrils in the temperature range 25 – 1700 °Cстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Khodan A., Kanaev A., Esaulkov M., Kiselev M., Nadtochenko V.
- Журнал: Nanomaterials
- Том: 12
- Номер: 20
- Год издания: 2022
- Издательство: MDPI
- Местоположение издательства: Basel, Switzerland
- Первая страница: 3591
- Последняя страница: 3603
- DOI: 10.3390/nano12203591
- Аннотация: Bulk nanomaterials with an open porosity offer exciting prospects for creating new functionalmaterials for various applications in photonics, IR-THz optics, metamaterials, heterogeneousphotocatalysis, monitoring and cleaning toxic impurities in the environment. However, their availability is limited by the complexity of controlling the process of synthesis of bulk 3D nanostructures with desired physicochemical and functional properties. In this paper, we performed a detailed analysis of influence of a silica monolayer chemically deposited on the surface of a monolithic ultraporous nanostructure, consisting of a 3D nanofibril network of aluminum oxyhydroxide, on the evolution of structure and morphology, chemical composition and phase transformations after heat treatment in the temperature range of 20-1700 °C. The experimental results are interpreted in the framework of a physical model taking into account surface and volume mass transport and sintering kinetics of nanofibrils, which made it possible to estimate activation energies of the surface diffusionand sintering processes. It is shown that the presence of a surface silica monolayer on the surface affects the kinetics of aluminum oxyhydroxide dehydration and inhibits diffusion mass transfer and structural phase transformations. As a result, the overall evolution of the 3D nanostructure significantly differs from that of nanomaterials without surface chemical modification.https://doi.org/10.3390/nano12203591
- Добавил в систему: Ходан Анатолий Николаевич
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