Abstract: Aerogel materials attract a growing interest due to their delicate structure and unique textural properties. However, heat treatment of such materials at elevated temperatures inevitably causes the collapse of their structure. Deposition of a carbon coating is known to improve the thermal stability of nanocrystalline oxides due to the formation of a core-shell structure. In this study, calcium aluminate aerogels with a mayenite stoichiometry were covered with a carbon shell, and resorcinol was used as a carbon source. Transmission electron microscopy confirmed the presence of the carbon shell in the samples thermally treated in an argon flow. As revealed by X-ray diffraction analysis, the carbon shell allowed stabilizing the mayenite phase. When the sample was prepared using the highest resorcinol concentration (0.7 mol/mol), calcined in argon at 1100°C and annealed in air at 500°C, its specific surface area value was as high as 72 m2/g, which significantly exceeds that of pure aerogel-prepared calcium aluminate after the same treatment. Thus, covering the finely dispersed calcium aluminates with the carbon shell appears to be an efficient method to stabilize their phase composition and textural characteristics during the calcination at high temperatures required for the mayenite conversion to chemically active forms.

Cite: Gerus Y.Y. , Cherepanova S.V. , Ilyina E.V. , Shuvarakova E.I. , Bedilo A.F. , Vedyagin A.A.
Interfacial Stabilization of Calcium Aluminate Aerogels by Carbon Shell
Surfaces and Interfaces. 2025. V.56. 105754 :1-15. DOI: 10.1016/j.surfin.2025.105754 WOS Scopus AN OpenAlex

Dates:

Submitted:	Nov 6, 2024
Published print:	Jan 1, 2025
Accepted:	Jan 3, 2025
Published online:	Jan 5, 2025

Identifiers:

Web of science:	WOS:001398621600001
Scopus:	2-s2.0-85214035846
Chemical Abstracts:	2025:240633
OpenAlex:	W4406079424

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