Hydrophobic GeO<sub>2</sub> Aerogels by an Epoxide-Induced Process
This article reports a new straightforward method for producing hydrophobic GeO<sub>2</sub> aerogels in a one-pot synthesis. For the first time, the epoxide-induced sol–gel process was combined with the co-precursor method to create hydrophobic aerogels. The application of a complex of a...
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MDPI AG
2025-03-01
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| Online Access: | https://www.mdpi.com/2310-2861/11/4/225 |
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| author | Olga M. Gajtko Svetlana V. Golodukhina Sergey Yu. Kottsov Elena N. Subcheva Vladimir V. Volkov Gennady P. Kopitsa Alexandra G. Son Varvara O. Veselova |
| author_facet | Olga M. Gajtko Svetlana V. Golodukhina Sergey Yu. Kottsov Elena N. Subcheva Vladimir V. Volkov Gennady P. Kopitsa Alexandra G. Son Varvara O. Veselova |
| author_sort | Olga M. Gajtko |
| collection | DOAJ |
| description | This article reports a new straightforward method for producing hydrophobic GeO<sub>2</sub> aerogels in a one-pot synthesis. For the first time, the epoxide-induced sol–gel process was combined with the co-precursor method to create hydrophobic aerogels. The application of a complex of analytical methods like SEM, TEM, low-temperature nitrogen adsorption–desorption, SAXS and contact angle measurements enabled us to determine that varying the GeCl<sub>4</sub>:(C<sub>2</sub>H<sub>5</sub>)<sub>2</sub>GeCl<sub>2</sub> ratio allows for targeted adjustments in the morphology, porous structure, and surface properties of aerogels. As the proportion of (C<sub>2</sub>H<sub>5</sub>)<sub>2</sub>GeCl<sub>2</sub> grows, the surface area increases from 45 to 123 m<sup>2</sup>∙g<sup>−1</sup> and the contact angle changes from 22.1 to 140.1°. Luminescent properties of the hydrophobic GeO<sub>2</sub> aerogels are reported for the first time, and it is established that the ratio of green and blue bands in the luminescence spectra when excited under 390 and 235 nm varies depending on the GeCl<sub>4</sub>:(C<sub>2</sub>H<sub>5</sub>)<sub>2</sub>GeCl<sub>2</sub> ratio used for the aerogel preparation. |
| format | Article |
| id | doaj-art-b792964139c6444fb79f7b7f0b44ecdd |
| institution | OA Journals |
| issn | 2310-2861 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Gels |
| spelling | doaj-art-b792964139c6444fb79f7b7f0b44ecdd2025-08-20T02:28:28ZengMDPI AGGels2310-28612025-03-0111422510.3390/gels11040225Hydrophobic GeO<sub>2</sub> Aerogels by an Epoxide-Induced ProcessOlga M. Gajtko0Svetlana V. Golodukhina1Sergey Yu. Kottsov2Elena N. Subcheva3Vladimir V. Volkov4Gennady P. Kopitsa5Alexandra G. Son6Varvara O. Veselova7N.S. Kurnakov Institute of General and Inorganic Chemistry RAS, Leninskii Prosp., 31, Moscow 119991, RussiaN.S. Kurnakov Institute of General and Inorganic Chemistry RAS, Leninskii Prosp., 31, Moscow 119991, RussiaN.S. Kurnakov Institute of General and Inorganic Chemistry RAS, Leninskii Prosp., 31, Moscow 119991, RussiaScientific Center for Genetics and Life Sciences, Sirius University of Science and Technology, Olympic Ave 1, Sochi 354340, RussiaKurchatov Complex of Crystallography and Photonics of NRC «Kurchatov Institute», Leninskii Prosp., 31, Moscow 119333, RussiaKonstantinov Petersburg Nuclear Physics Institute of NRC «Kurchatov Institute», Orlova Roshcha 1, Gatchina 188300, RussiaN.S. Kurnakov Institute of General and Inorganic Chemistry RAS, Leninskii Prosp., 31, Moscow 119991, RussiaN.S. Kurnakov Institute of General and Inorganic Chemistry RAS, Leninskii Prosp., 31, Moscow 119991, RussiaThis article reports a new straightforward method for producing hydrophobic GeO<sub>2</sub> aerogels in a one-pot synthesis. For the first time, the epoxide-induced sol–gel process was combined with the co-precursor method to create hydrophobic aerogels. The application of a complex of analytical methods like SEM, TEM, low-temperature nitrogen adsorption–desorption, SAXS and contact angle measurements enabled us to determine that varying the GeCl<sub>4</sub>:(C<sub>2</sub>H<sub>5</sub>)<sub>2</sub>GeCl<sub>2</sub> ratio allows for targeted adjustments in the morphology, porous structure, and surface properties of aerogels. As the proportion of (C<sub>2</sub>H<sub>5</sub>)<sub>2</sub>GeCl<sub>2</sub> grows, the surface area increases from 45 to 123 m<sup>2</sup>∙g<sup>−1</sup> and the contact angle changes from 22.1 to 140.1°. Luminescent properties of the hydrophobic GeO<sub>2</sub> aerogels are reported for the first time, and it is established that the ratio of green and blue bands in the luminescence spectra when excited under 390 and 235 nm varies depending on the GeCl<sub>4</sub>:(C<sub>2</sub>H<sub>5</sub>)<sub>2</sub>GeCl<sub>2</sub> ratio used for the aerogel preparation.https://www.mdpi.com/2310-2861/11/4/225epoxide-assisted sol–gel processgelaerogelcontact anglehydrophobicityluminescence |
| spellingShingle | Olga M. Gajtko Svetlana V. Golodukhina Sergey Yu. Kottsov Elena N. Subcheva Vladimir V. Volkov Gennady P. Kopitsa Alexandra G. Son Varvara O. Veselova Hydrophobic GeO<sub>2</sub> Aerogels by an Epoxide-Induced Process Gels epoxide-assisted sol–gel process gel aerogel contact angle hydrophobicity luminescence |
| title | Hydrophobic GeO<sub>2</sub> Aerogels by an Epoxide-Induced Process |
| title_full | Hydrophobic GeO<sub>2</sub> Aerogels by an Epoxide-Induced Process |
| title_fullStr | Hydrophobic GeO<sub>2</sub> Aerogels by an Epoxide-Induced Process |
| title_full_unstemmed | Hydrophobic GeO<sub>2</sub> Aerogels by an Epoxide-Induced Process |
| title_short | Hydrophobic GeO<sub>2</sub> Aerogels by an Epoxide-Induced Process |
| title_sort | hydrophobic geo sub 2 sub aerogels by an epoxide induced process |
| topic | epoxide-assisted sol–gel process gel aerogel contact angle hydrophobicity luminescence |
| url | https://www.mdpi.com/2310-2861/11/4/225 |
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