期刊
MOLECULES
卷 26, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/molecules26061796
关键词
sol-gel; aerogel; IR; adsorption; fractal dimension
资金
- project CoE National center of mechatronics and clean technologies [BG05M2OP001-1.001-0008-C01]
The study combines ATR-IR spectroscopy and nitrogen adsorption-desorption isotherms to characterize silica aerogel granules with different degrees of hydrophobicity, revealing dependencies between texture properties, pore architectures, surface fractal dimensions, and degree of hydrophobicity.
Attenuated Total Reflectance Infrared (ATR-IR) spectroscopy and texture measurements based on nitrogen adsorption-desorption isotherms are combined to characterize silica aerogel granules with different degrees of hydrophobicity. The aerogels were prepared from tetraethoxysilane via a room temperature hydrolysis-gelation process, solvent exchange, hydrophobization, and drying at subcritical conditions. The dependencies between the texture properties, pore architectures, surface fractal dimensions, and degree of hydrophobicity of the samples are extracted from the ATR-IR spectra and the adsorption-desorption isotherms. The IR absorption in the region of the Si-O-Si and Si-OH vibrations is used for a description of the structural and chemical changes in aerogel powders connected with their surface hydrophobization. The Frenkel-Halsey-Hill (FHH) theory is applied to determine the surface fractal dimension of the powder species.
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