التفاصيل البيبلوغرافية
| العنوان: |
Preparation of SiO2 aerogel by water glass: effect of different sodium removal methods on aerogel properties. |
| المؤلفون: |
Sun, Wei, Yu, Lu, Su, Jikai, Liu, Ruixiang, Yan, Xuemei, Su, Dong, Zhang, Pengyu, Li, Xiaolei |
| المصدر: |
Journal of Sol-Gel Science & Technology; Jan2025, Vol. 113 Issue 1, p274-284, 11p |
| مستخلص: |
Removal of Na+ is a very important step in the SiO2 aerogel preparation using water glass as precursor, which has a significant effect on the structure and properties of aerogel. In this study, three methods (Solution-crystallization, Water washing, and Ion exchange) were used to remove Na+ from the system and investigated the effects of different methods on the aerogel properties. The results show that all three aerogels have low bulk density (<0.075 g/cm3), low thermal conductivity (≤0.015 W/(m·K)), and well hydrophobicity (θ ≥ 137°). Among them, Na+ exists in the sol in the sodium removal process by water washing and effects the uniformity of gel network. The samples for sodium removal by solution-crystallization show better hydrophobicity and poorer high-temperature stability, which is related to the presence of abundant hydrophobic groups (Si-OC2H5) on the gel surface. The microstructure and the pore size distribution of the aerogels prepared by ion exchange are uniform, which makes them have optimal comprehensive performance. The mechanism of solution-crystallization effect in the process of sodium removal was explored, providing a workable idea for low-cost preparation of SiO2 aerogel. Highlights: Water glass was chosen as the inorganic silica source to prepare SiO2 aerogel with good performance. The effects of different sodium removal methods on the properties of aerogels were explored. The mechanism of solution-crystallization effect in the process of sodium removal was explored. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |