研究目的
To study the treatment of TEOS with Bigunide A as a catalyst for producing high bulk density silica gel with lower content of Si-OH bond and to understand the reaction mechanism.
研究成果
The study demonstrated that Bigunide A as a catalyst in the sol–gel method produces silica gel with high bulk density, large specific surface area, and small pore size. The mechanism involves the activation of silanol by A, leading to direct polycondensation with alkoxy silane, resulting in dense three-dimensional structures.
研究不足
The study focused on the sol–gel method using TEOS and specific organic bases, which may limit the generalizability of the findings to other materials or catalysts. The reaction conditions were sensitive to pH, temperature, and other factors, which could affect reproducibility.
1：Experimental Design and Method Selection:
The study involved the sol–gel method using TEOS with various organic bases, including Bigunide A, to produce silica gel. The reaction conditions and catalysts' effects were analyzed.
2：Sample Selection and Data Sources:
TEOS was used as the primary material, with various organic bases as catalysts. The resulting silica gels were analyzed for their physical and chemical properties.
3：List of Experimental Equipment and Materials:
Equipment included a 400 MHz spectrometer for NMR, Autosorb iQ for BET analysis, Smartlab X-ray Diffractometer for SAXS, and NICOLET 380 for ATR-FTIR. Materials included TEOS, various organic bases, and solvents.
4：Experimental Procedures and Operational Workflow:
The process involved mixing TEOS with water and organic base catalysts, stirring, filtering, and drying the resulting silica gel. The products were then analyzed for density, surface area, pore volume, and chemical bonds.
5：Data Analysis Methods:
The analysis included BET isotherm equation for surface area and pore size, SAXS for pore size distribution, and FTIR for chemical bond analysis.
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