Synthesis and Characterization of Hydrophobic Silica Aerogel by Two Step(Acid-Base) Sol-Gel Process
نویسندگان
1 Department of Chemistry, Faculty of Science, Imam Khomeini International University, Qazvin, Iran
2 Department of Chemistry, Faculty of Science, Imam Khomeini International University, Qazvin, Iran
3 Departments of Chemistry, Iran University of Science and Technology, Tehran, Iran
4 Department of Material Science, Faculty of Engineering, Imam Khomeini International University, Qazvin,Iran
doi
10.7508/jns.2013.02.006چکیده
The silica aerogel was prepared by the acid–base sol–gel polymerization of tetraethylorthosilicate precursor followed by ambient pressure drying. The prepared silica aerogels were characterized by Fourier transform infrared )FT-IR(, Thermo-gravimetric and differential thermal analysis )TG/DTA(, X-ray diffractometer )XRD(, Energy dispersive X-ray microanalysis )EDX(, Brunauer–Emmitt–Teller (BET) and Scanning electron microscopy (SEM). The result silica aerogel is a light and crack-free solid with very low bulk density 0.027 g /cm3, high specific surface area 655.58 m2/ g and large pore volume 0.4831 cm3/ g. The average size of particles was calculated using a Microstructure Measurement program and Minitab statistical software.
