Physical and Structural Characteristics of Gel-derived Glasses Prepared via Different Drying Procedures
محل انتشار: مجله علم مواد و مهندسی ایران، دوره: 18، شماره: 4
سال انتشار: 1400
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 155
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شناسه ملی سند علمی:
JR_IJMSEI-18-4_004
تاریخ نمایه سازی: 24 بهمن 1401
چکیده مقاله:
In the present work, monolithic gels were prepared through different drying procedures including
super critical, infrared wavelengths and traditional drying methods. Dense and transparent glasses
were obtained after controlled heat treatment of the dried porous xerogels in air atmosphere.
The chemical bonding as well as different properties of the prepared gels and the relevant glasses
were examined by means of Fourier transform infrared spectroscopy (FTIR), Brunauer-Emmitt-
Teller (BET) and UV-Vis spectrometer. Based on the obtained results, different drying conditions
affect the average pore size and the total pore volume of the studied gels. The mean pore size was
found to be ۸.۷ nm, ۲.۴ nm and ۳.۲ nm for super critical, IR radiation and slow drying in air
atmosphere, respectively. The glass network structure was significantly changed by heat treatment temperature so that the B-O-Si bonds were formed only after ۴۵۰ °C. It was found that the gel dried under super critical condition was unable to reach to its full density all over the selected sintering temperature interval.
کلیدواژه ها:
نویسندگان
Sara Ahmadi
Standard Research institute, Technology and Engineering Research Center, Construction and Minerals Research Group, Alborz, Iran
Bijan Eftekhari Yekta
Ceramic Division, School of Materials and Metallurgy Engineering, Iran University of Science and Technology, Tehran, Iran
Hossein Sarpoolaky
Ceramic Division, School of Materials and Metallurgy Engineering, Iran University of Science and Technology, Tehran, Iran
Alireza Aghaei
Ceramic Department, Materials and Energy Research Center (MERC), Alborz, Iran
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