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Effect of Heat Treatment on Silica Aerogels Prepared via ambient drying

Journal of Materials Science & Technology 2007年第3期23卷 402-406页

作者： Fei SHI Lijiu WANG Jingxiao LIU Miao ZENG Building Materials Research Lab Dalian University of Technology Dalian 116024 China Department of Materials Science and Engineering Dalian Institute of Light Industry Dalian 116034 China

Silica aerogels were prepared at ambient drying by using ethanol/trimethylchlorosilane （TMCS）/heptane solution as pore water exchange and surface modification of the wet gel before drying. The obtained silica aerogels exhibit a sponge-like structure with uniform pore size distribution. The effects of heat-treatment on the hydrophobicity, specific surface area and other properties were investigated. The results indicated that the hydrophobicity of silica aerogels could be maintained up to 350℃. With increasing heating temperature, hydrophobicity decreased, and became completely hydrophilic after heat-treatment at 500℃. Brunaueremmitt-teller （BET） surface area results indicated that the specific surface area of silica aerogels increased with increasing heating temperature in the range of 150-500℃. The effects of heat-treatment on the morphology and chemical bonding state of silica aerogels were investigated by scanning electron microscopy （SEM）, differential temperature analysis （DTA） and Fourier-transform infrared spectroscopy （FT-IR）.

关键词： Silica aerogel ambient drying Hydrophobicity Specific surface area Heat-treatment

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Comparison of drying Rate and Energy Consumption between Vacuum and ambient Pressure drying for Chinese Fir

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Chinese Forestry Science and Technology 2011年第Z1期10卷 19-25页

作者： PENG Yiqing LI Fan TAN Hui YI Songlin College of Materials Science and Technology Beijing Forestry UniversityBeijing 100083P.R.China Xishuangbanna Comprehensive Technical Inspection Center Jinghong 666100YunnanP.R.China

In this work, Chinese fir samples with a size of 400 mm (L) by 50 mm (W) 30 mm (H) weretaken as specimens, and drying rate and energy consumption were compared under the conditions, inwhich the absolute pressure was 0.02 , 0.04 , 0.06 and 0.10 MPa, respectively, and the temperature was80 oC. The results showed that, when the moisture content (MC) of the samples was above fibersaturation point (FSP), the vacuum drying rate was 0.96-1.24 times as high as the ambient pressuredrying rate. However, when it was below FSP, the vacuum drying rate was 1.26-1.32 times as high as theambient pressure drying rate. At the same time, when the MC was above FSP, the energy consumptionof vacuum drying was 81.1%-95.9% of that of ambient pressure drying; when the MC was below FSP,the energy consumption of vacuum drying was 62.40%-69.40% of that of ambient pressure ***, the vacuum drying was superior to the ambient pressure drying in terms of drying rate andenergy consumption.

关键词： Chinese fir(Cunninghamia lanceolata) vacuum drying ambient drying drying rate

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