کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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6481125 | 1428939 | 2017 | 7 صفحه PDF | دانلود رایگان |
This research relates to the synthesis of hydrophobic silica aerogel and glass-fibre based composite with higher surface area, hence higher thermal insulating properties with strength and rigidity against mechanical damaging forces. Glass fibre mats were impregnated with different sols and subjected to freeze drying after aging at ambient temperature and pressure. The freeze drying retained the silica structure intact but removed the water from internal chaotic capillary channels. The bimodal meso and macro porous composite board was obtained. The thermal conductivity measured to be in the range from 0.021 to 0.026Â W/mK with different compositions of silica sols ranging from 4% to 32%. The most important property obtained was the higher strength of the board with the 32% silica sol obtained up to 7Â MPa in flexural and 4Â MPa in tensile modes. Low densities and higher porosities were obtained.
Journal: Energy and Buildings - Volume 151, 15 September 2017, Pages 494-500