Preparation and thermal properties of chemically prepared nanoporous silica aerogels

作者：Gutzov S^*; Danchova N; Karakashev S I; Khristov M; Ivanova J; Ulbikas J

来源：Journal of Sol-Gel Science and Technology, 2014, 70(3): 511-516.

DOI：10.1007/s10971-014-3315-7

• Silica aerogels
• Sol-gel
• Thermal properties
• Hydrophobization

This work focuses on the dependence preparation conditions-structure-physical properties of hydrophobic silica aerogels, all of them prepared under subcritical drying conditions (70 A degrees C and 0.4 atm.), thus aiming at potential application as case insulation filling in heat pumps. The so prepared, millimeter scaled nano-porous hydrophobic silica aerogel granules were analyzed with standard electron microscope and atomic force microscopy, IR spectroscopy, UV/Vis spectroscopy, differential scanning calorimetry and thermal conductivity measurements. The physical properties of the aerogels were compared with commercial aerogel granules. A method for contact angle measurement of micro-droplets situated on the silica granules was proposed to quantify the level of their hydrophobicity.

• 出版日期2014-6