4.6 Article

Effects of precursor concentration on the physicochemical properties of ambient-pressure-dried MTES based aerogels with using pure water as the only solvent

期刊

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
卷 100, 期 3, 页码 477-488

出版社

SPRINGER
DOI: 10.1007/s10971-021-05665-0

关键词

MTES based aerogel; Ambient pressure drying; Hydrophobicity; Thermal properties; Mechanical properties

资金

  1. National Natural Science Foundation of China [51904336]
  2. Natural Science Foundation of Hunan Province [2020JJ4714]
  3. Fundamental Research Funds for the Central Universities [202501003, 202045001]

向作者/读者索取更多资源

This study presents a simple synthesis method for MTES-based aerogels using pure water as the only solvent and investigates the effects of precursor concentration on physicochemical properties. The results show that precursor concentration does not affect chemical composition, but at lower concentrations, denser and slenderer skeletons are formed.
This work presents a facile synthesis approach of methyltriethoxysilane (MTES) based aerogels using pure water as the only solvent, and the effects of precursor concentration on the physicochemical properties are investigated in detail. Therein, the precursor concentration has no effect on the chemical composition but causes the denser and slenderer skeletons at the lower precursor concentration and vice versa. At the 14.4 vol% precursor concentration, the MTES based aerogels are made up of slender skeletons, having the minimum density (0.057 g/cm(3)), the maximum porosity (97.5%), and the low thermal conductivity (29.4 mW/m/K). It further finds the denser and slenderer silica skeletons cause higher compressive strength and higher Young's modulus. The TG-DSC results indicate the nice thermal stability of MTES based aerogels. In short, this research demonstrates the great competitive advantages of MTES based aerogels in the field of thermal insulation from the view of preparation method, thermal conductivity, and thermal stability. [GRAPHICS] .

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