Low thermal-conductivity and high thermal stable silica aerogel based on MTMS/Water-glass co-precursor prepared by freeze drying. (5th January 2017)

• Record Type: Journal Article
• Authors: Pan, Yuelei; He, Song; Gong, Lunlun; Cheng, Xudong; Li, Congcong; Li, Zhi; Liu, Zhong; Zhang, Heping
• Is Part Of: Materials & design. Volume 113(2017)
• Page Start: 246
• Page End: 253
• Publication Date: 2017-01-05
• Subjects: Silica aerogels -- MTMS/Water-glass -- Freeze drying -- Hydrophobic -- Thermal stability; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2016.09.083
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: In this paper, hybrid silica aerogels were prepared by methltrimethoxysilane (MTMS) and water-glass co-precursor through two-step sol-gel process followed by freeze drying (FD). The characteristics of aerogels were strongly affected by the molar ratio of MTMS/Water-glass. When the molar ratio is 5.1, hybrid aerogel was obtained with good performances, such as low density (0.083 g/cm 3 ), high contact angle (155.1°) and low thermal conductivity (0.0226 W/m·K). The density, contact angle and thermal conductivity of aerogels based on co-precursor are still showing excellent thermal stability with the same performances after 550 °C heat-treatment. Graphical abstract: Highlights: Hybrid aerogel based on organic and in-organic silicon source was prepared. Hybrid aerogel was prepared under freezing drying. The hybrid aerogel shows high thermal stability and low thermal conductivity.