Silica Aerogel Monoliths Derived from Silica Hydrosol with Various Surfactants

被引:13
作者
Chen, Dong
Wang, Xiaodong [1 ]
Ding, Wenhui
Zou, Wenbing
Zhu, Qiong
Shen, Jun
机构
[1] Tongji Univ, Sch Phys Sci & Engn, Shanghai 200092, Peoples R China
基金
中国国家自然科学基金;
关键词
silica hydrosol; aerogel; ambient pressure drying; surfactant; THERMAL-CONDUCTIVITY; PHYSICAL-PROPERTIES; INSULATION;
D O I
10.3390/molecules23123192
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Owing to their ultra-low thermal conductivity, silica aerogels are promising thermal insulators; however, their extensive application is limited by their high production cost. Thus, scientists have started to explore low-cost and easy preparation processes of silica aerogels. In this work, a low-cost method was proposed to prepare silica aerogels with industrial silica hydrosol and a subsequent ambient pressure drying (APD) process. Various surfactants (cationic, amphoteric, or anionic) were added to avoid solvent exchange and surface modification during the APD process. The effects of various surfactants on the microstructure, thermal conductivity, and thermal stability of the silica aerogels were studied. The results showed that the silica aerogels prepared with a cationic or anionic surfactant have better thermal stability than that prepared with an amphoteric surfactant. After being heated at 600 degrees C, the silica aerogel prepared with a cationic surfactant showed the highest specific surface area of 131 m(2).g(-1) and the lowest thermal conductivity of 0.038 W.m(-1).K-1. The obtained low-cost silica aerogel with low thermal conductivity could be widely applied as a thermal insulator for building and industrial energy-saving applications.
引用
收藏
页数:11
相关论文
共 32 条
[1]   Impedance spectroscopic studies of sol-gel derived subcritically dried silica aerogels [J].
Anappara, AA ;
Rajeshkumar, S ;
Mukundan, P ;
Warrier, PRS ;
Ghosh, S ;
Warrier, KGK .
ACTA MATERIALIA, 2004, 52 (02) :369-375
[2]  
[Anonymous], 2011, AEROGELS HDB, DOI DOI 10.1007/978-1-4419-7589-8
[3]   Glazing systems with silica aerogel for energy savings in buildings [J].
Buratti, C. ;
Moretti, E. .
APPLIED ENERGY, 2012, 98 :396-403
[4]   Rapid synthesis of ambient pressure dried monolithic silica aerogels using water as the only solvent [J].
Cheng, Xudong ;
Li, Congcong ;
Shi, Xiaojing ;
Li, Zhi ;
Gong, Lunlun ;
Zhang, Heping .
MATERIALS LETTERS, 2017, 204 :157-160
[5]   A Special Material or a New State of Matter: A Review and Reconsideration of the Aerogel [J].
Du, Ai ;
Zhou, Bin ;
Zhang, Zhihua ;
Shen, Jun .
MATERIALS, 2013, 6 (03) :941-968
[6]  
Farn R.J., 2006, Chemistry and Technology of Surfactants, V1st
[7]   AEROGELS [J].
FRICKE, J ;
EMMERLING, A .
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1992, 75 (08) :2027-2036
[8]   Advances of thermal conductivity models of nanoscale silica aerogel insulation material [J].
He, Ya-Ling ;
Xie, Tao .
APPLIED THERMAL ENGINEERING, 2015, 81 :28-50
[9]  
HRUBESH LW, 1995, MATER RES SOC SYMP P, V381, P267, DOI 10.1557/PROC-381-267
[10]  
Hüsing N, 1998, ANGEW CHEM INT EDIT, V37, P23, DOI 10.1002/(SICI)1521-3773(19980202)37:1/2<22::AID-ANIE22>3.0.CO