Journal of Inorganic Materials ›› 2018, Vol. 33 ›› Issue (3): 259-265.DOI: 10.15541/jim20170180
• Orginal Article • Previous Articles Next Articles
YANG Jing-Feng1, 2, WANG Qi-Hua1, WANG Ting-Mei1
Received:
2017-04-17
Revised:
2017-06-04
Published:
2018-03-20
Online:
2018-03-12
About author:
YANG Jing-Feng. E-mail: jfyang@licp.cas.cn
Supported by:
CLC Number:
YANG Jing-Feng, WANG Qi-Hua, WANG Ting-Mei. Synthesis and Property of Alumina Aerogel[J]. Journal of Inorganic Materials, 2018, 33(3): 259-265.
Drying method | Characteristics | |
---|---|---|
Drying process | Alumina aerogel | |
Supercritical drying | Short drying period, high synthesis cost | Low density, high porosity and specific surface area, low volume shrinkage[ |
Ambient pressure drying | Long drying period, inexpensive synthesis cost, complicated drying process | High volume shrinkage, large pore size, high density and low specific surface area [ |
Freeze drying | Long drying period, inexpensive synthesis cost | High volume shrinkage, large pore size, high density and low specific surface area |
Table 1 Characteristics of several drying methods
Drying method | Characteristics | |
---|---|---|
Drying process | Alumina aerogel | |
Supercritical drying | Short drying period, high synthesis cost | Low density, high porosity and specific surface area, low volume shrinkage[ |
Ambient pressure drying | Long drying period, inexpensive synthesis cost, complicated drying process | High volume shrinkage, large pore size, high density and low specific surface area [ |
Freeze drying | Long drying period, inexpensive synthesis cost | High volume shrinkage, large pore size, high density and low specific surface area |
Fig. 6 Compressive stress-strain curves (a) and bulk densities and thermal conductivities (b) of C/Al2O3 aerogels heat treated at different temperatures[50]
Fig. 7 Stress-strain curves of ACAs with different contents of cellulose (ACA0.5, ACA1 and ACA2 corresponding to the cellulose content of 0.5wt%, 1wt% and 2wt%, respectively)[51]
Fig. 8 Effective specific extinction coefficient of Al2O3-SiO2 aerogel composites reinforced by SiC-coated mullite fibers prepared with different concentration of precursor[52]
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