Effect of protic solvents on the physical properties of the ambient pressure dried hydrophobic silica aerogels using sodium silicate precursor

2007 ◽  
Vol 15 (5) ◽  
pp. 507-512 ◽  
Author(s):  
A. Parvathy Rao ◽  
A. Venkateswara Rao ◽  
Jyoti L. Gurav
Keyword(s):  
Physical Properties ◽  
Sodium Silicate ◽  
Ambient Pressure ◽  
Silica Aerogels ◽  
Hydrophobic Silica ◽  
Protic Solvents

Physical properties of sodium silicate based silica aerogels prepared by single step sol–gel process dried at ambient pressure

2009 ◽  
Vol 476 (1-2) ◽  
pp. 397-402 ◽  
Author(s):  
Jyoti L. Gurav ◽  
A. Venkateswara Rao ◽  
A. Parvathy Rao ◽  
D.Y. Nadargi ◽  
S.D. Bhagat
Keyword(s):  
Physical Properties ◽  
Sodium Silicate ◽  
Ambient Pressure ◽  
Sol Gel ◽  
Silica Aerogels ◽  
Single Step ◽  
Sol Gel Process

Preparation of Hydrophobic Silica Aerogels from Industrial Microsilica and its Oil Adsorption Properties

2012 ◽  
Vol 531-532 ◽  
pp. 103-107 ◽  
Author(s):  
Fei Shi ◽  
Jing Xiao Liu ◽  
Xiao Li Dong ◽  
Zhi Wei Zhang ◽  
Peng Cheng Du ◽  
...  
Keyword(s):  
Sodium Silicate ◽  
Hydrothermal Reaction ◽  
Ambient Pressure ◽  
Sodium Silicate Solution ◽  
Silicate Solution ◽  
Silica Aerogels ◽  
Ambient Pressure Drying ◽  
Mixed Solution ◽  
Hydrophobic Silica ◽  
Oil Adsorption

Hydrophobic silica aerogels were prepared from industrial microsilica via ambient pressure drying. The process consists of two stages, synthesis of sodium silicate solution from microsilica by hydrothermal reaction with sodium hydroxide, and preparation of silica aqueous gel and porous silica aerogels from the obtained sodium silicate solution. The mixed solution of hexane/ethanol/trimethylchlorosilane was used to modify the sol-gel derived silica aqueous gel so as to obtain porous structure by ambient pressure drying. The microstructure, pore properties of the silica aerogels were analyzed by FTIR and N2 adsorption-desorption methods, and the oil adsorption of the synthesized silica aerogels was investigated. The results indicate that the obtained silica aerogels are light-weight and hydrophobic porous materials, with the specific surface area of 767~828 m2•g-1, porosity of 91.5~95.1% and the average pore diameter of 5.22~8.02 nm. The synthesized silica aerogels have good oil adsorption capacity and the highest saturated oil adsorption rate can achieve 1105%.

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