Use of a Drying Control Chemical Additive (DCCA) in the Sol-Gel Processing of Soda Silicate and Soda Borosilicates

2008 ◽  
pp. 546-555 ◽  
Author(s):  
Gerard Orcel ◽  
Larry L. Hench
Keyword(s):  
Sol Gel ◽  
Chemical Additive ◽  
Control Chemical ◽  
Drying Control Chemical Additive ◽  
Gel Processing

Synthesis and Effect of DCCA on the Ambient Pressure Dried, TEOS-Based Silica Aerogel

2014 ◽  
Vol 1044-1045 ◽  
pp. 119-123 ◽  
Author(s):  
Song He ◽  
Xu Dong Cheng ◽  
Hai Jiang Bi ◽  
Hui Yang
Keyword(s):  
Ambient Pressure ◽  
Mesoporous Structure ◽  
High Specific Surface Area ◽  
Low Density ◽  
Chemical Additive ◽  
Control Chemical ◽  
Microstructure Morphology ◽  
Ft Ir ◽  
Drying Control Chemical Additive ◽  
Hydrophilic Gel

In this paper, we report the experimental results on the synthesis of low-density tetraethoxysilane (TEOS)-based silica aerogels prepared under ambient pressure. The drying control chemical additive N, N-Dimethylformamide (DMF) was introduced to the experiments. Before dring, the water within alcogel was exchanged with ethanol and n-hexane. Trimethylchlorosilane (TMCS) was used to modify the hydrophilic gel surface to make sure the final aerogel is hydrophobic. The effects of solvent EtOH and DMF on the properties of the resulting aerogels were investigated. The microstructure, morphology and other properties of the aerogels were studied by FT-IR, TEM and BET measurement. The resulting aerogels have a well-developed mesoporous structure (mean pore size of ~15 nm) with low density (0.08g/cm3), a high specific surface area (1267m2/g) super hydrophobicity (Ө=165o) and high transmissivity (~90%).

Drying Control Chemical Additive (DCCA)

2016 ◽  
Author(s):  
J. Alemán ◽  
A. V. Chadwick ◽  
J. He ◽  
M. Hess ◽  
K. Horie ◽  
...  
Keyword(s):  
Chemical Additive ◽  
Control Chemical ◽  
Drying Control Chemical Additive

Sol-Gel Processing of Transparent MgAl2O4

1988 ◽  
Vol 121 ◽  
Author(s):  
Yuan-Fu Yu ◽  
Sangvavann Heng ◽  
Tai-Il Mah ◽  
Edward E. Hermes
Keyword(s):  
Sol Gel ◽  
Ceramic Materials ◽  
Metal Alkoxide ◽  
Solvent Ratio ◽  
Processing Conditions ◽  
Chemical Additives ◽  
Control Chemical ◽  
High Degree ◽  
Gel Processing ◽  
Hydrolysis Of

ABSTRACTHigh-purity, transparent monolithic spinel (MgAl2O4) was synthesized via the hydrolytic thermal decomposition of mixed alkoxide organo-metallic precursors. Several factors, such as the metal alkoxide concentration in various solvents, the water to solvent ratio, and the reaction temperatures affect the hydrolysis of the mixed alkoxides. These factors also influence the transparency of the resulting sols and gels. The degree of transparency of the sols and gels is also influenced by such factors as pH and drying control chemical additives. Variations in the processing conditions during drying, aging, and sintering of the gels produced ceramic materials with high degree of transparency.

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