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High surface area methyltriethoxysilane-derived aerogels by ambient pressure drying
Journal of Porous Materials, 2010In this paper we report the synthesis of methyltriethoxysilane (MTES) based aerogels by non-supercritical/ambient pressure drying. The alcogels have been aged in different concentrations of silane precursor solutions before drying and aerogels with low density and high porosity were obtained.
P. R. Aravind, Sorarù, Gian Domenico
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Bronchial response to breathing dry gas at 3.7 MPa ambient pressure
European Journal of Applied Physiology and Occupational Physiology, 1994In diving, pulmonary mechanical function is limited by the increased density of the gas breathed. Breathing cold and dry gas may cause an additional increase in airways resistance. We have measured forced vital capacity, forced expired volume in 1 s (FEV1) and forced midexpiratory flow rate (FEF25%-75%) before and after breathing dry or humid gas at 29-
I, Rønnestad +3 more
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Processing of low-density silica gel by critical point drying or ambient pressure drying
Journal of Non-Crystalline Solids, 2001Abstract Various methods for the production of low-density silica from silica gel were studied. The silica gel was prepared by the `two-step' sol–gel method. The `DSB process' (developed by Deshpande, Smith and Brinker), which takes the gel through solvent exchange, reaction with trimethylchlorosilane (TMCS) and ambient pressure drying (APD), was ...
Valerie D Land +2 more
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Surface modification of silica aerogels with trimethylchlorosilane in the ambient pressure drying
Inorganic Materials, 2008Silica aerogels were made by sol-gel techniques using tetraethoxysilane, followed by drying under ambient pressure. BET and XRD results show that the silica aerogels have a high inner surface area and are amorphous. Laser granularity analysis shows that the average particle size of silica aerogels is less than 20 μ m and that they have mesoporous ...
XiaoChun Zhou, LuPing Zhong, YaPing Xu
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Processing of alumina low-density xerogels by ambient pressure drying
Journal of Non-Crystalline Solids, 2001Abstract Alumina is utilized as a catalyst and catalyst support, applications that can benefit from a high surface area and significant mesopore volume. Such characteristics can be achieved through ambient pressure drying (APD) using a methodology similar to that which has proven successful with silica.
J.Wayne Frazee, Thomas M Harris
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Preparation and Properties of Hydrophobic Silica Aerogels by Ambient Pressure Drying Method
Applied Mechanics and Materials, 2011Silica alcogels were prepared by hydrolysis with hydrochloric acid and condensation with NH4OH of ethanol diluted tetraethylorthosilicate (TEOS) precursor and trimethylchlorosilane and hexane as surface modifying agent. The physical properties such as density, appearance, hydrophobicity, surface area, pore size distribution and thermal stability were ...
Hui Wang, Shi Ming Liu, Ling Ke Zeng
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Hydrophobic Flexible Silica Aerogels Felts Fabricated by Ambient Pressure Drying
Advanced Materials Research, 2013Hydrophobic flexible silica aerogels felts were fabricated successfully by two-steps sol-gel process via ambient pressure drying. First of all, the sol with various pH values was obtained from tetraethylorthosilicate (TEOS) as silicon source, hydrochloric acid/aqueous ammonia ethanol solution as catalysts.
Xiao Yun Wu +3 more
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Synthesis of Silica Aerogel from Bagasse Ash by Ambient Pressure Drying
AIP Conference Proceedings, 2011Silica aerogels having very high surface area and pore volume have been succesfully synthesized from bagasse ash by ambient pressure drying (APD) method. Silica in bagasse ash was extracted by alkali extraction to produce sodium silicate solution. This is done by boiling bagasse ash in 2 N NaOH solution under continuous stirring for 1 h.
Nazriati Heru Setyawan +3 more
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The properties of silica aerogels hybridized with SiO2 nanoparticles by ambient pressure drying
Ceramics International, 2012Abstract In this study, we report the chemical characteristics of silica aerogels that were produced by adding SiO 2 nanoparticles into silica aerogel by ambient pressure drying. We synthesized silica aerogel composites with different weight percentages of SiO 2 nanoparticles ranging from 0 wt% to 0.025 wt% of the total amount of solution.
In-Keun Jung +5 more
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Synthesis of platinum nanoparticles on carbon aerogel by ambient pressure drying method
Materials Letters, 2010Abstract Platinum nanoparticles were successfully synthesized on porous carbon aerogel with narrow pore size distribution by ambient pressure drying method. Platinum doped carbon aerogels were synthesized by sol–gel polymerization of resorcinol with furfural in non aqueous medium followed by ambient pressure drying and pyrolysis of organic gel. These
Rashmi Singh +5 more
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