Results 141 to 150 of about 228,536 (185)

Nanoengineering Strong Silica Aerogels

Nano Letters, 2002
In the quest for strong lightweight materials, silica aerogels would be very attractive, if they were not fragile. The strength of silica aerogel monoliths has been improved by a factor of over 100 through cross-linking the nanoparticle building blocks of preformed silica hydrogels with poly(hexamethylene diisocyanate).
Nicholas Leventis, Chariklia Sotiriou-Leventis, Guohui Zhang, Abdel-Monem M. Rawashdeh   +3 more
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Silica modified cellulosic aerogels

Cellulose, 2010
Shaped cellulosic aerogels—as the ‘young’ generation succeeding the well-established silica and synthetic polymer-based aerogels—are intriguing materials that feature properties similar to those of their antecessors combined with the additional advantages and characteristics of the re-growing biopolymer cellulose.
Marco Litschauer, Marie-Alexandra Neouze, Emmerich Haimer, Ute Henniges, Antje Potthast, Thomas Rosenau, Falk Liebner   +6 more
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Some Applications of Silica Aerogels

ChemInform, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
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Visibly photoluminescent silica aerogels

Journal of Non-Crystalline Solids, 1997
Abstract Treatment of silica aerogels with microwave-energized reducing gases induces permanent, visible photoluminescence in the material. The emission wavelength ranges from 460–500 nm. The process does not alter the transparency, monolithic structure, or surface area of the aerogel.
Michael R. Ayers, Arlon J. Hunt
openaire   +1 more source

Production of Silica Aerogel

Physica Scripta, 1981
A production facility for silica aerogel has been set up in Lund. Aerogel is now produced in large quantities with the refractive indices of 1.03 and 1.05. The standard block size is 18 × 18 × 3 cm3.
S Henning, L Svensson
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Hydrophobic silica CO2 aerogels

Journal of Non-Crystalline Solids, 1993
A hydrophobic silica gel is prepared by hydrolysis of a triethoxysilane solution. The SiH group induces a repelling water effect. CO2 hypercritical drying is performed on such a gel. The obtained aerogel exhibits hydrophobic properties similar to those of the starting gel.
M. Pauthe, F. Despetis, J. Phalippou
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Surfactant-templated silica aerogels

Microporous and Mesoporous Materials, 1998
By combining the molecular silica precursor tetramethoxysilane (TMOS) with an alkaline, micellar, water: methanol solution, we form surfactant-templated silica gel (STSG) monoliths. The wet monoliths can be exchanged with ethanol and then supercritically extracted with carbon dioxide to produce surfactant-templated silica aerogels (STSAs).
Mark T. Anderson, Patricia S. Sawyer, Thomas Rieker   +2 more
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Biopolymer-Containing Aerogels: Chitosan-Silica Hybrid Aerogels

2011
Hybrid aerogels comprising bioderived polymers and metal oxides have been explored in the case of chitosan and silica. The physical properties of homogeneous aerogels have been explored extensively and structural models have been formulated on the basis of the data.
Chunhua Jennifer Yao, Xipeng Liu, William M. Risen   +2 more
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Iron-Cobalt-Silica Aerogel Nanocomposite Materials

Journal of Sol-Gel Science and Technology, 2003
Iron-Cobalt-Silica nanocomposites were prepared in form of aerogels. X-ray diffraction, transmission electron microscopy and N2 physisorption at 77 K were used to investigate the structure, size and dispersion of the nanocrystals and the porous structure in the aerogels and in the final composites.
CASULA, MARIA FRANCESCA, CORRIAS, ANNA, PASCHINA G.   +2 more
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Nanomechanical Property Analysis of Silica Aerogel

Volume 1: 15th International Conference on Advanced Vehicle Technologies; 10th International Conference on Design Education; 7th International Conference on Micro- and Nanosystems, 2013
Aerogels (AGs) are open-cell nanofoams. AGs are lightweight and possess high thermal and acoustic insulation properties. Due to their ∼ 90% porosity, AGs are very brittle and fragile, which inhibits its use for load-bearing applications. For this reason an area of open research is the study and improvement of the mechanical properties of aerogels ...
Claudia Pagano, Curtis R Taylor
openaire   +1 more source