Results 181 to 190 of about 242,895 (228)
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Journal of Non-Crystalline Solids, 1995
Abstract Hydrophobic silica aerogels were produced by the -Si(Me)3 (trimethylsilyl substituent: TMS) modification of alcogels followed by CO2 supercritical drying. The structure of trimethylsilyl modified silica aerogel (TMSA) was the silica matrix produced by hydrolysis and condensation of only tetramethoxysilane (TMOS).
H. Yokogawa, M. Yokoyama
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Abstract Hydrophobic silica aerogels were produced by the -Si(Me)3 (trimethylsilyl substituent: TMS) modification of alcogels followed by CO2 supercritical drying. The structure of trimethylsilyl modified silica aerogel (TMSA) was the silica matrix produced by hydrolysis and condensation of only tetramethoxysilane (TMOS).
H. Yokogawa, M. Yokoyama
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Journal of Non-Crystalline Solids, 1998
Abstract This paper begins with the story of monolithic, transparent silica aerogels when in 1968 a paper was published by Nicolaon and Teichner where at the end of it two lines quoted that “⋯in a basic medium, the aerogels so obtained were totally transparent even through a thickness of 1 cm”.
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Abstract This paper begins with the story of monolithic, transparent silica aerogels when in 1968 a paper was published by Nicolaon and Teichner where at the end of it two lines quoted that “⋯in a basic medium, the aerogels so obtained were totally transparent even through a thickness of 1 cm”.
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¿Silica aerogel vibration testing¿
Classical and Quantum Gravity, 2001As has been shown in previous experiments (Dolesi R et al 2000 J. Low Temp. Phys.?118 219), a porous silica aerogel network can adequately constrain on-orbit motion of superfluid helium, and subsequently remove the possibility of a `helium tide' gravitational disturbance appearing in the Satellite Test of the Equivalence Principle (STEP) signal ...
S. WANG, Vitale, Stefano
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Nanoengineering Strong Silica Aerogels
Nano Letters, 2002In 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 +3 more
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Silica modified cellulosic aerogels
Cellulose, 2010Shaped 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 +6 more
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Some Applications of Silica Aerogels
ChemInform, 2003AbstractFor Abstract see ChemInform Abstract in Full Text.
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Visibly photoluminescent silica aerogels
Journal of Non-Crystalline Solids, 1997Abstract 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
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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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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, 1993A hydrophobic silica gel is prepared by hydrolysis of a triethoxysilane solution. The SiH 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, 1998By 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 +2 more
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