Results 181 to 190 of about 13,503 (229)

Organofunctional silica aerogels

Journal of Sol-Gel Science and Technology, 1997
Organically modified silica aerogels were prepared from mixtures of tetramethoxysilane (TMOS) and organofunctional alkoxysilanes RSi(OMe)3 with R = mercaptopropyl, diphenylphosphinoethyl and chloropropyl. The base catalyzed hydrolysis and condensation reactions, followed by supercritical drying with liquid carbon dioxide were investigated.
N. Hüsing, U. Schubert
openaire   +1 more source

Additive manufacturing of silica aerogels

Nature, 2020
Owing to their ultralow thermal conductivity and open pore structure1-3, silica aerogels are widely used in thermal insulation4,5, catalysis6, physics7,8, environmental remediation6,9, optical devices10 and hypervelocity particle capture11. Thermal insulation is by far the largest market for silica aerogels, which are ideal materials when space is ...
Shanyu Zhao, Gilberto Siqueira, Sarka Drdova, David Norris, Christopher Ubert, Anne Bonnin, Sandra Galmarini, Michal Ganobjak, Zhengyuan Pan, Samuel Brunner, Gustav Nyström, Jing Wang, Matthias M. Koebel, Wim J. Malfait   +13 more
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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, Abdel Monem M Rawashdeh   +2 more
exaly   +2 more sources

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 aerogels

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
openaire   +1 more source

Assembly of Silica Nanowires on Silica Aerogels for Microphotonic Devices

Nano Letters, 2005
We report on the assembly of low-loss silica nanowires into functional microphotonics devices on a low-index nondissipative silica aerogel substrate. Using this all-silica technique, we fabricated linear waveguides, waveguide bends, and branch couplers.
Limin, Tong, Jingyi, Lou, Rafael R, Gattass, Sailing, He, Xuewen, Chen, Liu, Liu, Eric, Mazur   +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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An overview on alumina-silica-based aerogels

Advances in Colloid and Interface Science, 2020
Silica aerogels are remarkable materials with excellent physicochemical properties, such as high porosity and surface area, along with low density and thermal conductivity. In addition to their outstanding properties, these materials are quite interesting due to the possibility to change their chemistry according to intended applications. However, they
Cláudio M R, Almeida, Mariana E, Ghica, Luísa, Durães   +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
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Structure and self-similarity of silica aerogels

Physical Review B, 1988
Small-angle neutron scattering from silica aerogels reveals that they form mutually self-similar volume fractals for a wide range of densities and preparations. The fractal dimension is D=2.40\ifmmode\pm\else\textpm\fi{}0.03. The fractal behavior extends down to near-molecular sizes. Indication for a volume-to-surface fractal crossover is also obtained.
, Vacher, , Woignier, , Pelous, , Courtens   +3 more
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