Results 191 to 200 of about 499,894 (252)

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
openaire   +1 more source

Effect of different silylation agents on the properties of ambient pressure dried and supercritically dried vinyl-modified silica aerogels

Journal of Supercritical Fluids, 2019
Despite their unique properties, pure silica aerogels usually exhibit a few applications on a large-scale due to their hydrophilic behavior and brittleness.
R. B. Torres, J. Vareda, A. Lamy-Mendes, L. Durães   +3 more
semanticscholar   +1 more source

Environmental impact of the subcritical production of silica aerogels

, 2020
This study evaluates for the first time the environmental impacts of three different syntheses of subcritical silica aerogels. These aerogels are produced by subcritical drying, a more economical and safer process than that of the supercritical aerogels.
I. Pinto, J. Silvestre, J. Brito, M. Júlio   +3 more
semanticscholar   +1 more source

Molecularly imprinted phenyl-functionalized silica aerogels: Selective adsorbents for methylxanthines and PAHs

, 2020
Molecular imprinting of highly porous silica aerogels is reported for the first time and the selective adsorption of methylxanthines and polycyclic aromatic hydrocarbons (PAHs) has been investigated.
N. Saad, Maya Chaaban, D. Patra, A. Ghanem, Houssam El-Rassy   +4 more
semanticscholar   +1 more source

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
openaire   +1 more source

Surface modified sodium silicate based superhydrophobic silica aerogels prepared via ambient pressure drying process

Journal of Non-Crystalline Solids, 2019
The silica aerogel was synthesized by simple and cost-effective sol-gel process under ambient pressure drying. The wet gel was modified by using trimethylchlorosilane (TMCS) as silylating agent.
M. V. Khedkar, Sandeep B. Somvanshi, Ashok V. Humbe, K. M. Jadhav   +3 more
semanticscholar   +1 more source

Some Applications of Silica Aerogels

ChemInform, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
openaire   +1 more source

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

Reaction-Spun Transparent Silica Aerogel Fibers

ACS Nano, 2020
Aerogel fibers, the simultaneous embodiment of aerogel 3D network and fibrous geometry, have shown great advantages over natural and synthetic fibers in thermal insulation. However, as a fast gelation to ensure aerogel fiber spinning generally induces rapid local clustering of precursor particles (i.e., phase separation) and unavoidably results in ...
Yu Du, Xiaohua Zhang, Jin Wang, Zengwei Liu, Kun Zhang, Xiaofei Ji, Yezi You, Xuetong Zhang   +7 more
openaire   +2 more sources

Entrapment of enzymes in silica aerogels

, 2020
Aerogels, the world's lightest solids, possess extraordinary traits such as very low density, very high surface area, very high porosity and ultra-low heat conductivity.
Nir Ganonyan, Noam Benmelech, G. Bar, R. Gvishi, D. Avnir   +4 more
semanticscholar   +1 more source