Results 141 to 150 of about 1,946 (182)

Low-Energy Vibration Excess in Silica Xerogels

Physical Review Letters, 1997
Specific heat (1.5-25 K) and Raman scattering (below 100cm −1 in silica xerogels permit one to assess the frequency dependence of the coupling coefficient C(ω)and the low-energy density of states g(ω) Different network connectivity does not change the shape of the quasielastic scattering, but alters the spectral shape of C(ω)The results permit one to ...
FONTANA A, ROSSI F, CARINI, Giuseppe, D'ANGELO, Giovanna, TRIPODO, Gaspare, BARTOLOTTA A.   +5 more
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Carbon Xerogels for Effluent Treatment

Journal of Chemical & Engineering Data, 2020
The adsorption process of carbonized xerogels in the form of porous microspheres or monoliths was found to be reversible.
Athulya Pillai, Balasubramanian Kandasubramanian   +1 more
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Aerogels and xerogels for catalytic applications

Journal of Non-Crystalline Solids, 1992
Abstract The aerogel method, consisting of preparation of solid catalysts by sol-gel processes of organometallic precursors and drying the wet gel under hypercritical conditions, is a particularly interesting way to obtain highly divided materials for catalytic applications. Special attention is given to PbO ZrO 2 and PbO Al 2 O 3 aerogel catalysts.
R. Tleimat-Manzalji, T. Manzalji, G.M. Pajonk   +2 more
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Antenna effect in an oxide xerogel

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 1998
Abstract Silica xerogel doped with [Eu⊂cryptand] 3+ was prepared by the sol-gel method from a hydrolyzed tetramethoxysilane solution containing [Eu⊂cryptand](CF 3 SO 3 ) 2 Br. UV-visible optical absorption spectra, fluorescence excitation and emission spectra, fluorescence lifetime as well as luminescence quantum yield were measured. Experiments were
K Czarnobaj, M Elbanowski, Z Hnatejko, A.M Klonkowski, S Lis, M Pietraszkiewicz   +5 more
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Elastic Properties of Silica Xerogels

Journal of the American Ceramic Society, 1990
To calculate elastic constants, longitudinal and tranverse acoustic wave velocities were measured for silica xerogels as a function of relative humidity (rh). The silica xerogels studied are microporous with open porosity of 53 vol%. The longitudinal wave velocity exhibits a minimum at about 35% rh.
Bennet Abramoff, Lisa C. Klein
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Xerogel film formation

Xerogels are solid, glass-like compounds formed through the sol-gel process. The sol-gel process is a route by which a colloidal solution is transformed into a solid gel through a series of hydrolysis and condensation reactions. The xerogel results from drying the gel via evaporation.
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Microstructure of puffed silica xerogel

Journal of Materials Science Letters, 1993
The structural evolution that takes place during sol-to-gel and gel-to-glass transformations has fascinated both experimentalists and theoreticians [1-5]. In situ techniques [6] such as nuclear magnetic resonance, Raman and infrared spectroscopy, small-angle X-ray, neutron and light scattering, and studies including gas adsorption-desorption analyses ...
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Xerogel package

Chemometrics and Intelligent Laboratory Systems, 2009
Rameela Chandrasekhar, Jeffrey C. Miecznikowski, Daniel P. Gaile, Venu Govindaraju, Frank V. Bright, Kimberly F. Sellers   +5 more
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Polysilsesquicarbodiimide Xerogels

2008
S. Nahar-Borchert, A. O. Gabriel, R. Riedel   +2 more
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Ruthenium-based catalysts supported on carbon xerogels for hydrogen production via ammonia decomposition

Applied Catalysis A: General, 2022
Guangru Zhang
exaly