Now showing items 1-10 of 157
Structural evolution up to 1100 degrees C of xerogels prepared from TEOS sonohydrolysis and liquid phase exchanged by acetone
(Elsevier B.V., 2006-02-01)
Silica xerogels were prepared from sonohydrolysis of tetraethoxysilane and exchange of the liquid phase of the wet gel by acetone. Monolithic xerogels were obtained by slow evaporation of acetone. The structural characteristics ...
EXAFS and XRD Study of the Structural Evolution during Isothermal Sintering of SnO2 Xerogels
The formation of an ordered (crystalline) phase during isothermal sintering of SnO2 monolithic xerogels, at 200, 250, 300, 400, 500, 600 and 700°C, has been analyzed by the combined use of EXAFS and XRD techniques. For the ...
Effects of poly(vinyl alcohol) additions on the structure of silica xerogels
(Elsevier B.V., 2009-09-01)
Poly(vinyl alcohol)/silica hybrid xerogels were prepared from sonohydrolysis of tetraethoxysilane (TEOS) and additions of water-solution of poly(vinyl alcohol) (PVA). The samples were Studied by small-angle X-ray scattering ...
The effects of temperature of condensation on the thermal stability and morphology of 1,4-phenylenediamine-1-propylsilica xerogels
Charged silsesquioxane used as a vehicle for gold nanoparticles to perform the synthesis of catalyst xerogels
Femtosecond laser fabrication of waveguides in Rhodamine B-doped GPTS/TEOS-derived organic/silica monolithic xerogel
This paper reports on the fabrication and characterization of waveguides inside of a dye doped-organic/inorganic bulk material using femtosecond laser microfabrication. Rhodamine B-doped GPTS/TEOS-derived organic/silica ...
Lead preconcentration by solid phase extraction using oxidized carbon xerogel and spectrophotometric determination with dithizone
(Elsevier Science, 2016-09)
The proposed methodology is based on the preconcentration of Pb2+ on oxidized carbon xerogel, a porous material of low density and high surface area. Adsorbed Pb2+ was eluted with HCl, followed by complexion with dithizone ...
The influence of Na+ on the anilinepropylsilica xerogel synthesis by using the fluoride nucleophilic catalyst
(Springer-verlagNew YorkEUA, 2003)
Synthesis, characterization, and catalytic properties of a mesostructured lamellar xerogel tungsten oxide phase
(ELSEVIER SCIENCE BV, 2011)
Cetyltrimethylammonium bromide (CTAB) and n-hexadecylamine (HDA) have been used as template in the synthesis of a mesolamellar xerogel tungsten oxide phase (WO(3)/CTAB/HDA). The catalytic properties of the resulting material ...