Now showing items 11-20 of 157
Optical characteristics of Er3+-Yb3+ doped SnO2 xerogels
(Elsevier B.V., 2002-10-07)
Er3+ doped SnO2 xerogels have been obtained from aqueous colloidal suspensions. Emission and excitation spectra were obtained and allowed the identification of two main families of sites for Er3+. In the first one Er3+ ...
The gelation temperature effects in the anilinepropylsilica xerogel properties
(Elsevier Science BvAmsterdamHolanda, 2002)
Small-angle X-ray scattering and nitrogen adsorption study of the nanoporosity elimination in TEOS sonohydrolysis-derived xerogels
Small-angle X-ray scattering (SAXS) and nitrogen adsorption techniques were used to study the temperature and time structural evolution of the nanoporosity in silica xerogels prepared from acid- and ultrasound-catalyzed ...
Spectrophotometric determination of dithizone-mercury complex by solid phase microextraction in micropipette tip syringe packed with activated carbon xerogel
(Elsevier Science, 2016-11)
A new simple miniaturized solid phase microextraction system in a syringe was developed for mercury (Hg) preconcentration of in water samples based on the adsorption of its dithizone complex on a microcolumn. The syringe ...
Short Range Order Evolution in the Preparation of SnO2 Based Materials
The evolution of Eu3+ doped SnO2 xerogels to the cassiterite structure observed during sintering was studied by means of Eu3+ spectroscopy, XRD and EXAFS at the Sn K-edge. Eu3+ ions adsorbed at the surface of colloidal ...
Sol-gel prepared AlPO(4) with incorporating Rhodamine 6G
(ELSEVIER SCIENCE BV, 2010)
Rhodamine 6G (RH6G) laser dye-doped AlPO(4) xerogel and glass were prepared via a simple sol-gel route by one-step process and two-step process, respectively. The aggregating behavior of dyes in xerogel and glass was studied ...
Thermal properties of fluoride glasses and their gel precursors
(Kluwer Academic Publ, 2004-01-01)
Xerogels were prepared from zirconium, barium, aluminum, lanthanum and lithium acetates, corresponding to a Li containing ZBLA composition. The study of their thermal properties (DSC, TG/DTG, FT-IR) showed that they might ...
Preparation of mesoporous titania xerogels under controlled synthesis conditions. Effects of processing in the textural, adsorption and photocatalytic properties
(Elsevier Science, 2017-10)
A straightforward and potentially scalable procedure based in the Evaporation-Induced Self-Assembly (EISA) method has been used in order to synthesize mesoporous titania (TiO2) xerogels. The structural, textural and ...
Study on the structural and electrocatalytic properties of Ba2+- and Eu3+-doped silica xerogels as sensory platforms
This work reports on the sol-gel synthesis of barium- and europium-doped silica xerogel and its use as an electrocatalytic sensor. Barium was chosen to assist the network framing and europium to provide electronic properties, ...