Now showing items 1-10 of 190
Investigations on PVP/Y3BO6:Eu3+, a red Luminescent composite for lighting devices based on near UV-LEDs
(Journal Of Materials Chemistry C, 2014-08-21) [Artigo]
This work deals with a red phosphor. Y3BO6:Eu3+, and its corresponding poly(N-vinylpyrrolidone) (PVP)/Y3BO6:Eu3+ luminescent composite film suitable for applications in the next generation of Hg-free lamps based on near ...
Time evolution of the structure function and dynamical scaling in porous SnO2 dry gels
(Nuclear Inst. and Methods in Physics Research, B, 1995-05-02) [Artigo]
An in situ study of the structural evolution of a porous SnO2 dry gel, under isothermal conditions, was carried out by means of the SAXS technique. The time evolution of the structure function is in agreement with the ...
Influence of cerium (IV) ions on the inorganic and organic phase for preparation of a siloxane-PMMA based film on tin plate substrate
(17th International Corrosion Congress 2008: Corrosion Control in the Service of Society, 2008-12-01) [Trabalho apresentado em evento]
Tinplate is one of the most widely used food canning materials, however, there are significant problems related to the use of tinplate cans, such as alterations in sensory features affecting food quality and corrosion ...
EXAFS study of niobium sites in nanocrystalline Nb-doped SnO2 oxide ceramics
(Journal of Materials Science Letters, 2001-03-01) [Artigo]
Double optical monitoring of time-dependent film formation
(Proceedings of SPIE - The International Society for Optical Engineering, 2005-12-23) [Trabalho apresentado em evento]
A brief overview of optical monitoring for vacuum and wet bench film deposition processes is presented. Interferometric and polarimetric measurements are combined with regard to simultaneous real-time monitoring of refractive ...
Sol-gel synthesis of titania-alumina catalyst supports
(Applied Catalysis A: General, 2002-08-30) [Artigo]
Titanium oxide is a good candidate as new support for hydrotreating (HDT) catalysts, but has the inconvenience of presenting small surface area and poor thermal stability. To overcome these handicaps TiO2-Al2O3 mixed oxides ...
Estudo da secagem de materiais híbridos siloxano-PMMA preparados pelo processo sol-gel
(Eclética Química, 2002-01-01) [Artigo]
Híbridos siloxano-PMMA apresentando ligações covalentes entre as fases orgânica e inorgânica foram preparados a partir do processo sol-gel. O efeito da fração em massa de fase siloxano no mecanismo de secagem dos géis a ...
Small-angle X-ray scattering study of sol-gel-derived siloxane-PEG and siloxane-PPG hybrid materials
(Journal of Physical Chemistry B, 1999-06-17) [Artigo]
Hybrid organic-inorganic two-phase nanocomposites of siloxane-poly(ethylene glycol) (SiO3/2-PEG) and siloxane-poly(propylene glycol) (SiO3/2-PPG) have been obtained by the sol-gel process. In these composites, nanometric ...
Sintering and crystallite growth of nanocrystalline copper doped tin oxide
(Journal of Physical Chemistry B, 1999-04-08) [Artigo]
The effect of Cu2+ contents and of firing temperature on sintering and crystallite growth of nanocrystalline SnO2 xerogels was analyzed by thermoanalysis (mass loss (TG), linear shrinkage, and differential thermal analysis ...
The effect of Nb2O5 on crystallite growth during the sintering of SnO2 ceramics
(Journal of Materials Science Letters, 1993-07-01) [Artigo]