Now showing items 1-10 of 306
Fractal character of the SAXS correlation volume in poly(ethylene glycol)/silica hybrid wet gels
Small-angle X-ray scattering (SAXS) was employed to study the nanostructural properties of poly(ethylene glycol)(PEG)/silica hybrid wet gels prepared from hydrolysis of tetraethoxysilane (TEOS) in mixtures with PEG/(PEG + ...
Sol-Gel Erbium-Doped Silica-Hafnia Planar and Channel Waveguides
Erbium activated SiO2 -HfO2 planar waveguides, doped with Er3+ concentrations ranging from 0.01 to 4 mol%, were prepared by sol-gel method. The films were deposited on v-SiO2 and silica-on-silicon substrates using dip-coating ...
Optical and transport properties of rare-earth trivalent ions located at different sites in sol-gel SnO2
Photoluminescence and photo-excited conductivity data as well as structural analysis are presented for sol-gel SnO2 thin films doped with rare earth ions Eu3+ and Er3+, deposited by sol-gel-dip-coating technique. ...
Reamplificação de fragmentos do cDNA do gene da "lacrimejação" da cebola amplificado por PCR e excisados de gel de poliacrilamida.
(Horticultura Brasileira, Brasilia, DF, v. 25, n. 1, p. s98, ago. 2007., 2011)
Copper Hexacyanoferrate Formation on the Modified Silica Surface with DAB-Am-16 Dendrimer
(Wiley-v C H Verlag Gmbh, 2011-01-01)
The third generation (G-3) polypropylenimine hexadecaamine dendrimer (DAB-Am-16) was grafted onto the silica gel surface. The modified silica interacts easily with Cu(2+) and then with potassium ferrocyanide to form copper ...
Erbium-activated HfO2-based waveguides for photonics
70SiO2 - 30HfO2 planar waveguides, activated by Er3+ concentration ranging from 0.3 to 1 mol%, were prepared by solgel route, using dip-coating deposition on silica glass substrates. The waveguides showed high densification ...
Nucleation and crystallization of titania nanoparticles in silica titania planar waveguides: A study by low frequency Raman scattering
SiO2 (1-x) - TiO2 (x) waveguides, with the mole fraction x in the range 0.07 - 0.20 and thickness of about 0.4 μm, were deposited on silica substrates by a dip-coating technique. The thermal treatments at 700-900°C, used ...
Chalcopyrite and bornite differentially affect protein synthesis in planktonic cells of Acidithiobacillus ferrooxidans
Acidithiobacillus ferrooxidans is used in bioleaching industrial operations to recover metal ions from mineral sulfides. Chalcopyrite and bornite are copper sulfides that have the same elemental composition, but differ in ...