The bonding properties of cations in phosphate glasses determine many short- and medium-range structural features in the glass network, hence influencing bulk properties. In this work, Pb-Al-metaphosphate glasses (1 - x)Pb-(PO(3))(2)center dot xAI(PO(3))(3) with 0 0.48 more than one nonbridging O can be linked to AlO(n) polyhedra. There is no corn...
FAPESP[02/10489-2]
FAPESP
Financiadora de Estudos e Projetos (FINEP)
Alkanethiols, selenols and tellurols are generated in situ by reaction of elemental sulfur, selenium and tellurium with commercial alkyllithiums, followed by reaction with deoxygenated water. The alkanechalcogenols react in situ with activated ole. ns in a Michael- type addition reaction. (c) 2008 Elsevier B. V. All rights reserved.
Neutron activation analysis was applied to assess trace elements concentrations in head hair from healthy elderly people living in the Sao Paulo metropolitan area. Concentrations of As, Br, Ca, Cl, Co, Cr, Cu, Fe, K, La, Mn, Na, Sb, Se and, Zn were determined. Comparisons were made between the results obtained for dyed and non-dyed hair as well as ...
10.1039/b708926k / DALTON TRANSACTIONS / 40 / 4582-4588 / completed
Technetium is a radioactive contaminant found in groundwaters at sites where nuclear wastes have been processed or stored. The redox chemistry of technetium is a major control on its environmental mobility. Under oxic conditions, technetium exists as the pertechnetate ion, Tc(VII)O-4(-), which is poorly sorbed by minerals across a wide range of env...
A novel hydrothermal process for preparation of single-phase pseudoboehmite. from Supersaturated sodium aluminate solution with SB pseudoboehmite seed was presented. The process is characterized by precipitation for 3 h at temperature around 125 degrees C with a seed ratio of 1.0. Precipitation yield of Al2O3 over 20% could be reached and the speci...
The thin films of TiO2 doped manipulatively by Ni were prepared by a section-controlled process of sol-gel method. The activity of thin films was characterized by photocatalytic degradation of aqueous methyl orange under UV irradiation. The results showed that the photocatalytic activity of TiO2 thin film remarkably enhanced by non-uniformly doping...
