No abstract

Sol-gel derived glasses based on SiO 2-CaO were studied with and without Zn as doping element. Investigations of their in vitro bioactivity were performed by soaking the glass powders in biological fluids for time periods up to 4 days. The surface reactions were characterized at the micrometer scale and with a high level of efficiency for both major and trace elements by using Particle Induced X-ray Emission (PIXE) associated to Rutherford Backscattering Spectroscopy (RBS). The evolution of the biological medium composition was followed by ICP-AES analyses. If the bioactivity of binary SiO 2-CaO glasses is already known, this study shows the improvement of the early step of the bioactive process by using zinc as a doping element. Indeed, zinc improves the specific surface area and then the number of sites for the nucleation of calcium phosphate precipitates. In addition, Zn-doping slows the

No abstract

No abstract

No abstract

To minimize air pollution resulting from exhaust gas emission, a decrease in the concentrations of the sulfur compounds in fuels has become a major issue in the last 10 years. The development of catalysts for the hydrodesulfurization process is a challenge for the oil industry. In the present work, a new and easy way to synthesize Ni-Mo-S hydrotreatment catalysts and in particular the effect of ionic liquids on the final structure was studied. It was shown that the addition of the ionic liquid [BMIM][NTf 2 ] to the main reactants [Ni(NO 3 ) 2 ·6H 2 O and (NH 4 ) 2 MoS 4 ] had a great impact on the [a]

No abstract

No abstract