A sonochemical process has been developed for the insertion of tin nanoparticles into mesoporous carbon, giving a product which was used as a building block for the anode of a rechargeable Li battery; the electrode could deliver a reversible capacity of 400 mAh gr(-1)(C + Sn) at 100% cycling efficiency, which is higher than that of graphite electrodes.
Nanoparticles of Eu2O3 and Tb2O3 have been prepared using ultrasound radiation and were deposited sonochemically on microspherical alumina particles. In a different sonochemical reaction Eu2O3 and Tb2O3 were doped into nanophased alumina particles. For both systems the decay times of the fluorescence was measured. The luminescence of the alumina substrate was found to be much shorter than that of the rare-earth oxides. Differences between the decay times of the deposited and doped materials are accounted for by the stronger guest-host interaction and absence of concentration quenching in the doped material.
Heavy metal ions such as Ag + , Pb 2+ , and Ru 3+ in aqueous solution are adsorbed onto the aquatic plant Azolla filiculoides followed by conversion to the corresponding metallic nanoparticles by the polyol reaction carried out in a microwave oven. The combined process offers a promising approach for the removal of heavy metals from wastewater using low-cost and environmentally friendly sorbents, and the recycling of adsorbed metals into marketable products. -(CHEFETZ, B.; SOMINSKI, L.; PINCHAS, M.; GINSBURG, T.; ELMACHLIY, S.; TEL-OR, E.; GEDANKEN*, A.; J. Phys. Chem.
Nanoparticles of YAG were prepared by sonochemistry and by microwave radiation. In both cases, the last stage of the preparation was annealing at a high temperature, which led to a highly aggregated product. To reduce the aggregation we have added k-carrageenan (a sugar) to the reaction mixture. The effect of the sugar is presented and discussed herein.
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