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• W2002128529 abstract "Abstract Rhenium nanoparticles (Re NPs) were synthesized by simple colloidal and microemulsion methods in aqueous medium under air and inert atmosphere. Colloidal synthesis using PVP as protective agent and NaBH4 as reducing agent led to pseudo-spherical Re NPs with mean size in the range of 0.7–2.8 nm. The effect of the synthesis temperature, the reducing agent addition rate, and the capping and reducing agent to Re ratio on the particle size and particle distribution was studied. In the presence of air, the synthesis at 60 °C provided faster and more complete reduction, however reoxidation was observed once the reducing agent was consumed. The reoxidation was avoided removing the oxygen dissolved in the water medium by bubbling N2 or H2. The increase of the synthesis temperature in the range studied (10–80 °C) resulted in a higher mean particle size and a more heterogeneous particle size distribution. A slower addition rate of the reducing agent produced Re NPs with more homogeneous size, together with some reduction of the mean particle size. An increase in the amount of reducing agent at high temperature, 70–80 °C, resulted in the formation of agglomerates of large size, apparently formed by smaller nanoparticles. The increase of the PVP to Re molar ratio from 10 to 40 resulted in some narrowing of the particle size distribution. The synthesis of Re NPs was also achieved for a water-in-oil microemulsion system (n-heptane/AOT) under inert atmosphere using NaBH4 as reducing agent. The mean size (0.8–1.4 nm) and size distribution of the pseudo-spherical Re nanoparticles were found to be affected mainly by the water to surfactant ratio. Under all the conditions and synthesis procedure tested Re showed a trend to produce rather small nanoparticles in comparison to other metals." @default.
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• W2002128529 date "2015-03-01" @default.
• W2002128529 modified "2023-10-11" @default.
• W2002128529 title "Colloidal and microemulsion synthesis of rhenium nanoparticles in aqueous medium" @default.
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• W2002128529 doi "https://doi.org/10.1016/j.colsurfa.2015.01.031" @default.
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