METHOD FOR OBTAINING NANOPARTICLES THROUGH REACTION IN OIL-IN-WATER-TYPE MICROEMULSIONS

摘要

The invention relates to a method for obtaining wholly or partially metallic nanoparticles through reaction in oil-in-water (o/w)-type microemulsions, comprising the following steps: (a) preparation of the microemulsion, comprising the mixing of suitable proportions of different components, namely surfactant(s), the oil phase (containing organometallic precursor(s)) and the aqueous phase, and homogenising the mixture by means of light mechanical action at a temperature suitable for the reaction and (b) addition of one of the following types of agents depending on whether metallic or partially metallic nanoparticles are being prepared, namely a reducing agent, e.g sodium tetrahydroborate (NaBH4), hydrazine or hydrogen (g), or an oxidizing agent, e.g. hydrogen peroxide, or a precipitating agent, e.g. a hydroxide, an oxalate, a sulphate or sulphide salt, etc.