Preparation and separation method of monodisperse amorphous state nickel nano particle

Abstract

A method for preparing and separating monodisperse amorphous nickel nanoparticles comprises the following steps: taking acetylacetone nickel as a raw material; taking whiteruss as a reaction medium; taking trioctyl phosphine and oleylamine as stabilizing agents (or: protective solutes, surface modifying agents); taking an organic ferric compound as a catalyzer; taking polylol as a morphological modifying agent; mixing the above substances in a kettle-type reactor according to a certain ratio; heating the substances with hydrogen to the reaction temperature (150 to 350 DEG C); reacting for 3 hours; obtaining amorphous nickel nanoparticles; and adopting an external applied magnetic field to assist the solvent fractionating method, so as to separate the nickel nanoparticles from the reaction system. The powdery monodisperse amorphous nickel nanoparticles can once again disperse into organic solvents such as chloroform, sherwood oil, etc. without sedimentation.

Description

technical field [0001] The invention relates to a method for preparing and separating monodisperse amorphous nickel nanoparticles, which belongs to the improvement and innovation of the method for preparing and separating magnetic nanoscale materials. The monodisperse superparamagnetic amorphous nickel nanoparticles prepared by the method can be completely dissolved in polar and nonpolar organic solvents. Background technique [0002] Because amorphous nickel has high catalytic activity and magnetic properties at the same time, as a new generation of catalyst, the preparation and application of amorphous nickel has been paid more and more attention. Amorphous nano-nickel has higher catalytic activity and larger specific surface area than amorphous nickel bulk materials. At present, the methods for preparing ultrafine metal powder mainly include: grinding method, solid phase reaction method, vapor phase deposition method, aqueous solution electrolysis method, aqueous solutio...

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Problems solved by technology

There are following defects in the preparation method with nickel carbonyl as raw material: (1) nickel carbonyl is poisonous, and decomposition temperature is low, and storage and transportation are very inconvenient

However, when the nanoparticles are exposed to ethanol in large quantities, the stabilizer molecules will fall off from the surface of the nanoparticles, which will cause the aggregation of the nanoparticles.

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