A method for preparing monodisperse nano oxide particles

Abstract

The invention discloses a method for preparing monodisperse oxide nanoparticles. The method comprises the steps of firstly, preparing hydrosol containing a soluble salt and a nano-oxide precursor, then, mixing the hydrosol with a low-polarity solvent so as to precipitate the soluble salt in a superfine nanoparticle state and co-precipitate the soluble salt with nano-oxide precursor particles, subjecting the co-precipitate to centrifugation, washing and drying, carrying out calcination at a temperature below the boiling point of the salt so as to convert the nano-oxide precursor into a nano oxide, washing off the soluble salt, and carrying out drying, thereby obtaining the monodisperse oxide nanoparticles. During the preparation, the soluble salt exerts an isolating action, and the precursor nanoparticles or oxide nanoparticles can be effectively prevented from agglomeration and sintering in a high-temperature calcination process. According to the method, the temperature range for preparing monodisperse nano-oxides is widened greatly, and the process is simple and convenient and is low in cost.

Description

technical field [0001] The invention belongs to the field of nano material preparation and relates to a method for preparing monodisperse nano oxide particles. Background technique [0002] Nano oxide particles generally refer to ultrafine oxide particles with a size between 1-100 nm. Due to the quantum size effect, volume effect, surface effect and tunnel effect, nano-oxides have very unique properties in thermal, optical, electrical, magnetic and chemical aspects, so they are widely used. [0003] The preparation methods of nano-oxide particles include sol-gel method, chemical precipitation method, microemulsion method, hydrothermal method, spray pyrolysis method, etc. The basic process of these preparation methods is to first prepare the oxide precursor, and then make the precursor The body is calcined and decomposed at high temperature to obtain nano-oxides. During the preparation of nano-oxides, it is difficult to solve the problem of agglomeration and sintering of na...

AI Technical Summary

Problems solved by technology

This method also has the disadvantages of high cost of raw materials and low yield, while the azeotropic distillation process is complicated, the distillation temperature is high, and the stability of the microemulsion is difficult to guarantee

[0005] In summary, the use of soluble salt isolation is a possible way to solve the problem of high-temperature sintering of nanoparticles and prepare monodisperse nano-oxide particles, but the existing soluble salt isolation technology has disadvantages such as complex process, high cost, and low yield.