Method for synthesizing gold nanoparticles through microemulsion without surfactant

Abstract

The invention relates to a method for synthesizing gold nanoparticles through a microemulsion without a surfactant. The method is characterized by comprising the following preparation steps of (1) uniformly mixing an oil-phase solvent, a water-phase solvent A and double solvents at the normal temperature, and stirring at the normal temperature until the mixed liquor is transparent so as to obtaina microemulsion A, wherein the stirring speed is 20 to 300r / min; (2) uniformly mixing the oil-phase solvent, a water-phase solvent B and double solvents at the normal temperature, and stirring at thenormal temperature until the mixed liquor is clarified so as to obtain a microemulsion B, wherein the stirring speed is 200 to 300r / min; and (3) under the stirring state, slowly dripping the isometricmicroemulsion B into the microemulsion A from a constant-pressure funnel, and continuously stirring for 5 to 15h at 15 DEG C, wherein the dripping speed is 50 to 70 drip / min.

Description

technical field [0001] The present application belongs to the preparation method of precious metals, specifically a method for synthesizing gold nanoparticles from surfactant-free microemulsion. Background technique [0002] In recent years, nano-gold materials of different sizes and shapes have attracted widespread attention from researchers due to their unique physical and chemical properties, and their applications in photoelectricity, catalysis, electronics, biomedicine, environment and analysis have become increasingly important. . The previously reported methods for preparing nano-gold include sodium citrate reduction method, sodium ascorbate reduction method, tannic acid-sodium citrate reduction method, traditional microemulsion method, etc. The traditional microemulsion method has the advantages of simple equipment, mild conditions, particle The advantages of monodispersity and good interface are widely used in the synthesis of nanoparticles. Traditional microemuls...

AI Technical Summary

Problems solved by technology

Traditional microemulsions contain a large amount of surfactants, and the surface of the prepared nanoparticles is often adsorbed with a layer of surfactant molecules. During the application process, the surfactant needs to be removed, which increases the process and cost. However, if the surfactant-free microemulsion ( Surfactant-free Microemulsion, referred to as SFME) can fundamentally solve this problem by preparing nanoparticles.

Images