Water-soluble silver micro/nano crystal and controllable preparation method thereof

Abstract

The invention provides a water-soluble silver micro / nano crystal and a controllable preparation method thereof, and relates to the technical field of silver micro / nano crystal preparation. The methodincludes the two processes of preparation of a reaction precursor solution and a rapid reduction reaction at room temperature. Firstly, a silver nitrate solution is prepared, then ascorbic acid (VC) solids are added into the silver nitrate solution, and finally the water-soluble silver micro / nano crystal is obtained through the rapid reduction reaction at room temperature; and a water solution ofa surfactant can be added when the silver nitrate solution is prepared. The prepared Ag micro / nano crystal is a micro-crystal composed of countless Ag nano particles, and a quasi-spherical Ag micro / nano crystal (no surfactant is added), a dendrite Ag micro / nano crystal (Blue Moon liquid soap LYL is adopted as the surfactant) and a particle-chain-shaped Ag micro / nano crystals (stearic acid micro-emulsion ALA is adopted as the surfactant) can be obtained separately by changing the varieties and the use quantities of surfactants. The obtained product is good in water solubility, dispersity and stability and is expected to be used for the waterborne anti-bacterial coating production industry.

Description

technical field [0001] The invention relates to the technical field of silver micro-nano crystal preparation, in particular to a water-soluble silver micro-nano crystal and a controllable preparation method thereof. Background technique [0002] Water-soluble Ag nanopowders play a key role in the production of antibacterial coatings. Silver (Ag) micro-nanocrystals are widely used in surface plasmon resonance, surface-enhanced Raman scattering and antibacterial due to their excellent optical, catalytic and antibacterial properties. The unique properties of Ag nanocrystals are determined by their size and shape, so the synthesis of silver nanocrystals with different sizes and shapes, such as spheres, cubes, triangular prisms, flakes, rods, and wires, has attracted much attention. silver nanocrystals. [0003] Many reported forms of Ag nanocrystals are usually in organic phases such as chloroform and formamide, and PVP, SDS and CTAB are used as modifiers to control the morpho...

AI Technical Summary

Problems solved by technology

Although this method has good repeatability and controllable morphology, the surface of Ag nanocrystals obtained by this method is often coated with organic ligands and has poor water solubility, which greatly limits its practical application in biomedicine, catalysis, and water-based functional coatings. application

However, Ag nanocrystals synthesized in aqueous phase with reducing agents such as sodium borohydride, ascorbic acid, and sodium citrate have small size, poor dispersion, and easy oxidation.

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