A kind of ferroferrofluid preparation method

Abstract

The invention discloses a method for preparing ferroferromagnetic fluid, comprising: a. Mixing of raw materials: putting FeCl2 4H2O and FeCl3 6H2O into reaction equipment for mixing, adding a certain amount of water and mixing the mixed solution, and mixing The mixed solution is filtered to remove impurities in the solution; b, the reaction is carried out: add ammoniacal liquor to the mixed solution to generate Fe3O4 colloidal bodies in the solution, continue to add ammoniacal liquor until Fe3O4 no longer generates, stop feeding ammoniacal liquor; c , heating: add activator oleic acid and base liquid kerosene in Fe3O4 colloid, it is heated, to remove excessive ammoniacal liquor; d, take material: leave standstill solution for a certain period of time, make solution produce layering phenomenon, the water layer of lower layer Pumped away, then the kerosene-based magnetic fluid of the upper Fe3O4 is collected.

Description

technical field [0001] The invention belongs to the technical field of fluids containing magnetic particles, and in particular relates to a method for preparing ferroferromagnetic fluid. Background technique [0002] Magnetic fluid, also known as magnetic liquid, ferrofluid or ferrofluid, is a new type of functional material, which has both the fluidity of liquid and the magnetism of solid magnetic materials. It is a stable colloidal liquid composed of magnetic solid particles with a diameter of nanometers (less than 10 nanometers), a base carrier liquid (also called a medium) and a surfactant. The fluid has no magnetic attraction when it is static, and it shows magnetism when an external magnetic field is applied. Because of this, it has a wide range of applications in practice and has high academic value in theory. The magnetic fluid produced with nano-metal and alloy powder has excellent performance, and can be widely used in various harsh conditions of magnetic fluid se...

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Problems solved by technology

[0003] There are many ways to prepare magnetic fluid. Among the existing methods, there is a method for preparing magnetic fluid by using FeCl2 4H2O and FeCl3 6H2O. Since this method involves multiple steps, the reactant moves between multiple containers, and the reactant moves on the inner wall of the container. There are still some reactants left on the surface, resulting in the waste of reactants, and the constant transportation of reactants affects the reaction rate of reactants, thus affecting the efficiency of magnetic fluid preparation.

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