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Iron oxide Fe3O4 is a substance inorganic with a chemical composition of Fe3O4. The magnetic black crystal is called magnetic iron dioxide.

Iron Oxide Fe3O4 Powder Properties

Ferric oxide cannot be dissolved in organic solvents, such as water or alkali solutions. Natural ferroferric dioxide is not soluble when mixed with acid and will easily oxidize to iron oxide (Fe2O3) if the air is humid.
The black Fe3O4 is an iron oxide with mixed valence, melting at 1597degC. It has a density of 5,18g/cm3. Fe3O4 Powder is insoluble with water but soluble with acid solutions. At room temperature, it appears as magnetite. It is highly conductible and sub-magnetic.

Fe3O4 exhibits anti-corrosion properties. In the case of bluing steel parts, also known as blue-burning or baking blue, an alkaline-oxidizing solution is used to produce a blue-black film of Fe3O4 on the steel surface. Used to improve corrosion resistance, aesthetics and gloss.

Iron Oxide Fe3O4 Powder Preparation

The main methods used to prepare nano-Fe3O4 are the hydrothermal method (solvothermal), the microemulsification technique, and the sol-gel technique.

1. Precipitation methods
Precipitation, a simple method with low costs, high purity, and uniformity, is ideal for large-scale production. The most common precipitation methods are co-precipitation and hydrolytic precipitation. Ultrasonic precipitation is also used, as well as alkoxide hydrogenation and chelate breakdown.

2. Hydrothermal (solvothermal method)
The hydrothermal reaction (solvothermal reaction) is a term used to describe a chemical reaction that takes place under high pressure and temperature in aqueous fluids (organic solubles) or steam. The Fe3O4 obtained by hydrothermal means has a very small particle, a particle size that is relatively uniform, and does not need high-temperature pretreatment.

3. Microemulsification method
The microemulsification technique is a method of forming an emulsion from two immiscible solutions under the influence of surfactants. In this process, amphiphilic molecule divides the medium into microreactors, where the reactants are able to react and form a solid. The microreactor limits the nucleation, growth of crystals, coalescence and agglomeration processes, resulting in nanoparticles which are covered with surfactant, have a condensed morphology and structure.

4. Sol-gel method
The method is based on the hydrolysis of metal alkoxides, followed by polymerization to produce a uniform sol containing metal oxides or hydroxides. They are then concentrated into a clear gel. The gel is dried, and then heat-treated in order to obtain superfine powder.

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