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Fe3O4 is an inorganic material 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 ethanol, water, or alkali solutions. Natural ferroferric dioxide is not soluble when mixed with acid and can easily be oxidized into 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 not soluble with water but soluble with acid solutions. At room temperature, it appears as magnetite. It has a high conductivity and strong submagnetism.
Fe3O4 exhibits anti-corrosion properties. In the case of bluing steel parts, also known as baking blue and blue-burning, an alkaline oxidizing liquid is used to produce a dark-blue or blue-black Fe3O4 coating on the 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 often used to prepare nanoparticles. This method is also suitable for large-scale manufacturing. 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 chemical processes that are carried out under high pressure and temperature in fluids, such as aqueous (organic) solvents or steam. The Fe3O4 obtained by hydrothermal means has a very small particle, a particle size that is relatively uniform, does not need high temperature calcination, and it can be doped with multivalent ions.
3. Microemulsification method
The microemulsification technique is the process of creating an emulsion using two immiscible solutions under the influence of surfactants. In this method, amphiphilic molecule divides the continuous medium in tiny spaces that form a small reactor, where the reactants are able to react to produce a solid. The microreactor limits the nucleation, growth of crystals, coalescence, agglomeration processes, resulting in nanoparticles which are covered with surfactant, have a condensed morphology, and are wrapped.
4. Sol-gel method
The method is based on the hydrolysis of metal alkoxides and the polymerization to produce a uniform solution of metal hydroxides and metal oxides, which are then concentrated into a clear gel. The gel is dried, and then heat-treated in order to obtain a superfine powder of oxide.
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