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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 water or alkali solutions. The ferroferric acid is not soluble and easily oxidized into iron oxide (Fe2O3) when 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 oxidation solution is used to produce a dark-blue or blue-black Fe3O4 coating on the steel surface. Used to improve corrosion resistance, aesthetics and gloss.
Iron Oxide Fe3O4 Powder Preparation
Traditional methods include microemulsification (solvothermal), precipitation, hydrothermal method and sol-gel.
1. Precipitation methods
The precipitation process is widely used to prepare nanoparticles because it is easy, inexpensive, yields a high purity product, has a uniform composition, is suitable for mass production, and can be done at large scale. 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)
Hydrothermal reaction (solvothermal reaction) is the general term used for chemical reactions which are carried out under high pressure and temperature in fluids, such as aqueous (organic) solvents or steam. The Fe3O4 obtained by the hydrothermal process has a particle size that is small and uniform, it does not need high-temperature pretreatment to calcinate, and it can be doped with multivalent ions.
3. Microemulsification method
The microemulsification technique is used to create 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 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 a superfine powder of oxide.
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