637106 Sigma-Aldrich

Iron(II,III) oxide

nanopowder, 50-100 nm particle size (SEM), 97% trace metals basis



Related Categories 26: Fe, Biomedical Materials, Iron, Iron Oxide Nanoparticles, Magnetic Materials,
Quality Level   100
assay   97% trace metals basis
form   nanopowder
particle size   50-100 nm (SEM)
surface area   BET surf. area 20-50 m2/g
mp   1538 °C (lit.)
density   4.8-5.1 g/mL at 25 °C (lit.)
bulk density   0.84 g/mL
Featured Industry   Battery Manufacturing
SMILES string   O=[Fe].O=[Fe]O[Fe]=O
InChI   1S/3Fe.4O



Chemical Synthesis of Monodisperse Magnetic Nanoparticles


25, 100, 250 g in glass bottle

Analysis Note

XRD image is representative only; it is not lot specific

Safety & Documentation

Safety Information

Personal Protective Equipment 
NONH for all modes of transport
WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable


Certificate of Analysis (COA)

Please Enter a Lot Number

Certificate of Origin (COO)

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Frequently Asked Questions

Which document(s) contains shelf-life or expiration date information for a given product?
If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.
How do I get lot-specific information or a Certificate of Analysis?
The lot specific COA document can be found by entering the lot number above under the "Documents" section.
Is Product 637106, Iron(II,III) oxide, stabilized (coated)?
No,product 637106has not been coated on the surface per the supplier.
What is the particle sizeof Product 637106, Iron(II,III) oxide?
Average particle sizes are50-100 nm.
How can the nanopowder Iron(II,III) oxide, Product 637106,be dispersed in an aqueous solution?
1. It is recommended to use a neutral buffered solution (approximately pH 7). The pH of the solution is an important factor in achieving a monodispersion of the nanopowder.2. Probe-type ultrasonication is strongly recommended by the manufacturer.3. If the material is not well dispersed by ultrasonication in a neutral buffer, add a surfactant. This will wet the nanoparticle surface. Since the particles are small (less than 50 nm), they have a high surface area to volume ratio. They can therefore absorb gases such as oxygen or carbon dioxide from the air, which would decrease the dispersity of the particles. Degassing the buffer before use may help to eliminate the formation of gas bubbles.
How do I find price and availability?
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What is the Department of Transportation shipping information for this product?
Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product.
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Protocols & Articles


Chemical Synthesis of Monodisperse Magnetic Nanoparticles

Magnetic nanoparticles have attracted tremendous attention due to their novel properties and their potential applications in magnetic recording, magnetic energy storage and biomedicine.1-3 Thanks to ...
Sheng Peng, Shouheng Sun
Material Matters 2009, 4.1, 14.
Keywords: Applications, Chemical vapor deposition, Deposition, Diffusion, Magnetic resonance imaging, Magnetic resonance spectroscopy, Mass spectrometry, Methods, Microscopy, Nucleic acid annealing, Oxidations, Precipitation, Reductions, Scanning electron microscopy, Transmission electron microscopy

Functional Magnetic Materials: Synergy Between Basic Science and Evolving Technology

S. B. Roy Materials and Advanced Accelerator Sciences Division Raja Ramanna Centre for Advanced Technology Indore-452013, India Email:
Keywords: Crystallization, Microscopy, Phase transitions, Reductions, transformation

Graphene-Based Composites and their Unique Renewable Energy Applications

Wen Qian, Andrew Y. Wang* Ocean NanoTech, LLC, San Diego, CA 92126, USA *Email:
Keywords: Catalysis, Nanotubes, Oxidations, Purification, Recombination, Reductions, Renewable energy, Semiconductor, Separation

Nanofluids for Biomedical Applications Using Spherical Iron Oxide Magnetic Nanoparticles Fabricated by High-Power Physical Evaporation

A. P. Safronov,1,2 I. V. Beketov,1,2 O. M. Samatov,1 G. V. Kurlyandskaya,2,3,* S. M. Bhagat,4 A. Larrañaga,5 I. Orue,5 R. Andrade5 1Institute of Electrophysics, RAS, Amundsen St. 106, 620016, Ekateri...
Keywords: Absorption, Condensations, Diffraction, Electronics, Evaporation, High performance liquid chromatography, Mass spectrometry, Melting, Microscopy, Oxidations, Potentiometric titrations, Scanning electron microscopy, Separation, Titrations, Transmission electron microscopy, X-Ray diffraction

Recent Developements in Magnetic Iron Oxide Nanoparticles for Non-Invasive Bioimaging

1 Department of Radiology and Imaging Sciences, Emory University School of Medicine, Atlanta, Georgia 30322, USA 2 Ocean Nanotech, LLC, 7964 Arjons Drive, San Diego, California 92126, USA *E-mail: hm...
Keywords: Absorption, Clinical, Diagnostic, Diagnostic Imaging, Diseases, Electron spin resonance, Growth factors, Infrared spectroscopy, Ligands, Magnetic resonance imaging, Microscopy, Microwave synthesis, Nanomaterials, Positron Emission Tomography, Scanning electron microscopy, Transmission electron microscopy

Self-Propagating Reactions Induced by Mechanical Alloying

Mechanical alloying is a “brute force” method of affecting alloying and chemical reactions. The mixture of reactant powders and several balls are placed in the milling jar of a high-energy ball mill,...
Prof. Laszlo Takacs
Material Matters 2007, 2.4, 21.
Keywords: Ceramics, Chemical reactions, Combustion, Diffraction, Exothermic, Mass spectrometry, Metal Science, Oxidations, Reductions, Size-exclusion chromatography, Thermite, X-Ray diffraction, transformation

Soft Magnetic Nanocrystalline Alloys: Materials and Models

Victorino Franco Departamento de Física de la Materia Condensada, ICMSE-CSIC Universidad de Sevilla, P.O. Box 1065, 41080, Sevilla, Spain Email:
Victorino Franco
Material Matters, 2016, 11.4
Keywords: Addition reactions, Crystallization, High performance liquid chromatography, Mass spectrometry, Nucleic acid annealing, Precipitation, Spectroscopy, transformation

Synthesis and Application of Shape-Controlled Fe3O4 Nanostructures

Magnetite (Fe3O4) nanocrystals have extensive applications in drug and gene delivery,1 field-directed assembly,2 energy storage,3 and catalysis4 due to their excellent magnetic properties, ready avai...
Keywords: Absorption, Cancer, Diffraction, Ligands, Magnetic resonance imaging, Microscopy, Nanomaterials, Nucleic acid annealing, Reductions, Scanning electron microscopy, Solvents, Sonication, Transmission electron microscopy, transformation

Synthesis of Magnetic Nanoparticles for Biosensing

Department of Chemistry and the Texas Center for Superconductivity, University of Houston, 4800 Calhoun Road, Houston, Texas 77204-5003, United States *E-mail:
Keywords: Catalysis, Diffraction, Immobilization, Ligands, Mass spectrometry, Microscopy, Nanomaterials, Nuclear magnetic resonance spectroscopy, Precipitation, Sample preparations, Scanning electron microscopy, Spectroscopy, Transmission electron microscopy, X-Ray diffraction

Peer-Reviewed Papers


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