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747254 Sigma-Aldrich

Iron oxide(II,III), magnetic nanoparticles solution

10 nm avg. part. size (TEM), carboxylic acid functionalized, 5 mg/mL Fe in H2O, dispersion

Synonym: Fe NP COOH, FexOy, Magnetic iron oxide nanocrystals, Magnetite, Superparamagnetic iron oxide nanoparticles

  • CAS Number 1317-61-9

  • Empirical Formula (Hill Notation) Fe3O4

  • Molecular Weight 231.53

  •  MDL number MFCD00011010

  •  PubChem Substance ID 329765820

  •  NACRES NA.23



Related Categories 26: Fe, Biomedical Materials, Iron Oxide Nanoparticles, Magnetic Materials, Materials Science,
form   dispersion
concentration   5 mg/mL Fe in H2O
magnetization   >45 emu/g, at room temperature; under 4500 Oe
color   brown
avg. part. size   10 nm (TEM)
density   ~1 g/mL at 25 °C
functional group   carboxylic acid
storage temp.   2-8°C
SMILES string   O=[Fe].O=[Fe]O[Fe]=O
InChI   1S/3Fe.4O


General description

Concentration 5mg/ml includes total weight nanocrystals plus ligands.


These magnetic nanoparticles are typically used in imaging or as contrast agents. The surface functionality allows for different ligation or further functionalization.

Legal Information

Product of Ocean Nanotech; LLC.

Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 


Certificate of Analysis (COA)

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Certificate of Origin (COO)

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Protocols & Articles


Iron Oxide Nanoparticles, Characteristics and Applications

Iron oxides are common natural compounds and can also easily be synthesized in the laboratory. There are 16 iron oxides, including oxides, hydroxides, and oxide-hydroxides. These minerals are a resul...
Alice Bu
Partner and Operations Manager, Ocean NanoTech LLC
Keywords: Bacterial conjugations, Cancer, Ligands, Magnetic resonance imaging

Magnetic Nanoparticles for Cancer Theranostics

Saumya Nigam,1 Lina Pradhan,2 and D. Bahadur*3 1IITB-Monash Research Academy, IIT Bombay, Powai, Mumbai, India 2Centre for Research in Nanotechnology & Science IIT Bombay, Powai, Mumbai, India 3Depar...
Keywords: Apoptosis, Bacterial conjugations, Cancer, Diagnostic, Magnetic resonance imaging, Materials Science, Nanomaterials, Nanotechnology, Reductions

Micro- and Nanofabricated Biomaterials for the Study of Cells and Microtissues

Phin Peng Lee, Karen E. Samy, Miquella G. Chavez, Alec Cerchiari, Tejal A. Desai* Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA 9415...
Keywords: Absorption, Adhesion, Amplification, Apoptosis, Biomaterials, Cancer, Cell culture, Cell proliferation, Diffusion, Immobilization, Indicators, Infrared spectroscopy, Ligands, Magnetic resonance imaging, Materials Science, Microscopy, Molecular biology, Nanotechnology, Semiconductor, Solvents

Smart Nanofiber Meshes as a Local Drug Delivery Platform

1 International Center for Materials Nanoarchitectonics (WPIMANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
Keywords: Apoptosis, Bacterial conjugations, Biomaterials, Cancer, Ceramics, Clinical, Diseases, Environmental, Materials Science, Nanotechnology, Nanotubes, Polymerization reactions, Reductions, Ring-opening polymerization, Separation, Vitamins

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

Peer-Reviewed Papers


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