Iron Oxide Nanoparticles
Overview
Iron oxide nanoparticles are engineered particles typically ranging from 1 to 100 nanometers in diameter, existing primarily as hematite (Fe2O3) or magnetite (Fe3O4). Their nanoscale dimensions confer unique properties like superparamagnetism, making them indispensable in advanced technologies. Synthesized via co-precipitation, thermal decomposition, or sol-gel methods, these particles are subject to stringent size and surface chemistry controls for specialized applications. In B2B markets, they are supplied as dry powders or colloidal suspensions, often with surface modifications (e.g., silica coating) to enhance stability. Regulatory bodies such as the FDA and EMA have approved specific grades for biomedical use, underscoring their safety profile when handled correctly.
Physical and Chemical Properties
The magnetic behavior of iron oxide nanoparticles is size-dependent: particles below ~20 nm exhibit superparamagnetism (no residual magnetization), critical for MRI contrast agents. Their high surface-to-volume ratio enhances catalytic efficiency, enabling uses in Fenton reactions for pollutant degradation. Fe3O4 shows higher conductivity and magnetic saturation than Fe2O3, favoring applications in electronics. Surface chemistry is tunable via carboxyl, amine, or polymer coatings (e.g., dextran), which improve dispersion in aqueous or organic media. Thermogravimetric analysis (TGA) typically reveals weight loss at 200–400°C due to organic coatings. X-ray diffraction (XRD) patterns confirm crystalline phases, with characteristic peaks at 30.1° (220) and 35.5° (311) for magnetite.
Main Applications
In biomedicine, Fe3O4 nanoparticles functionalized with antibodies serve as targeted drug carriers for cancer therapy, exploiting magnetic guidance. They are also FDA-approved as T2 contrast agents (e.g., Ferumoxytol) for liver and lymph node imaging. Environmental applications include heavy metal adsorption (e.g., arsenic removal) due to their high affinity for cationic species. Industrially, they act as catalysts in ammonia synthesis (Fe2O3) and Fischer-Tropsch processes. In data storage, their high coercivity allows dense magnetic recording. Emerging uses include hyperthermia treatment (AC magnetic field-induced heating) and as additives in lithium-ion battery anodes to enhance conductivity.
Safety and Storage
While generally low-toxicity, nanoparticle dust requires handling in fume hoods with PPE (gloves, goggles). Material Safety Data Sheets (MSDS) classify them as irritants (GHS07). Long-term storage demands inert atmospheres (argon) for uncoated particles to prevent oxidation. Aqueous suspensions may require preservatives (e.g., sodium azide 0.1%) to inhibit microbial growth. Disposal follows hazardous waste guidelines (EPA 40 CFR 261) for heavy metals. Spills should be contained with absorbent materials (vermiculite) and never washed into drains. Transport regulations (UN3077) mandate labeling as environmentally hazardous solids for quantities exceeding 1 kg.
B2B Procurement Guide
Key specifications include: particle size distribution (DLS or TEM data), zeta potential (±30 mV for stable colloids), and endotoxin levels (<0.25 EU/mL for injectables). Suppliers often provide XRD purity certificates and cytotoxicity reports (ISO 10993-5). Bulk orders (100+ kg) may qualify for 15–20% discounts. Leading manufacturers include US Research Nanomaterials, Sigma-Aldrich, and Nanostructured & Amorphous Materials. For custom coatings (e.g., gold shell), MOQs start at 50g with 6–8 week lead times. Spot prices fluctuate with iron ore market trends; contracts with quarterly price adjustments are advisable for large-volume buyers.
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