Paramagnetic Iron Oxide
Overview
Paramagnetic Iron Oxide refers to iron oxide nanoparticles or bulk materials exhibiting paramagnetic or superparamagnetic behavior. Unlike ferromagnetic materials, these oxides only magnetize under an external magnetic field, making them ideal for reversible applications. The most common forms are magnetite (Fe3O4) and maghemite (γ-Fe2O3), both of which are extensively studied for their unique magnetic and surface properties. These materials are synthesized through methods like coprecipitation, thermal decomposition, or hydrothermal processes, with strict control over particle size and crystallinity. Their biocompatibility and tunable magnetic response have driven significant interest in medical and technological fields, particularly as contrast agents in magnetic resonance imaging (MRI) and components in advanced electronics.
Physical and Chemical Properties
Paramagnetic Iron Oxide nanoparticles typically range from 5–100 nm in diameter, with surface area and magnetic susceptibility highly dependent on synthesis conditions. Magnetite (Fe3O4) has an inverse spinel structure, enabling high electron transfer efficiency, while maghemite (γ-Fe2O3) is a defect spinel with similar properties but higher oxidative stability. The materials exhibit negligible remanence or coercivity, meaning they lose magnetization when the external field is removed—a critical feature for applications like targeted drug delivery. Their surfaces can be functionalized with polymers, silica, or biomolecules to enhance dispersibility or enable conjugation. Chemically, they are stable in neutral pH but dissolve slowly in acidic environments, releasing iron ions.
Main Applications
In biomedicine, Paramagnetic Iron Oxide nanoparticles are pivotal as MRI contrast agents, particularly for liver and lymph node imaging. Their superparamagnetism enhances image resolution without residual magnetization risks. They also serve as carriers in magnetic hyperthermia cancer therapy and targeted drug delivery systems. Industrial uses include magnetic recording media, ferrofluids for sealing and damping, and environmental remediation (e.g., heavy metal adsorption). In electronics, they are incorporated into sensors and spintronic devices due to their tunable conductivity and magnetic responses. Emerging research explores their role in energy storage, such as lithium-ion battery anodes.
Safety and Storage
While generally low in toxicity, inhalation of fine powder may cause respiratory irritation. Proper personal protective equipment (PPE), including masks and gloves, is recommended during handling. Storage requires airtight containers in dry, cool environments to prevent oxidation or moisture-induced aggregation. For biomedical grades, endotoxin testing and sterility are critical. Disposal should follow local regulations for metal oxides, with options for recycling iron content. Note that surface coatings (e.g., dextran, polyethylene glycol) may alter biocompatibility and require separate safety assessments.
B2B Procurement Guide
Buyers should prioritize suppliers offering certificates of analysis (CoA) detailing purity, particle size distribution (PSD), and magnetic properties (e.g., saturation magnetization). For biomedical applications, request biocompatibility data (ISO 10993) and endotoxin levels (<0.25 EU/mL). Pricing varies significantly: uncoated technical-grade powders start at ~$50/kg, while functionalized nanoparticles for medical use may exceed $500/kg. Bulk purchases (10+ kg) often qualify for discounts. Lead times depend on customization; standard products ship within 2–4 weeks. Key global suppliers include Sigma-Aldrich, US Research Nanomaterials, and Nanografi.
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