Overview
Superparamagnetic Iron Oxide (SPIO) nanoparticles are a class of iron oxide materials (typically magnetite or maghemite) with diameters below 20 nm, exhibiting superparamagnetism—a state where particles show magnetic behavior only under an external magnetic field. This property prevents agglomeration after field removal, making SPIO ideal for biomedical and industrial applications. First synthesized in the 1980s, SPIO gained prominence in MRI contrast enhancement due to its ability to shorten T2 relaxation times. Modern synthesis methods include co-precipitation, thermal decomposition, and microemulsion, each yielding particles with tailored sizes and surface functionalities.
Physical and Chemical Properties
SPIO nanoparticles display unique magnetic properties due to their small size and single-domain structure. Their saturation magnetization ranges from 60–90 emu/g (Fe₃O₄), significantly higher than bulk iron oxide. Surface coatings (e.g., dextran, silica) enhance colloidal stability and biocompatibility. Chemically, SPIO is stable under physiological conditions but oxidizes slowly to γ-Fe₂O₃ in air. It dissolves in strong acids, releasing Fe²⁺/Fe³⁺ ions. The particles’ high surface-area-to-volume ratio enables efficient functionalization for targeted applications, such as antibody conjugation for cancer diagnosis.
Main Applications
In biomedicine, SPIO is used as MRI contrast agents (e.g., Ferumoxides for liver imaging) and in magnetic hyperthermia cancer therapy. Its superparamagnetism allows precise localization under magnetic fields, enabling targeted drug delivery systems. Industrial applications include wastewater treatment, where SPIO adsorbs heavy metals (e.g., arsenic) and is magnetically separated. SPIO also serves as a catalyst in Fenton reactions for organic pollutant degradation. Emerging uses include data storage and flexible electronics due to its tunable magnetic response.
Safety and Storage
Uncoated SPIO nanoparticles pose inhalation risks; handle with NIOSH-approved respirators and gloves. Store in sealed containers under argon or nitrogen to prevent oxidation. For biomedical grades, endotoxin-free coatings are critical to avoid immune reactions. Disposal follows hazardous waste regulations for metal oxides. SPIO for medical use must meet FDA/EMA purity standards (e.g., USP <232> for elemental impurities). Stability testing under intended storage conditions (e.g., 2–8°C for some formulations) is mandatory.
B2B Procurement Guide
Specify core parameters: particle size (5–50 nm), polydispersity index (<0.2), coating type (PEG, citrate), and magnetization value. Biomedical buyers should request endotoxin levels (<0.25 EU/mg) and sterility certificates. Suppliers include Sigma-Aldrich, Nanocs, and Ocean NanoTech. Bulk orders (10+ kg) may reduce costs by 20–30%. Lead times vary from 2 weeks (stock items) to 8 weeks (custom formulations). Negotiate testing protocols (DLS, TEM, VSM) for quality assurance.
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