Iron Oxide–Silica Core-Shell Powder (Fe3O4@SiO2)
Fe3O4@SiO2 powder is the standard route for stabilizing magnetic nanoparticles: the silica shell protects the magnetic core chemically while giving an easily functionalized surface for downstream chemistry.
~20-30 nm shellCoating Content
~100-130 nmParticle Size Range
Custom Made-to-OrderGrade, Size & Quantity
WorldwideExport Shipping
Iron Oxide–Silica Core-Shell Powder — Grades & Specifications
Iron Oxide–Silica Core-Shell Powder (Fe3O4@SiO2) powder is supplied across a range of grades, particle sizes and coating ratios. The options below are typical; specify your target values in the request form and we will confirm availability, lead time and pricing.
| Material | Iron Oxide–Silica Core-Shell Powder (Fe3O4@SiO2) |
|---|---|
| Category | Ceramic/Oxide-Coated Powder |
| Core material | Magnetite (iron oxide) (CAS 1317-61-9) |
| Coating / shell material | Silicon dioxide (silica) (CAS 7631-86-9) |
| Coating content | Shell thickness commonly around 20-30 nm on an 80-100 nm core, tunable via sol-gel coating |
| Particle size | Core approximately 80-100 nm, total particle roughly 100-130 nm on commercial grade |
| Morphology | Spherical core-shell structure |
| Appearance | Black powder |
| Chemical Stabilization | The silica shell chemically isolates the magnetite core from oxidative degradation and provides a hydroxyl-rich surface for straightforward silane functionalization |
| Typical applications | Magnetic Drug Delivery & Controlled Release, Bioseparation & Immunoassay Supports, Water & Wastewater Treatment Adsorbents, Catalyst Supports & Recoverable Catalysts |
Applications by Industry
Magnetic Drug Delivery & Controlled ReleaseSilica shell enables surface functionalization for targeted or magnetic-field-triggered drug release.
Bioseparation & Immunoassay SupportsMagnetically recoverable, chemically stable substrate for antibody or protein immobilization.
Water & Wastewater Treatment AdsorbentsMagnetically separable silica-coated sorbent for heavy metal or dye removal.
Catalyst Supports & Recoverable CatalystsSilica surface anchors catalytic groups while the magnetic core allows easy recovery and reuse.
MRI Contrast Agent PrecursorsBiocompatible, surface-modifiable magnetic core for imaging agent development.
Magnetic Fluids & FerrofluidsStabilized dispersions for sealing, damping and heat-transfer applications.
Particle Size & Mesh Conversion
Reference for converting between US mesh and microns/millimetres. Figures are nominal sieve openings and may vary slightly by standard.
| Mesh (US) | Micron (µm) | mm | Inch | Remarks |
|---|---|---|---|---|
| 3 | 6730 | 6.730 | 0.2650 | |
| 4 | 4760 | 4.760 | 0.1870 | |
| 5 | 4000 | 4.000 | 0.1570 | |
| 6 | 3360 | 3.360 | 0.1320 | |
| 7 | 2830 | 2.830 | 0.1110 | |
| 8 | 2380 | 2.380 | 0.0937 | |
| 10 | 2000 | 2.000 | 0.0787 | |
| 12 | 1680 | 1.680 | 0.0661 | |
| 14 | 1410 | 1.410 | 0.0555 | |
| 16 | 1190 | 1.190 | 0.0469 | |
| 18 | 1000 | 1.000 | 0.0394 | |
| 20 | 841 | 0.841 | 0.0331 | |
| 25 | 707 | 0.707 | 0.0278 | |
| 30 | 595 | 0.595 | 0.0234 | |
| 35 | 500 | 0.500 | 0.0197 | |
| 40 | 420 | 0.420 | 0.0165 | |
| 45 | 354 | 0.354 | 0.0138 | |
| 50 | 297 | 0.297 | 0.0117 | |
| 60 | 250 | 0.250 | 0.0098 | |
| 70 | 210 | 0.210 | 0.0083 | |
| 80 | 177 | 0.177 | 0.0070 | |
| 100 | 149 | 0.149 | 0.0059 | |
| 120 | 125 | 0.125 | 0.0049 | |
| 140 | 105 | 0.105 | 0.0041 | |
| — | 100 | 0.100 | 0.0039 | Sand |
| 170 | 88 | 0.088 | 0.0035 | |
| 200 | 74 | 0.074 | 0.0029 | |
| — | 70 | 0.070 | 0.0027 | |
| 230 | 63 | 0.063 | 0.0024 | Human hair |
| — | 55 | 0.055 | 0.00217 | |
| 270 | 53 | 0.053 | 0.0021 | |
| — | 50 | 0.050 | 0.00197 | |
| 325 | 44 | 0.044 | 0.0017 | |
| — | 40 | 0.040 | 0.00157 | |
| 400 | 37 | 0.037 | 0.0015 | |
| 550 | 25 | 0.025 | 0.00099 | |
| 625 | 20 | 0.020 | 0.00079 | |
| 1200 | 12 | 0.012 | 0.0005 | |
| 1250 | 10 | 0.010 | 0.000394 | |
| — | 7 | 0.007 | 0.000276 | |
| 2500 | 5 | 0.005 | 0.000197 | |
| 4800 | 3 | 0.003 | 0.000118 | |
| 5000 | 2.5 | 0.0025 | 0.000099 | Bacteria (approx.) |
| 12000 | 1 | 0.001 | 0.0000394 |
Information Required for Quotation
- Grade or type
- Particle size (micron or mesh)
- Coating content / core-shell ratio
- Quantity
- Application environment
- Required delivery country
Lead time depends on grade, particle size, quantity and processing requirements. Export availability can be reviewed based on destination country and material type. A Certificate of Analysis can be provided on request.
Request a Quote or Custom Order
Tell us your grade, particle size and quantity. We typically reply within one business day.
Frequently Asked Questions
What is the coating content of Iron Oxide–Silica Core-Shell Powder?
Shell thickness commonly around 20-30 nm on an 80-100 nm core, tunable via sol-gel coating Other coating ratios can be reviewed on request depending on your application and quantity.
What particle sizes can you supply?
Core approximately 80-100 nm, total particle roughly 100-130 nm on commercial grade Mesh-based requirements are also accepted; a mesh-to-micron conversion reference is provided on the page.
Can Iron Oxide–Silica Core-Shell Powder be made to custom specifications?
Yes. Iron Oxide–Silica Core-Shell Powder is produced to order — core/shell ratio, particle size, morphology and packaging can be customized to your specification. Select “Custom Order” in the request form and provide your target values.
What is the minimum order quantity (MOQ)?
Order quantity is flexible and small quantities and prototype requests are welcome. Please state your required quantity in the form for an accurate quotation.
Can you export and ship Iron Oxide–Silica Core-Shell Powder internationally?
Yes, export inquiries are welcome. Availability and shipping are reviewed based on destination country, grade and quantity.
Do you provide a Certificate of Analysis (COA) or technical data?
A Certificate of Analysis and technical data can be provided on request for supplied lots.
Related Products
Request a Quote for Iron Oxide–Silica Core-Shell Powder
Send us your grade, particle size, quantity and application. We will review availability, quotation and lead time. Small quantities, prototypes and custom made-to-order specifications are welcome.