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20 nm Silica Nanospheres

Product Number


  • Unagglomerated and monodisperse
  • Mean diameter: 20 nm ± 4 nm
  • Size distribution (CV) < 15%
  • Silica mass concentration of 5 mg/mL
  • Standard particles provided in water; aminated particles provided in ethanol

Product Lines

Tight Size
Wide Variety
of Surfaces
Guaranteed Sterile
& Endotoxin-Free
Learn more +
(certain products)

(certain products)
  • Monodisperse and unagglomerated
  • Standard colloidal concentration
  • Seven standard surfaces (citrate, tannic, PVP, lipoic acid, PEG, BPEI, silica)

Which Surface Should I Choose?

Surface Displaceable Salt
Stable in
Stable in
Stable in
Polar Organics
Stable in
Non-Polar Organics
Conjugatable Charge
at pH 7
Silica Learn more +
  • Increased particle stability in a wide range of solvents
  • Versatile conjugation surface for attaching functional groups or creating hydrophobic or fluorophillic surfaces
  • Nanoporous structure allows low molecular weight molecules to be loaded into the shell
Amine-Functionalized Silica Learn more +
  • Positively charged silica colloids and silica-coated nanoparticles
  • Useful for binding studies, conjugation with carboxyl-containing molecules through EDAC coupling, or binding to dyes and molecules with isothiocyanate (ITC) or amine-reactive esters
  • Many custom coatings are available to provide specific functionality at the particle surface or create particles compatible with different solvents or composites
  • Contact us to discuss your application and custom surface functionalization needs

Certificate of Analysis Examples

Please note that these are representative Certificates of Analyses (CoAs) provided as examples for this product. We provide a unique batch-specific CoA with each product during shipment; only the CoA that arrives with your product should be referred to for actual characterization and measurement data. If you would like an electronic copy of the CoA for the product you received or the material(s) we currently have in stock, please contact us.

Product Line Surface Example Certificate of Analysis Product # Price
N NanoXact, 5 mg/mL Standard Download ↓ SISN20-10M $105+
N NanoXact, 5 mg/mL Standard Download ↓ SISN20-25M $240+
N NanoXact, 5 mg/mL Standard Download ↓ SISN20-50M $410+
N NanoXact, 5 mg/mL Standard Download ↓ SISN20-100M $770+
N NanoXact, 5 mg/mL Aminated Download ↓ SIAN20-10M $120+
N NanoXact, 5 mg/mL Aminated Download ↓ SIAN20-25M $270+
N NanoXact, 5 mg/mL Aminated Download ↓ SIAN20-50M $465+
N NanoXact, 5 mg/mL Aminated Download ↓ SIAN20-100M $870+

Need help reading our Certificates of Analysis? +