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Silica Nanoparticles

Colloidal silica (silicon dioxide) nanoparticles are amorphous materials and are generally spherical in shape. They can be made to have a broad range of sizes and their surface chemistry easily modified to target a variety of applications. Regardless of size, dried silica nanoparticles are a white powder. In their nonporous form, silica nanoparticles are known for being absorbent and abrasive, whereas mesoporous silica nanoparticles have important applications in drug delivery and nanomedicine.

Solid Silica Spheres

Silica nanospheres in water, ranging from 20-1000 nm with silanol or aminated surfaces.
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Mesoporous Silica

Mesoporous silica nanoparticles with hexagonal pore structure and 100 nm diameter.
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Silica Shelled Gold

Gold nanosphere cores of 20 nm, 50 nm, and 100 nm with 20 nm silica shells to enhance particle robustness and stability in a wide range of solvents. 
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Silica Shelled Silver

Silver nanospheres and nanoplates of various dimensions with silica shells to enhance particle robustness and stability in a wide range of solvents.
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Need a size, shape, surface, or concentration that we don’t offer?
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Why Purchase From nanoComposix?

Satisfaction Guaranteed!

We stand behind everything we make 100%. If for any reason you are dissatisfied with a material you've received, we will do everything in our power to make it right. See our Guarantee Policy for more information.

Extensive Characterization Data

Each batch of gold nanoparticles is extensively characterized using techniques including transmission electron microscopy (TEM), dynamic light scattering (DLS), zeta potential, and UV-Visible spectroscopy. In addition to ensuring that every batch of nanoparticles meets our stringent quality control requirements, customers are provided with batch-specific specification sheets containing representative TEM images, sizing data, hydrodynamic diameter measurements, zeta potential analysis, UV-Visible spectrum, and solution pH.

Full Disclosure

Surface chemistry and suspension buffer details are provided for each material, and no proprietary coatings or mystery chemicals are used. Gold nanoparticle products are available with a range of capping agents including citrate, tannic acid, polyvinylpyrrolidone (PVP), polyvinyl alcohol (PVA), silica, and amine-terminated silica.

Aggregation Free

Due to their small size, low mass, and extremely high surface area:volume ratios, once nanoparticles bind together it is often impossible to separate them. Consequently, most dried gold nanopowders that are resuspended consist of clusters of 100's of individual nanoparticles. For many plasmonics and biomedical applications, this agglomeration significantly degrades performance. At nanoComposix we have developed custom processing techniques that allow us to concentrate and purify nanoparticles without inducing agglomeration. The particles can be transferred into a variety of different solvents to enable their integration into a wide variety of systems. In addition, we have developed a surface stabilization technique that allows us to produce dried gold nanoparticles that can be redispersed into individual, monodisperse nanoparticles.

Customer Service

Our nanoparticle chemists will address your technical questions and help you select the optimal nanomaterial for your application.