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Nanomaterials

Oxide Nanoparticles

Alumina, titania, zinc oxide, silica and other oxide nanopowders in defined crystal phases and particle sizes for catalysis, coatings and ceramics.
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Oxide nanoparticles are used as catalyst supports, UV blockers, abrasives, sensor layers and ceramic precursors. This sub-category supplies them with stated crystal phase, particle size and purity. Aluminium oxide is listed in several forms, including α-phase nanopowder at APS 80 nm, 150 nm and 200 nm, γ-phase nanopowder at 10 nm, 20-30 nm, 20-50 nm and 40-80 nm, and a mixed α/γ grade at 27-43 nm.

Phase decides behaviour. γ-alumina has high surface area and acidity, which suits catalyst supports and adsorbents, while α-alumina is dense, hard and stable, which suits ceramics and polishing. Similar phase choices apply to titania (anatase or rutile) and zirconia. Surface area by BET and particle size by TEM are the figures to compare between suppliers.

Powders ship in sealed, double-bagged containers to limit dust. Each lot comes with a COA and SDS. Ready-made dispersions of many oxides are listed in the next sub-category for users who prefer a liquid form. Ask about larger quantities for coating and ceramic trials.

Oxide Nanoparticles: questions buyers ask

When should I choose gamma rather than alpha alumina?
Choose γ-alumina when you need high surface area and active surface sites, as in catalyst supports, adsorbents and some chromatography uses. Choose α-alumina for hardness, chemical stability and high-temperature strength, as in ceramics, polishing and wear coatings. γ-alumina converts to the α form above about 1,100 °C.
How are oxide nanoparticle surface areas measured?
Specific surface area is measured by nitrogen adsorption and BET analysis, reported in m²/g. Smaller particles give larger surface areas. Comparing BET values helps confirm that a powder is as fine as stated, since agglomeration and sintering reduce accessible surface area.
Can oxide nanopowders be used in cosmetics?
Some oxides, such as zinc oxide and titanium dioxide, are used as UV filters in cosmetics, but regulations govern nano forms, purity and coatings. Research grades here are not cosmetic ingredients. If you need a cosmetic-compliant nano oxide, ask us about suitable grades and documentation.

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