For silica nano-particles, typical sizes range from 15 to 50 nm, although people have been using them in the range of 15 to 35 nm.
As for price, it depends mostly on purity levels of the colloidal (or precipitated) solution as well as on solids content. Of course, the smaller the particle, the less the solids content (due to stroonger particle-particle repulsive forces). Ultra pure systems (like those offered by Fuso in Japan) can cost 4 to 10 times more than the less pure ones such as those offered by Clariant and others.
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For silica nano-particles,
For silica nano-particles, typical sizes range from 15 to 50 nm, although people have been using them in the range of 15 to 35 nm.
As for price, it depends mostly on purity levels of the colloidal (or precipitated) solution as well as on solids content. Of course, the smaller the particle, the less the solids content (due to stroonger particle-particle repulsive forces). Ultra pure systems (like those offered by Fuso in Japan) can cost 4 to 10 times more than the less pure ones such as those offered by Clariant and others.
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