| http://www.w3.org/ns/prov#value | - In especially preferred embodiments, the boron nitride, silicon nitride or titanium nitride interstitial coating is from 0.4 angstroms to 5 nanometers, especially from 1.5 angstroms to 1 nanometer, thick and the silica or alumina coating is from 1.5 to 10 nanometers thick.The particle may contain additional coatings, but these are usually unnecessary and provide little benefit and are preferably o
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