Assertion: titanium dioxide | /r/HasProperty | photocatalyst
Facets:
value: upon exposure to uv light
type: TEMPORAL
value: unlike ceramics
type: OTHER
Source sentences:
text: Titanium dioxide is a photocatalyst: it's a material that makes chemical reactions happen when the right kind of light shines on it.
text: Unlike ceramics that upconvert to kill germs, titanium dioxide is a photocatalyst—upon exposure to UV light, it generates free radicals, which are particularly deadly to microorganisms.