| http://www.w3.org/ns/prov#value | - as metal oxide which is particularly suitable for the present invention, of the inorganic oxides which are preferably selected from silicon, zirconium or cerium oxides and their mixtures.They are more preferably a silica, an alumina, an aluminosilicate or one of their mixtures.The size of the particles of the claimed encapsulation system can be of the order of a few tens of microns.
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