Sub-nanometer noble-metal particles regularly located along the pore walls of freshly prepared silica monoliths have been synthesized. A very effective method of size restriction, presumably via a template mechanism of the entries of the micropore system, is shown to exist. Ordered mesoporous oxide can thus be a perfect host for inclusion of metal particles in 3D structures. The formation and stabilization of such tiny particles in highly porous material opens exciting prospects for catalytic applications.
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Bronstein et al. (2001) studied this question.