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We present a simple template-free method for the synthesis of interconnected hierarchical porous palladiumnanostructures by controlling the aggregation of nanoparticles in organic media. The interaction between the nanoparticles is tuned by varying the dielectric constant of the medium consistent with DLVO calculations. The reaction products range from discrete nanoparticles to compact porous clusters with large specific surface areas. The nanoclusters exhibit hierarchical porosity and are found to exhibit excellent activity towards the reduction of 4-nitrophenol into 4-aminophenol and hydrogenoxidation. The method opens up possibilities for synthesizing porous clusters of other functional inorganics in organic media.
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