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Niobate nanosheets prepared by exfoliation of layered hexaniobate K 4 Nb 6 O 17 were sequentially decorated with two noble metal nanoparticles, gold and silver, through two-step photochemical reactions. First, cationic bis(ethylenediamine)gold(III) ions were electrostatically adsorbed on the anionic niobate nanosheets, and reduced to gold nanoparticles by UV excitation of the...
Hydration enthalpies of synthetic A-type and some natural zeolites have been measured by an adiabatic gas-absorption calorimeter to evaluate zeolite as a heat exchange absorbent for a solar-powered system. The Mg-exchanged A-zeolite is a suitable absorbent, if it is dehydrated at 100°C. The total hydration heat is the highest (531 kJ kg -1 ) of the A-type zeolites treated in the present...
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