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Position:Home > News > Technical Data > were studied. Esumi et al. reported the preparation
were studied. Esumi et al. reported the preparation
Source:    Published:2011/6/9 16:05:44

   were studied. Esumi et al. reported the preparation of stable Pd colloids with average particle sizes of 8-lOnm from the thermal decomposition of Pd complexes in methyl isobutyl ketone [6,7]. Organosols of Ti, Zr, V, Nb and Mn with small particle size, stabilized by intact THF molecules, were prepared in Bonnemann's group by reducing the corresponding metal halides in

   THF using K[BEt3H] as a reductant [8]. Curtis et al. prepared a Cu colloid with a mean r~2tal particle size of 13.3 nm in methanol by reducing Cu2+ salts with hydrazine hydrate [9]. Stable colloidal solutions of cubic Pt nanoparticles stabilized by oxalate with an average particle size of 6.5 nm and a shape selectivity larger than 90% were successfully prepared via the reduction of

   K2Pt(C204)2 in water with hydrogen at room temperature. After exposure to air and treatment with hydrogen, the oxalate-stabilized Pt nanoparticles could self-assemble

  

   into Pt nanowires with almost the same diameters as the original Pt particles and lengths of several hundreds of nanometers The achievements described above made remarkable contributions to the preparation of unprotected metal nanoclusters. However, limiting the discussion to developing metal nanocluster-based catalytic systems, there are still great challenges in relation to the unprotected metal nanoclusters as pointed out behind: (1) effectively preparing unprotected metal and alloy nanoclusters with controllable particle size, shape and composition, which can be used as tractable building blocks for assembling various catalysts, in which the circumjacent environment of the metal nanoclusters can be modulated easily; (2) in

   virtue of the unique properties of unprotected metal

  

   nanoclusters, investigating the structure-property relationships of metal nanocluster-based catalysts, including the metal particle size effect, alloying effect, ligand effect and the support effect, as well as distinguishing these effects; (3) developing practical nanocomposite catalysts with excellent properties by immobilizing the unprotected metal nanoclusters on nanostructured supports, controlling the size and distribution of metal nanoparticles at demanding metal loading. Metal Nanoclusters in Catalysis and Materials Science: The Issue of Size Control ◎ 2008 Elsevier B.V. All rights reserved Edited by B. Corain, G. Schmid and N. Toshima

  

CAS NO.7362-93-8
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