Nanoparticles colloid

Gold Colloidal Nanoparticles Sized to be Suitable Precursors for Heterogeneous Catalysts... 

The main advantage of the salt reduction method in the liquid phase is that it is reproducible and allows colloidal nanoparticles with narrow size distribution to be prepared. 

Wu YD, Wang LS, Xiao MW, Huang XJ (2008) A novel sonochemical synthesis and nanostructured assembly of polyvinylpyrrolidone-capped CdS colloidal nanoparticles. J Non-Cryst Solid 354(26) 2993-3000... 

There are several bottom-up methods for the preparation of nanoparticles and also colloidal nanometals. Amongst these, the salt-reduction method is one of the most powerful in obtaining monodisperse colloidal particles. Electrochemical methods, which gained prominence recently after the days of Faraday, are not used to prepare colloidal nanoparticles on a large scale [26, 46], The decomposition of lower valent transitional metal complexes is gaining momentum in recent years for the production of uniform particle size nanoparticles in multigram amounts [47,48],... 

Figure 3.7 TEM micrographs indicating the size and uniform distribution of colloidal nanoparticles on Vulcan XC 72 using LiBet3H, N(oct)4Bet3H and aluminumorganic synthetic pathways.

What are the advantages of Bonnemann s method of colloidal nanoparticle synthesis ... 

Colloidal nanoparticles can be employed as heterogeneous catalyst precursors in the same fashion as molecular clusters. In many respects, colloidal nanoparticles offer opportunities to combine the best features of the traditional and cluster catalyst preparation routes to prepare uniform bimetallic catalysts with controlled particle properties. In general, colloidal metal ratios are reasonably variable and controllable. Further, the application of solution and surface characterization techniques may ultimately help correlate solution synthetic schemes to catalytic activity. 

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