In bottom up approach how metals are aggregated to form nanoparticles, what are the forces responsible for their stabilization especially in solution?
Dear Prabhakar
I think we can work upon the surface charges as such so that the have intra particulate repulsion to avoid any kind of aggregation in terms of stability.
The other area is the surface energy which should be minimum in order to make them stable........
Dear Prabhakar
This abstract may be useful for you:
Fusion and Aggregation of Gold Nanoparticles: A Chemical Approach
Master thesis
Leonardo da Silva Bonifácio
University of São Paulo - USP
Institute of Chemistry - 2006
Abstract
Under the nanotechnological point of view, the dimensionality comes into play when one is dealing with many properties from the materials. Bulk gold with dimensions reduced to the nanometric scale shows singular reactivity and electronic properties. In the present work a further knowledge of the gold nanoparticles properties is sought from a chemical approach, through the investigation of surface interactions and their correlations with aggregation phenomena. Studies aiming a further understanding on the influence of different length ligands in the aggregation and fusional processes were performed with the ligands: pyrazine, 4,4'-bipyridine, 1,2-bis(4-pyridyl)ethane and 1,4-bis[(4- pyridyl)ethenyl]benzene. Furthermore, the investigation of nanoparticles surface interaction with the ligands 2 and 4-mercaptopyridine and their complexes with pentacianoferrate was also investigated allowing the obtainment of building block potentially useful for the generation of nanostructured materials through Prussian blue-like bonds. Finally, the obtainment of a new material based on surface interactions of gold nanoparticles on the inorganic support hydrotalcite was possible. The material exhibits peculiar thermochromic properties with colors dependent on the aggregation state of the nanoparticles.
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