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Digestive ripening: a synthetic method par excellence for core-shell, alloy, and composite nanostructured materials

Bhaskar, Srilakshmi P and Jagirdar, Balaji R (2012) Digestive ripening: a synthetic method par excellence for core-shell, alloy, and composite nanostructured materials. In: JOURNAL OF CHEMICAL SCIENCES, 124 (6, SI). pp. 1175-1180.

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Official URL: http://dx.doi.org/10.1007/s12039-012-0317-2


The solvated metal atom dispersion (SMAD) method has been used for the synthesis of colloids of metal nanoparticles. It is a top-down approach involving condensation of metal atoms in low temperature solvent matrices in a SMAD reactor maintained at 77 K. Warming of the matrix results in a slurry of metal atoms that interact with one another to form particles that grow in size. The organic solvent solvates the particles and acts as a weak capping agent to halt/slow down the growth process to a certain extent. This as-prepared colloid consists of metal nanoparticles that are quite polydisperse. In a process termed as digestive ripening, addition of a capping agent to the as-prepared colloid which is polydisperse renders it highly monodisperse either under ambient or thermal conditions. In this, as yet not well-understood process, smaller particles grow and the larger ones diminish in size until the system attains uniformity in size and a dynamic equilibrium is established. Using the SMAD method in combination with digestive ripening process, highly monodisperse metal, core-shell, alloy, and composite nanoparticles have been synthesized. This article is a review of our contributions together with some literature reports on this methodology to realize various nanostructured materials.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to INDIAN ACAD SCIENCES, BANGALORE, INDIA
Keywords: Nanoparticles;core shell;alloy
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 19 Feb 2013 05:12
Last Modified: 19 Feb 2013 05:12
URI: http://eprints.iisc.ac.in/id/eprint/45832

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