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Thermal Stability of Spherical Nanoporous Aggregates and Formation of Hollow Structures by Sintering-A Phase-Field Study

Mukherjee, Rajdip and Chakrabarti, Tamoghna and Anumol, EA and Abinandanan, TA and Ravishankar, Narayanan (2011) Thermal Stability of Spherical Nanoporous Aggregates and Formation of Hollow Structures by Sintering-A Phase-Field Study. In: ACS Nano, 5 (4). pp. 2700-2706.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/nn103036q

Abstract

Nanoporous structures are widely used for many applications and hence it Is important to investigate their thermal stability. We study the stability of spherical nanoporous aggregates using phase-field simulations that explore systematically the effect of grain boundary diffusion, surface diffusion, and grain boundary mobility on the pathways for microstructural evolution. Our simulations for different combinations of surface and GB diffusivity and GB mobility show four distinct microstructural pathways en route to 100% density: multiple dosed pores, hollow shells, hollow shells with a core, and multiple interconnected pores. The microstructures from our simulations are consistent with experimental observations in several different systems. Our results have important implications for rational synthesis of hollow nanostructures or aggregates with open pores, and for controlling the stability of nanoporous aggregates that are widely used for many applications.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Chemical Society.
Keywords: nanoporous;hollow structures;phase field simulation;surface diffusion;grain boundary diffusion;grain boundary mobility
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Depositing User: Id for Latest eprints
Date Deposited: 20 May 2011 07:16
Last Modified: 22 Feb 2012 08:54
URI: http://eprints.iisc.ac.in/id/eprint/37693

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