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Mechanism growth kinetics of nano YAG.pdf (1.37 MB)

Solvothermal nanoYAG synthesis: mechanism and particle growth kinetics

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journal contribution
posted on 2015-12-15, 13:39 authored by Prabhu Ramanujam, Vaidhy VaidhyanathanVaidhy Vaidhyanathan, J.G.P. Binner, Shaghayegh Ghanizadeh, Chris Spacie
NanoYAG particles with spherical morphology have been synthesised using a solvothermal method; a structure sensitive reaction, where the chemical reaction and the particle growth kinetics are interdependent. It has been observed that the primary YAG particles agglomerated into ∼30 nm clusters via a self-assembled Ostwald ripening process along (2 1 1) planes, separated by a distance of ∼0.49 nm, at 270 °C and 2.0 MPa for 2 h. These nanoclusters coalesced into single nanoparticles of ∼30 nm in size and exhibited a smaller inter planar distance of ∼0.26 nm, corresponding to the (4 2 0) planes, when synthesized at 300 °C and 8.5 MPa for 2 h. in addition, the solvent 1,4-butanediol transformed into 1,4-diacetoxybutane, this will have undergone esterification by reacting with the terminal acetate groups cleaved from the precursor, yttrium acetate. The proposed mechanism based on the analytical evidence suggests that a complete dissolution of precursors facilitated the structural re-arrangement of atoms within the planes and lead to a significantly higher degree of crystallinity. Moreover, once the particles with (4 2 0) planes had formed, they were no longer involved in facile coalescence along their preferential planes due to their lower interfacial energy compared to the (2 1 1) planes. This led to control of the particle morphology and with little agglomeration occurring in the final nanopowder.

Funding

The authors would like to thank Morgan Advanced Materials, Swansea, UK, and Loughborough University Studentship for financial support.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Materials

Published in

Journal of Supercritical Fluids

Volume

107

Pages

433 - 440

Citation

RAMANUJAM, P. ... et al, 2016. Solvothermal nanoYAG synthesis: mechanism and particle growth kinetics. Journal of Supercritical Fluids, 107, pp. 433 - 440.

Publisher

© Elsevier

Version

  • AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

2015-09-29

Publication date

2015-10-01

Copyright date

2016

Notes

This paper was accepted for publication in the journal Journal of Supercritical Fluids and the definitive published version is available at http://dx.doi.org/10.1016/j.supflu.2015.09.031

ISSN

0896-8446

Language

  • en

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