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Thermodynamic modeling and characterizations of Al nanoparticles produced by electrical wire explosion process

Published online by Cambridge University Press:  20 January 2017

L. Santhosh Kumar ,
S.R. Chakravarthi ,
R. Sarathi  and
R. Jayaganthan
L. Santhosh Kumar
Affiliation:
Department of Aerospace Engineering, IIT Madras, Chennai-600036, India
S.R. Chakravarthi
Affiliation:
Department of Aerospace Engineering, IIT Madras, Chennai-600036, India
R. Sarathi
Affiliation:
Department of Engineering Design, IIT Madras, Chennai-600036, India
R. Jayaganthan*
Affiliation:
Department of Electrical Engineering, IIT Madras, Chennai-600036, India
*
a) Address all correspondence to this author. e-mail: metarj@iitm.ac.in
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Abstract

Aluminum (Al) nanoparticles are synthesized by wire explosion process (WEP) in an inert ambience of argon. Thermodynamic analysis and structural characterization of nano Al particles are made in the present work. Transmission electron microscopy (TEM) characterization has shown that the Al nanoparticles produced are spherical in shape and it follows a lognormal distribution. A unimodal size dependent thermodynamic model is formulated to understand the size dependent thermal behavior of aluminum nanoparticles. Three different melting modes such as, homogeneous melting mode (HMM), liquid skin melting (LSM) and liquid nucleation and growth (LNG) are assumed to understand the melting behavior of aluminum nanoparticles synthesized by the WEP process. The effect of saturation ratio on the nucleation rate and the impingement factor is also discussed. The size dependent melting and enthalpy of fusion of Al nanoparticles predicted by thermodynamic model are in tandem with the DSC results.

Keywords

wire explosionnanoparticlesthermodynamicsmicroscopy

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Type
Articles
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Journal of Materials Research , Volume 32 , Issue 4 , 28 February 2017 , pp. 897 - 909
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Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Susan B. Sinnott

References

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