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Low-Temperature Melting of Silver Nanoparticles in Subcooled and Saturated Water

[+] Author Affiliations
Soochan Lee, Patrick E. Phelan, Ravi Prasher, Lenore Dai

Arizona State University, Tempe, AZ

Robert A. Taylor

University of New South Wales, Sydney, Australia

Paper No. IMECE2014-36963, pp. V08BT10A041; 9 pages
doi:10.1115/IMECE2014-36963
From:
  • ASME 2014 International Mechanical Engineering Congress and Exposition
  • Volume 8B: Heat Transfer and Thermal Engineering
  • Montreal, Quebec, Canada, November 14–20, 2014
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4956-9
  • Copyright © 2014 by ASME

abstract

Continuous, laser-heated boiling experiments with silver nanofluids were conducted to identify the non-equilibrium melting behavior of silver nanoparticles in de-ionized (DI) water. Experimental results with Transmission Electron Microscopy (TEM) and Dynamic Light Scattering (DLS) suggest that surface melting of silver nanoparticles (which have a bulk melting point of 961°C) can occur at ambient pressure when particles are suspended in saturated, and even subcooled (e.g. < 100 °C) water due to the localized (volumetric) heat absorption. These findings are supported by calculating a temperature-dependent Hamaker constant of silver nanofluid — i.e. the interaction between interfaces (Ag-melt-water) at the melting temperature.

Copyright © 2014 by ASME

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