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.
Low-Temperature Melting of Silver Nanoparticles in Subcooled and Saturated Water
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Lee, S, Phelan, PE, Taylor, RA, Prasher, R, & Dai, L. "Low-Temperature Melting of Silver Nanoparticles in Subcooled and Saturated Water." Proceedings of the ASME 2014 International Mechanical Engineering Congress and Exposition. Volume 8B: Heat Transfer and Thermal Engineering. Montreal, Quebec, Canada. November 14–20, 2014. V08BT10A041. ASME. https://doi.org/10.1115/IMECE2014-36963
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