The nano heat effect of replacing macro-particles by nano-particles in drop calorimetry: The case of core/shell metal/oxide nano-particles

A. Yakymovych, G. Kaptay, H. Flandorfer, J. Bernardi, S. Schwarz, H. Ipser

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Experimental results are presented here obtained by a drop calorimetric method, in which Ni and Cu particles, both in bulk and nanosized form, were dropped into a liquid Sn-3.8Ag-0.7Cu solder alloy (in wt%). The molar enthalpies of mixing of the liquid (Sn-3.8Ag-0.7Cu)-Ni(Cu) alloys were measured. An extra exothermic heat effect is observed when dropping nano-particles instead of macro-particles. This is partly due to the loss of the large surface area and the corresponding large surface enthalpy of the nano-particles before their dissolution in the liquid alloy. However, a large additional exothermic heat effect was also found in the case of Cu-nano-particles, due to the exchange chemical reaction between the Cu2O shell of the nano-particles and liquid Sn; this is caused by the fact that the Cu-nano-particles are core-shell particles with an inner metallic Cu core and an outer Cu2O shell. This effect is less significant for Ni nano-particles which have a thinner oxide shell.

Original languageEnglish
Pages (from-to)8856-8869
Number of pages14
JournalRSC Advances
Volume8
Issue number16
DOIs
Publication statusPublished - Jan 1 2018

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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