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首页> 外文期刊>RSC Advances >The nano heat effect of replacing macro-particles by nano-particles in drop calorimetry: the case of core/shell metal/oxide nano-particles
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The nano heat effect of replacing macro-particles by nano-particles in drop calorimetry: the case of core/shell metal/oxide nano-particles

机译：纳米颗粒在液滴量热法中用纳米颗粒替代宏观颗粒的纳米热效应：芯/壳金属/氧化物纳米粒子的情况

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摘要

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.
机译：这里通过液滴量热法呈现实验结果，其中将块状和纳米型形式的Ni和Cu颗粒滴入液体Sn-3.8Ag-0.7Cu焊料合金（以Wt％）滴入。 测量液体（Sn-3.8Ag-0.7Cu）-NI（Cu）合金的混合的摩尔焓。 当落下纳米颗粒而不是宏观颗粒时，观察到额外的放热热效果。 这部分是由于在液体合金中溶解前的大表面积和纳米颗粒的相应大表面焓的损失。 然而，在Cu-纳米颗粒的情况下也发现了大的额外放热热效果，因为纳米颗粒和液体Sn的Cu 2 O壳之间的交换化学反应; 这是由Cu-纳米颗粒是具有内金属Cu核和外Cu2O壳的核 - 壳颗粒引起的。 对于具有较薄的氧化物壳的Ni纳米颗粒，这种效果不太重要。

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  • 来源
    《RSC Advances》 |2018年第16期|共14页
  • 作者

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

  • 作者单位

    Univ Vienna Fac Chem Dept Inorgan Chem Funct Mat Althanstr 14 A-1090 Vienna Austria;

    Univ Miskolc Dept Nanotechnol H-3515 Miskolc Egyet Varos Hungary;

    Univ Vienna Fac Chem Dept Inorgan Chem Funct Mat Althanstr 14 A-1090 Vienna Austria;

    Vienna Univ Technol Univ Serv Ctr Transmiss Electron Microscopy Wiedner Hauptstr 8-10 A-1040 Vienna Austria;

    Vienna Univ Technol Univ Serv Ctr Transmiss Electron Microscopy Wiedner Hauptstr 8-10 A-1040 Vienna Austria;

    Univ Vienna Fac Chem Dept Inorgan Chem Funct Mat Althanstr 14 A-1090 Vienna Austria;

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  • 正文语种 eng
  • 中图分类 化学;
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