Eutectic crystallized FePd nanoparticles for liquid metal magnet.,Chemical Communications

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Eutectic crystallized FePd nanoparticles for liquid metal magnet.
Chemical Communications ( IF 4.3 ) Pub Date : 2020-04-30 , DOI: 10.1039/d0cc02618b
Zefan Shao ₁ , Lu An ₁ , Zheng Li ₁ , Yulong Huang ₁ , Yong Hu ₁ , Shenqiang Ren ₁

Affiliation

Magnetically hard nanoparticles have been widely explored in colloidal solution synthesis, while a high temperature-induced phase transformation is indispensable to achieve its high magnetocrystalline anisotropy. However, a long-standing challenge of magnetic nanoparticles is the inaccessibility of size-controlled growth without sintering-induced agglomeration. Here, we report a universal one-pot eutectic reaction scheme of magnetically hard FePd nanoparticles, in which the crystallization conditions are critical for its magnetic performance. We demonstrate that the stoichiometry between transition metal and eutectic salt and sintering temperature can play an important role in the magnetic coercivity of FePd nanoparticles. In addition, gallium liquid metal is employed as the conductivity filler for the formation of a magnetorheological fluid after mixing with metallic FePd nanoparticles. The liquid composite shows a high metallic and thermal conductivity as an unconventional cooling metallic ferrofluid conductor, and we further demonstrate its potential application in sensors, conductors and thermal interfaces.

中文翻译：

用于液态金属磁体的共晶结晶FePd纳米粒子。

在胶体溶液合成中已广泛探索了磁性硬纳米粒子，而高温诱导的相变对于实现其高磁晶各向异性是必不可少的。然而，磁性纳米颗粒的长期挑战是在没有烧结诱导的团聚的情况下无法获得尺寸控制的生长。在这里，我们报告了一种磁性硬FePd纳米粒子的通用一锅共晶反应方案，其中结晶条件对其磁性至关重要。我们证明过渡金属与低共熔盐之间的化学计量关系以及烧结温度可以在FePd纳米粒子的磁性矫顽力中发挥重要作用。此外，镓液态金属在与金属FePd纳米粒子混合后，用作形成磁流变流体的导电填料。液体复合材料作为非常规的冷却金属铁磁流体导体具有很高的金属和导热性，我们进一步证明了其在传感器，导体和热界面中的潜在应用。

更新日期：2020-04-30

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