Unconventional Alloys Confined in Nanoparticles: Building Blocks for New Matter
Unconventional Alloys Confined in Nanoparticles: Building Blocks for New Matter
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限制在纳米粒子中的非常规合金：新物质的构建模块
DOI：
10.1016/j.matt.2020.07.027
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发表时间：
2020-11-04
期刊：
影响因子：
18.9
通讯作者：
Choi, Mansoo
中科院分区：
文献类型：
--
作者：
Feng, Jicheng;Chen, Dong;Choi, Mansoo
由于动力学和热力学之间的无缝相互作用，制造非常规合金仍然具有挑战性。例如，高熵合金(HEA)使材料科学的范式转变成为可能，但这些转变受到传统的液-固转变的阻碍。相比之下，蒸气晶体转变提供了最有效的动力学途径来形成合金。在这里，充分混合的蒸汽被淬火，以产生55种不同的限制在纳米颗粒(NP)中的合金，其中包括前所未有的纳米颗粒。这种限制被发现可以稳定它们的合金化状态。与前体进料不同，微秒长的振荡火花将蒸汽混合并确定合金NPs的组成。为了概括实用性，我们将NPs作为高性能催化剂的整体构建块，并应用于纳米级添加剂制造，所得到的HEA纳米结构无法通过其他添加剂制造技术来制造。目前的工作打破了混相性的限制，从而为冶金、催化和添加剂制造领域的未知领域提供了一个强有力的路线图。
Manufacturing unconventional alloys remains challenging owing to the seamless interplay between kinetics and thermodynamics. High-entropy alloys (HEAs), for example, enable paradigm shifts in materials science but these shifts are hindered by traditional liquid-solid transformations. In contrast, vapor-crystal transformations offer the most kinetically efficient pathways to form alloys. Here, a well-mixed vapor is quenched to create 55 distinct alloys confined in nanoparticles (NPs), including unprecedented ones. This confinement is found to stabilize their alloyed states. Unlike precursor feeding, a microseconds-long oscillatory spark mixes the vapors and determines the composition of the alloy NPs. To epitomize practicalities, we apply the NPs as integral building blocks for high-performance catalysts and to nanoscale additive manufacturing The resulting HEA nanostructures cannot be fabricated by other additive manufacturing techniques. The present work breaks the miscibility limits, thereby providing a powerful roadmap to uncharted territories in metallurgy, catalysis, and additive manufacturing.