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Recrystallization of deformed metal nanoparticles
Acta Materialia ( IF 8.3 ) Pub Date : 2024-09-05 , DOI: 10.1016/j.actamat.2024.120367 Jonathan Zimmerman , Eugen Rabkin
Acta Materialia ( IF 8.3 ) Pub Date : 2024-09-05 , DOI: 10.1016/j.actamat.2024.120367 Jonathan Zimmerman , Eugen Rabkin
Despite great advances in the fabrication methods of metal nanoparticles with various sizes and shapes, the available tools for manipulating their microstructure and morphology still remain limited. In the present work we introduce the age-old metallurgical technique of recrystallization to the synthesis of metallic nanoparticles. We uniaxially compressed a large number of single crystalline and defect free Pt nanoparticles obtained by solid-state dewetting and annealed them at the temperature of 1000 °C. Our findings reveal that, while the as-dewetted particles exhibited similar shapes and crystallographic orientations, the plastic deformation and annealing led to a diverse range of shapes, microstructures, and orientations among the particles. We categorized the particles into four distinct types based on their appearance: slanted, terraced, “Danish pastry”, and broken particles. Finally, we propose a differentiation mechanism responsible for this diversification, which relies on a combination of recrystallization, surface step formation, and solid-state dewetting processes.
中文翻译:
变形金属纳米颗粒的再结晶
尽管各种尺寸和形状的金属纳米颗粒的制造方法取得了巨大进步,但可用于操纵其微观结构和形态的工具仍然有限。在这项工作中,我们将古老的再结晶冶金技术引入金属纳米颗粒的合成中。我们将通过固态除湿获得的大量单晶无缺陷的 Pt 纳米颗粒单轴压缩,并在 1000 °C 的温度下退火。 我们的研究结果表明,虽然脱湿颗粒表现出相似的形状和晶体取向,但塑性变形和退火导致颗粒之间的形状、微观结构和取向各不相同。我们根据颗粒的外观将颗粒分为四种不同的类型:倾斜、梯田、“丹麦糕点”和破碎颗粒。最后,我们提出了一种导致这种多样化的差异化机制,它依赖于再结晶、表面台阶形成和固态去湿过程的组合。
更新日期:2024-09-05
中文翻译:
变形金属纳米颗粒的再结晶
尽管各种尺寸和形状的金属纳米颗粒的制造方法取得了巨大进步,但可用于操纵其微观结构和形态的工具仍然有限。在这项工作中,我们将古老的再结晶冶金技术引入金属纳米颗粒的合成中。我们将通过固态除湿获得的大量单晶无缺陷的 Pt 纳米颗粒单轴压缩,并在 1000 °C 的温度下退火。 我们的研究结果表明,虽然脱湿颗粒表现出相似的形状和晶体取向,但塑性变形和退火导致颗粒之间的形状、微观结构和取向各不相同。我们根据颗粒的外观将颗粒分为四种不同的类型:倾斜、梯田、“丹麦糕点”和破碎颗粒。最后,我们提出了一种导致这种多样化的差异化机制,它依赖于再结晶、表面台阶形成和固态去湿过程的组合。