Unique surface patterns emerging during solidification of liquid metal alloys

被引：0
作者：
Jianbo Tang
Stephanie Lambie
Nastaran Meftahi
Andrew J. Christofferson
Jiong Yang
Mohammad B. Ghasemian
Jialuo Han
Francois-Marie Allioux
Md. Arifur Rahim
Mohannad Mayyas
Torben Daeneke
Chris F. McConville
Krista G. Steenbergen
Richard B. Kaner
Salvy P. Russo
Nicola Gaston
Kourosh Kalantar-Zadeh
机构：
[1] University of New South Wales (UNSW),School of Chemical Engineering
[2] Department of Physics,MacDiarmid Institute for Advanced Materials and Nanotechnology
[3] The University of Auckland,ARC Centre of Excellence in Exciton Science, School of Science
[4] RMIT University,School of Science, College of Science, Engineering and Health
[5] RMIT University,School of Engineering
[6] RMIT University,Institute for Frontier Materials
[7] Deakin University (Warren Ponds Campus),MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Chemical and Physical Sciences
[8] Victoria University of Wellington,Department of Materials Science and Engineering
[9] University of California,Department of Chemistry and Biochemistry
[10] Los Angeles (UCLA),undefined
[11] University of California,undefined
[12] Los Angeles (UCLA),undefined
来源：
Nature Nanotechnology | 2021年 / 16卷
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摘要：
It is well-understood that during the liquid-to-solid phase transition of alloys, elements segregate in the bulk phase with the formation of microstructures. In contrast, we show here that in a Bi–Ga alloy system, highly ordered nanopatterns emerge preferentially at the alloy surfaces during solidification. We observed a variety of transition, hybrid and crystal-defect-like patterns, in addition to lamellar and rod-like structures. Combining experiments and molecular dynamics simulations, we investigated the influence of the superficial Bi and Ga2O3 layers during surface solidification and elucidated the pattern-formation mechanisms, which involve surface-catalysed heterogeneous nucleation. We further demonstrated the dynamic nature and robustness of the phenomenon under different solidification conditions and for various alloy systems. The surface patterns we observed enable high-spatial-resolution nanoscale-infrared and surface-enhanced Raman mapping, which reveal promising potential for surface- and nanoscale-based applications.
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页码：431 / 439
页数：8
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