Liquid-like behaviours of metallic glassy nanoparticles at room temperature

C. R. Cao, K. Q. Huang, J. A. Shi, D. N. Zheng, W. H. Wang, L. Gu and H. Y. Bai ()
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C. R. Cao: Chinese Academy of Sciences
K. Q. Huang: Chinese Academy of Sciences
J. A. Shi: Chinese Academy of Sciences
D. N. Zheng: Chinese Academy of Sciences
W. H. Wang: Chinese Academy of Sciences
L. Gu: Chinese Academy of Sciences
H. Y. Bai: Chinese Academy of Sciences

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Direct atomic-scale observations and measurements on dynamics of amorphous metallic nanoparticles (a-NPs) are challenging owing to the insufficient consciousness to their striking characterizations and the difficulties in technological approaches. In this study, we observe coalescence process of the a-NPs at atomic scale. We measure the viscosity of the a-NPs through the particles coalescence by in situ method. We find that the a-NPs have fast dynamics, and the viscosity of the a-NPs exhibits a power law relationship with size of the a-NPs. The a-NPs with sizes smaller than 3 nm are in a supercooled liquid state and exhibit liquid-like behaviours with a decreased viscosity by four orders of magnitude lower than that of bulk glasses. These results reveal the intrinsic flow characteristics of glasses in low demension, and pave a way to understand the liquid-like behaviours of low dimension glass, and are also of key interest to develop size-controlled nanodevices.

Date: 2019
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DOI: 10.1038/s41467-019-09895-3

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