Journal
NATURE COMMUNICATIONS
Volume 10, Issue -, Pages -Publisher
NATURE RESEARCH
DOI: 10.1038/s41467-019-09895-3
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Funding
- NSF of China [11790291, 61888102]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB30000000]
- MOST 973 Program [2015CB856800]
- Key Research Program of Frontier Sciences, CAS [QYZDY-SSW-JSC017]
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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.
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