How do very small particles behave at very high temperatures?
A Swansea University nanomaterials expert has been looking at how small gold particles survive when subjected to very high temperatures.
The research is important to the engineering sector for some potential applications of nanotechnology, for example in catalysis and aerospace, where particles of only nanometre dimensions are subjected to very high temperatures.
The results of the study, which was a 3-way collaboration between Birmingham, Swansea and Genoa University’s, was published this week in the journal Nature Communications. The study showed that gold nanoparticles of precisely selected size (561 atoms ±14) are remarkably robust against diffusion and aggregation but their internal atomic arrangements do change.
The researchers used an ultrastable, variable-temperature stage in an aberration-corrected scanning transmission electron microscope to subject an array of size-selected gold nanoparticles (or clusters) to temperatures as high as 500 °C while imaging them with atomic resolution. The particles were deposited from a nanoparticle source onto thin films of silicon nitride or carbon.
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