|Título||In-situ transmission electron microscopy growth of nanoparticles under extreme conditions
Luce, Flavia Piegas
Oliviero, Erwan Marie Hubert
Azevedo, Gustavo de Medeiros
Baptista, Daniel Lorscheitter
Fichtner, Paulo Fernando Papaleo
|Abstract||The formation and time resolved behavior of individual Pb nanoparticles embedded in silica have been studied by in-situ transmission electron microscopy observations at high temperatures (400–1100 C) and under 200 keV electron irradiation. It is shown that under such extreme conditions, nanoparticles can migrate at long distances presenting a Brownian-like behavior and eventually coalesce. The particle migration phenomenon is discussed considering the influence of the thermal energy and the electron irradiation effects on the atomic diffusion process which is shown to control particle migration. These results and comparison with ex-situ experiments tackle the stability and the microstructure evolution of nanoparticles systems under extreme conditions. It elucidates on the effects of energetic particle irradiation-annealing treatments either as a tool or as a detrimental issue that could hamper their long-term applications in radiation-harsh environments such as in space or nuclear sectors.
|Contido em||Journal of applied physics. New York. Vol. 119, no. 3 (Jan. 2016), 035901, 6 p.
Efeito da radiacao
Microscopia eletronica de transmissao
|Tipo||Artigo de periódico
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