Efeito da anisotropia na dinâmica e morfologia de filmes finos instáveis

  • Data: 07/11/16 às 16:00 h
  • Local: Sl A5-01
  • Apresentador: Anna Chame, IF-UFF

Resumo: Muitos filmes finos são metaestáveis, e geralmente por influência da temperatura, podem se aglomerar ou ainda se romper, formando estruturas em três dimensões e deixando uma parte do substrato descoberto. Este processo, conhecido como 'dewetting', complica a fabricação de dispositivos baseados em filmes finos, mas por outro lado pode ser usado para a produção espontânea de um conjunto organizado de nanocristais sobre um substrato. O processo de 'wetting/dewetting' foi mais estudado no caso de líquidos. No caso de sólidos, o transporte de matéria se deve principalmente à difusão de superfície, e a anisotropia tem um papel importante. Estudamos o efeito da anisotropia através de simulações de Monte Carlo Cinético, usando um modelo simples do tipo sólido-sobre-sólido com difusão, onde o filme minimiza sua energia mudando de forma. Controlamos a anisotropia neste modelo considerando interações entre primeiros e segundos vizinhos.

Discussão

ssassa, 2022/03/13 03:26

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