In situ HREM study on sublimation-induced phase change in nanometer-sized gold and silver particles

Jung Goo Lee, Chunrin Chien, Chul Jin Choi, Hirotaro Mori

    研究成果: Conference contribution

    抄録

    The Phase stabilities of nanometer-sized materials are quite different from those of the corresponding bulk materials. Among the phase stabilities, melting point suppression is one of the most fundamentally important issues. Until now, the melting point suppression was studied with nanoparticles supported by solid substrates. However, the substrate effect on melting point of the nanoparticles has not been taken into consideration. In this work, real-time, atomic-scale direct observation of melting point suppression in nanometer-sized gold and silver particles on graphite substrate, along with simple size reduction, was conducted by in-situ high resolution electron microscopy. Namely, it was confirmed that a crystalline-to-liquid transition occurred when the size of gold particle, being placed on graphite substrate maintained at 1100 K, decreased down to 5 nm during diminution. However, no crystalline-to-liquid transition, only a crystalline-to-gas transition, took place in graphite-supported silver nanoparticles prior to the complete disappearance of the particles.

    本文言語English
    ホスト出版物のタイトルProceedings of the 20th (2010) International Offshore and Polar Engineering Conference, ISOPE-2010
    ページ530-533
    ページ数4
    出版ステータスPublished - 2010 9 10
    イベント20th International Offshore and Polar Engineering Conference, ISOPE-2010 - Beijing, China
    継続期間: 2010 6 202010 6 25

    出版物シリーズ

    名前Proceedings of the International Offshore and Polar Engineering Conference
    4
    ISSN(印刷版)1098-6189
    ISSN(電子版)1555-1792

    Other

    Other20th International Offshore and Polar Engineering Conference, ISOPE-2010
    国/地域China
    CityBeijing
    Period10/6/2010/6/25

    ASJC Scopus subject areas

    • エネルギー工学および電力技術
    • 海洋工学
    • 機械工学

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