微小重力環境下におけるガラスの液-液分相のその場観察

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  • 南 祐二
    北陸先端科学技術大学院大学ナノマテリアルテクノロジーセンター
  • 牧島 亮男
    北陸先端科学技術大学院大学ナノマテリアルテクノロジーセンター
  • 丹治 章
    宇宙環境利用推進センター
  • 小西 智也
    物質・材料研究機構物質研究所
  • 井上 悟
    物質・材料研究機構物質研究所

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  • In Situ Observation of Liquid-Liquid Phase Separation of Glass under Microgravity

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We succeeded in the in situ observation of liquid-liquid phase separation of glass under microgravity at the Japan Microgravity Center (JAMIC), which provides a 10 s microgravity duration. The microgravity level is 10-5 g (g≡gravitational field at Earth's surface). We constructed an apparatus for the observation of phase separation suitable for the experimental facility. The melt of 3BaO•97B2O3 (mol%) was held as a film on a Pt wire loop. The sample was initially heated above the immiscibility temperature and held at that temperature. After the homogenization stage, the melt was cooled. Liquid-liquid phase separation of the melt was observed directly with a video camera. It was found that the nucleation and growth of phase-separated particle under microgravity are slower than in the case of 1-g, and the delay time of phase separation between the case of microgravity and 1-g depends on the flow rate of the melt under microgravity. These observations could be interpreted in terms of Marangoni convection and a change of diffusion.<br>

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