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This chapter examines the structural dynamics of NPs smaller than the critical size for nucleation in a polymorphic system. A sample preparation method developed in this study utilized the large surface area of CNTs as an “unrestricted observation space,” allowing for the in-situ formation and growth of Al2O3 NPs under TEM observation. Nucleating NPs were found to fluctuate among different polymorphs and an amorphous state. Variable-temperature observations and quantitative analyses of these fluctuations revealed the energy landscape. Millisecond imaging further clarified the transformation mechanism, which proceeds through transient disordering.

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Non-deterministic Structural Fluctuation in Crystal Nucleation and Phase Transition

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  • 发表日期：

    2026年

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  • Masaya Sakakibara

摘要

This chapter examines the structural dynamics of NPs smaller than the critical size for nucleation in a polymorphic system. A sample preparation method developed in this study utilized the large surface area of CNTs as an “unrestricted observation space,” allowing for the in-situ formation and growth of Al2O3 NPs under TEM observation. Nucleating NPs were found to fluctuate among different polymorphs and an amorphous state. Variable-temperature observations and quantitative analyses of these fluctuations revealed the energy landscape. Millisecond imaging further clarified the transformation mechanism, which proceeds through transient disordering.