This thesis describes the development of in-situ cinematographic recording techniques for investigating phase dynamics using nanoparticles (NPs) as model systems. The suitable experimental platform realized the simultaneous high spatial and temporal resolution for in-situ observations of phase transitions. The impact of increased surface energy on phase stability in NPs drives phase dynamics under ambient conditions. By leveraging this, nano-specific polymorphs and the energy profile of structural fluctuation on NPs of inorganic compounds were identified at atomic resolution in real space. The surface energy-driven phase dynamics revealed here provide new guidelines for controlling nanomaterial structures and expanding the scope of future material exploration.
Chapter
1. Introduction.
Chapter
2. Transitions between Molecules and
Crystals: Molecular Dynamics in Crystal Growth and Sublimation on the
Surface.- Chapter
3. Structural Phase Transition Induced by the Size Change
of Nanocrystals.- Chapter
4. Non-Deterministic Structural Fluctuation in
Crystal Nucleation and Phase Transition.
Chapter
5. Summary and Outlook.
Masaya Sakakibara received his B.Sc., M.Sc., and Ph.D. in chemistry from the School of Science, The University of Tokyo in 2020, 2022, and 2025, respectively. He is now a postdoc researcher at Institute of Low Temperature Science, Hokkaido University. His research interest is exploration of nanoscopic mechanisms of phase dynamics.
