Materials Development Division

Biomaterials Science



  • Assoc. Prof. Norihiko OKAMOTO
  • Assist. Prof. Hiroshi TANIMURA

Development of Novel Materials Exhibiting Specific Functions Through Structural Control in Various Phase Transitions

Based on the scientific fields such as materials microstructure theory, thermal statistical thermodynamics, micromechanics theory, electrochemistry, we aim to research and develop novel materials exhibiting new functions (mechanical properties, electrical or optical properties, etc) by controlling the material microstructures through various phase transformations.

The current laboratory name is related to "biomaterial research", but in future it will be changed to a laboratory name concerning structure-controlled functional materials. Based on microstructure theory, thermal statistical thermodynamics, micromechanics theory, electrochemistry, we aim at "novel material development that exhibits new functions by controlling the microstructure structure through various phase transformations", by means of such as X-ray, electron beam, femtosecond laser and ultrasonic resonance method etc. Specifically, we focus on: microstructure formation dynamics of solid-solid phase transition and its control by application of external fi elds, elucidation of relaxation mechanism and structural inhomogeneity in metallic glasses using megahertz oscillation, construction of "electrode microstructure theory" in storage battery system, elucidation of ultrafast amorphization mechanism of photoinduced phase change material, and material design utilizing phase transition such as nickel-base superalloy and titanium alloy, etc. In the end, we will aim to research and develop new materials that express new functionalities across the various fi elds.

phase transition dynamics, electrode microstructure study, amorphous material, micromechanics
The partially crystallized structureunder ultrasonic oscillation resonating withβ relaxation of a Pd-based metallic glass

(Left) The partially crystallized structure under ultrasonic oscillation resonating with β relaxation of a Pd-based metallic glass, structural inhomogeneity and phonon dispersion schematics. (Right) Spinel-to-rocksalt phase transition that occurs when Mg ions are inserted into MgCo2O4 as a positive electrode material for magnesium rechargeable battery.

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