Quantitative analysis and function development of molecular crystals with photo-triggered phase transition

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K23638
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0501:Physical chemistry, functional solid state chemistry, organic chemistry, polymers, organic materials, biomolecular chemistry, and related fields
• Research Institution: Waseda University
• Principal Investigator: Taniguchi Takuya 早稲田大学, データ科学センター, 准教授(任期付) (20843907)
• Project Period (FY): 2019-08-30 – 2022-03-31
• Keywords: 光トリガー相転移 / 力学特性 / 弾性率 / 発生力

Outline of Final Research Achievements

The photo-triggered phase transition is a phenomenon in which a structural phase transition of a crystal is induced by light, and differs from other light-responsive phenomena in that the structural change propagates to regions where light does not reach. We measured the elastic moduli of photoisomerized crystals that exhibit this light-triggered phase transition and found that there is a large anisotropy in the elastic moduli. We succeeded in performing a quantitative analysis of the deformation as well as a finite element method simulation analysis of the torsional deformation behavior of the crystal with photo-triggered phase transition. We also succeeded in measuring the force generated by light irradiation, and found that the photo-triggered phase transition leads to a unique time course of force generation behavior.

Free Research Field

材料科学

Academic Significance and Societal Importance of the Research Achievements

結晶材料に光を照射し、構造変化にともなう変形や発生する力を定量的に測定しました。変形解析では、本研究によってねじれ変形の詳細な発現機構が明らかになりました。力測定では、光トリガー相転移によって力の時間変化が特徴的な挙動を示しました。これらの定量解析の結果は、光応答現象と材料力学の学理において有用な知見になると考えられます。また、光を用いることの利点として遠隔操作できることや、局所照射できることなどが挙げられ、このような光応答性結晶材料により、光によって操作できるセンシングやスイッチング、メモリ、アクチュエータの開発につながる可能性があります。