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説明:

Materials that exhibit actuation behaviour in response to external stimuli have a wide range of applications due to their ability to convert input energy into mechanical work. Common sources of input energy include light and chemical energy, frequently used in actuation processes. However, the actuation using thermal energy from ambient temperature sources remains challenging for both polymer composites and molecule-based crystalline materials. In this study, we introduce a novel elastic crystal composed of dodecylated porphyrin molecules, exhibiting high flexibility and gradual deformation in response to temperature changes. When the crystal with a small weight load was positioned between a high-temperature and low-temperature heat source, the crystal exhibited continuous, large, and rapid oscillating motions. These oscillations persisted for at least 160 hours, corresponding to 3.9 million cycles of deformation, as long as the temperature difference was maintained. This study presents the first example of a molecular crystal functioning as an engine that can extract the kinetic energy from static and ambient temperature sources.

権利情報:

• In Copyright
  

  This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of the American Chemical Society, copyright © 2025 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/jacs.5c03529.

キーワード: crystal structure, actuation, porphyrin, nanoindentation, stimuli responsive, elastic crystal

刊行年月日: 2025-06-18

出版者: American Chemical Society (ACS)

掲載誌:

• Journal of the American Chemical Society (ISSN: 00027863) vol. 147 issue. 24 p. 20582-20589

研究助成金:

• Mazda Foundation
• Japan Society for the Promotion of Science JP20K15293
• Japan Society for the Promotion of Science JP21K14645
• Japan Society for the Promotion of Science JP22K14661
• Japan Society for the Promotion of Science JP23K04875
• SPring-8 2024A1219
• SPring-8 2024B1168

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5892

公開URL: https://doi.org/10.1021/jacs.5c03529

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更新時刻: 2026-04-30 12:01:11 +0900

MDRでの公開時刻: 2026-05-27 08:33:27 +0900