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説明:

Stimuli-responsive, directional motions, such as chemotaxis, are vital for the development of sophisticated synthetic systems with autonomous motility. Here, we demonstrate that disks containing hinokitiol exhibit directional self-propelled motion on water in response to metal ions, particularly Fe(III) ion. The self-propelled motion arises from surface tension gradients at the air–water interface, generated by the asymmetric release of hinokitiol, which induce Marangoni flows that propel the disks. Upon contact with Fe(III), hinokitiol forms a highly surface-active complex that locally lowers the surface tension and establishes a persistent interfacial gradient. This localized accumulation of the iron complex acts as a chemo-repulsive signal, directing the disks away from iron-rich regions and leading to the formation of exclusionary zones that influence the trajectories of subsequent disks. These findings demonstrate how self-secreted chemical signals can generate interfacial memory and communication in macroscopic active systems, providing a molecular design principle for life-like collective behavior.

権利情報:

• https://creativecommons.org/licenses/by-nc/3.0/
  

キーワード: Hinokitiol, Chemotaxis, Self-propelled motion

刊行年月日: 2026-03-06

出版者: Royal Society of Chemistry (RSC)

掲載誌:

• RSC Advances (ISSN: 20462069) vol. 16 issue. 14 p. 12725-12729

研究助成金:

• Ministry of Education, Culture, Sports, Science and Technology JPMXP0724020292
• Ministry of Education, Culture, Sports, Science and Technology JPMXP1224NM5109
• Ministry of Education, Culture, Sports, Science and Technology JPMXP1225NM5064
• Japan Society for the Promotion of Science JP21H01004
• Japan Society for the Promotion of Science JP23K03347
• Japan Society for the Promotion of Science JP23K04725
• Japan Society for the Promotion of Science JP24H01734
• Japan Society for the Promotion of Science JP24K01475
• Inamori Foundation

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1039/D6RA01403H

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更新時刻: 2026-03-09 08:55:27 +0900

MDRでの公開時刻: 2026-03-10 09:03:20 +0900