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Surface-modified particles and microgels are recognized for adsorbing at the air/water interface. This particle assembly behavior has been evaluated primarily under conditions where all the particles are adsorbed using a dilute dispersion. In this study, we visualized the adsorption/stabilization process of particle assemblies at the air/water interface in a concentrated dispersion through structural coloration. Melanin particles coated with a gel layer were prepared, and these aqueous dispersions were dried. Pronounced coffee ring patterns with almost no particle deposition in the center of the pattern were obtained from pristine melanin particle dispersions. On the other hand, the use of polymer gel-coated particles suppressed the coffee ring effect and resulted in particle deposition not only around the pattern periphery but also in the center, indicating that the assembly behavior was affected by the gel layer. The observation of structural color during the drying process revealed adsorption at the air/water interface and differences in the size and motion of the domain. Furthermore, it was demonstrated that the use of this gel-coated particle is effective for structural color coating with uniform visibility.

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• In Copyright
  

  This document is the Accepted Manuscript version of a Published Work that appeared in final form in Langmuir, 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/acs.langmuir.5c03990.

Keyword: Particle assembly, Coffee-ring, Gel layer, Structural color, Melanin, Air/water interface

Date published: 2025-11-11

Publisher: American Chemical Society (ACS)

Journal:

• Langmuir (ISSN: 07437463) vol. 41 issue. 44 p. 29730-29740

Funding:

• Ministry of Education, Culture, Sports, Science and Technology 20251002
• Ministry of Education, Culture, Sports, Science and Technology 20255002
• Japan Agency for Medical Research and Development JP25ama121006
• Japan Society for the Promotion of Science JP23H02018
• Japan Society for the Promotion of Science JP24H01697
• National Institute for Materials Science 2024-042
• National Institute for Materials Science 2025-011
• Support for Pioneering Research Initiated by the Next Generation J24HJ00045

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6078

First published URL: https://doi.org/10.1021/acs.langmuir.5c03990

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Updated at: 2026-04-30 12:01:11 +0900

Published on MDR: 2026-10-31 08:36:40 +0900