# Particle Arrangements and Optical Changes Induced by the Water Swelling of Melanin-Like Polydopamine Layers

https://mdr.nims.go.jp/datasets/7ff8bb83-7598-4ea4-9cfb-3dd8d554cb5f

## File

- [taku0404.docx](https://mdr.nims.go.jp/filesets/f4cc170a-4491-4701-9700-c3386602927b/download) ([Detail](https://mdr.nims.go.jp/filesets/f4cc170a-4491-4701-9700-c3386602927b.md))

## Id

7ff8bb83-7598-4ea4-9cfb-3dd8d554cb5f

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-09-17T03:55:55.181023Z

## Updated at

2026-02-14T11:51:38.070004Z

## Published at

2026-08-20T23:25:49.341733Z

## Doi

https://doi.org/10.48505/nims.5915

## First published url

https://doi.org/10.1021/acs.langmuir.5c01855

## Date published

2025-09-02

## Recorded date published

2025-9-2

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Particle Arrangements and Optical Changes Induced by the Water Swelling of
    Melanin-Like Polydopamine Layers
  title_type: original
  lang: en

## Description

- description: The assembled structures of melanin particles, i.e., colloidal particles
    coated with a melanin-like polydopamine (PDA) layer, create vivid structural colors.
    While the thickness of the PDA layer influences the particle arrangement and optical
    properties, the underlying mechanism has remained controversial. We demonstrate
    that the water-swelling characteristics of PDA are crucial factors governing the
    dispersion and aggregation of these particles in solution. Detailed comparisons
    between dry and wet conditions revealed that the PDA layer readily absorbs water
    molecules, which leads to significant swelling in the thicker layers. The swelling
    of the PDA layers determined whether the particles remained dispersed or partially
    aggregated in the water, ultimately controlling the particle arrangement in the
    dry state once the water evaporated. These findings provide insights into the
    self-assembly of colloidal particles and offer a strategy for tuning the periodic
    particle order. This feature is pivotal for various applications in optical and
    sensing technologies.
  description_type: abstract
  lang: und

## Creator

- name: Taku Watanabe
  role: author
- name: Yui Maejima
  role: author
- name: Yuki Ueda
  role: author
- name: Ryuhei Motokawa
  role: author
- name: Ai Takabatake
  role: author
- name: Shin-ichi Takeda
  role: author
- name: Hiroshi Fudouzi
  role: author
  orcid: https://orcid.org/0000-0003-1442-4667
  organization: National Institute for Materials Science
- name: Keiki Kishikawa
  role: author
- name: Michinari Kohri
  role: author

## Contact agent



## Publisher

organization: American Chemical Society (ACS)

## Managing organization



## Keyword

- subject: polydopamine
  schema: not_defined
- subject: structural colors
  schema: not_defined
- subject: colloidal crystal
  schema: not_defined
- subject: core shell
  schema: not_defined
- subject: amorphous
  schema: not_defined
- subject: Bragg diffraction
  schema: not_defined
- subject: iridescent
  schema: not_defined

## Rights

- description: 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.5c01855.
  identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo

start_date: 2025-08-21
end_date: 2026-08-21

## Journal

- title: Langmuir
  issn: '07437463'
  volume: '41'
  issue: '34'
  start_page: 22762
  end_page: 22773

## Conference



## Related item



## Funding

- identifier: JP24H01697
  funder_name: Japan Society for the Promotion of Science
- identifier: JP23H02018
  funder_name: Japan Society for the Promotion of Science
- identifier: 2024-042
  funder_name: National Institute for Materials Science
- identifier: 2025-011
  funder_name: National Institute for Materials Science
- identifier: J24HJ00045
  funder_name: Support for Pioneering Research Initiated by the Next Generation

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## Fileset

- id: f4cc170a-4491-4701-9700-c3386602927b
  filename: taku0404.docx
  content_type: application/vnd.openxmlformats-officedocument.wordprocessingml.document
  size: 7748628
  md5: 3b3fb157f27e1905316786ad783db0b3

## Thumbnail

fileset_id: f4cc170a-4491-4701-9700-c3386602927b
filename: taku0404.docx