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Related Concept Videos

Colloids03:22

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Color and texture morphing with colloids on multilayered surfaces.

Ziguang Chen1,2, Shumin Li1,2, Andrew Arkebauer3

  • 1†Department of Mechanical and Materials Engineering, University of Nebraska, Lincoln, Nebraska, 68588, United States.

ACS Applied Materials & Interfaces
|March 18, 2015
PubMed
Summary

Marine species can change color and texture to survive. This study demonstrates a synthetic material that mimics this ability using colloids in a multilayered structure, achieving rapid, reversible color morphing.

Keywords:
colloidal assemblymorphingphotothermal effectsurface tension

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Area of Science:

  • Materials Science
  • Biomimicry
  • Optics

Background:

  • Marine organisms exhibit dynamic color and texture changes for survival, self-defense, and reproduction.
  • Mimicking these adaptive capabilities in synthetic materials is a significant challenge in materials science.

Purpose of the Study:

  • To develop a synthetic multilayered structure capable of dynamic color and texture morphing.
  • To investigate the mechanisms and performance of light-induced colloid assembly for adaptive camouflage.

Main Methods:

  • Fabrication of a multilayered structure with a thermal insulating base, light-absorbing mid-layer, and liquid top layer containing colloids.
  • Utilizing moderate light intensity (approx. 0.2 W cm(-2)) to induce colloid assembly for optimal light absorption.
  • Testing reversible responses under continuous laser pulses to assess speed and durability.

Main Results:

  • The structure demonstrated dynamic color and texture morphing in response to light stimuli.
  • Over 18,000 reversible responses were recorded with a response initiation time of 20 ms and completion time of 160 ms.
  • The system's adaptability was shown by its successful implementation on various light-absorbing substrates and with a solid top layer.

Conclusions:

  • A novel synthetic material capable of dynamic morphing, inspired by marine species, has been successfully developed.
  • The light-induced colloid assembly mechanism provides a fast, reversible, and durable method for adaptive color and texture changes.
  • This technology holds potential for applications in adaptive camouflage, smart coatings, and responsive materials.