Alphagalileo > Item Display

Recreating the Chameleon: Material Mimics Color Changes Of Living Organisms

27/06/2018 Nagoya University

Researchers at Nagoya University develop a composite material that, by adjusting its composition and exposing it to different types of light, can mimic animals’ changes in color

A range of creatures, including chameleons, octopuses, and frogs, can change color in response to changes in the environment. Some insights into the mechanisms behind this at the anatomical, cellular, and molecular levels have been obtained. However, much work is still required to obtain sufficient understanding of this phenomenon and to translate it into useful artificial applications.

As reported in the journal Small, researchers at Nagoya University’s Department of Molecular Design and Engineering developed a material containing dyes and crystals that can change the colors and patterns it displays depending on the background color used within it and its exposure to visible or ultraviolet light.

The team was inspired to develop this material by findings obtained in the skin of certain frogs, in which different layers of cells with different properties combine to enable remarkable color changes.

Each component of this novel material plays a key role in its color properties. For example, the dyes contribute their inherent colors to the material’s appearance, which can be adjusted by mixing them to different extents. These dyes also include those that change color upon exposure to light.

Spherical crystals were also introduced into the system, which rather than influencing the color through their inherent pigmentation affect it through their microscopic structures that can directly interfere with light. Finally, a black pigment and different background colors were employed to alter the colors the other components of the system display.

“We examined the influences of the different components in the system, such as by changing the size of the crystals, switching the background from white to black, or performing exposure to visible or ultraviolet light,” corresponding author Yukikazu Takeoka says. “We found these changes resulted in different colors being displayed across the material, resembling the way in which some organisms can change color in response to various factors in their environment.”

“This is an exciting stage in this field of study, as we are increasingly able to adapt the color-changing mechanisms that some animals use to artificial devices,” study first author Miki Sakai adds. “If these artificial color-changing materials can equal or surpass the vibrant displays that some animals such as octopuses and frogs make, it could have exciting applications in the development of new display technologies.”

The article “Bioinspired Color Materials Combining Structural, Dye, and Background Colors” was published in Small at DOI: 10.1002/smll.201800817.
Attached files
  • Color change of pigment obtained by fusing spherical colloidal crystal and diaryletheneColor change in a picture of a morning glory created with the composite color material due to light irradiation and the background color. © 2018 WILEY‐VCH Verlag GmbH
27/06/2018 Nagoya University
Regions: Asia, Japan
Keywords: Applied science, Technology, Science, Chemistry


For well over a decade, in my capacity as a researcher, broadcaster, and producer, I have relied heavily on Alphagalileo.
All of my work trips have been planned around stories that I've found on this site.
The under embargo section allows us to plan ahead and the news releases enable us to find key experts.
Going through the tailored daily updates is the best way to start the day. It's such a critical service for me and many of my colleagues.
Koula Bouloukos, Senior manager, Editorial & Production Underknown
We have used AlphaGalileo since its foundation but frankly we need it more than ever now to ensure our research news is heard across Europe, Asia and North America. As one of the UK’s leading research universities we want to continue to work with other outstanding researchers in Europe. AlphaGalileo helps us to continue to bring our research story to them and the rest of the world.
Peter Dunn, Director of Press and Media Relations at the University of Warwick
AlphaGalileo has helped us more than double our reach at SciDev.Net. The service has enabled our journalists around the world to reach the mainstream media with articles about the impact of science on people in low- and middle-income countries, leading to big increases in the number of SciDev.Net articles that have been republished.
Ben Deighton, SciDevNet

We Work Closely With...

  • BBC
  • The Times
  • National Geographic
  • The University of Edinburgh
  • University of Cambridge
Copyright 2021 by DNN Corp Terms Of Use Privacy Statement