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Mimicking bug eyes could brighten reflective signs, clothes

Date:
November 30, 2016
Source:
American Chemical Society (ACS)
Summary:
That bright, reflective coating used on road signs, bicycles and clothing are important safety measures at night. They help drivers get to their destinations while avoiding bicyclists and pedestrians in low-light conditions. Now, inspired by the structure of insect eyes, scientists have developed new materials that could improve the color and effectiveness of these safeguards.
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The structure of bug eyes (top) has inspired bright, vividly colored reflective materials (bottom). The structure of bug eyes (top) has inspired bright, vividly colored reflective materials (bottom).
Credit: American Chemical Society

That bright, reflective coating used on road signs, bicycles and clothing are important safety measures at night. They help drivers get to their destinations while avoiding bicyclists and pedestrians in low-light conditions. Now, inspired by the structure of insect eyes, scientists have developed new materials that could improve the color and effectiveness of these safeguards. Their report appears in the ACS journal Langmuir.

Retroreflective materials, including some tapes and road paints, work by bouncing light back toward the original source, such as a car's headlights, making them bright and easy to see. Existing retroreflectors are usually made with glass microbeads and microprisms. Dyes, pigments or plastic layers are often added for color; however, they tend to reduce the reflection of light, and the colors can fade over time. Hongta Yang and colleagues turned to the compound eyes of insects for a new way to address these limitations.

The researchers evenly coated an array of glass microspheres with smaller balls of silica. The result is a brilliantly colored, retroreflective material. The color can be adjusted by changing the size of the silica crystals, and brightness can be boosted by adding layers. At 250 nanometers and 40 layers deep, the crystals appeared bright green and reflected more light than commercial coatings with no color. In addition to boosting the brightness of objects for safety reasons, researchers say that by reflecting rather than absorbing light, the material could be applied to buildings to reduce the urban heat-island effect.


Story Source:

Materials provided by American Chemical Society (ACS). Note: Content may be edited for style and length.


Journal Reference:

  1. Kuan-Yi Tsao, Hui-Ping Tsai, Kun-Yi Andrew Lin, Yi-Xuan He, Hongta Yang. Self-Assembled Hierarchical Arrays for Colored Retroreflective Coatings. Langmuir, 2016; DOI: 10.1021/acs.langmuir.6b03329

Cite This Page:

American Chemical Society (ACS). "Mimicking bug eyes could brighten reflective signs, clothes." ScienceDaily. ScienceDaily, 30 November 2016. <www.sciencedaily.com/releases/2016/11/161130104154.htm>.
American Chemical Society (ACS). (2016, November 30). Mimicking bug eyes could brighten reflective signs, clothes. ScienceDaily. Retrieved May 23, 2017 from www.sciencedaily.com/releases/2016/11/161130104154.htm
American Chemical Society (ACS). "Mimicking bug eyes could brighten reflective signs, clothes." ScienceDaily. www.sciencedaily.com/releases/2016/11/161130104154.htm (accessed May 23, 2017).

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