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New elastic material changes color in UV light

Date:
April 16, 2011
Source:
North Carolina State University
Summary:
Researchers have created a range of soft, elastic gels that change color when exposed to ultraviolet (UV) light -- and change back when the UV light is removed or the material is heated up.

The image to the left shows one of the photochromic gels before exposure to UV light. The image on the right shows the elastic material after exposure to UV light.
Credit: Image courtesy of North Carolina State University

Researchers from North Carolina State University have created a range of soft, elastic gels that change color when exposed to ultraviolet (UV) light -- and change back when the UV light is removed or the material is heated up.

The gels are impregnated with a type of photochromic compound called spiropyran. Spiropyrans change color when exposed to UV light, and the color they change into depends on the chemical environment surrounding the material.

The researchers made the gels out of an elastic silicone substance, which can be chemically modified to contain various other chemical compounds -- changing the chemical environment inside the material. Changing this interior chemistry allows researchers to fine-tune how the color of the material changes when exposed to UV light.

"For example, if you want the material to turn yellow when exposed to UV light, you would attach carboxylic acid," explains Dr. Jan Genzer, Celanese Professor of Chemical and Biomolecular Engineering at NC State and co-author of a paper describing the research. "If you want magenta, you'd attach hydroxyl. Mix them together, and you get a shade of orange."

Photochromic compounds are not new, but this is the first time they've been incorporated into an elastic material, without impairing the material's elasticity.

The researchers were also able to create patterns by using a shaped mold to change the chemical make-up of specific regions in the material. For example, applying hydroxyl around a star-shaped mold (like a tiny cookie cutter) on the material would result in a yellow star-shaped pattern appearing on a dark magenta elastic when it is exposed to UV light.

"There are surely applications for this material -- it's flexible, changes color in UV light, reverts to its original color in visible light, and can be patterned," Genzer says. "At this stage we have not identified the best application yet."


Story Source:

The above story is based on materials provided by North Carolina State University. Note: Materials may be edited for content and length.


Journal Reference:

  1. Hyun-Kwan Yang, A. Evren Ozcam, Kirill Efimenko and Jan Genzer. Photochromic materials with tunable color and mechanical flexibility. Soft Matter, April 2011

Cite This Page:

North Carolina State University. "New elastic material changes color in UV light." ScienceDaily. ScienceDaily, 16 April 2011. <www.sciencedaily.com/releases/2011/04/110414104217.htm>.
North Carolina State University. (2011, April 16). New elastic material changes color in UV light. ScienceDaily. Retrieved July 30, 2014 from www.sciencedaily.com/releases/2011/04/110414104217.htm
North Carolina State University. "New elastic material changes color in UV light." ScienceDaily. www.sciencedaily.com/releases/2011/04/110414104217.htm (accessed July 30, 2014).

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