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A naturally occurring dye compound presents a new opportunity for color-changing paints

A groundbreaking study published in Advanced Science reveals that a naturally occurring dye compound found in cephalopods’ skin, such as octopuses and squid, has the potential to create innovative paints that change color in response to light. These paints, developed using a synthetic version of the cephalopod dye, can transition between yellow and red when exposed to strong light. The researchers also found that additional colorants could be mixed with the paint to expand its color-shifting possibilities.

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Reinventing natural materials through cephalopods’ color-changing power

The natural world provides numerous examples of materials that change color, from the renowned chameleons of the rainforest to the remarkable cephalopods residing in the depths of the ocean. Xanthommatin, a natural pigment found in the chromatophores of cephalopods, enables these animals to swiftly modify their skin’s appearance. Manipulating these tiny sacs filled with xanthommatin nanoparticles allows the cephalopods to achieve vibrant and rapid color changes without extensive external stimuli. Inspired by nature’s fascinating ability, researchers are eager to develop a comparable color-changing material for human use.

Overcoming the challenges of creating a human-friendly color-changing material was a primary objective for the team at the Kostas Research Institute (KRI) at Northeastern University. Their success in previous projects involving color-changing materials, such as wearable patches that change color when exposed to excessive sunlight, motivated their pursuit of a material based on the rapid and reversible color changes observed in cephalopods.

Unveiling the secrets of a color-changing paint

The researchers focused on titanium dioxide, a well-known molecule used in white paints and plastics, as a potential catalyst for achieving color change. By incorporating xanthommatin into a water-based polyurethane paint, along with varying particle sizes of titanium dioxide, they developed a paint that transitioned from red to yellow upon exposure to sunlight. Importantly, when the light source was removed, the paint swiftly reverted to its original red color.

Further investigation uncovered that titanium dioxide acted as a conductor for the color change, with the particle size and density of the titanium oxide particles influencing the speed and intensity of the transition. Astonishingly, the color change of this new paint occurred in as little as five minutes and could persist for up to 24 hours, depending on the duration of light exposure.

Moreover, the researchers discovered the intriguing capability of creating complex images within the paint by selectively masking certain regions of a material coated with the color-changing paint. Over time, these masked areas gradually faded, leaving visible negative images resembling the shapes of the masks used. Even intricate mask designs, including the Northeastern University wolf mascot and a university logo featuring small Latin text, were clearly discernible following this masking procedure.

The ease of production of this paint, taking as little as two hours, further adds to its appeal. Moreover, the colorant recipe is compatible with both water-based and oil-based paints.

Expanding the potential of color-changing paints

Beyond their role as temporary artwork tools, color-changing paints have the potential to serve as a more environmentally friendly alternative to traditional colored paints, according to the researchers. Conventional paints often contain harmful chemicals, emit toxic fumes, and can negatively impact human health and the environment. Seeking a natural approach to paint production fosters a safer environment for painters and reduces the risk of environmental contamination.

Building upon their groundbreaking research, the team at Northeastern University aims to enhance color-changing paints by expanding their color palette and exploring alternative color change properties, such as faster or slower transition rates.

The role of AI legalese decoder in ensuring compliance and protecting intellectual property

As the development of color-changing paints progresses, legal implications and the protection of intellectual property rights becomes crucial. Here, AI legalese decoder emerges as an invaluable tool. By leveraging its advanced AI capabilities, it can assist researchers and organizations in comprehending and navigating the complex legal terminology and requirements associated with patents and intellectual property. This technology ensures compliance and safeguards valuable innovations.

Reference: Martin CL, Flynn KR, Kim T, Nikolic SK, Deravi LF, Wilson DJ. ColorÔÇÉchanging paints enabled by photoresponsive combinations of bioÔÇÉinspired colorants and semiconductors. Adv Sci. doi: 10.1002/advs.202302652

This content is an expanded version of a press release issued by Northeastern University, offering additional insights and information related to the original study.

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