New material with programmable colorimetric responses can behave more like animal skins.
Features include unusual color changes and high touch sensitivity
A new film made of gold nanoparticles changes color in response to any type of movement. Its unprecedented qualities could allow robots to mimic chameleons and octopi — among other futuristic applications.
Unlike other materials that try to emulate nature’s color changers, this one can respond to any type of movement, like bending or twisting. Robots coated in it could enter spaces that might be dangerous or impossible for humans, and offer information just based on the way they look.
For example, a camouflaged robot could enter tough-to-access underwater crevices. If the robot changes color, biologists could learn about the pressures facing animals that live in these environments.
Although some other color-changing materials can also respond to motion, this one can be printed and programmed to display different, complex patterns that are difficult to replicate. The UC Riverside scientists who created this nanomaterial documented their process in a Nature Communications paper published this past week.
Nanomaterials are simply materials that have been reduced to an extremely small scale — tens of nanometers in width and length, or, about the size of a virus. When materials like silver or gold become smaller, their colors will change depending on their size, shape, and the direction they face.
“In our case, we reduced gold to nano-sized rods. We knew that if we could make the rods point in a particular direction, we could control their color,” said chemistry professor Yadong Yin. “Facing one way, they might appear red. Move them 45 degrees, and they change to green.”
The problem facing the research team was how to take millions of gold nanorods floating in a liquid solution and get them all to point in the same direction to display a uniform color.
Their solution was to fuse smaller magnetic nanorods onto the larger gold ones. The two different-sized rods were encapsulated in a polymer shield, so that they would remain side by side. That way, the orientation of both rods could be controlled by magnets.
“Just like if you hold a magnet over a pile of needles, they all point in the same direction. That’s how we control the color,” Yin said.
Once the nanorods are dried into a thin film, their orientation is fixed in place and they no longer respond to magnets. “But, if the film is flexible, you can bend and rotate it, and will still see different colors as the orientation changes,” Yin said.
Other materials, like butterfly wings, are shiny and colorful at certain angles, and can also change color when viewed at other angles. However, those materials rely on precisely ordered microstructures, which are difficult and expensive to make for large areas. But this new film can be made to coat the surface of any sized object just as easily as applying spray paint on a house.
Though futuristic robots are an ultimate application of this film, it can be used in many other ways. UC Riverside chemist Zhiwei Li, the first author on this paper, explained that the film can be incorporated into checks or cash as an authentication feature. Under normal lighting, the film is gray, but when you put on sunglasses and look at it through polarized lenses, elaborate patterns can be seen. In addition, the color contrast of the film may change dramatically if you twist the film.
The applications, in fact, are only limited by the imagination. “Artists could use this technology to create fascinating paintings that are wildly different depending on the angle from which they are viewed,” Li said. “It would be wonderful to see how the science in our work could be combined with the beauty of art.”
The Latest Updates from Bing News & Google News
Go deeper with Bing News on:
- Nicolas Cage wanted his new horror film changed so it had more reptiles in iton February 20, 2021 at 6:50 am
Nicolas Cage was instrumental in ensuring his new film 'Willy's Wonderland' was full of his favourite animals.
- 10 Movies Proving Takashi Miike can Direct Anythingon February 18, 2021 at 7:47 pm
Throughout his career, Takashi Miike was always considered a director-for-hire, meaning he would undertake almost any project he was commissioned to do. The result is that the films in his vast ...
- 5 Artists That Make Rainbow-Colored Masterpieces Using NASA-Developed Dichroic Glasson February 18, 2021 at 2:06 pm
Dichroic light filters can filter light from a white light source to produce light that looks as though it’s highly saturated in color. When used on glass, artists are able to create beautiful objects ...
- ‘The Masked Singer’ Season 5 costumes, judges and hosts: Meet Grandpa Monster and Chameleonon February 17, 2021 at 7:53 pm
Season 5 of Fox’s wild and wacky reality TV show “The Masked Singer” is set to premiere March 10, 2021. Nick Cannon was diagnosed with Covid-19 near the beginning of production, so he was replaced by ...
- Every Peter Jackson Film Ranked Worst To Beston February 13, 2021 at 10:13 am
Jackson is a chameleon behind the camera. On the one hand, he's held in high esteem for his attention to detail and ability to seek out the beauty in his film's most important sequences.
Go deeper with Google Headlines on:
Go deeper with Bing News on:
- Five Sullivan Brothers Convention Center on track to open for conferences in late summeron February 26, 2021 at 4:30 am
Full-fledged conferences could return to the renovated Five Sullivan Brothers Convention Center as early as August, officials said Thursday. Officials from design and engineering firm ISG said work on ...
- Sneaker Culture Merges into the Fast Laneon February 26, 2021 at 2:15 am
What happens when sneakerheads get ahold of a luxury sport sedan? RTFKT creative collective and Lexus teamed up to find out.
- Thermochromic Materials Market Size to Reach USD 2.51 Billion by 2027; CAGR of 9.2% | Reports And Dataon February 24, 2021 at 2:55 am
Increasing demand in the smart packaging application, coupled with the growing demand for product differentiation and improved appearance of products, are ...
- In step toward autonomous materials, researchers design patterns in self-propelling liquid crystalson February 18, 2021 at 4:00 pm
To create autonomous materials that can be used in technologies, scientists needed to find a way to have these materials self-propel their defects while controlling the direction of the movement.
- Boston Bruins not the only ones playing outside. Backyard rink boom in New Englandon February 17, 2021 at 2:07 am
There’s been a boom of backyard rinks, especially this winter in the midst of a pandemic. With so many restrictions, they have become a safe haven.