Squid skin inspires heat-regulating coffee cup

This new material could insulate everything from shipping containers to restaurant to-go bags.

Inspired by squid skin, engineers at UC Irvine have created a cheap, easy-to-recycle material that can be “tuned” to regulate heat. As insulation for food and beverage packages, it could ensure that whatever is inside cools at the perfect rate.

The muse: Squid are able to quickly change color thanks to tiny, pigment-filled sacs in their skin called “chromatophores.” 

When a squid wants to change color — to escape a predator or sneak up on prey — it uses its muscles to expand or contract these sacs. That alters how light interacts with the pigments in them, which changes the squid’s appearance.

When the material is stretched, more heat escapes. When it’s relaxed, the transfer of heat slows.

The idea: The UC Irvine team’s material mimics the chromatophores in squid skin, but instead of regulating light, it regulates heat.

To create it, they deposited copper structures onto a flexible aluminum foil substrate, coated the structures with a polymer, and then delaminated the resulting material from the substrate.

When the material is stretched, the copper structures separate and let more heat escape from one side of the material to the other. When it’s relaxed, the structures come back together to slow the transfer of heat.

The applications: The UC Irvine team says the material could be used to insulate shipping containers, restaurant to-go bags, and parcel boxes containing perishable goods. In their paper, they demonstrate how it can be wrapped around cups to control how quickly beverages in them cool.

“You could have a temperature ‘ruler’ marked on the outside of the cup,” lead researcher Alon Gorodetsky explained to Freethink when asked about how consumers might use the material.

“Based on the temperature at which you want to drink your coffee at a specific time — say 150 degree Fahrenheit after 20 minutes — you could stretch and clip the material to a mark on the ruler that lets the coffee cool to the desired temperature at the right rate.”

“Now that we can make large sheets of it at a time, we have something that can benefit many aspects of our lives.”

Alon Gorodetsky

Scaling up: The basic materials cost just $.10 per square meter, and the price would go down as production scaled up. The squid skin-inspired​​ material is easy to recycle, too: to separate the copper from the foil, just add vinegar.

“We have been working with cephalopod-inspired adaptive materials and systems for years but previously have only been able to fabricate them over relatively small areas,” said Gorodetsky.  

“Now that we can make large sheets of it at a time, we have something that can benefit many aspects of our lives,” he added.

Update, 4/7/22, 11:40 a.m. ET: This article was updated with additional details on the material’s production process.

We’d love to hear from you! If you have a comment about this article or if you have a tip for a future Freethink story, please email us at [email protected].

Related
Playing sea soundscapes can summon thousands of baby oysters – and help regrow oyster reefs
Researchers amplified the natural sounds of the sea through underwater speakers to draw baby oysters to swim to the location.
New deep brain stimulator is powered automatically by breathing
A deep brain stimulator powered by breathing could eliminate the need for patients to undergo regular battery-change surgeries.
“SkinKit” lets ordinary people build their own “smart tattoos”
“SkinKit” smart tattoos are wearable devices that collect data directly from users’ bodies and display useful information in real time.
A new material called a mechanical neural network can learn and change its physical properties
The new material’s architecture is based on that of an artificial neural network – layers of interconnected nodes that can learn to do tasks.
Quantum computer designs heat-radiating window coating
Notre Dame researchers have used quantum computing to design a transparent window coating that reflects heat into the atmosphere.
Up Next
nimo smart glasses
Subscribe to Freethink for more great stories