0

September 4, 2016 AT 5:00 am

Strain-induced color changes: Taking a clue from jellyfish and squid #Biomimicry #Biohacking

1468847285451

Researchers have developed material whose appearance can be reversibly altered by microscopic cracks and folds, via C&EN

Taking a clue from jellyfish and squids that quickly alter their appearance via muscle-controlled morphology changes in their bodies’ surface structures, researchers have designed polymeric materials that change appearance reversibly in response to mechanically induced folds and deformations

The animals exploit their color-changing abilities for camouflage and safety purposes. Scientists could use the new synthetic materials for those applications or as mechanical sensors, optical switches, and color-changing smart windows. The researchers, led by Luyi Sun of the University of Connecticut, made several types of so-called mechanochromic materials by depositing a transparent rigid film made from polyvinyl alcohol and a silicate compound on a flexible polydimethylsiloxane (PDMS) substrate. Stretching the simple bilayer material by 40% changes its appearance markedly yet reversibly from transparent to opaque. The optical changes result from stretch-induced microscopic cracks and folds that trap and scatter light. The team varied the material design to induce other optical effects. For example, they bonded an ultraviolet-shielding film to PDMS doped with a variety of fluorophores. Stretches and strains as small as 5% caused these materials to quickly change colors or change from nonluminescent to highly luminescent.

See more


Check out all the Circuit Playground Episodes! Our new kid’s show and subscribe!

Have an amazing project to share? Join the SHOW-AND-TELL every Wednesday night at 7:30pm ET on Google+ Hangouts.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Learn resistor values with Mho’s Resistance or get the best electronics calculator for engineers “Circuit Playground”Adafruit’s Apps!


Maker Business — SoftBank Invests $300 Million in WeWork

Wearables — Impatience reward

Electronics — Cool your FETs!

Biohacking — What I Learned from VO2 Testing in Ketosis

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !



No Comments

No comments yet.

Sorry, the comment form is closed at this time.