Thu Sep 19 06:02:00 UTC 2024: ## Squid-Inspired Magnetic Screen Displays Encrypted Images Without Electronics
Scientists at the University of Michigan have created a flexible screen that uses magnetic fields instead of electronics to display images, inspired by the color-changing skin of squids. This groundbreaking technology allows for encrypted image storage and display, offering potential applications in various fields like security, camouflage, and even e-readers.
The screen utilizes a swarm of specially engineered nanoparticles called magnetoactive Janus particles (MAJP). These particles have two distinct sides, one containing iron oxide nanoparticles and the other containing titanium oxide pigment. By applying different magnetic fields, researchers can control the orientation of these particles, switching them between “on” (white) and “off” (orange) states, effectively creating pixels.
The researchers highlight the potential for encryption. A public image can contain multiple private images, each requiring a unique magnetic key for decryption. This means only authorized individuals with the correct key can reveal the hidden information.
“This device can be programmed to show specific information only when the right keys are provided,” said Professor Abdon Pena-Francesch, co-author of the study. “And there is no code or electronics to be hacked.”
This new technology, reminiscent of an Etch-A-Sketch, could revolutionize information display and security. Its flexible nature allows for use on clothing, stickers, and even e-readers, making it a promising candidate for future applications.
The study was published in the journal Advanced Materials.
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