| Sep 10, 2025 |
Cat whiskers guide scientists to smarter, tougher wearable sensors
Inspired by cat whiskers, researchers develop novel biomass fiber aerogels, featuring exceptional pressure sensitivity and rapid response times.
(Nanowerk News) Flexible sensors that can pick up even the faintest touch are vital for health tracking, sports training, and human–machine interactions. But most current designs fall short, struggling with weak sensitivity, limited durability, and poor long-term stability.
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A research team from Shinshu University in Japan may have found a solution—by looking to cats for inspiration. Led by Associate Professor Chunhong Zhu, the group developed a new pressure sensor made from biomass fibers and sodium alginate aerogels that mimic the extraordinary sensing abilities of cat whiskers.
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| Inspired by cat vibrissae, biomimetic biomass PHFs/SA aerogels (BFAs) are developed via precursor-assisted in situ polymerization and freeze-synergistic assembly. These ultralight, porous pressure sensors exhibit high sensitivity and excellent durability, enabling pulse detection, handwriting recognition, Morse code transmission, and notably real-time monitoring of badminton movements, offering a sustainable solution for smart wearable sports electronics. They can be effectively employed for human physiological monitoring, as well as motion analysis in sports. (Image: Dr. Chunhong Zhu, Shinshu University) (click on image to enlarge)
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Cats rely on their whiskers, or vibrissae, to detect subtle changes in their surroundings. These hairs are anchored in specialized follicle-sinus complexes that amplify and translate mechanical signals into nerve activity. Zhu’s team used the same principle, designing a lightweight aerogel structure where hemp-based fibers act like whiskers and porous cavities replicate the sinus complexes. The result is a system that converts tiny pressures into reliable electrical signals.
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To build the sensor, the researchers coated tough, eco-friendly hemp fibers with polyaniline, giving them strong conductivity and resilience. These treated fibers were then combined with sodium alginate through a freeze-assembly process to form an ultralight, highly porous aerogel. The design allows the fibers to bend and register changes whenever the material is compressed, producing rapid, accurate responses.
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Tests showed the sensor could withstand repeated use while maintaining high sensitivity and a fast reaction time of just 255 milliseconds. It successfully captured human pulse signals, tracked body movements, and even distinguished handwriting and Morse code. In a sports trial, the device detected pressure changes during different badminton serves, hinting at applications in performance training when built into accessories or racket grips.
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The project also points toward a greener future for wearable electronics. Unlike carbon-based aerogels that require energy-intensive processing, the new approach avoids high-temperature treatments and offers a scalable, eco-friendly alternative.
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“This design provides a sustainable path to highly sensitive pressure sensors that can be used for health monitoring and sports analytics,” Zhu said.
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The study, co-authored with Ph.D. student Dandan Xie, was published in Advanced Functional Materials ("Cat‐Vibrissa‐Inspired Biomass Fiber Aerogels for Flexible and Highly Sensitive Sensors in Monitoring Human Sport").
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