In an inventive twist on air purification, researchers from the University of Cincinnati have created an air filter that imitates the function of human nose hair, trapping particles more effectively and with greater endurance than traditional filters. Jonathan Pham, Associate Professor at UC College of Engineering and Applied Science, along with doctoral student Sazzadul Rahat, have engineered these filters that cling to pollutants not unlike how wet sand adheres to our feet at the beach—a process governed by the sticky embrace of capillary force.
The groundbreaking technology applies a thin silicone oil coating to the filters, enhancing their ability to permanently trap airborne particulates. To thoroughly evaluate their potential, these filters were put through their paces in varied environments including an indoor baseball stadium, an office building, and an exhibition hall. Demonstrating remarkable efficiency, these filters reportedly outlasted their conventional counterparts by over double the lifespan, as reported by Chemical & Engineering News.
"The new air filter is a good example of biomimicry," Pham said in a conversation with the University of Cincinnati. "Your nose is kind of like an air filtration system. You breathe in a lot of pollen, dust and particulates. Your nose captures a lot of it before it gets into your lungs." These filters seem to be undaunted by wind gusts that typically reduce the efficacy of traditional filters, capturing substantially more particulates even when air currents reverse direction.
The research, published in Nature, was a collaborative effort including Professor Sanghyuk Wooh and student Junyong Park from Chung-Ang University in South Korea, with Park having spent time at UC to forward this joint research. Pham emphasized the essence of adhesion and interfaces in his statement to Chemical & Engineering News, according to the University of Cincinnati, "A big thing we care about in our group is adhesion and interfaces. The takeaway here is these small particles need to adhere to the filters really well. And our main contribution is to thoroughly understand that capillary adhesion."
In their lab, Pham and his students are not just sticking to theory. They utilize sophisticated tools such as atomic force and confocal microscopes to observe the materials at high resolution and measure the forces at play, ensuring that innovation and real-world application go hand in hand. With this achievement, it seems that a blend of natural inspiration and scientific precision has indeed cleared the air for the future of filtration technology.
