Bioinspired capillary force-driven super-adhesive filter

Junyong Park, Chan Sik Moon, Ji Min Lee, Sazzadul A. Rahat, Sang Moon Kim, Jonathan T. Pham, Michael Kappl, Hans-Jürgen Butt and Sanghyuk Wooh ()
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Junyong Park: Chung-Ang University
Chan Sik Moon: Chung-Ang University
Ji Min Lee: Chung-Ang University
Sazzadul A. Rahat: University of Cincinnati
Sang Moon Kim: Incheon National University
Jonathan T. Pham: University of Cincinnati
Michael Kappl: Max Planck Institute for Polymer Research
Hans-Jürgen Butt: Max Planck Institute for Polymer Research
Sanghyuk Wooh: Chung-Ang University

Nature, 2025, vol. 643, issue 8071, 388-394

Abstract: Abstract Capturing particles with low, nanonewton-scale adhesion is an ongoing challenge for conventional air filters1,2. Inspired by the natural filtration abilities of mucus-coated nasal hairs3,4, we introduce an efficient, biomimetic filter that exploits a thin liquid coating. Here we show that a stable thin liquid layer is formed on several filter media that generates enhanced particulate adhesion, driven by micronewton to sub-micronewton capillary forces5,6. Enhanced particle adhesion increases the filtration of airborne particulates while maintaining air permeability, providing longer filter lifetime and increased energy savings. Moreover, strong adhesion of the captured particles enables effective filtration under high-speed airflow as well as suppression of particle redispersion. We anticipate that these filters with thin liquid layers afford a new way to innovate particulate matter filtering systems.

Date: 2025
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DOI: 10.1038/s41586-025-09156-y

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