Inhaling microscopic air pollutants may be inevitable, but a new bioinspired air filter from Chung-ang University researchers may change that. The team is designed to mimic the viscosity efficiency of mucosal-coated nose hairs Particle Coating (Pro) Filter Air filtration is greatly improved by capillary adhesion particles compared to the weak forces used in conventional filters.
Borrowed from biology to deal with air pollution
Standard air filters rely on Van der Waals’ power – miniature, short-distance attractions usually fail to retain fine dust and pollen. Inspired by how our nose hair uses mucus to penetrate particles, the Pro filter uses a thin layer of silicone oil to achieve stronger grip through capillary strength.
The oil is chemically bonded to specially treated filter fibers using a polymer “brush” to form a stable coating without blocking the airflow. Results: Filter better without increasing resistance tradeoffs.
Stronger, cleaner, long-lasting filtering
Pro filters show great benefits when tested in labs and in real-world HVAC systems:
- 10–30% increase in filtration efficiency of PM1.0, PM2.5 and PM10 particles
- Stable performance is stable even under strong or reverse airflow
- Cleanable and reapply for reuse
- Lifespan is twice as long as traditional filters
- Energy consumption in HVAC systems is reduced by about 20%
Energy-saving “sticky” innovation
Since the silicone layer is more tightly attached to the particles, the filter can resist recontamination even during the airflow. “This is the first example of suppressing dust redispersion and a multi-directional filtration strategy proposed by a zero-energy filtration system using natural wind,” said Dr. Sanghyuk Wooh, who led the study.
Unlike filters that quickly clog and require frequent replacement, the Pro filter is constructed to prevent pore blockage. It can even be used without a fan – ideal for places like subway tunnels or outdoor smoking areas.
On-site preparation and environmentally friendly
In HVAC field tests, Pro filtering outperformed the standard filter, lasting twice as long and reducing fan energy use by up to 27%. Crucially, they also capture more dust while creating less waste, an environmentally friendly upgrade with practical advantages.
Magazine: nature
doi: 10.1038/s41586-025-09156-y
release: June 18, 2025
Related
If our report has been informed or inspired, please consider donating. No matter how big or small, every contribution allows us to continue to provide accurate, engaging and trustworthy scientific and medical news. Independent journalism takes time, energy, and resources – your support ensures that we can continue to reveal the stories that matter most to you.
Join us to make knowledge accessible and impactful. Thank you for standing with us!
