Researchers at the Technical Institute of Physics and Chemistry of the Chinese Academy of Sciences have developed a butterfly-inspired air sampling technology that requires no pump or external power source and costs just $0.12 per disposable unit, according to the team.
The system, called Film-rupture-Actuated Capillary Enrichment, or FACE, was inspired by a peculiar liquid-feeding behavior observed in butterflies. It was described in a recent paper published in the Proceedings of the National Academy of Sciences.
The researchers said the bioinspired physical mechanism behind FACE offers a simpler, cheaper and more accessible way to collect atmospheric samples than conventional pump-based systems.
Why current air monitoring falls short
Respiratory infectious diseases and air pollution remain persistent global health challenges, but the tools used to monitor airborne threats are often expensive, power-hungry and difficult to deploy outside laboratories, the researchers noted. FACE was designed to work entirely without external energy.
Built to withstand real-world conditions
According to the researchers, the technology can operate under demanding real-world conditions. They found that the liquid-film sampler remained effective even in strong air currents, making it suitable for mounting on agricultural drones to collect pesticide residue over crops. That capability could let farmers quickly assess airborne pesticide exposure and make better-informed decisions about field safety.
A potential tool for disease monitoring
The researchers said the system could prove even more valuable for monitoring infectious diseases by capturing bioaerosols exhaled from the mouth and nose. Because the lightweight FACE collector can be positioned close to a person's face, it allows for fast, contact-free collection before the aerosols dilute into the surrounding air.
In experiments targeting the nucleocapsid protein of SARS-CoV-2, the FACE platform achieved a detection sensitivity 100 times higher than that of conventional pump-based aerosol samplers, the researchers reported.
They also noted that traditional systems lose material through tubing, recovery steps and sample dilution. FACE avoids those losses by integrating collection, recovery, enrichment and detection into a single workflow. As a result, collection and recovery efficiencies approached 100 percent, while the overall dilution rate was just 1.14, according to the researchers.
