This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: Respiratory infectious diseases and air pollution remain persistent global health challenges. Yet the tools used to monitor airborne threats are often expensive, power-hungry and difficult to deploy outside laboratories.
Now, researchers at the Technical Institute of Physics and Chemistry of the Chinese Academy of Sciences have turned to an unlikely teacher for a solution: a butterfly. Inspired by a special drinking behavior observed in nature, the research team has developed a new pump-free airborne sampling technology that operates entirely without external power and costs as little as $0.12 per disposable unit. The technology, known as Film-Rupture Actuated Capillary Enrichment (FACE), was recently reported in Proceedings of the National Academy of Sciences.
According to the researchers, by using a bioinspired physical mechanism, FACE offers a simpler, lower-cost and more accessible approach to collecting airborne samples than conventional pump-based systems. Most butterflies drink nectar through a long, straw-like proboscis. But researchers did not fully understand how liquid moves through the proboscis.
Using X-ray imaging, researchers discovered that a coiled butterfly proboscis can trap a thin suspended liquid film at its center. As the film becomes thinner and thinner, it eventually reaches a critical point and suddenly ruptures. In that instant, the surface energy stored in the liquid film is released, driving the remaining liquid rapidly into the feeding tube—almost as if an invisible hand were guiding it forward.
The process happens in milliseconds, requires no muscles and consumes virtually no energy. Instead, it relies on a fundamental force of nature: surface tension. This phenomenon led the researchers to ask: Could a bursting liquid film replace a mechanical pump?
To test the idea, the researchers created a miniature biomimetic system using low-cost 3D printing. Roughly the size of a coin, the device contains a ring-shaped liquid film connected to tiny capillary channels that mimic the transport pathway inside a butterfly's proboscis. During sampling, the liquid film is exposed to the surrounding air.
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