As most of us have seen over the previous couple of years, face masks can generally be a hindrance – crucial although they’re. An experimental new masks, although, mechanically turns into simpler to breathe by way of when most air filtration is not required.
Designed by a crew of Korean scientists, the prototype masks incorporates two porous filter membranes – one on both facet of the wearer’s face – that are made up of electrospun elastomer nanofibers.
Every disc-shaped membrane is surrounded by and joined to a ring-shaped pneumatic stretching mechanism. That “stretcher” is in flip hooked as much as a light-weight moveable system that accommodates an air sensor, an air pump and a microcontroller chip. That system is itself wirelessly linked to an exterior pc working artificial-intelligence-based software program.
When the sensor detects a excessive focus of dangerous particles within the air, together with a comparatively regular charge of respiration on the a part of the consumer, the pc prompts the pump. This causes the stretcher ring to inflate and turn into fatter, which permits the related membrane to stay in a relaxed state. Because of this, the membrane’s pores keep at their smallest, providing the best diploma of filtration.
Nevertheless, if the sensor detects cleaner air – together with a sooner charge of respiration, akin to that which could accompany comparatively COVID-safe outside train – the software program prompts the stretcher to deflate. It thus will get skinnier, stretching the membrane because it does so. The pore dimension will increase consequently, permitting for simpler respiration.
What’s extra, assessments that had been carried out on volunteers indicated that even when the pores had been massive sufficient to considerably enhance the masks’s breathability, its air filtration effectivity dropped by solely six p.c.
Plans now name for the know-how to be made lighter, smaller and fewer cumbersome, which may contain putting off the pump and switching to a non-pneumatic stretching mechanism.
A paper on the analysis, which is being led by Seung Hwan Ko of Seoul Nationwide College, was not too long ago revealed within the journal ACS Nano.
Supply: American Chemical Society