Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Multilayer nanofibre face mask helps to combat pollution

14.05.2014

Researchers at the Hong Kong Polytechnic University have developed a ground-breaking filter technology that guards against the finest pollutants in the air.

Haze is usually composed of pollutants in the form of tiny suspended particles or fine mists/droplets emitted from vehicles, coal-burning power plants and factories. Continued exposure increases the risk of developing respiratory problems, heart diseases and lung cancer. Can we avoid the unhealthy air?


Professor Wallace Woon-Fong Leung, a renowned filtration expert, and his team from the Department of Mechanical Engineering at PolyU have successfully developed a simple face mask which can block out suspended particles.

Copyright : The Hong Kong Polytechnic University

A simple face mask that can block out suspended particles has been developed by scientists from the Department of Mechanical Engineering at the Hong Kong Polytechnic University (PolyU). The project is led by Professor Wallace Woon-Fong Leung, a renowned filtration expert, who has spent his career understanding these invisible killers.

In Hong Kong, suspended particles PM 10 and PM 2.5 are being monitored. PM 10 refers to particles that are 10 microns (or micrometres) in size or smaller, whereas PM 2.5 measures 2.5 microns or smaller. At the forefront of combating air pollution, Professor Leung targets ultra-fine pollutants that have yet been picked up by air quality monitors – particles measuring 1 micron or below, which he perceived to be a more important threat to human health.

“In my view, nano-aerosols (colloid of fine solid particles or liquid droplets of sub-micron to nano-sizes), such as diesel emissions, are the most lethal for three reasons. First, they are in their abundance by number suspended in the air. Second, they are too small to be filtered out using current technologies. Third, they can pass easily through our lungs and work their way into our respiratory systems, and subsequently our vascular, nervous and lymphatic systems, doing the worst kind of harm.”

However, it would be difficult to breathe through the mask if it were required to block out nano-aerosols. To make an effective filter that is highly breathable, a new filter that provides high filtration efficiency yet low air resistance (or low pressure drop) is required.

According to Professor Leung, pollutant particles get into our body in two ways – by the airflow carrying them and by the diffusion motion of these tiny particles. As the particles are intercepted by the fibres of the mask, they are filtered out before reaching our lungs.

Fibres from natural or synthetic materials can be made into nanofibres around 1/500 of the diameter of a hair (about 0.1 mm) through nanotechnologies. While nanofibres increase the surface area for nano-aerosol interception, they also incur larger air resistance. Professor Leung’s new innovation aims to divide optimal amount of nanofibres into multiple layers separated by a permeable space, allowing plenty of room for air to pass through.

A conventional face mask can only block out about 25% of 0.3-micron nano-aerosols under standard test conditions. Professor Leung said: “The multi-layer nanofibre mask can block out at least 80% of suspended nano-aerosols, even the ones smaller than 0.3 micron. In the meantime, the wearer can breathe as comfortably as wearing a conventional face mask, making it superb for any outdoor occasions. Another option is to provide a nanofiber mask that has the same capture efficiency as conventional face mask, yet it is at least several times more breathable, which would be suitable for the working group.”

The new filtration technology has been well recognized. Recently, Professor Leung and his team won a Gold Medal and a Special Merit Award from the Romania Ministry of National Education at the 42nd International Exhibition of Inventions of Geneva held in Switzerland.

If the breakthrough is turned into tightly-fit surgical masks, they are just as effective against bacteria and viruses whose sizes are under 1 micron. “In the future, medical professionals at the frontline can have stronger protection against deadly bacteria and viruses,” added Professor Leung.

In addition, a new gas purifying technology is under development to convert harmful pollutant gases, such as NOx and volatile organic compound, to harmless substances including acids, carbon dioxide and water vapour.

Going beyond personal protection, the filtration and purifying technologies when combined can also clean the air in buildings and improve indoor air quality. Professor Leung said they could make air-purifying filters that are easily fitted into old and new buildings, without any extra supporting structures or additional costs. Therefore, the potential is limitless; air-purifying filters can also be installed in the cabins of airplanes, vehicles, trains and ships. Such a handy solution can be the way of future for “cleaner and healthier” air.

Associated links

The Hong Kong Polytechnic University | Research SEA News
Further information:
http://www.polyu.edu.hk/ife/corp/en/publications/tech_front.php?tfid=8167
http://www.researchsea.com

Further reports about: Multilayer Polytechnic bacteria conventional droplets lungs micron particles pollutant resistance vehicles viruses

More articles from Innovative Products:

nachricht Rapid Detection of Cracks and Corrosion using Magnetic Stray Flux
28.04.2015 | Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren IZFP

nachricht Winter Hack: Textured Rubber that Grips Slick, Icy Surfaces
18.03.2015 | American Institute of Physics (AIP)

All articles from Innovative Products >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: X-rays and electrons join forces to map catalytic reactions in real-time

New technique combines electron microscopy and synchrotron X-rays to track chemical reactions under real operating conditions

A new technique pioneered at the U.S. Department of Energy's Brookhaven National Laboratory reveals atomic-scale changes during catalytic reactions in real...

Im Focus: Iron: A biological element?

Think of an object made of iron: An I-beam, a car frame, a nail. Now imagine that half of the iron in that object owes its existence to bacteria living two and a half billion years ago.

Think of an object made of iron: An I-beam, a car frame, a nail. Now imagine that half of the iron in that object owes its existence to bacteria living two and...

Im Focus: Thousands of Droplets for Diagnostics

Researchers develop new method enabling DNA molecules to be counted in just 30 minutes

A team of scientists including PhD student Friedrich Schuler from the Laboratory of MEMS Applications at the Department of Microsystems Engineering (IMTEK) of...

Im Focus: Bionic eye clinical trial results show long-term safety, efficacy vision-restoring implant

Patients using Argus II experienced significant improvement in visual function and quality of life

The three-year clinical trial results of the retinal implant popularly known as the "bionic eye," have proven the long-term efficacy, safety and reliability of...

Im Focus: Lasers for Fast Internet in Space – Space Technology from Aachen

On June 23, the second Sentinel mission was launched from the space mission launch center in Kourou. A critical component of Aachen is on board. Researchers at the Fraunhofer Institute for Laser Technology ILT and Tesat-Spacecom have jointly developed the know-how for space-qualified laser components. For the Sentinel mission the diode laser pump module of the Laser Communication Terminal LCT was planned and constructed in Aachen in cooperation with the manufacturer of the LCT, Tesat-Spacecom, and the Ferdinand Braun Institute.

After eight years of preparation, in the early morning of June 23 the time had come: in Kourou in French Guiana, the European Space Agency launched the...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

World Conference on Regenerative Medicine in Leipzig: Last chance to submit abstracts until 2 July

25.06.2015 | Event News

World Conference on Regenerative Medicine: Abstract Submission has been extended to 24 June

16.06.2015 | Event News

MUSE hosting Europe’s largest science communication conference

11.06.2015 | Event News

 
Latest News

Offshore wind park Westermost Rough officially inaugurated

01.07.2015 | Press release

Siemens Velaro train wins "Red Dot" award

01.07.2015 | Awards Funding

Liquids on Fibers - Slipping or Flowing?

01.07.2015 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>