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Multilayer Nanofibre Filter - Nanoaerosols Capture and Added Functions

Distinguished Project_Nanofibre Technologies

Low-pressure drop filter for effective nanoaerosol filtration, VOC conversion and bacteria killing

Due to the small sizes, nanoaerosols (diesel particulates, laser-printer particles; viruses; and small bacteria) can get into our respiratory, vascular, lymphatic and nervous systems, leading to various chronic diseases.

The multilayer nanofibre filter using multiple thin nanofibre layers, each supported by a permeable scrim material, attains high-capture efficiency of nanoaerosols. It also has a lower pressure drop compared to the case in which all nanofibres are packed in a single-layer.

By functionalising the nanofibre layer(s), gaseous pollutants can be converted to harmless substances while bacteria can be killed. These functions cannot be achieved with conventional coarse microfibre filters.

Special Features and Advantages

  • The multilayer nanofibre filter has a low pressure drop.
  • Nano-pollutants and viruses can be filtered by multilayer nanofibre filter far more effectively than conventional microfibre filter.
  • Each nanofibre layer can have different added functions, for examples:

  - Layer(s) with TiO2-composite nanofibres under visual light (including room light) convert pollutant gases (Volatile Organic Compound, NO, etc.) to harmless substances, and

- Chitosan nanofibres, when wetted (for example: sweat), kill bacteria

Applications

  • Face masks for surgeons, and workers who labour and sweat
  • Respirators for the general public and care professionals under epidemics
  • Cabin filters for airplanes, vehicles, trains and ships
  • Ventilation filters for indoor areas (auditoriums, classrooms, gymnasiums, offices, etc.)

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