Novel cellulose-based masks with improved breathability and additional disinfection effects

Purpose and goal A new filter concept based on functionalized cellulose with triboelectric effects to capture virus-containing aerosol droplets will be developed. High surface electric charge density promotes polarization of droplets and subsequent electrostatic trapping. The goal is to achieve equally high filter efficiency as conventional face masks, but with lower aerodynamic resistance for breathing. In order to enhance the surface charging, the cellulose fabric will be functionalized with a surface coating. The coating can provide additional functionality, such as self-disinfection. Expected results and effects Electrostatic trapping of droplets on the cellulose material will be achieved triboelectrically, due to the friction between materials by the breathing itself. It is known that females and children have different anatomy of the respiratory system compared with adult males, which will be taken into account. The use of renewable cellulose, instead of fossil-based synthetic polymers, as triboelectric material in filter applications would be highly beneficial from the viewpoints of national self-sufficiency, cost and waste management. Planned approach and implementation The project is a cooperation between Mid Sweden University (Miun), Uppsala University (UU), and the companies Domsjö Fabriker (DF), Scandinavian Nowoven (SN) and Camfil. Miun will coordinate the project. Different cellulose materials will be provided by DF and SN, modified and triboelectrically tested by Miun and UU. UU will simulate material design properties based on triboelectric performance and porosity. Camfil will do experimental testing according to international standards of particle/droplet retention and air flow, and assist in the design process.