Respiratory source control using surgical masks with nanofiber media

Area of Science:

• Materials Science
• Aerosol Science
• Public Health

Background:

• Face masks are crucial for Respiratory Source Control to limit infectious aerosol transmission.
• Improving mask comfort and effectiveness can enhance compliance and reduce disease spread.
• Nanofiber filtration technology offers potential for enhanced mask performance.

Purpose of the Study:

• To evaluate a novel nanofiber face mask for improved breathability and filtration.
• To compare the performance of nanofiber masks against conventional surgical masks and N95 respirators.
• To assess the impact of nanofiber masks on airflow resistance, filtration efficiency, and aerosol exposure.

Main Methods:

• Utilized a ventilated manikin model in a calibrated exposure chamber with radiolabeled test aerosols.
• Measured mask airflow resistance (pressure difference), filtration efficiency, and aerosol transfer (exposure).
• Compared nanofiber masks, conventional surgical masks, and N95 respirators using Schlieren optical imaging for airflow visualization.

Main Results:

• Nanofiber masks exhibited significantly lower airflow resistance compared to conventional surgical masks and N95 respirators.
• Filtration and receiver exposure levels for nanofiber masks were comparable to N95 respirators.
• Schlieren imaging showed enhanced airflow through the nanofiber mask compared to conventional masks.

Conclusions:

• Replacing conventional filter media with nanofiber material reduces airflow resistance and enhances filtration.
• Nanofiber masks provide Respiratory Source Control efficacy similar to N95 respirators.
• Improved comfort and efficacy of nanofiber masks may increase compliance and reduce disease transmission.