Air-Filtering Masks for Respiratory Protection from PM_2.5 and Pandemic Pathogens

Area of Science:

• Materials Science
• Chemical Engineering
• Public Health

Background:

• Air-filtering masks (respirators) are critical for protecting against fine particulate matter (PM2.5) and airborne pathogens, notably during pandemics like COVID-19.
• The filtration layer, composed of fibrous media, is the most crucial component determining mask efficacy.

Purpose of the Study:

• To provide a comprehensive overview of the development of fibrous media for air filtration applications.
• To synthesize key factors influencing the filtration performance of fibrous materials.
• To highlight emerging research opportunities in air filtration technologies.

Main Methods:

• Literature synthesis on factors affecting fibrous media filtration performance.
• Focus on meltblown and electrospinning as primary fabrication techniques for fibrous media.
• Review of methods for imparting electrostatic charge to enhance electret filter performance.

Main Results:

• Identified key factors influencing the filtration efficiency and performance of fibrous media.
• Detailed the principles and applications of meltblown and electrospinning fabrication methods.
• Emphasized the significant role of electrostatic charges in electret filters for improved particle capture.

Conclusions:

• The development of advanced fibrous media is essential for effective air filtration and protection against airborne hazards.
• Meltblown and electrospinning offer versatile platforms for creating high-performance filtration materials.
• Further research into electret technologies and novel fabrication methods holds promise for next-generation air-filtering masks.