Recharging N95 masks using a van de Graaff generator for safe recycling

Area of Science:

• Materials Science
• Electrostatics
• Public Health

Background:

• N95 respirators are critical for filtering virus aerosols during pandemics like COVID-19.
• Standard sterilization methods degrade the electrostatic charges essential for N95 respirator efficacy.
• Hospital shortages necessitate effective N95 respirator recycling strategies.

Purpose of the Study:

• To investigate a novel method for restoring the electrostatic properties of N95 respirators after sterilization.
• To evaluate the feasibility of using a van de Graaff generator for N95 respirator recharging.
• To confirm the restoration of N95 respirator filtering function post-recharge.

Main Methods:

• Sterilization of N95 respirators using common methods that compromise electrostatic charges.
• Recharging of sterilized N95 respirators using a van de Graaff generator.
• Assessment of the recovered electrostatic charges and filtration efficiency.

Main Results:

• Sterilization significantly reduces the electrostatic charges in N95 respirator melt-blown polypropylene.
• Van de Graaff generator treatment effectively restores lost electrostatic charges.
• Recharged N95 respirators demonstrated restored filtration capabilities.

Conclusions:

• A van de Graaff generator offers a safe, cost-effective, and rapid method for N95 respirator recharging.
• This technique successfully recovers electrostatic charges, thereby restoring the masks' critical filtering performance.
• The findings support the recycling and reuse of N95 respirators, addressing critical supply shortages.