Valves on N95 Masks Do Not Filter Exhaled Droplets

Matthew Staymates, fluid dynamicist at the National Institute of Standards and Technology, is studying different mask types to determine which are the most effective at reducing disease transmission. In Physics of Fluids, he describes exploring the basic flow dynamics of N95 masks with or without exhalation valves. To do this, he generates stunning video from his schlieren imaging, a method to visualize the fluid flow away from the surface of an object, and light scattering.

Read more

Henry Ford Health System Study Demonstrates UV-C Light is Effective for Killing COVID-19 on N95s

Dermatology researchers at Henry Ford Health System, in collaboration with a team at the University of Michigan, have demonstrated that certain N95 respirators tainted with COVID-19 can be effectively and safely decontaminated for reuse using ultraviolet-C light (UV-C), a method commonly utilized for treating rare skin diseases.

Researchers say the outside and inside of the facemasks were decontaminated in a prototype phototherapy unit that dispenses a UV-C dosing level high enough to effectively kill the virus in less than two minutes while still preserving the facemask’s breathability, fit and overall integrity.

Read more

Researchers Create Mask Filtration Effectiveness Hierarchy

Infection prevention experts at the UNC Medical Center set out to gather evidence on the fitted filtration efficiency of dozens of different types of masks and mask modifications, including masks sterilized for reuse, expired masks, novel masks sourced from domestic and overseas sources, and homemade masks.

Read more

Helping protect medical professionals

A media comprised of a sandwich of materials, tested by Sandia National Laboratories, is being manufactured into N95-like respirators that could be used in local medical facilities. The project originated from the urgent need for personal protective equipment when the COVID-19 outbreak began.

Read more

Biomedical engineers to test ultraviolet light’s ability to kill coronavirus

The idea of UV sterilization is not a new one, but little or no scientific data about its potency against COVID-19 have been collected, until now. Thanks to a one-year, $182,728 grant from the National Science Foundation, researchers at Binghamton University, State University of New York are beginning to test UV’s effectiveness.

Read more