"PFAS Surfactant Behavior in Aqueous Film Forming Foams" 

Nicole Franklin, MSE PhD Candidate 

Advisors: Professors Jefrrey Youngblood & Carlos Martinez

WebEx Link

ABSTRACT

Per- and polyfluoroalkyl substances (PFAS) have been used in many applications, such as pharmaceuticals, cosmetics, and aqueous film-forming foams (AFFF). However, the widespread use of PFAS has resulted in their release into the environment. Due to their strong C-F bonds and high thermal stability, PFAS do not break down and will bioaccumulate in plants and wildlife. PFAS play a critical role in aqueous film forming foams and are vital in extinguishing fuel fires. While a positive spreading coefficient is often used to gauge AFFF effectiveness, recent studies show conflicting results with film formation and vapor suppression, urging a deeper understanding of these systems. Siloxane surfactants are emerging as a promising PFAS replacement, but their success varies depending on molecular structure. This presentation aims to inform on fundamental mechanisms governing surfactant behaviors and discuss gaps in the literature that can be used to develop safer and more sustainable firefighting foam formulations.