The Kinetics of Moisture Sorption by Hair
November 2024
in “
International Journal of Cosmetic Science
”
TLDR Hair absorbs moisture differently based on its structure and treatment, with changes occurring at 30% humidity.
The study investigates the kinetics of moisture sorption by human hair, using dynamic vapor sorption (DVS) to analyze untreated and treated hair, as well as separated cuticle and cortex. The research introduces a time-dependent rate constant to describe moisture sorption kinetics, highlighting the role of chain entanglement in hair fibers and the impact of cosmetic treatments. A significant finding is the transition at around 30% relative humidity, indicating structural changes in hair that allow more water molecule accommodation. The study concludes that analyzing sorption kinetics, alongside hysteresis, provides a comprehensive understanding of hair moisture management, including the influence of fiber density on the sorption process.
