In Situ Tensile Deformation Characterization of Human Hair with Atomic Force Microscopy

This study utilized atomic force microscopy (AFM) to examine the response of human hair fibers, particularly the cuticle structure, to tensile stress. The research compared virgin, chemically damaged, mechanically damaged, and conditioner-treated hair samples. Key findings included the ability to systematically track deformation and morphological changes in hair fibers, the distinct stress-strain behavior of human hair, and the impact of chemical and mechanical damage on hair's tensile properties. The study highlighted the importance of understanding cuticle damage for developing targeted hair repair products.