Influence of Particle Parameters on Deposition onto Healthy and Damaged Human Hair

This study examines how various particle parameters affect their deposition on healthy and damaged human hair. It was found that particles have a stronger affinity for healthy hair due to the intact lipid layer, while damaged hair, with more hydrophilic sites, shows more dispersed binding. Hydrophilic silica particles localize along the cuticle edges of healthy hair due to hydrogen bonding, whereas electrostatic attractions are more effective at lower particle concentrations. Larger particles deposit poorly compared to smaller ones, and positively charged particles show stronger affinity, with highly charged particles depositing most rapidly. The study highlights the influence of particle-surface interactions and the impact of hair damage on particle deposition.