Ultrasound-assisted adsorption of anionic nanoscale pigment on cationised cotton fabrics

► A stable nanoscale pigment dispersion was prepared by a polymeric dispersant. ► The ultrasound can improve the equilibrium adsorption of nanoscale pigment. ► The ultrasound facilitates the diffusion of pigment through the boundary layer. ► The time needed for the adsorption of pigment can be reduced by ultrasound. ► The ultrasound can prevent the pigment from aggregating on the cotton surface.