Dilute sodium dodecyl sulfate droplets impact on micropillar-arrayed non-wetting surfaces

Impinging dilute sodium dodecyl sulfate (SDS) droplets on micropillar-arrayed polydimethylsiloxane surfaces were experimentally investigated. It was found that the behaviors of impinging greatly depend surface roughness and SDS concentration. Similar to pure water droplets, there exists a narrow range dimensionless Weber number, We, for complete rebound impacting droplets. The lower upper limits impact velocity theoretically analyzed compared with experimental data. addition could shorten contact time bouncing Besides, has little influence maximum spreading factor while concentration an obvious nearly follows scaling law We1/4.