Diffusion-controlled evaporation of sodium dodecyl sulfate solution drops placed on a hydrophobic substrate

► The effect of SDS on the diffusion-controlled evaporation rate was investigated. ► SDS did not alter water evaporation rate, only evaporation mode was changed. ► The constant contact angle mode was operative up to 80 mM SDS concentration. ► Lucassen-Reynders approach was applied to determine SDS adsorption on solid surface. ► An equation was developed to compare evaporation rates of drops with different θi.