Thermal-stability of mixed giant micelles of alkyltrimethylammonium surfactants and salicylate

► Giant micelles promote hydrodynamic drag reduction (HDR). ► Thermal synergism in mixed giant micelle was investigate using such property. ► The HDR is lost if the micelles is thermally broken. ► Synergism increases if a shorter surfactant is combined with a longer. ► This is due to the better packing of the molecules that form the mixed micelles.