Supra-long chain surfactants with double or triple quaternary ammonium headgroups

► Supra-long chain surfactants composed of C18-C22 and two or three headgroups. ► Their water solubility is improved by introducing additional hydrophilic groups. ► Their cmcs are smaller than the corresponding gemini and bolaform surfactants. ► Their adsorption is lower slightly at the air/water interface than comparable regular surfactants. ► Their behavior is because of the curved supra-long chain and the electrostatic repulsion between headgroups.