Multi-Responsive Wormlike Micelles Based on N-alkyl-N-Methylpiperidinium Bromide Cationic Surfactant

A noncovalent bonding method was utilized for forming multiresponsive surface-active ionic liquids in mixed N -alkyl- N -methylpiperidinium bromide (C 16 MDB) and potassium phthalic acid (PPA). Rheology, cryogenic-transmission electron microscopy, dynamic light scattering and nuclear magnetic resonance were used to investigate the aggregation property of surface-active ionic liquids in aqueous solution. The efficiency of the shielding effect in the form of hydrophobic effects and electrostatic attraction between PPA and the C 16 MDB headgroup under diverse pH conditions is found to be the root cause of a shift in the aggregate's morphological transformation. In addition, the molecular motion of surfactant molecules becomes more active as the temperature increase provides the property of thermoresponsive to the surface-active ionic liquid system.