biostudies-literatureFu DNatural Science Foundation of Heilongjiang Province28799-28807https://www.ebi.ac.uk/biostudies/studies/S-EPMC9071189biostudies-literatureUnknown9(49)The micellization and surface activity properties of long-chain pyridinium ionic liquids <i>n</i>-alkyl-3-methylpyridinium bromide ([C _<i>n</i> mpy][Br], <i>n</i>: the carbon numbers of hydrophobic tails, <i>n</i> = 12, 14, 16) in aqueous solution were systematically investigated through electronic conductivity measurement, surface tension, and ultraviolet-absorption spectra. The surface chemical parameters and thermodynamics parameters were obtained. The [C _<i>n</i> mpy][Br] ionic liquids exhibit higher surface activities than conventional surfactants with corresponding alkyl chain lengths. The effects of inorganic salts (LiBr, NaBr, MgBr₂), organic alcohols (C₂H₅OH, C₃H₇OH, C₄H₉OH, C<sub>5<RSC advancesMicellization, surface activities and thermodynamics study of pyridinium-based ionic liquid surfactants in aqueous solution.PMC9071189LH2019B030Zhang WFu DXie YZhang XSui XGao XHuang BWang JSun YKan KfalseMicellization, surface activities and thermodynamics study of pyridinium-based ionic liquid surfactants in aqueous solution.The micellization and surface activity properties of long-chain pyridinium ionic liquids <i>n</i>-alkyl-3-methylpyridinium bromide ([C _<i>n</i> mpy][Br], <i>n</i>: the carbon numbers of hydrophobic tails, <i>n</i> = 12, 14, 16) in aqueous solution were systematically investigated through electronic conductivity measurement, surface tension, and ultraviolet-absorption spectra. The surface chemical parameters and thermodynamics parameters were obtained. The [C _<i>n</i> mpy][Br] ionic liquids exhibit higher surface activities than conventional surfactants with corresponding alkyl chain lengths. The effects of inorganic salts (LiBr, NaBr, MgBr₂), organic alcohols (C₂H₅OH, C₃H₇OH, C₄H₉OH, C<sub>5<2019-01-01T00:00:00Z2019 Sep2025-04-26T15:19:16.397Z2025-04-06T14:50:42.772ZS-EPMC90711893552965810.1039/c9ra04226a