Study on the Surface Properties and Aggregation Behavior of Quaternary Ammonium Surfactants with Amide Bonds

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Abstract
A number of techniques, including conductivity, surface tension, dynamic light scattering, transmission electron microscopy, and 1H nuclear magnetic resonance (1H NMR), Fourier transform infrared (FT-IR), and 1H–1H 2D nuclear Overhauser effect spectroscopy (1H–1H 2D NOESY), have been used to investigate the effect of amide bonds on the interfacial and assembly properties of a cationic surfactant, N-anilinoformylmethyl-N-cetyl-N,N-dimethyl ammonium chloride (AMC-C16), in aqueous solutions. The adsorption of AMC-C16 has been found to be much better than that of the conventional cationic surfactant, benzyl cetyldimethylammonium chloride (BAC-16) at the air/water interface and in solution. The surface tension measurements show the presence of two critical aggregation concentrations (CAC1 and CAC2) for AMC-C16. The presence of a strong intermolecular hydrogen bond of AMC-C16 was confirmed by 1H NMR and FT-TR. The molecular interactions of AMC-C16 were detected by 1H–1H 2D NOESY. The results show that the rigid group (phenyl) of AMC-C16 was partially overlapped with its alkyl chain in aqueous solution, and the possible aggregation behavior for AMC-C16 was proposed. The effects of an inorganic salt (NaCl) and an organic salt (C6H5COONa) to the aggregates of AMC-C16 have been discussed.
Funding Information
  • National Natural Science Foundation of China (21978140)
  • Special Subject of Plant Food Processing Technology of Scientific Research Project of Heilongjiang Province Department of Education of China (YSTSXK201848)
  • Natural Science Foundation of Heilongjiang Province (LH2019B021)
  • Scientific Research Project of Heilongjiang Province Department of Education of China (135409303)
  • Qiqihar University Graduate Innovation Fund Grants of China (YJSCX2018-ZD07)

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