Surface properties of aliphatic, alicyclic, and aromatic amines in aqueous and saline solutions

The surface properties of amines with different molecular structures, including an aliphatic amine (alkylammonium chloride), an alicyclic amine (alkylmorpholine), and an aromatic amine (benzethonium chloride), were investigated in aqueous and sodium chloride solutions. The critical micelle concentration, surface activity, adsorption at the solution/air interface, and the minimum area occupied by an amine molecule at the interface were determined. It was shown that the critical micelle concentration decreases, while surface activity and adsorption at the surfactant solution/air interface increase when transitioning from aliphatic to alicyclic and aromatic amines, and also in the presence of a low-molecular-weight electrolyte.

1. Holmberg K., Jönsson B., Kronberg B., Lindman B. Surfactants and Polymers in Aqueous Solution. John Wiley & Sons, Ltd, 2002. https://doi.org/10.1002/0470856424

2. Rusanov A. I., Shchekin A. K. Micelle Formation in Surfactant Solutions. 3rd ed. Saint Petersburg, Lan’ Publ., 2022. 612 p. (in Russian).

3. Volkov V. A., Shchukina E. L., Amarlui A., Ageev A. A., Kukleva K. K., Eleev A. F. Molecular stratification nanotechnology in antiadhesive modification of fabric fibres. Fibre Chemistry, 2008, vol. 40, pp. 127–135. https://doi.org/10.1007/s10692-008-9024-7

4. Ermolaeva V. A. Chemical Structure of the Basic Components of Synthetic Detergents. Sovremennye naukoemkie tekhnologii = Modern High Technologies, 2007, no. 10, pp. 34–38 (in Russian).

5. Dikhtievskaya L. V., Shlomina L. F., Osipova E. O., Shevchuk V. V., Mozheyko F. F. Flotation enrichment of potash ores of different mineralogical composition. Vestsi Natsyyanal’nai akademii navuk Belarusi. Seryya khimichnykh navuk = Proceedings of the National Academy of Sciences of Belarus. Chemical series, 2018, vol. 55, no. 3, pp. 277–287 (in Russian). https://doi.org/10.29235/1561-8331-2019-55-3-277-287

6. Mozheiko F. F., Dikhtievskaya L. V., Goncharik I. I., Shevchuk V. V. Regulation of Foaming of Surfactants in Inorganic Electrolyte Solutions. Vestsi Natsyyanal’nai akademii navuk Belarusi. Seryya khimichnykh navuk = Proceedings of the National Academy of Sciences of Belarus. Chemical series, 2018, vol. 54, no. 1, pp. 37–45 (in Russian). https://doi.org/10.29235/1561-8331-2018-54-1-37-45

7. Laskowski J. S. From amine molecules adsorption to amine precipitate transport by bubbies: A potash ore flotation mechanism. Minerals Engineering, 2013, vol. 45, pp. 170–179. https://doi.org/10.1016/j.mineng.2013.02.010

8. Draft screening assessment – Aliphatic Amines Group Environment and Climate Change Canada Health Canada – March 2021. Government of Canada. Available at: https://www.canada.ca/en/environment-climate-change/services/evaluating-existing-substances/draft-screening-assessment-aliphatic-amines-group.html (15 May 2025).

9. Zhang C., Geng T., Jiang Y., Zhao L., Ju H., Wang Y. Impact of NaCl concentration on equilibrium and dynamic surface adsorption of cationic surfactants in aqueous solution. Journal of Molecular Liquids, 2017, vol. 238, pp. 423–429. https://doi.org/10.1016/j.molliq.2017.05.033

10. Wang X., Chen C., Binder K., Kuhn U., Pöschl U., Su H., Cheng Y. Molecular dynamics simulation of the surface tension of aqueous sodium chloride: from dilute to highly supersaturated solutions and molten. Atmospheric Chemistry and Physics, 2018, vol. 18, iss. 23, pp. 17077–17086. https://doi.org/10.5194/acp-18-17077-2018

11. Phan Chi M. Relationship between Molecular Structure and Surface Activity of Surfactants: A Molecular Dynamics Study. Journal of Physical Chemistry B, 2024, vol. 128, iss. 47, pp. 11839–11845. https://doi.org/10.1021/acs.jpcb.4c05527

12. Lange K. R. Surfactants: Synthesis, Properties, Analysis, Application. St. Petersburg, Professiya Publ., 2004. 240 p. (in Russian).

13. Tensiometer K100 MK2/SF/C, Instruction Manual V2-05: KRÜSS. GmbH, Hamburg, 2001–2005. 153 p.

14. Opanasenko O. N., Yakovets N. V., Krut’ko N. P. Surface Properties of Anion-Oriented Zwitterionic Surfactants Based on Amines and Carboxylic Acids. Vestsi Natsyyanal’nai akademii navuk Belarusi. Seryya khimichnykh navuk = Proceedings of the National Academy of Sciences of Belarus. Chemical Series, 2017, no. 3, pp. 29–37 (in Russian).