Effect of Spacer Length on the Specificity of Counterion-Cationic Gemini Surfactant Interaction
DOI:
https://doi.org/10.6000/1929-5030.2012.01.01.3Keywords:
Gemini surfactants, counterions, spacer length, ion specificity, surface pressure.Abstract
Aqueous solutions of three dicationic quaternary N,N-dimethylammonium gemini surfactants with identical hydrocarbon tails (N-hexadecyl) separated by flexible two, four, and six carbon atom spacers (di-, tetra-, and hexamethylene), abbreviated as G2, G4, and G6, respectively, were characterized using dynamic light scattering (DLS), Langmuir balance, differential scanning calorimetry (DSC), and microscopy in the presence of varying concentrations of sodium salts of fluoride, chloride, bromide, and iodide. Clear dependence on the counterion species was evident in the surface activity of the geminis, as follows. In 0.1 mM salt minima in surface tension and hence presumably the highest affinity for G2, G4, and G6 were observed with fluoride/chloride, bromide, and iodide, respectively. This same ion specificity of G2, G4, and G6 was evident also in the changes of average hydrodynamic diameters (Zav) with temperature. More specifically, maximum in Zav for G2 was observed in 100 mM NaCl, for G4 in 100 mM NaBr, and for G6 in 1 mM NaI. Our results demonstrate that spacer length has a profound impact on the interaction of these surfactants with halide counter-ions of different sizes, controlling the organization of these cationic geminis in the presence of salt. Importantly, our studies show that adjusting the headgroup structure it is possible to design amphiphiles, which can be used to bind specific metal ions in solution, for purposes such as water purification and mineral enrichment.References
[1] Eldridge JW, Piret EL, Continuous-flow stirred-tank reactor system I. Design equations for homogeneous liquid phase reactions, Experimental data. Chem Eng Prog 1950; 46: 290.
[2] Shatyski JJ, Hanesian D. Adiabatic kinetics studies of the cytidine/acetic anhydride reaction by utilizing temperature versus time data. Ind Eng Chem Res 1993; 32: 594. http://dx.doi.org/10.1021/ie00016a004
[3] Haji S, Erkey C. Kinetics of hydrolisis of acetic anhydride by in situ FTIR spectroscopy. Chem Eng Ed 2005; 56-61.
[4] Cosmetic Ingredient Review Expert Panel Bindu Nair, Final Report on the Safety Assessment of Benzyl Alcohol, Benzoic Acid, and Sodium Benzoate. Int J Tox 2001; 20(Suppl 3): 23- 50.Atkins PW. Physical chemistry, Oxford, Melbourne, Tokyo: Oxford University Press, cop. 1998.
[6] Vas Bhat R, Kuipers J, Versteeg G. Mass transfer with complex chemical reaction in gas–liquid system: two-steps reversible reactions with unit stoichio-metric and kinetic orders. Chem Eng J 2000; 76: 127-52. http://dx.doi.org/10.1016/S1385-8947(99)00104-7
[7] Simmie JM. Detailed chemical kinetic models for the combustion of hydrocarbon fuels. Prog Energy Combust Sci 2003; 29: 599-34. http://dx.doi.org/10.1016/S0360-1285(03)00060-1
[8] Elliott L, Ingham DB, Kyne AG, Mera NS, Pourkashanian M, Wilson CW. Generic algorithms for optimisation of chemicalkinetics reaction mechanisms. Prog Energy Combust Sci 2004; 30: 297-28. http://dx.doi.org/10.1016/j.pecs.2004.02.002
[9] Heinichen H, Heyl A, Rutsch O, Weichmann J. Modeling of the coplex chemicalkinetics of the thermal decomposition of tetrachloromethane in methane. Chem Eng Sci 2001; 56: 1381-86. http://dx.doi.org/10.1016/S0009-2509(00)00361-4
[10] Smith JM, Ness HCV. Introduction to Chemical Engineering Thermodynamics, McGraw-Hill 1975.
[11] Poling BE, Prausnitz JM, O’Connell JP. The Properties of Gases and Liquids, McGraw-Hill 2000.
[12] Weinan E, Liu D, Vanden-Eijnden E. Nested stochastic simulation algorithm for chemical kinetic systems with disparate rates. J Chem Phys 2005; 123.
[13] Gibson MA, Bruck J. Efficient exact stochastic simulation of chemical systems with many species and many channels. J Phys Chem 2000; 104: 1876-89. http://dx.doi.org/10.1021/jp993732q
[14] McQuarrie DA. Stochastic approach to chemicalkinetics. J Appl Probab 1967; 4: 413-78. http://dx.doi.org/10.2307/3212214
[15] Delogu F, Monagheddu M, Mulas G, Schiffini L, Cocco G. Some kinetic features of mechanical alloying transformation processes. J Non-Cryst Solids 1998; 383-89. http://dx.doi.org/10.1016/S0022-3093(98)00550-X
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Published
2012-10-15
How to Cite
Sood, R., Alakoskela, J.-M., Sood, A., Vitovic, P., & Kinnunen, P. K. (2012). Effect of Spacer Length on the Specificity of Counterion-Cationic Gemini Surfactant Interaction. Journal of Applied Solution Chemistry and Modeling, 1(1), 13–24. https://doi.org/10.6000/1929-5030.2012.01.01.3
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