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Harkot J, Jańczuk B. Surface and volume properties of dodecylethyldimethylammonium bromide and benzyldimethyldodecylammonium bromide I. Surface properties of dodecylethyldimethylammonium bromide and benzyldimethyldodecylammonium bromide. J Colloid Interface Sci. 2008;331(2):494-9doi: 10.1016/j.jcis.2008.11.064.
Harkot, J., & Jańczuk, B. (2009). Surface and volume properties of dodecylethyldimethylammonium bromide and benzyldimethyldodecylammonium bromide I. Surface properties of dodecylethyldimethylammonium bromide and benzyldimethyldodecylammonium bromide. Journal of colloid and interface science, 331(2), 494-9. https://doi.org/10.1016/j.jcis.2008.11.064
Harkot, Joanna, and Jańczuk, Bronisław. "Surface and volume properties of dodecylethyldimethylammonium bromide and benzyldimethyldodecylammonium bromide I. Surface properties of dodecylethyldimethylammonium bromide and benzyldimethyldodecylammonium bromide." Journal of colloid and interface science vol. 331,2 (2009): 494-9. doi: https://doi.org/10.1016/j.jcis.2008.11.064
Harkot J, Jańczuk B. Surface and volume properties of dodecylethyldimethylammonium bromide and benzyldimethyldodecylammonium bromide I. Surface properties of dodecylethyldimethylammonium bromide and benzyldimethyldodecylammonium bromide. J Colloid Interface Sci. 2009 Mar 15;331(2):494-9. doi: 10.1016/j.jcis.2008.11.064. Epub 2008 Dec 06. PMID: 19095241.
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J Colloid Interface Sci. 2009 Mar 15;331(2):494-9. doi: 10.1016/j.jcis.2008.11.064. Epub 2008 Dec 06.

Surface and volume properties of dodecylethyldimethylammonium bromide and benzyldimethyldodecylammonium bromide I. Surface properties of dodecylethyldimethylammonium bromide and benzyldimethyldodecylammonium bromide.

Journal of colloid and interface science

Joanna Harkot, Bronisław Jańczuk

Affiliations

  1. Department of Interfacial Phenomena of Chemistry, Faculty of Chemistry, Maria Curie-Sk?odowska University, Maria Curie-Sk?odowska Sq. 3, 20-031 Lublin, Poland.

PMID: 19095241 DOI: 10.1016/j.jcis.2008.11.064

Abstract

Surface tension measurements were carried out for aqueous solutions of two cationic surfactants: dodecylethyldimethylammonium bromide (C(12)(EDMAB)) and benzyldimethyldodecylammonium bromide (BDDAB). Isotherms and thermodynamic adsorption parameters were determined from the surface tension data. Firstly, the surface excess concentration in the adsorbed monolayer and the total concentration of the surfactants were determined, then the standard free energy of adsorption was calculated by different methods. In the calculations, different orientations of the surfactants at the adsorbed monolayer were also taken into account. From the experimental and calculated data it results that the difference in the structure of the two cationic surfactants by changing the methyl group for aryl one in their heads causes an increase of the efficiency and a decrease of the effectiveness of adsorption at water-air interface, and that the standard free energy of adsorption can be predicted from the surface tension of the surfactants assuming the aryl group to be equivalent to 3.5 methylene groups. The experimentally obtained difference between the standard free energy of adsorption of the C(12)(EDMAB) and BDDAB was in good agreement with that theoretically accounted, corresponding to the standard free energy of adsorption of the aryl group. However, the best correlation between the values was obtained when a parallel orientation of the surfactant molecules at the adsorbed monolayer was taken into account.

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