Counterion Nature and Alkylammonium Halide Adsorption Thermodynamics

Two surfactants were synthesized by reacting hydrogen halides (hydrogen chloride and hydrogen bromide) with 1-dodecylamine. The resultant cationic surfactants, 1-dodecylammonium chloride (DDAC) and 1-dodecylammonium bromide (DDAB), were characterized by NMR spectrometry and FTIR spectroscopy and dat...

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Bibliographic Details
Published in:Journal of dispersion science and technology 2009-07, Vol.30 (7), p.1046-1049
Main Authors: Dantas, T. N. C., Wanderley Neto, A. O., Moura, E. F., Scatena, H., Fonseca, J. L. C.
Format: Article
Language:English
Subjects:
Adsorption
bubble surface tensiometry
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
hydrogen bromide
hydrogen chloride
Micelles. Thin films
Surface physical chemistry
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Summary:Two surfactants were synthesized by reacting hydrogen halides (hydrogen chloride and hydrogen bromide) with 1-dodecylamine. The resultant cationic surfactants, 1-dodecylammonium chloride (DDAC) and 1-dodecylammonium bromide (DDAB), were characterized by NMR spectrometry and FTIR spectroscopy and data related to their adsorption at the fluid liquid/gas interface were obtained employing bubble surface tensiometry, in pure water and in HCl 0.1 M. Data did not fit well to Langmuir isotherm but Frumkin isotherm did adequately describe to process of adsorption. Adsorption isotherms, as well as data related to critical micelle concentration, CMC, indicated that in HCl 0.1 M, the presence of electrolytes and a common ion to DDAC decreased chloride solvation, changing surface packing and adsorption profile for this surfactant.
ISSN:0193-2691
1532-2351
DOI:10.1080/01932690802598747