Deuterium isotope effects on the interaction between hyperbranched polyethylene imine and an anionic surfactant

L. A. Bastardo, R. Mészáros, I. Varga, T. Gilányi, P. M. Cleasson

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Abstract

Solvent isotope effects on the interaction between the hyperbranched cationic polyelectrolyte, polyethylene imine (PEI), and the anionic surfactant sodium dodecyl sulfate (SDS) were investigated using potentiometric titration and eletrophoretic mobility measurements. In the basic pH range, a significantly higher fraction of the amine groups was found to be protonated when the PEI was dissolved in D2O compared to HiO at the same pH/pD. The difference in polymer charge in the two solvents decreases gradually with decreasing pH, and it completely diminishes at around pH = 4. Electrophoretic mobility measurements of PEI/SDS complexes at different pH values correlated very well with these observations. At pH/pD ≈ 9 a much higher mobility of the PEI/SDS complexes was found in D2O than in H2O at low surfactant concentrations, and the charge neutralization point shifted to a considerably larger surfactant concentration in heavy water. These results can be explained by the significantly higher charge density of the PEI in D2O compared to H2O. However, at the natural pH/pD as well as at pH = 4 and pD = 4 conditions the PEI molecules have roughly equal charge densities, which result in very similar charged characteristics (mobilities) of the PEI/SDS complexes as well as the same charge neutralization SDS concentration. It can be concluded that extreme care must be taken in the general analysis of those experiments in which weak polyelectrolyte/surfactant aggregates are investigated in heavy water, and then these observations are correlated with structures of the same system in water.

Original languageEnglish
Pages (from-to)16196-16202
Number of pages7
JournalJournal of Physical Chemistry B
Volume109
Issue number33
DOIs
Publication statusPublished - Aug 25 2005

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Imines
Anionic surfactants
Deuterium
Polyethylene
Isotopes
isotope effect
imines
Polyethylenes
polyethylenes
deuterium
Sodium dodecyl sulfate
surfactants
Sodium Dodecyl Sulfate
sodium sulfates
Surface-Active Agents
Deuterium Oxide
Heavy water
interactions
Surface active agents
heavy water

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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Deuterium isotope effects on the interaction between hyperbranched polyethylene imine and an anionic surfactant. / Bastardo, L. A.; Mészáros, R.; Varga, I.; Gilányi, T.; Cleasson, P. M.

In: Journal of Physical Chemistry B, Vol. 109, No. 33, 25.08.2005, p. 16196-16202.

Research output: Contribution to journalArticle

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