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Microstructural study of cetyltrimethylammonium bromide / 1-butanol / salt / water system — SANS and 2D-NOESY analysis

K. Kuperkar,^a A. Patriati,^b E.G.R. Putra,^b K. Singh,^c D.G. Marangoni,^c P. Bahadur^a

^aDepartment of Chemistry, Veer Narmad South Gujarat University, Surat 395 007, India.

^bNeutron Scattering Laboratory, National Nuclear Energy Agency of Indonesia, BATAN, Kawasan Puspiptek Serpong, Tangerang 15314, Indonesia.

^cDepartment of Chemistry, St. Francis Xavier University, Antigonish, NS B2G 2W5, Canada.

Published on the web 1 March 2012.

Received May 25, 2011. Accepted August 19, 2011.

Canadian Journal of Chemistry, 2012, 90(3): 314-320, https://doi.org/10.1139/v11-155

Abstract

Interaction of 1-butanol (BuOH) with a cationic surfactant, cetyltrimethylammonium bromide (CTAB) aggregate, in water and salt solution has been studied by viscometry, small-angle neutron scattering (SANS), and 2D-NMR techniques. The experimental results are interpreted in terms of a possible micellar growth occurring in the presence of added alcohol and salt. It was observed that the addition of BuOH strongly influences the viscosity of the CTAB/salt micellar system, reaching a peak viscosity at about 0.5% w/v of BuOH over a range of salt concentrations. Scattering measurements support the idea of a structural transformation by the observation of a spectral shift (broadening) as the total concentration of surfactant varies, indicating a decrease in the intermicellar distance and narrow size distribution. The chemical shift from ¹H NMR measurements gave complementary data on the solubilization of BuOH in CTAB micelles, whereas the expected locus (site) of the additive added to the surfactant including the dynamics of the molecules in micellar aggregates were successfully correlated by significant and positive cross peaks obtained from two-dimensional nuclear Overhauser effect spectroscopy (2D-NOESY).

Keywords: micellar growth, solubilization, viscosity, SANS, 2D-NOESY

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