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Issue 33, 2019
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Structural properties of the evolution of CTAB/NaSal micelles investigated by SANS and rheometry

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Abstract

Surfactants are amphiphilic molecules that spontaneously self-assemble in aqueous solution into various ordered and disordered phases. Under certain conditions, one-dimensional structures in the form of long, flexible wormlike micelles can develop. Cetyltrimethylammonium bromide (CTAB) is one of the most widely studied surfactants, and in the presence of sodium salicylate (NaSal), wormlike micelles can form at very dilute concentrations of surfactant. We carry out a systematic study of the structures of CTAB/NaSal over a surfactant concentration range of 2.5–15 mM and at salt-to-surfactant molar ratios of 0.5–10. Using small-angle neutron scattering (SANS), we qualitatively and quantitatively characterize the equilibrium structures of CTAB/NaSal, mapping the phase behavior of CTAB/NaSal at low concentrations within the region of phase space where nascent wormlike micelles transition into long and entangled structures. Complementary rheological assessments not only demonstrate the significant influence of the inter-micellar Coulombic interaction on the micellar structure but also suggest the potential existence of a hierarchical structure which is beyond the accessibility of the SANS technique.

Graphical abstract: Structural properties of the evolution of CTAB/NaSal micelles investigated by SANS and rheometry

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Publication details

The article was received on 21 May 2019, accepted on 02 Aug 2019 and first published on 07 Aug 2019


Article type: Paper
DOI: 10.1039/C9CP02868D
Phys. Chem. Chem. Phys., 2019,21, 18346-18351

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    Structural properties of the evolution of CTAB/NaSal micelles investigated by SANS and rheometry

    C. N. Lam, C. Do, Y. Wang, G. Huang and W. Chen, Phys. Chem. Chem. Phys., 2019, 21, 18346
    DOI: 10.1039/C9CP02868D

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