Abstract.
Structural transitions triggered by p H in an aqueous micellar system comprising of a cationic surfactant (cetylpyridinium chloride) and an aromatic dibasic acid (phthalic acid) was investigated. Reversible switching between liquid-like and gel-like states was exhibited by the system on adjusting the solution p H. Self-assembled structures, responsible for the changes in flow properties were identified using rheology, light scattering techniques and cryogenic Transmission Electron Microscopy (cryo-TEM). High-viscosity, shear-thinning behavior and Maxwell-type dynamic rheology shown by the system at certain p H values suggested the growth of spheroidal/short cylindrical micelles into long and entangled structures. Light scattering profiles also supported the notion of p H-induced microstructural transitions in the solution. Cryo-TEM images confirmed the presence of spheroidal/short cylindrical micelles in the low-viscosity sample whereas very long and entangled thread-like micelles in the peak viscosity sample. p H-dependent changes in the micellar binding ability of phthalic acid is proposed as the key factor regulating the morphological transformations and related flow properties of the system.
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Rose J., L., Tata, B.V.R., Aswal, V.K. et al. pH-switchable structural evolution in aqueous surfactant-aromatic dibasic acid system. Eur. Phys. J. E 38, 4 (2015). https://doi.org/10.1140/epje/i2015-15004-9
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DOI: https://doi.org/10.1140/epje/i2015-15004-9