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- W2085207310 abstract "Dilution induced changes in the microstructure and rheological behavior of micelles formed by a cationic surfactant–anionic hydrotrope mixture has been investigated in the hydrotrope-rich region. The surfactant used is cetyltrimethylammonium bromide (CTAB) and the hydrotropic salt is sodium 3-hydroxy naphthalene 2-carboxylate (SHNC). The concentration of the mixture is varied from 0.5% to 10.0% w/w (ϕ = 0.005–0.100) at a fixed weight ratio of hydrotrope to surfactant (85:15). Rheological studies indicate Newtonian flow behavior at low and high volume fractions (0.005 and 0.100) while a shear thinning behavior is observed at intermediate volume fractions. The zero-shear viscosity η0 also passes through a maximum upon changes in the concentration. The most striking feature in our study is that a low viscosity Newtonian fluid transforms to a viscoelastic fluid, upon dilution, and then again to a Newtonain fluid. Small angle neutron scattering studies of 10.0% micellar solution show the presence of rod-like aggregates. Upon dilution, the scattering intensity per unit concentration shows an increase in the low q-region. The nature of pair distance distribution function and subsequent model fitting indicates a transition from rod-like micelles to unilamellar vesicles upon dilution. This behavior is explained in terms of the volume fraction dependant solubilization of hydrotropes in the rod-like micelles and consequent changes in the composition of the mixed micelles." @default.
- W2085207310 created "2016-06-24" @default.
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- W2085207310 date "2011-07-01" @default.
- W2085207310 modified "2023-09-22" @default.
- W2085207310 title "Dilution induced thickening in hydrotrope-rich rod-like micelles" @default.
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- W2085207310 doi "https://doi.org/10.1016/j.jcis.2011.03.061" @default.
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