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Hassan, P.A. et al.

Hassan, Bhattacharya, Kulshreshtha, Raghavan,

Microrheology of wormlike micellar fluids from the diffusion of colloidal probes.

The microrheology of cationic micellar solutions has been investigated as a function of added organic salts using quasielastic light scattering (QELS). Two organic salts, sodium p-toluene sulfonate and sodium salicylate, were used to induce microstructural changes in cetyl trimethylammonium bromide (CTAB) micelles. The mean-squared displacement (MSD) of polystyrene probe particles embedded in CTAB micellar solutions was monitored by QELS in the single-scattering regime. Through the use of the generalized Stokes-Einstein relationship, the frequency-dependent complex shear moduli of each fluid were estimated from the Laplace transform of the corresponding MSD. The salt-induced transition from nearly spherical to elongated wormlike micelles and consequent changes in fluid response from viscous to viscoelastic are clearly captured by microrheology.[1]

References

Microrheology of wormlike micellar fluids from the diffusion of colloidal probes. Hassan, P.A., Bhattacharya, K., Kulshreshtha, S.K., Raghavan, S.R. The journal of physical chemistry. B, Condensed matter, materials, surfaces, interfaces & biophysical. (2005) [Pubmed]

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