Micellar Structure Changes in Aqueous Mixtures of Nonionic Surfactants
Abstract:
Rheology and small-angle neutron scattering (SANS) are used to probe the
structure of nonionic surfactant mixtures of triblock copolymers
(Pluronics) and a C_14 diol (Surfynol 104) in water. Small amounts of
Surfynol 104 incorporate into the existing Pluronic micelles and cause
enormous rheological changes when added to aqueous solutions of some
Pluronics with certain molecular compositions. The hydrophobic C_14
diol is only soluble up to 0.1wt% in pure water, but can be added in
large quantities to aqueous solutions of the Pluronics. Particularly, a
structural transition from spherical to wormlike micelles in solution
has been identified by SANS to be responsible for the rheological
changes in the mixture of Pluronic P105 and the C_14 diol.
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