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| - Solvation Dynamics in Aqueous Polymer Solution and in Polymer−Surfactant Aggregate
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| - Solvation dynamics of 2,6-p-toluidinonaphthalene sulfonate (TNS) is studied using picosecond time-resolvedemission spectroscopy in an aqueous solution of poly(vinylpyrrolidone) (PVP) and in a polymer−surfactantaggregate consisting of PVP and sodium dodecyl sulfate (SDS). On addition of PVP to an aqueous solutionof TNS, the emission quantum yield (φf) of TNS increases about 210 times in 0.75 wt % aqueous solutionof PVP. The solvation dynamics of TNS in 0.75 wt % aqueous solution of PVP is found to be biexponentialwith a major component (85%) of 60 ps and a slower one of 800 ps (15%). The retardation of the solvationdynamics in the dilute polymer solution compared to that in the bulk water is attributed to the restrictedmovement of water molecules in the vicinity of the polymer chains. The solvation dynamics of TNS in thePVP−SDS aggregate is described by two components, 300 ± 20 ps (55%) and 2500 ± 100 ps (45%). Theslower solvation dynamics in PVP−SDS aggregate compared to PVP alone or SDS alone indicates seriousrestrictions on the mobility of the water molecule squeezed between polymer chains and micellar (SDS)surface.
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