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- W2035416596 abstract "Abstract The kinetics and equilibrium of fading of triphenylmethane dyes were determined spectroscopically in 0.01 M N -dodecyl-β-alanine (NDA), 1% Brij 35 (Brij), and 0.01 M sodium dodecyl sulfate (SDS) solutions. As the pH increased, the dissociation constant, K , of the dye remained unchanged in Brij solutions but decreased in NDA solutions. This variation in the p K values with pH for NDA was quantitatively explicable on the basis of the surface potential of the micelle which had already been determined potentiometrically. Moreover, it was suggested that almost all the dye molecules in surfactant solutions are solubilized on micelles and that the micellar surface has the nature of a mixture of water and organic solvent. The rate constant, k , of alkaline fading of the dye on Brij and SDS micelles could be expressed by the equation k = k 0 + k 1 [OH − ] b , where [OH − ] b denotes the hydroxide ion concentration in bulk solutions. On the other hand, the rate constant of the dye on NDA micelles had a maximum at a given pH, as is usually seen in enzymatic catalysis. The pH-rate profile for NDA was explicable on the basis of a concerted catalysis model rather than an electrostatic catalysis model. That is, k = k 0 + k 3 β (1 - β ) + k 2 [OH − ] s . Here, a k 3 term and a k 2 term represent a contribution of concerted catalysis by the anion and the zwitterion of NDA molecules in micelles and a contribution of catalysis by the hydroxide ion at the micellar surface, respectively." @default.
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- W2035416596 title "The kinetics and equilibrium of alkaline fading of triphenylmethane dyes at the micellar surface of N-dodecyl-β-alanine" @default.
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- W2035416596 doi "https://doi.org/10.1016/0021-9797(77)90127-8" @default.
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