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Fractional ionization of cetyltrimethylammonium hydroxide micelles determined by dynamic light scattering

✍ Scribed by V. Athanassakis; J.R. Moffatt; C.A. Bunton; R.B. Dorshow; G. Savelli; D.F. Nicoli

Publisher
Elsevier Science
Year
1985
Tongue
English
Weight
541 KB
Volume
115
Category
Article
ISSN
0009-2614

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✦ Synopsis

Using the method of dynamic light scattering we have measured the diffusion coefficients D of cetyltrimethykmmonium hydroxide (CTAOH) micelles as a function of CTAOH and NaOH coxentrations at 25Β°C for 0.01 < [CTAOH] < 0.05 M and 0.02 d @IaOH] < 0.5 M. Substantial enhancements in the diffusivity were observed at low [NaO?kIl due to the presence of strong intermicekr electrostatic repulsions. We obtained good theoretical fits to the D versus [mAOH]. maOH] data over the range 0.01~ [NaOH] 4 05 M using linear interaction theory (including both thermodynamic and hydrodynamic corrections to D) with a DLVO-type pair interaction potential From these fits we obtained estimates of the mean micellar hydrodmc radius, R h = 23.4 & and the micellar ~'i-actional ionization, (I = 0.5.

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