2007_6_Nr6_EEMJ

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Mihai et al. /Environmental Engineering and Management Journal 6 (<strong>2007</strong>), 6, 505-509 Praestol 611 c = 0.01 and SLS c = 1.6 10 -3 complex solution 10 6 10 5 a. Praestol 611 c = 0.1 and SLS c = 1.6 10 -3 complex solution 10 4 10 4 10 3 10 2 10 1 τ = f(γ) η = f(γ) η, cP 10 3 10 2 10 1 10 0 10 -1 10 -2 1 10 100 1000 γ, s -1 a. Praestol 611 c = 0.01 and SLS c = 2.1 10 -3 complex solution 10 5 10 0 10 -1 1 10 100 1000 b. going return γ, s -1 Fig. 8. Rheograme of complex solution (Praestol 611 c = 0.01 % and SLS c = 1.6 10 -3 %) in coordonate τ = f(γ) (a) and η = f(γ) (b). 10 4 10 3 10 2 τ = f(γ) η = f(γ) Praestol 611 c = 0.1 and SLS c = 2.3 10 -3 complex solution 10 6 10 5 10 1 10 0 10 -1 10 -2 1 10 100 b. γ, s -1 Fig. 7. Rheograme of complex solution made with Praestol 611 c = 0.01 % Praestol 611 c = 0.1 and SLS c = 1.6 10 -3 complex solution 10 5 10 4 η, cP τ, N/m 2 10 4 10 3 10 2 10 1 10 0 1000 100 10 1 10 100 1000 a. going return γ, s -1 Praestol 611 c = 0.1 and SLS c = 2.3 10 -3 complex solution τ, N/m 2 10 3 10 2 going 10 1 return 10 0 1 10 100 1000 γ, s -1 1 0.1 going return γ, s -1 1 10 100 b. Fig. 9. Rheograme of complex solution (Praestol 611 c = 0.01% and SLS c = 2,3 10 -3 %) in coordonate τ = f(γ) (a) and η = f(γ) (b) 508
Polyelectrolyte – surfactant complexes The rheology of polyelectrolyte solutions are profoundly altered by the presence of surfactants. The addition of an oppositely charged surfactant lowers the viscosity of polyelectrolyte solutions. This is because flexible polyelectrolytes bind to the spherical surfactant micelles by wrapping around the exterior of the micelle. References Abuin E. B., Scaiano J. C., (1984), Exploratory study of the effect of polyelectrolyte surfactant aggregates on photochemical behavior, J. Amer. Chem. Soc., 106, 6274-6283. Bastardo L. A., (2005), Self assembly of Surfactants and Polyelectrolytes in Solutions at Interfaces, PhD.Thesis at the Royal Institute of Technology Stockholm. Colby R., (2000), Polyelectrolyte interactions with surfactants and proteins, XIIIth International Congress on Rheology, Cambridge, UK, 414-416. Goddard E. D., Ananthapadmanabhan K. P., (1993), Interaction of Surfactants with Polymers and Proteins, CRC Press, London. Konop A. J., (1997), Polyelectrolyte Collapse Induced by Aggregation of Oppositely Charged Surfactant, Masters Thesis, Pennsylvania State University. Konop A.J, Colby R. H., (1999), Role of condensed counterions in the thermodynamics of surfactant micelle formation with and without oppositely charged polyelectrolytes, Langmuir 15, 58-65. Vautrin C., (2006), Stabilité et Structure d’Agrégats Catanioniques, PhD.Thesis University Versailles Saint-Quentin-en-Yvelines, France. 509
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Page 3 and 4: Editor-in-Chief: Prof. Matei Macove
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