Abstract
The adsorption behavior ofN-dodecyl-N,N dimethyl aminobetaine chlorohydrate (DDAB·HCl) at the air/aqueous interface was studied for solutions in pure water and phosphate buffer (pH=7.4). The equilibrium surface tension versus concentration curves were used to estimate the equilibrium adsorption parameters and CMCs. The buffer solution has a lower CMC and shows higher surface activity below the CMC than the pure water solution. Data and calculations of the dynamic tension behavior at constant-area conditions showed that the adsorption processes of DDAB·HCl solutions are about 10 to 300 times slower than those predicted by a diffusion-controlled model. A mixed kinetics adsorption model with a modified Langmuir-Hinshelwood kinetic equation, which considers an activation energy barrier for adsorption, was applied to find the kinetic adsorption parameters. The dynamic tension behavior at pulsating-area conditions with large amplitude was also examined for frequencies up to 90 cycles/min. The tension amplitude responses depended strongly on the concentration and frequency. Comparisons of diffusion-controlled model predictions and pulsating area tension data confirmed the need to use a mixed kinetics model. The latter model can improve the fit over the diffusion-controlled model, but it does not quantitatively match the observed tensions.
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Abbreviations
- B :
-
empirical parameter in Eq. (3)
- c :
-
concentration
- D :
-
diffusivity
- k aL :
-
adsorption rate constant
- k dL :
-
desorption rate constant
- K L :
-
adsorption equilibrium constant
- n :
-
factor accounting for the dissociation of counter-ions, Eq. (1).
- R :
-
gas constant
- t :
-
time
- T :
-
temperature
- γ:
-
surface tension
- γ0 :
-
surface tension of pure solvent (water)
- γmin :
-
minimum surface tension
- Δγ :
-
difference between maximum and minimum surface tensions
- Γ:
-
surface concentration
- Γe :
-
equilibrium surface concentration (subscript is dropped in Eq. (1))
- Γm :
-
maximum surface concentration
References
Ernst R, Miller EJ Jr (1982) In: Bluestein BR, Hilton CL (eds) Amphoteric surfactants. Marcel Dekker, New York, pp 71–173
Idson B (1983) In: Rieger MM (ed) Surfactants in cosmetics: Marcel Dekker, New York, pp 1–28
Holzman S, Avram N (1986) Tenside Detergents 23:309–313
Wüstneck R, Kriwanek J, Herbst M, Wasow G, Haage K (1992) Colloids Surfaces 66:1–9
Hua XY, Rosen MJ (1988) J Colloid Interface Sci 124:652–659
Datyner A (1983) Surfactants in Textile Processing, Marcel Dekker, New York
Riva A, Cegarra J (1989) J Soc Dyers Colourists 105:399–405
Chang CH, Wang NHL, Franses EI (1992) Colloids Surfaces 62:321–332
Chang CH, Franses EI (1992) Colloids Surfaces 69:189–201
Chang CH, Franses EI (1993) Chem Eng Sci, in press
Rosen MJ, Zhao F, Murray S (1987) J Am Oil Chem Soc 64:439–331
Bregoff HM, Roberts E, Delwiche CC (1953) J Biol Chem 205:565–574
Lunkenheimer K, Miller R (1987) J Colloid Interface Sci 120:176–183
Lioussayre F, de Savignac A, Rico I, Hajjaji-Shriri N, Lattes A (1987) J Dispersion Sci Technology 8:181–197
Enhorning G (1977) J Appl Physiol: Respirat Environ Excercise Physiol 43:198–203
Rosen MJ (1989) Surfactants and Interfacial Phenomena. 2nd Edition. Wiley, New York
Steiner EC, Blau GE, Agin GL (1986) Introductory Guide: Simusolv Modeling and Simulation Software. The Dow Chemical Co., Midland, Michigan
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Pinazo, A., Chang, C.H. & Franses, E.I. Dynamic surface tension behavior of aqueous solutions ofN-dodecyl-N,N dimethyl aminobetaine chlorohydrate. Colloid Polym Sci 272, 447–455 (1994). https://doi.org/10.1007/BF00659458
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DOI: https://doi.org/10.1007/BF00659458