Abstract
The effect of KBr on the size, shape and microviscosity of CTAB micelles has been investigated by means of laser light scattering (LLS),1H NMR measurements and fluorescence probe. The data obtained from the various techniques are quantitatively in agreement. The Rh of micelles in 0.01 rnol · L−1 CTAB solution increases from 3.5 nm to 43 nm andR g increases to 89 nm with addition of KBr salt. In this process, both the microviscosity and molecular weight of micelles Mw have noticeable increases, too. The rod-like micelles are formed at 0.1 rnol · L1 KBr and the worm-like micelles are formed at above 0.2 rnol · L-1 KBr.
Similar content being viewed by others
References
Ikeda, S., Fujio, K., The salt-induced sphere-rod transition of dodecypyridinium idide in aqueous Nal solutions, Colloid Polym. Sci., 1992, 270(10): 1009.
Malliaris, A., Lang, J., Zana, R., Micellar aggregation numbers at high surfactant concentration, J. Colloid Interface Sci., 1986, 110(1): 237.
Porte, G., Appell, J., Poggi, Y., Experimental investigations on the flexibility of elongated cetylpyridinium bromide micelles, J. Phys. Chem., 1980, 84(23): 3105.
Appell, J., Porte, G., An investigation on the micellar shape using angular dissymmetry of light scattered by solutions of cetylpyridium bromide, J. Colloid Interface Sci., 1981, 81(1): 85.
Appell, J., Porte, G., Poggi, Y., Quantitative estimate of the orientational persistence length of flexible elongated micelles cetylpyridium bromide, J. Colloid Interface Sci., 1982, 87(2): 492.
Cates, M. E., Candau, S. J., Statics and dynamics of worm-like surfactant micelles, J. Phys.: Condens. Matter 2, 1990: 6869.
Clausen, T. M., Vinson, P. K., Minter, J. R. et al., Viscoelastic micellar solutions: microscopy and rheology, J. Phys. Chem., 1992, 96(1): 474.
Li, M., Zhang, Y., Jiang, M. et al., Studies on novel surfactant-free polystyrene nanoparticles formed in microphase inversion, Macromolecules, 1998, 3l(20): 6841.
Li, M., Jiang, M., Zhu, L. et al., Novel surfactant-free stable colloidal nanoparticles made of randomly carboxylated polystyrene ionomers, Macromolecules, 1997, 30(7): 2201.
Soltero, J. F. A., Puig, J. E., Manero, O. et al., Rheology of cetyltrimethylammonium tosilate-water system, 1: Relation to phase behavior, Langmuir, 1995, 11(9): 3337.
Zana, R., Yiv, S., Strazielle, C. et al., Effect of alcohol on the properties of micellar systems, 1: Critical micellization concentration, micellar molecular weight and ionization degree, and solubility of alcohols in micellar solutions, J. Colloid Interface Sci., 1981, 80(1): 208.
Thomas, J. K., Radiation-induced reactions in organized assembles, Chemical Reviews, 1980, 80(4): 283.
Israelachvili, J. N., Michell, D. J., Ninham, B. W., Theory of assembly of hydrocarbon amphiphiles into micelles, J. Chem. Soc., Faraday Trans. 2, 1976, 72(4): 1525.
Author information
Authors and Affiliations
Corresponding author
About this article
Cite this article
Zhang, W., Li, G., Mu, J. et al. Effect of KBr on the micellar properties of CTAB. Chin.Sci.Bull. 45, 1854–1857 (2000). https://doi.org/10.1007/BF02886293
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02886293