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College Park, Maryland      June 6 - 10 , 2004

WP46: SANS method to study of mixture systems of surfactants SDS+TX-100 and CTAB+TX-100

A. Rajewska (Insititute of Atomic Energy,05-400 Swierk-Otwock, Poland; Joint Institute for Nuclear Research, LNP, 141980 Dubna, Moscow region, Russia), R. F. Bakeeva (Kazan State Technological University, Kazan, Russia)

The mixing of amphiphiles in water may lead to the formation of mixed micelles which often present new properties with respect to the pure component solutions [1, 2]. Two mixture systems of classic surfactants: SDS ( sodium dodecyl sulphate )+TX-100( Triton-X-100 )( anionic + non-ionic ) and CTAB+TX-100 ( cationic + non-ionic )in water solution were investigated for temperatures 30o, 50o, 70o for compositions 1:1, 2:1, 3:1 with the time-of-flight small-angle neutron scattering ( TOF SANS ) spectrometer (YuMO) of the IBR-2 on pulsed neutron source [3] at FLNP, JINR in Dubna ( Russia ). Measurements have covered Q range from 8x10-3 to 0.4 Å-1. The SANS measurements of aqueous solutions of nonionic / ionic surfactants have shown that the mixed micelles are formed. From the measured dependence of the scattered intensity on the scattering angle, we derived the aggregation number and the electric charge of the mixed micelle at various compositions and ionic strengths.

1. Clint J., J. Chem.Soc., Faraday Trans., 1 ,1327 ( 1975 ); Moroi Y., Akisada H., et al., J. Colloid. Interface Sci., 61, 233 ( 1977 );Corti M., Degiorgio V., et al., J. Phys. Chem., 86, 2533 ( 1982 ); Cantu L., Corti M., Degiorgio V., J. Phys.. Chem., 94, 793 ( 1990 )
2. Rathman J., Scamehorn J. F., J. Phys. Chem., 88, 580 ( 1984 ); Treiner C.,Amar Khoida A., et al., J. Colloid Interface Sci., 128, 416 ( 1989 )
3. Ostanievich Yu. M., Makromol. Chem. Macromol. Symp., 15, 91 (1988 )

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