Abstract
In an earlier work, we had studied small-angle neutron scattering (SANS) from micellar solutions of bis-cationic C 16H 33N +(CH 3) 2–(CH 2) m –N +(CH 3) 2C 16H 33, 2Br − gemini surfactants, referred to as 16- m-16, 2Br −, for several spacer lengths. This Letter reports the results of small-angle X-ray scattering (SAXS) experiments on the above system for spacer lengths of m=3, 4 and 12. It is seen that SAXS distributions are qualitatively different from the SANS distributions. These experiments show that a combined SANS and SAXS study can be used for obtaining information on the counterion distribution around the micelles.
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