Small-angle neutron scattering (SANS) from cationic globular micellar solutions composed of sodium dodecyl sulfate (SDS) and in water was studied with contrast variation approach. Extensive computational studies have demonstrated that the distribution of invasive water is clearly an important feature for understanding the self-organization of SDS molecules and the stability of assemblies. However, in existing scattering studies the degree of hydration level was not examined explicitly. Here using the scheme of contrast variation, we establish a methodology of SANS to determine the intra-micellar radial dis-tributions of invasive water and SDS molecules from the evolving spectral lineshapes caused by the varying isotopic ratio of water. A detailed description hydration of SDS micelles is provided, which in an excellent agreement with known results of many existing simulations studies. Extension of our method can be used to provide an in-depth insight into the micellization phenomenon which is commonly found in many soft matter systems.
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