Abstract
Small-angle X-ray scattering (SAXS) and dynamic light scattering (DLS) techniques have been used to study the structural properties of nonionic surfactant dodecyl-poly(ethylene oxide-23) ether (C12E23, commercial name Brij 35) in water and in various alcohols from ethanol to 1-decanol. All measurements were performed at 25 °C. SAXS experimental data were put on absolute scale using water as a secondary standard and evaluated using the generalized indirect Fourier transformation method (GIFT), which is based on the simultaneous determination of the intra- and interparticle scattering contributions. In this way, the size and shape of interacting scattering particles in real space could be deduced. In the Brij 35/water binary system (surfactant concentrations from 0.5 to 25 mass %) globular micelles with maximum dimensions ranging from 9 to 10.5 nm and radii of the hydrophobic core around 1.7 nm were found. At low surfactant concentrations the micelles were more or less spherical, whereas slight elongation o...
Published Version
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