Morphological Size of Asphaltene Micelles in Asphalt and Heavy Residue
Several techniques have been used to measure the morphological sizes of asphaltene micelles. Among these, the Guinier method for small angle x-ray scattering of both asphalt and heavy oils has been found to be especially useful. From radii of gyration determinations, the morphological diameters of asphaltene micelles are known to be ca. 10 nm. This can be supported by data from dynamic nuclear polarizations as well as from small angle neutron scattering work. Association and clustering of these basic micelles can be chemically or physically initiated by dipole-dipole interactions. The metal shadowing transmittance electron microscopy has been used to demonstrate these phenomena.
KeywordsDynamic Nuclear Polarization Small Angle Scattering Asphalt Sample Strategic Highway Research Program Asphaltene Particle
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