Models of structure factors using hard sphere repulsive potential, short range attractive square-well potential and 2Youkawa potential are available. Further models are currently under construction.
References:
Narayanan, T., Synchrotron small-angle X-ray scattering studies of colloidal suspensions, Lecture Notes in Physics, (Non-crystalline diffraction) Ed. T. Ezquerra, 776, p 133-156 (Springer, Berlin-Heidelberg, 2009)