Yes, the pores are assumed to be spherical in the fitting of SAXS data, because the spherical model is the simplest and widely used model in the SAXS fitting. The voids are cylindrical that is close to a spherical, so we can get a relatively accurate size distribution by assuming to spherical.
“During the thermal treatment, the nano-scale pores increase obviously, which will seriously increase the sensitivity of CL-20, and make a dangerous to the explosive charges with CL-20.