TGA analysis of the calcination process and porosity estimation


e is the porosity,
wl and ws are the corresponding weights of latex and silica in the sample,
rl and rs are their densities assumed to 1.05 g/cm3 for the polystyrene latex and 2.20 g/cm3 for the fused silica.


Substituting the above TGA values, an estimated porosity of 78 vol% is obtained. This value is close to that expected for a material with close-packed ordered spherical pores (» 74%).



    © Copyright O. D. Velev 1998


   Index    Previous    Next Console    Console