2.4. Characterization of freeze-casted tablets
A digital microscopic system (VH-Z100, Keyence) was used to
record the overview of morphology of the pores and tablets. The
structures of freeze-casted bodies were studied by using a scanning
electron microscope (Philips XL 30 ESEM). To get better SEM
images, samples for scanning microscopy examination were
mounted and coated with platinum in a sputter coater before
SEM measurement