Fig. 1 (abstract P42).
From: Abstracts from the International Society for Therapeutic Ultrasound Conference 2017
Scanning electron microscopy of (a) gelatin, (b) polyacrylamide and (c) macroporous polyacrylamide. Zoomed in sections show closed pockets or pores for gelatin and PAA but, MPAA pore structure provides fluid a path to follow throughout the gel. Fluid can travel from the pore on the gel surface to the deeper pore behind (bottom right rectangular areas)