We investigate the swelling dynamics driven by solvent absorption in a hydrogel sphere immersed in a solvent bath, through a computational model and a numerical study. We extensively describe the transient process from dry to wet and discuss the onset of surface instabilities through a measure of the lack of smoothness of the outer surface and a morphological pattern of that surface with respect to the two material paremeters driving the swelling dynamics.
Curatolo, M., Nardinocchi, P., Puntel, E., Teresi, L. (2017). Transient instabilities in the swelling dynamics of a hydrogel sphere. JOURNAL OF APPLIED PHYSICS, 122(14), 145109 [10.1063/1.5007229].