Swelling of a granular hydrogel medium under confinement: individual and collective dynamic Lucía Cristófaro, Sebastián Falcioni, Leonardo Binda, Yanina Lucrecia Roht, Germán Drazer and Irene Ippolito EPJ Web Conf., 249 (2021) 05005 Published online: 07 June 2021 DOI: 10.1051/epjconf/202124905005