605610.fig.003a
(a)
605610.fig.003b
(b)
605610.fig.003c
(c)
Figure 3: Digital images corresponding to samples during swelling tests (after 180 minutes). (a) batch 11 (0.1 M NaCl), (b) batch 15 (0.01 M NaCl) and (c) batch 16 (without NaCl).