Table 1.

Compositions of the hydrogels used in the experiments.

	Monomers			Crosslinker	Initiator
Hydrogel	Acrylic Acid (g)	Acrylamide (g)	Sodium hydroxide (g)	MBA (g)	Ammonium Persulfate (g)	Distilled Water (g)
H-1	9	1	1.215	0.025	0.064	50
H-2	5	5	0.675	0.025	0.064	50
H-3	1	9	0.135	0.025	0.064	50