Table 1. Composition of the hydrogel and manufacturing conditions.

	sample codes
compositions	N–P0	N–P1	N–P2	N–P3
NIPAAm (μL)	400	340	260	200
BIS (mg)	0.64	0.64	0.64	0.64
PVA (μL)	0	60	140	200
APS (μL)	5	5	5	5
TEMED (μL)	6	6	6	6