Fig. 4

Hydrodynamic size distribution, the zeta potential of synthesized P(NIPAAm-co-DMAEMA) hydrogels in different conditions. a Size distribution of hydrogel in distilled water and room temperature. b Size distribution of dual drug-loaded hydrogels in distilled water and room temperature. Size distribution, the zeta potential of hydrogel (c, c') in pH 5.8, 37 °C. d, d' in pH 7.4, 37 °C. The size distribution of hydrogel (e) in pH 7.4, 40 °C. f in pH 5.8, 40 °C