Fig. 2

Porosity characteristics of PADM and Lev@PADM hydrogels. A Photographs of the hydrogels were captured at different magnifications of SEM (5000 ×, 10,000 ×, and 15,000 ×). Porosity images were computed at 10,000 × using Image J software. B The porosity of PADM hydrogel and Lev@PADM hydrogel was assessed. C Infrared spectral distribution of PADM hydrogel and Lev@PADM hydrogel under Fourier infrared spectroscopy