Fig. 3
The self-assemble mechanism of the rhein hydrogel. a UV/Vis spectrum of the rhein hydrogel. b Fluorescence emission spectra of rhein solution and hydrogel. The samples were recorded at 4 mg mL−1 (14.1 mM). c XRD pattern of the rhein xerogel (the unit of inserted distances is Å). d CD spectra of the rhein hydrogel at different concentrations. e Self-assembly process diagram of the rhein hydrogel
