Fig. 3: Core-shell structure of swelled basic seeds.
From: Controlled macroscopic shape evolution of self-growing polymeric materials
a Schematic illustration (left) of the formation of core-shell structure and the image (right) of a swelled sample with a translucent core (region I) and a transparent shell (region II). Scale bars: 3 mm. b FT-IR spectra of a seed and the different regions of a swelled sample. c Reactions of propagating species and hygroscopic properties of the species.
