Fig. 2: Thermally triggered self-assembly and gelation. | Nature Communications

Fig. 2: Thermally triggered self-assembly and gelation.

From: Programmable supramolecular chirality in non-equilibrium systems affording a multistate chiroptical switch

Fig. 2

a Chemical structures of G, PBB, and their reversible reaction under pH stimuli. b Optical images of G and PBB mixtures at their CGCs in aqueous K+. c Cryo-SEM image of G-PBB-pHaq.1 hydrogel. d Cryo-TEM image of G-PBB-pHaq.13 hydrogel. e, f SAXS analysis of the hydrogels. g, k Temperature-dependent CD spectra of G-PBB hydrogels at 1 °C intervals. h, l Temperature-dependent degree of aggregation, α, calculated from the CD signals at 300 and 305 nm in graphs (g) and (k), respectively. Lines are the corresponding isodesmic fit (red solid line) and cooperative fit (blue dashed line). i, m elongation equilibrium constant, Ke, as a function of temperature. j, n Van’t Hoff plot. Graphs (g–j) are for G-PBB-pHaq.12 hydrogel and graphs (k–n) are for G-PBB-pHaq.3 hydrogel. In all graphs, hydrogels were prepared at their CGCs and molar ratio of G:PBB = 2:1.

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