Fig. 3 | Nature Communications

Fig. 3

From: Binder driven self-assembly of metal-organic cubes towards functional hydrogels

Fig. 3

Time dependent growth of MOC-G1 nanotubes and gel column-chromatographic separation of charged species. a, b, c, d FESEM images of MOC/aq. NH3 mixture taken at different time intervals during the process of gelation. a Scale bar = 50 μm. b Scale bar = 30 μm. c Scale bar = 1 μm and d scale bar = 2 μm. e Schematic showing time dependent change in morphology of MOC/aq. NH3 mixture from flakes (at 2 h) to elongated tapes (at 4 h) to partially formed nanotubes (at 6 h) to complete nanotubes (at 8 h). f Schematic showing column-chromatographic separation of the mixture of cationic and anionic dye molecules using MOC-G1 hydrogel nanotubes as stationary phase. g Change in the colour of gel-column with time indicating separation of SHG and NB from their mixture. h Comparison of absorption spectra of eluent indicating gradual separation of SHG from NB. With increasing time, more SHG molecules come out of the column which is evident from increase in absorbance of 530 nm band. After all the SHG has come out, the gel-column is transformed to powder by changing pH and washed with methanol to recover NB

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