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Hydrogels of Superlong Helices to Synthesize Hybrid Ag-Helical Nanomaterials
- Li, Guihua, Wang, Yitong, Wang, Ling, Song, Aixin, Hao, Jingcheng
- Langmuir 2016 v.32 no.46 pp. 12100-12109
- Fourier transform infrared spectroscopy, circular dichroism spectroscopy, deoxycholic acid, gelation, glutathione, hydrogels, ions, nanofibers, nanosilver, silver, silver nitrate, strength (mechanics)
- The gelation behavior of mixtures of sodium deoxycholate (NaDC) and glutathione (GSH) in water is investigated. The system exhibits a structural transition of self-assembled hydrogels from nanofibers to nanohelix structures, and then to helical ribbons with increasing GSH concentration. Superlong helical nanofibers with left- and right-handed orientations are produced by tuning the concentration of GSH at a fixed concentration of NaDC. Random coil and β-sheet structures are significant for the formation of the helical structures, and are indicated by circular dichroism (CD) and Fourier transform infrared (FT-IR) spectra. The mechanical strength of the “weak” hydrogels is enhanced by the introduction of appropriate suitable amount of AgNO₃. Furthermore, the controlled growth of Ag nanoparticles at spatially arranged locations along the nanohelices (hybrid Ag-helical nanomaterial) is readily achieved by UV reduction of Ag (I) ions on the supramolecular helical templates.