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- Title
Fibrillar Networks of Glycyrrhizic Acid for Hybrid Nanomaterials with Catalytic Features.
- Authors
Saha, Abhijit; Adamcik, Jozef; Bolisetty, Sreenath; Handschin, Stephan; Mezzenga, Raffaele
- Abstract
Self-assembly of the naturally occurring sweetening agent, glycyrrhizic acid (GA) in water is studied by small-angle X-ray scattering and microscopic techniques. Statistical analysis on atomic force microscopy images reveals the formation of ultralong GA fibrils with uniform thickness of 2.5 nm and right-handed twist with a pitch of 9 nm, independently of GA concentration. Transparent nematic GA hydrogels are exploited to create functional hybrid materials. Two-fold and three-fold hybrids are developed by introducing graphene oxide (GO) and in situ-synthesized gold nanoparticles (Au NPs) in the hydrogel matrix for catalysis applications. In the presence of GO, the catalytic efficiency of Au NPs in the reduction of p-nitrophenol to p-aminophenol is enhanced by 2.5 times. Gold microplate single crystals are further synthesized in the GA hydrogel, expanding the scope of these hybrids and demonstrating their versatility in materials design.
- Subjects
GLYCYRRHIZA; HYDROGELS; NANOCOMPOSITE materials spectra; CATALYTIC activity; SMALL-angle X-ray scattering; GRAPHENE oxide; GOLD nanoparticles; NITROPHENOLS
- Publication
Angewandte Chemie, 2015, Vol 127, Issue 18, p5498
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201411875