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Greener Biomimetic Approach to the Synthesis of Nanomaterials using Antioxidants and their Sustainable Applications
Citation:
VARMA, R. S. Greener Biomimetic Approach to the Synthesis of Nanomaterials using Antioxidants and their Sustainable Applications . Presented at Invited presentation at the 10th Indo-Italian Workshop on Chemistry and Biology of Antioxidants, Rome, ITALY, November 10 - 12, 2011.
Impact/Purpose:
To inform the EPA
Description:
The presentation summarizes our sustainable synthetic activity for the preparation of nanoparticles involving benign alternatives which reduces or eliminates the use and generation of hazardous substances. Vitamins B1, B2, C, and tea and wine polyphenols which function both as reducing and capping agents, provide extremely simple, one-pot, green synthetic methods to bulk quantities of nanospheres, nanorods, nanowires, and nanoballs of aligned nanobelts and nanoplates of the metals in water without the need for large amounts of insoluble templates. A bulk and shape-controlled synthesis of noble nanostructures with various shapes such as prisms, cubes, and hexagons occurs via microwave (MW)-assisted spontaneous reduction of noble metal salts using aqueous solution of a-D-glucose, sucrose, and maltose. A general method has been developed for the cross-linking reaction of poly (vinyl alcohol) (PVA) with metallic systems such as Pt, Cu, and In; bimetallic systems, namely Pt-In, Ag-Pt, Pt-Fe, Cu-Pd, Pt-Pd and Pd-Fe, and single-wall carbon nanotubes (SWNT), multi-wall carbon nanotubes (MWNT), and Buckminsterfullerene (C-60). The strategy is extended to the formation of biodegradable carboxymethylcellulose (CMC) composite films with noble nanometals; such metal decoration and alignment of carbon nanotubes in CMC is possible using MW approach which also enables the shape-controlled bulk synthesis of Ag and Fe nanorods in poly (ethylene glycol). A cleaner approach to formation of tantalum oxide nanoparticles is ptimized.