| Nano-silver particles were prepared with Chinese and Indian momordica charantia extracts as the reducing agent and silver nitrate as the precursor. Their properties were characterized by UV-Vis, FTIR, XRD and TEM. When the concentration of silver nitrate is 10 mmol/L, the prepared spherical nano-silver particles have the smallest average particle size of 7.46 and 8.72 nm for the two types of reducing agents, respectively. Flavonoids, proteins and other tricholasts in the momordica charantia extracts were used as reducing agents and protective agents during the reaction process. The reaction mechanism was that flavonoids were reduced by losing H+ from anoleol structure to a pyridine-type structure to reduce Ag+. The type of momordica charantia extracts has little effect on size, morphology, dispersion and uniformity of nano-silver particles. |
