**5.3 Nanoscience and nanotechnology**

Li et al. developed the nanoparticles with a combination of silver and gemini imidazoline surfactants. The silver (Ag) nanoparticles well dispersed in nature

were taken for the synthesis with novel imidazoline Gemini surfactant quaternary ammonium salt of di (2-heptadecyl-1-formyl aminoethyl imidazoline) hexane diamine at room temperature. Characterization of Ag nanoparticles was done by X-ray diffraction, Transmission electron microscopy, Fourier transform infrared, and UV- absorption spectra. The result revealed the enhanced micellized aggregation of gemini imidazoline surfactant in water as well as the Ag particles and the coordination and adsorption phenomena between the Ag nanoparticles and the imidazoline surfactant. It can act as environmentally friendly nanoparticles due to the modification in the surface of synthesized Ag nanoparticles. The developed Ag nano product act as a metal catalyst for methyl orange reduction reaction because of the active adsorption between methyl orange particles and Ag nanoparticles [46].
