Archive for March, 2011


March 8, 2011

Nanoparticles using Moringa?

My first thought was you have got to be kidding. In the past couple of years we at Trees for Life have seen Moringa research covering everything from diabetis to ulcers, animal feed to water purification; and food supplements for lactating mothers to cancer recovery.  But in nano technology?  – read on.

Biosynthesis of Silver Nanoparticles Using Moringa oleifera Leaf Extract and Its Application to Optical Limiting

Authors: Sathyavathi, R.; Krishna, M. Bala Murali; Rao, D. Narayana

Source: Journal of Nanoscience and Nanotechnology, Volume 11, Number 3, March 2011 , pp. 2031-2035(5)


The Development of biologically inspired experimental processes for the synthesis of nanoparticles is evolving into an important branch of nanotechnology. The work presented here with the biosynthesis of silver nanoparticles using Moringa oleifera leaf extract as reducing and stabilizing agent and its application in nonlinear optics. The aqueous silver ions when exposed toMoringa oleifera leaf extract are reduced resulting in silver nanoparticles demonstrating the biosynthesis. The silver nanoparticles were characterized by UV-Visible, X-ray diffraction (XRD), Fourier transform infra-red spectroscopy (FT-IR) and transmission electron microscopy (TEM) techniques. TEM analysis shows a dispersion of the nanoparticles in a range of 5-80 nm with the average around 46 nm and are crystallized in face centred cubic symmetry. To show that these biosynthesized silver nanoparticles possess very good nonlinear properties similar to those nanoparticles synthesized by chemical route, we carried out the Z-scan studies with a 6 ns, 532 nm pulsed laser. We estimated the nonlinear absorption coefficient and compare it with the literature values of the nanoparticles synthesized through chemical route. The silver nanoparticles suspended in solution exhibited reverse saturable absorption with optical limiting threshold of 100 mJ/cm2.

I guess that there always has to be a first before there can be a second but who would have guessed that, Moringa could be an agent in Nano technology research?