Abstract
Nanopowders of Centella asiatica was produced using planetary ball mill by varying milling parameters such as milling time, mass concentration, and bead amount. Particle size analysis employing photon correlation spectroscopy was carried out to record the effect of milling parameters on the particle size produced. The morphology of milled powders was also analyzed using a field emission scanning electron microscope. The bioactive component, asiatic acid, was extracted from various sizes of C. asiatica powders, and its extraction yield at different powder size was calculated by high-performance liquid chromatography. Optimization of milling parameters was found to be a crucial step in determining the content of asiatic acid extracted. In this study, the highest amount of asiatic acid extracted was 25.4 mg/g, obtained at moderate conditions of the following milling parameters: 4 h of milling time, 1.2% (w/v) concentration of powder, and 25 g of bead load.
Highlights
Energy and creating new sources of energy has turned into a debatable issue. As we know, the largest source of energy is derived from fossil fuel
Today, energy and creating new sources of energy has turned into a debatable issue
This decrease is evident from 3 to 5% of nano-copper and reached 1200 while the electrical resistance of the composite of epoxy/graphite was determined to be 7400. This result shows that the addition of nano-copper to the composite of epoxy/graphite may enhance the electrical conductivity of this composite
Summary
Energy and creating new sources of energy has turned into a debatable issue. As we know, the largest source of energy is derived from fossil fuel. Keywords Bipolar plate · Nanocomposite · Fuel cell · Nano-copper · Graphite Nanocomposite conducting plates (CPs) are widely used alternative materials for bipolar plates in proton-exchange membrane fuel cells (PEMFCs) due to good corrosion resistance, good electrical and thermal conductivity, low cost, easy fabrication, and suitable weight instead of metal and graphite alone.
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