Fast and Eco–friendly Microwave‐Assisted Synthesis of Silver Nanoparticles using Rosemary Essential Oil as Renewable Reducing Agent.

Abstract

A green and fast methodology was developed to synthesize silver nanoparticles using rosemary essential oil (EO) as a renewable reducing agent. The synthesis process was microwave (MW) assisted, using a coaxial dipole antenna immersed into the reaction medium. This configuration was used to promote both: i) rosemary EO extraction by hydrodistillation, and ii) silver nanoparticle synthesis in an aqueous solution at atmospheric pressure. The effect of two different silver salt substrates and the time reaction on the morphology of the silver nanoparticles was explored. The coaxial microwave‐assisted hydrodistillation of rosemary yields 0.4 % (w/w) in 30 min and contains ethers (17 %), ketones (50 %) and alcohols (15 %). Silver nanoparticles with a tuneable particle size (from 7 to 18 nm) and morphology (from spherical to round‐like shapes) were obtained in reaction times ranging from 2 to 30 min. The nanoparticle formation was followed by UV‐vis spectroscopy and SEM imaging.

Green Synthesis of Metal and Metal Oxide Nanoparticles Using Different Plants’ Parts for Antimicrobial Activity and Anticancer Activity: A Review Article

“…It was reported that two important terpenoids, e.g., sesquiterpenoids and monoterpenoids, are basic constituents for the silver nanoparticles' synthesis [71]. Various reports showed the importance of essential oil of different plants' species in the synthesis of silver nanoparticles such as Cocos nucifera [72], rosemary [73], Ricinus communis [74], and Anacardium occidentale [75].…”

Direct synthesis of lemongrass (Cymbopogon citratus L.) essential oil-silver nanoparticles (EO-AgNPs) as biopesticides and application for lichen inhibition on stones

“…Silver exhibits higher toxicity to various microorganisms because its attachment to the cell membrane surface significantly impairs proper functions such as respiration and permeability. Several research have used Ag metal as a precursor in the manufacture of nanoparticles [ 13 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ]. In addition, the gold metal can also be used as a material for making nanoparticles [ 33 , 34 ].…”

Combining acid-based deep eutectic solvents and microwave irradiation for improved chestnut shell waste valorization

“…Microwave (MW) assisted chemical processes are nowadays a mature and well-established research field. Dielectric heating promoted by MW irradiation has been applied to various chemical processes such as reactions, 1 extractions, 2,3 materials synthesis [4][5][6] and biomass processing. 7 MW assisted heating significantly reduces processing time, energy consumption, costs, environmental impact and equipment size with respect to conventional heating methods.…”