Green synthesis of silver nanoparticles using a halide-free natural deep eutectic solvent to control growth Joseph Eyre , Emma Smith, John Hunt, Samantha Mclean School of Science and Technology, Nottingham Trent University, Nottingham, NG11 8NS, United Kingdom Using Natural Deep Eutectic Solvents (NADES) for nanoparticle synthesis is an emerging research field for the green synthesis of nanoparticles. Nanoparticles synthesized in NADES can be split into two main synthesis routes, chemical reduction by heating and stirring and electrochemical methods. 1,2 Using NADES instead of conventional aqueous methods allows for a greener synthesis that allows for a more reproducible synthesis to form nanoparticles at a consistent size. Previously silver nanoparticles have been synthesized using silver nitrate dissolved in a DES which was chemically reduced using a microwave reactor. This work looks at using a heating and stirring method to synthesize silver nanoparticles using a NADES which has not been used to synthesize nanoparticles in the current literature. These methods used Oleylamine (OAm) as an additive in the reaction which allowed for the extraction of the nanoparticles into toluene for analysis. 1,3 Here we report a novel approach to synthesizing silver nanoparticles by using a previously unused NADES, a conventional heating and stirring method was used alongside using a Betaine:Glycerol 1:3 NADES and OAm and altering reaction conditions such as volume of additive, temperature and time to determine the ideal conditions needed for synthesis of small (<20nm) discretely sized nanoparticles whose size can be tailored using reaction conditions. References 1. L. Adhikari, N. E. Larm and G. A. Baker, ACS Sustain Chem Eng , 2019, 7, 11036–11043. 2. L. Adhikari, N. E. Larm, N. Bhawawet and G. A. Baker, ACS Sustain Chem Eng , 2018, 6, 5725–5731. 3. A. T. S. C. Brandão, S. Rosoiu, R. Costa, O. A. Lazar, A. F. Silva, L. Anicai, C. M. Pereira and M. Enachescu, Journal of Materials Research and Technology , 2021, 15, 342–359.
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