Green synthesis of metal nanoparticles using Deep Eutectic Solvents (DESs) Emma Smith , Joseph Eyre, John Hunt, Samantha Mclean School of Science and Technology, Nottingham Trent University, Nottingham, NG11 8NS, UK An emerging area in the bottom-up synthesis of metal nanoparticles is the use of Deep Eutectic Solvents (DESs); to-date there are only a small number of journal articles on this application in the literature. DESs offer a unique opportunity to develop a greener synthesis method that produces discretely sized and much more stable metal nanoparticle solutions. 1 In the synthesis of metal nanoparticles DESs can be solvent, reducing and stabilizing agent. DESs are salts that are usually made by mixing a hydrogen bond donor (HBD) and a hydrogen bond acceptor (HBA). 2 DESs have been traditionally formed with choline chloride as the HBA, however, the presence of halide ions precludes this from being used in the production of silver nanoparticles. As a result, lesser researched DESs formed from HBAs such as betaine or other (more expensive) choline salts need to be explored. This talk will discuss the current research on metal nanoparticle synthesis in DESs and our development of a new greener method for bottom-up metal nanoparticle synthesis in these solvents, particularly the synthesis of silver nanoparticles using a simple heating and stirring method from non-chloride containing DESs such as those formed with a betaine HBA. There are a vast number of possible HBDs that can be mixed with betaine to form a DES and currently each new DES used requires the synthesis parameters (such as time, temperature, concentration and if necessary extraction process) to be optimised. References 1. L. Adhikari, N. E. Larm, N. Bhawawet, G. A. Baker ACS Sustainable Chem. Eng ., 2018, 6 , 5725-5731; L. Das, L. D. Koonathan, A. Kunwar, S. Neogy, A. K. Debnath, S. Adhikari Mater. Adv . 2021, 2 , 4304; E.L Smith, A. P. Abbott, K. S. Ryder, Chem. Rev. , 2014, 21 , 11060-11082
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