Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 336, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.molliq.2021.116319
Keywords
Nanofluid; Magnetron sputtering; Gas aggregation cluster source; Copper nanoparticles; Polyethylene glycol
Funding
- Czech Science Foundation [GACR 21-12828S]
- Charles University [SVV 260 579-2021]
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Colloidal solutions of metal nanoparticles are usually produced using multi-step methods with various chemicals, but a single-step method proposed in this study only requires Cu NPs and polyethylene glycol, showing enhanced stability and optical performance.
Colloidal solutions of metal nanoparticles (NPs) are typically produced by multi-step methods using a variety of chemicals. Resultant nanofluids require extra purification steps to remove the reactions byproducts and modification steps to introduce anticoagulants for the solution stabilization. Here, we suggest a single-step method to produce nanofluid in which only two components are present: 22 nm-sized Cu NPs as a filler and polyethylene glycol (PEG, 400 g/mol) as a liquid base. The method employs magnetron sputtering to synthesize Cu NPs in a gas aggregation cluster source and their subsequent loading into vacuum-compatible PEG. The resultant nanofluid demonstrates strong plasmonic and photoluminescent activity, and shows enhanced stability over time, in contrast to conventional colloidal solutions. The approach offers an alternative for the production of nanofluids in which the processes of the NP formation are decoupled from the processes of their mixing with the liquid base. (C) 2021 Elsevier B.V. All rights reserved.
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