Počet záznamů: 1  

Plasmonic Ag/Cu/PEG nanofluids prepared when solids meet liquids in the gas phase

  1. 1.
    SYSNO ASEP0576111
    Druh ASEPJ - Článek v odborném periodiku
    Zařazení RIVJ - Článek v odborném periodiku
    Poddruh JČlánek ve WOS
    NázevPlasmonic Ag/Cu/PEG nanofluids prepared when solids meet liquids in the gas phase
    Tvůrce(i) Biliak, K. (CZ)
    Nikitin, D. (CZ)
    Ali-Ogly, S. (CZ)
    Protsak, M. (CZ)
    Pleskunov, P. (CZ)
    Tosca, M. (CZ)
    Sergievskaya, A. (BE)
    Cornil, D. (BE)
    Cornil, J. (BE)
    Konstantinidis, S. (BE)
    Košutová, T. (CZ)
    Černochová, Zulfiya (UMCH-V) RID, ORCID
    Štěpánek, Petr (UMCH-V) RID, ORCID
    Hanuš, J. (CZ)
    Kousal, J. (CZ)
    Hanyková, L. (CZ)
    Krakovský, I. (CZ)
    Choukourov, A. (CZ)
    Zdroj.dok.Nanoscale Advances. - : Royal Society of Chemistry - ISSN 2516-0230
    Roč. 5, č. 3 (2023), s. 955-969
    Poč.str.15 s.
    Jazyk dok.eng - angličtina
    Země vyd.GB - Velká Británie
    Klíč. slovananoparticles ; plasmonic nanofluids ; sputtering
    Vědní obor RIVCD - Makromolekulární chemie
    Obor OECDPolymer science
    Způsob publikováníOpen access
    Institucionální podporaUMCH-V - RVO:61389013
    UT WOS000916535600001
    EID SCOPUS85146888335
    DOI10.1039/D2NA00785A
    AnotaceSince the time of Faraday's experiments, the optical response of plasmonic nanofluids has been tailored by the shape, size, concentration, and material of nanoparticles (NPs), or by mixing different types of NPs. To date, water-based liquids have been the most extensively investigated host media, while polymers, such as poly(ethylene glycol) (PEG), have frequently been added to introduce repulsive steric interactions and protect NPs from agglomeration. Here, we introduce an inverse system of non-aqueous nanofluids, in which Ag and Cu NPs are dispersed in PEG (400 g mol−1), with no solvents or chemicals involved. Our single-step approach comprises the synthesis of metal NPs in the gas phase using sputtering-based gas aggregation cluster sources, gas flow transport of NPs, and their deposition (optionally simultaneous) on the PEG surface. Using computational fluid dynamics simulations, we show that NPs diffuse into PEG at an average velocity of the diffusion front of the order of μm s−1, which is sufficient for efficient loading of the entire polymer bulk. We synthesize yellow Ag/PEG, green Cu/PEG, and blue Ag/Cu/PEG nanofluids, in which the color is given by the position of the plasmon resonance. NPs are prone to partial agglomeration and sedimentation, with a slower kinetics for Cu. Density functional theory calculations combined with UV-vis data and zeta-potential measurements prove that the surface oxidation to Cu2O and stronger electrostatic repulsion are responsible for the higher stability of Cu NPs. Adopting the De Gennes formalism, we estimate that PEG molecules adsorb on the NP surface in mushroom coordination, with the thickness of the adsorbed layer L < 1.4 nm, grafting density σ < 0.20, and the average distance between the grafted chains D > 0.8 nm. Such values provide sufficient steric barriers to retard, but not completely prevent, agglomeration. Overall, our approach offers an excellent platform for fundamental research on non-aqueous nanofluids, with metal–polymer and metal–metal interactions unperturbed by the presence of solvents or chemical residues.
    PracovištěÚstav makromolekulární chemie
    KontaktEva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358
    Rok sběru2024
    Elektronická adresahttps://pubs.rsc.org/en/content/articlelanding/2023/NA/D2NA00785A
Počet záznamů: 1  

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