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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F23%3A00576111" target="_blank" >RIV/61389013:_____/23:00576111 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11320/23:10458062 RIV/CZ______:_____/23:N0000040

Result on the web

<a href="https://pubs.rsc.org/en/content/articlelanding/2023/NA/D2NA00785A" target="_blank" >https://pubs.rsc.org/en/content/articlelanding/2023/NA/D2NA00785A</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/D2NA00785A" target="_blank" >10.1039/D2NA00785A</a>

Result language

angličtina

Original language name

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

Original language description

Since 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.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10404 - Polymer science

Project

<a href="/en/project/GA21-12828S" target="_blank" >GA21-12828S: Plasma-assisted synthesis of liquid polymer-based nanofluids</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Nanoscale Advances

ISSN

2516-0230

e-ISSN

2516-0230

Volume of the periodical

5

Issue of the periodical within the volume

3

Country of publishing house

GB - UNITED KINGDOM

Number of pages

15

Pages from-to

955-969

UT code for WoS article

000916535600001

EID of the result in the Scopus database

2-s2.0-85146888335