Naslov
Reduction of irradiation dose by changing irradiation atmosphere for crosslinking of nanocoatings on metals

Autori
Pezić, Ena ; Dubčević, Pavo ; Kralj, Damir ; Mihaljević, Branka ; Marušić, Katarina

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
32nd Miller Conference on Radiation Chemistry : Book of abstracts / - , 2023, 64-64

Skup
32nd Miller Conference on Radiation Chemistry

Mjesto i datum
Korzika, Francuska, 03.06.2023. - 08.06.2023

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
radiation crosslinking ; polymer coatings

Sažetak
Selfassembled monolayers (SAMs) are an important element of modern nanotechnology and surface functionalization. Recently, the application of SAMs for corrosion protection of various metals has been reported. Studies have shown that while SAMs exhibit significant short-term protective properties, their long-term protective properties are not significant because SAMs are removed from the metal surface when exposed to corrosive media. Crosslinking of SAMs improves both their short- term and long-term protective properties. It has been shown that SAMs from fatty acids on metals can be efficiently crosslinked by gamma irradiation in an inert air atmosphere. The doses required for crosslinking under these conditions are in excess of 100 kGy. The irradiation dose is one of the main factors determining the price of the commercial irradiation process. Therefore, the possibility of reducing the irradiation dose for a given crosslinking process is an important consideration that should be investigated. In this work, a SAM of elaidic acid, an unsaturated trans fatty acid with 18 carbon atoms, HOC–(CH₂–)₇CH=CH–(CH₂–)₈H and with the double bond in trans configuration, was applied to copper. The crosslinking of SAM was studied under different conditions, in air and in solvents. Figure 1 shows the studied SAM and the nanocoating crosslinked by gamma irradiation. The protective properties of the coatings were studied by electrochemical methods (polarisation measurements and electrochemical impedance spectroscopy) under simulated atmospheric conditions (0.2 g/L Na2SO4 + 0.2 g/L NaHCO3 + 0.2 g/L NaNO3 at pH 5). The hydrophobicity of the coatings was investigated by contact angle measurements, while the surface morphology was studied by atomic force microscopy. The results showed that it is possible to obtain similar protective properties when the SAM is crosslinked in an inert air atmosphere and in inert water media. Acknowledgements: We thank the Croatian Science Foundation (HRZZ IP-2020-02-4344) for supporting this research.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Kemijsko inženjerstvo

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