Synthesis of Ni/Y2O3 nanocomposite through USP and lyophilisation for possible use as coatingŠvarc, Tilen (Avtor) Stopić, Srečko (Avtor) Jelen, Žiga (Avtor) Zadravec, Matej (Avtor) Friedrich, Bernd (Avtor) Rudolf, Rebeka (Avtor) Ultrasonic Spray Pyrolysis (USP)lyophilisationNi/Y2O3 nanocompositecharacterisationcoatingsThe Ni/Y2O3 catalyst showed high catalytic activity. Based on this, the aim of this study was to create Ni/Y2O3 nanocomposites powder with two innovative technologies, Ultrasonic Spray Pyrolysis (USP) and lyophilisation. In the USP process, thermal decomposition of the generated aerosols in an N2/H2 reduction atmosphere caused a complete decomposition of the nickel (II) nitrate to elemental Ni, which became trapped on the formed Y2O3 nanoparticles. The Ni/Y2O3 nanocomposite particles were captured via gas washing in an aqueous solution of polyvinylpyrrolidone (PVP) in collection bottles. PVP was chosen for its ability to stabilise nano-suspensions and as an effective cryoprotectant. Consequently, there was no loss or agglomeration of Ni/Y2O3 nanocomposite material during the lyophilisation process. The Ni/Y2O3 nanocomposite powder was analysed using ICP-MS, SEM-EDX, and XPS, which showed the impact of different precursor concentrations on the final Ni/Y2O3 nanocomposite particle composition. In a final step, highly concentrated Ni/Y2O3 nanocomposite ink (Ni/Y2O3 > 0.140 g/mL) and test coatings from this ink were prepared by applying them on a white matte photo paper sheet. The reflection curve of the prepared Ni/Y2O3 nanocomposite coating showed a local maximum at 440 nm with a value of 39% reflection. Given that Ni is located on the surface of the Ni/Y2O3 nanocomposite in the elemental state and according to the identified properties, tests of the catalytic properties of this coating will be performed in the future.MDPI20222025-03-20 13:37:53Članek v reviji92207UDK: 669.2/.8:620.3COBISS_ID: 104836099DOI: 10.3390/ma15082856ISSN pri članku: 1996-1944sl© 2022 by the authors