20.500.12556/RUL-153981 Influence of the ultrasound cavitation intensity on reduced graphene oxide functionalization Graphene is a valuable and useful nanomaterial due to its exceptionally high tensile strength, electrical conductivity and transparency, as well as the ability to tune its materials properties via functionalization. One of the most important features needed to integrate functionalized graphene into products via scalable processing is the effectiveness of graphene dispersion in aqueous and organic solvents. In this study, we aimed to achieve the functionalization of reduced graphene oxide (rGO) by sonication in a one-step process using polyvinyl alcohol (PVA) as a model molecule to be bound to the rGO surface. We investigated the influence of the sonication energy on the efficacy of rGO functionalization. The correlation between the performance of the high-intensity ultrasonic horn and the synthesis of the PVA functionalized rGO was thoroughly investigated by TGA coupled with MS, and IR, Raman, XPS, Laser diffraction, and SEM analysis. The results show that the most soluble PVA-functionalized rGO is achieved at 50% of the ultrasonic horn amplitude. Analysis of cavitation dynamics revealed that in the near vicinity of the horn it is most aggressive at the highest amplitude (60%). This causes rGO flakes to break into smaller domains, which negatively affects the functionalization process. On the other hand, the maximum of the pressure pulsations far away from the horn is reached at 40% amplitude, as the pressure oscillations are attenuated significantly in the 2-phase flow region at higher amplitudes. These observations corelate well with the measured degree of functionalization, where the optimum functionalized rGO dispersion is reached at 50% horn amplitude, and generally imply that cavitation intensity must be carefully adjusted to achieve optimal rGO functionalization. graphene oxide poly(vinyl alcohol) ultrasonication surface functionalization grafen oksid polivinil alkohol ultrasonikacija funkcionalizacija površine true false true Angleški jezik Slovenski jezik Članek v reviji 2024-01-17 15:24:09 2024-01-17 15:24:10 2024-01-18 03:42:11 0000-00-00 00:00:00 2022 0 0 10 str. Vol. 90, art. 106212 Nov. 2022 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 620.3:544.57 1350-4177 10.1016/j.ultsonch.2022.106212 128495875 1-s2.0-S135041772200308X-main.pdf 1-s2.0-S135041772200308X-main.pdf 1 5F9791F0CD171A675CAF6BCFE4340961 0bd17bad6c6aaf0b66e8454d29a1e74bef79e48386734731f6d458f26a06a113 831c14ab-b544-11ee-b3d9-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=180082 https://www.sciencedirect.com/science/article/pii/S135041772200308X 1 155194e2-b544-11ee-b3d9-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=180081 Fakulteta za kemijo in kemijsko tehnologijo Fakulteta za strojništvo 0 0 0