CuO and CuO/Vermiculite Based Nanoparticles in Antibacterial PVAc Nanocomposites
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CuO and CuO/Vermiculite Based Nanoparticles in Antibacterial PVAc Nanocomposites Karla Čech Barabaszová1 · Sylva Holešová1 · Martin Bílý1 · Marianna Hundáková1 Received: 25 February 2020 / Accepted: 30 April 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Copper oxide (CuO) nanoparticles are used in a wide range of applications due to its specific chemical, surface and microstructural characteristics, excellent physicochemical properties and cost effectiveness. The combination of the CuO with the vermiculite (V) particles allows to the preparation of nanostructured materials with specific properties. CuO nanoparticles were prepared by sonochemical synthetic method followed by a heat treatment (at 350 °C for 90 min) with the used of Cu(NO3)2 and NaOH precursors. Natural V was used for nanocomposite structures preparation (CuO/V). The nanostructured samples were characterized using scanning electron microscopy and X-ray diffraction. The particle size (median diameter, d50), ξ-potential and specific surface area were analysed. The antibacterial efficiency was evaluated by finding the minimum inhibitory concentration against Staphylococcus aureus and Enterococcus faecalis. The polyvinyl acetate (PVAc) nanocomposite plates were prepared using 0.1, 0.5 and 1 wt% of CuO (respectively CuO/V) nanostructured materials as functional nanofillers and were characterized by X-ray diffraction, scanning electron microscopy and 3D optical light microscope. The positive effect of vermiculite particles on homogeneous distribution in PVAc matrix was shown. The antibacterial activity was evaluated against Staphylococcus aureus and Enterococcus faecalis. Significant antibacterial behavior with long-acting after 24 h against Staphylococcus aureus was evaluated for all PVAc nanocomposites. The results show that already 0.1 wt% of CuO nanofillers (respectively CuO/V) in the PVAc matrix produce an antibacterial surface against Staphylococcus aureus. Keywords Copper oxide nanoparticles · Vermiculite · PVAc nanocomposites · Antibacterial activity
1 Introduction Polymer nanocomposites can be considered as materials that contain modest amounts of nanoparticles fillers which compared to pristine polymer demonstrate the amazing advantages and improvement of structure, electrical and optical properties, biocompatibility and biodegradability in various industrial, medical, drug release, packaging and * Karla Čech Barabaszová [email protected] Sylva Holešová [email protected] Martin Bílý [email protected] Marianna Hundáková [email protected] 1
Nanotechnology Centre, VŠB - Technical University of Ostrava, 17. listopadu 15/2172, Poruba, 708 00 Ostrava, Czech Republic
agricultural applications. New bonds and other interactions between nanofiller and polymer matrix arise within the polymer structure creating the novel properties of these polymer nanocomposites. Polyvinyl acetate (PVAc) is widely and commonly used polymer material and it features excellent adhesion to various substra
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