In this study, a hybrid Ag-ZnO nanostructured micro-filler was synthesized by the drop technique for used in plastic and medical industry. Furthermore, new antibacterial polymer nanocomposites comprising particles of Ag-ZnO up to 5 wt % and a blend of a thermoplastic polyolefin elastomer (TPO) with polypropylene were prepared using twin screw micro-compounder. The morphology and crystalline-phase structure of the hybrid Ag-ZnO nanostructured microparticles obtained was characterized by scanning electron microscopy and powder X-ray diffractometry. The specific surface area of this filler was investigated by means of nitrogen sorption via the Brunauer-Emmet-Teller method. A scanning electron microscope was used to conduct a morphological study of the polymer nanocomposites. Mechanical and electrical testing showed no adverse effects on the function of the polymer nanocomposites either due to the filler utilized or the given processing conditions, in comparison with the neat polymer matrix. The surface antibacterial activity of the compounded polymer nanocomposites was assessed against Escherichia coli ATCC 8739 and Staphylococcus aureus ATCC 6538P, according to ISO 22196:2007 (E). All the materials at virtually every filler-loading level were seen to be efficient against both species of bacteria.

• Klíčová slova
• Ag-ZnO, antibacterial, hierarchical, nanocomposites, polypropylene, thermoplastic elastomers,
• Publikační typ
• časopisecké články MeSH

Hybrid inorganic-organic fillers based on nanostructured silver/zinc oxide decorations on micro-cellulose carrier particles were prepared by stepwise microwave assisted hydrothermal synthesis using soluble salts as precursors of silver and zinc oxide. Hexamethylenetetramine was used as precipitating agent for zinc oxide and reducing agent for silver. The inorganics covered all available surfaces of the cellulose particles with a morphology resembling a coral reef. Prepared particulate fillers were compounded to medical grade poly(vinyl chloride) matrix. Scanning electron microscopy and powder X-ray diffractometry were used to investigate the morphology and crystalline phase structure of fillers. The scanning electron microscopy was used for morphological study of composites. With respect to prospective application, the composites were tested on electrical and antibacterial properties. A small effect of water absorption in polymer composites on their dielectric properties was observed but no adverse effect of water exposure on prepared materials was manifested. Electrical conductivity of fillers and composites was measured and no influence of water soaking of composites was found at all. The surface antibacterial activity of prepared composites was evaluated according to the standard ISO 22196. Excellent performance against Escherichia coli and very high against Staphylococcus aureus was achieved.

• MeSH
• antibakteriální látky chemie   farmakologie   MeSH
• biokompatibilní materiály chemická syntéza   MeSH
• celulosa chemie   MeSH
• fyziologie bakterií účinky léků   MeSH
• kovové nanočástice chemie   ultrastruktura   MeSH
• nanokompozity chemie   ultrastruktura   MeSH
• oxid zinečnatý chemie   MeSH
• polyvinylchlorid chemie   MeSH
• povrchové vlastnosti MeSH
• prášky, zásypy, pudry MeSH
• stříbro chemie   farmakologie   MeSH
• testování materiálů MeSH
• velikost částic MeSH
• viabilita buněk fyziologie   MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Názvy látek
• antibakteriální látky MeSH
• biokompatibilní materiály MeSH
• celulosa MeSH
• oxid zinečnatý MeSH
• polyvinylchlorid MeSH
• prášky, zásypy, pudry MeSH
• stříbro MeSH