RESUMO
Ultrasound irradiation was applied as a "throwing stones" technique for coating cotton bandages with MgO and Al(2)O(3) commercially obtained nanoparticles. The homogeneous distribution of the nanoparticles without any aggregation on the fabrics was demonstrated. The antibacterial activities of the MgO/Al(2)O(3)-fabric nanocomposite were tested against Escherichia coli (Gram negative) and Staphylococcus aureus (Gram positive) cultures. A significant bactericidal effect, even in a concentration <1% (by weight), was detected.
Assuntos
Antibacterianos/química , Escherichia coli/crescimento & desenvolvimento , Nanocompostos/química , Staphylococcus aureus/crescimento & desenvolvimento , Têxteis , Ultrassom , Óxido de Alumínio/química , Óxido de Magnésio/químicaRESUMO
A glass substrate, coated with a Parylene film, was coated with ZnO by three different methods: ultrasound, microwave, and microwave-plasma irradiation. These coating modes are simple, efficient, and environmentally friendly one-step processes. The structure of the coated products was characterized and compared using methods such as XRD, HR-SEM, EDS, RBS, and optical spectroscopy. Coating by ZnO nanoparticles was achieved for all three approaches. The products were found to differ in their particle sizes, coating thickness, and depth of penetration. All of the ZnO-Parylene-glass composites demonstrated a significant antibacterial activity against Escherichia coli (Gram negative) and Staphylococcus aureus (Gram positive) strains.
Assuntos
Anti-Infecciosos/farmacologia , Materiais Revestidos Biocompatíveis/química , Vidro/química , Micro-Ondas , Polímeros/química , Xilenos/química , Óxido de Zinco/química , Anti-Infecciosos/química , Escherichia coli/metabolismo , Teste de Materiais , Testes de Sensibilidade Microbiana , Modelos Químicos , Staphylococcus aureus/metabolismo , Difração de Raios XRESUMO
Zinc oxide (ZnO) nanoparticles were synthesized and deposited on the surface of cotton fabrics using ultrasound irradiation. Optimization of the process resulted in a homogeneous distribution of ZnO nanocrystals, 30 nm in size, on the fabric surface. The mechanism of the ultrasound-assisted coating was proposed. The antibacterial activities of the ZnO-fabric composite were tested against Escherichia coli (Gram negative) and Staphylococcus aureus (Gram positive) cultures. A significant bactericidal effect, even in a 0.75% coated fabric (wt %), was demonstrated.
