Silicate Platelets Supporting Copper Oxide and Zinc Oxide Particles for Antimicrobial Uses
Date Issued
2016
Date
2016
Author(s)
Lee, Yi-Chen
Abstract
The hybrids of zinc oxide, copper (II) oxide, silver oxide nanoparticles on the nanoscale silicate platelets (NSP) are synthesized and characterized by UV-visible spectroscopy, X-ray powder diffraction, and TEM. We employ the exfoliated silicate platelets to support and stabilize the nanoparticles. The particles-on-platelet nanohybrids are successfully synthesized and the naked nanoparticles associated with the NSPs are formed without organics contamination. It is suggested that the NSPs are suitable for supporting nanoparticles owing to their high aspect–ratio and high surface ionic charges. We further investigate the bactericidal efficacy of ZnO/NSP and CuO/NSP as compared with the home-made Ag/NSP at the weight ratio of 15/85. The antimicrobial tests are performed on Escherichia coli and Staphylococcus aureus. Additionally, we synthesize the Ag/ZnO/NSP that ZnO is regarded as a promoter in the hybrids in antibacterial uses. Also, the differences of antibacterial activities between Ag/NSP and Ag/ZnO/NSP are investigated. And, it is found that CuO/NSP (15/85, w/w) show better antibacterial efficacy against S. aureus as compared with ZnO/NSP and Ag/NSP. And the Ag-contained nanohybrids (Ag/NSP and Ag/ZnO/NSP) are excellent antibacterial agents for E. coli. Among the Ag/ZnO/NSP, ZnO promote the antibacterial activity of Ag/NSP.
Subjects
nanohybrids
clay
nanoscale silicate platelets (NSP)
silver nanoparticles (Ag)
zinc oxide nanoparticles (ZnO)
copper (II) oxide nanoparticles (CuO)
antibacterial
Type
thesis