Synthesis and characterization of zinc and copper oxide nanoparticles and their antibacteria activity

Asamoah, Richard; Yaya, Abu; Mensah, Bismark; Nbalayim, P.; Apalangya, Vitus A.; Bensah, Yaw Delali; Damoah, Lucas Nana Wiredu; Agyei‐Tuffour, Benjamin; Dodoo‐Arhin, David; Annan, Ebenezer

doi:10.1016/j.rinma.2020.100099

Cited by 38 publications

(21 citation statements)

References 10 publications

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“…ZnO/Ag particles required ultraviolet light for electron generation which interacts with bacterial cells resulting in ROS activities and subsequent cell death. Our calculated wavelength for ZnO/Ag agrees with earlier work on the wavelength of ZnO nanoparticles [ 20 ]. The energy band gap of ZnO/Ag was found to be 2.88 eV.…”

Section: Resultssupporting

confidence: 90%

“…Therefore, the high results obtained by clay/ZnO/Ag-1 and clay/ZnO/Ag-2 after 48 h of incubation confirm that the antibacterial activity of the pellets was dependent on time. The time-dependent nature of the antibacterial activity of the clay–nanocomposite pellets agrees with the antibacteria activity of CuO, ZnO, CuO/Ag and ZnO/Ag also investigated in other studies [ 19 , 20 , 33 ].…”

Section: Antibacterial Activity Of Clay–nanocompositessupporting

confidence: 86%

“…A similar study have mentioned the weak spectra peaks of silver observed in composites with low silver content [ 23 ]. The Scherer equation revealed that the average size of the ZnO/Ag particle was 36.17 nm which was comparable to that of copper oxide [ 20 ].…”

Section: Resultsmentioning

confidence: 99%

“…The difference in particle size recorded among CuO/Ag samples by TEM and XRD was attributed to the possibilities of agglomeration. In the past a broad range of bacteria strains have recorded susceptibility to CuO particles of similar features [ 20 ].…”

Section: Resultsmentioning

confidence: 99%

“…However, a study of the integrated effect of a nanocomposite comprising the synergy of a metal oxide and a metal incorporated within clay minerals remains uninvestigated. Meanwhile, copper oxide/silver (CuO/Ag) and zinc oxide/silver (ZnO/Ag) nanocomposites have independently shown broad-spectrum and a highly efficient antibacterial activities relative to their respective separate metal oxide and metal nanoparticle counterparts [ 19 , 20 ]. Clay–nanocomposite creates a synergy of antibacterial activity from both clay and nanocomposite (nanoparticles) with dominating antibacterial efficacy exhibited by the nanoparticle agents [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

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Development and Characterization of Clay–Nanocomposites for Water Purification

et al. 2020

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In this work we propose a facile method of preparing cost-effective clay-metaloxide/metal (CuO/Ag and ZnO/Ag) composite pellets for an efficient water purification technique. Clay, with intrinsic antibacterial activity, served as a membrane support for different metaloxide/Ag nanoparticles (NPs) concentrations (2.5, 5 and 10 wt.%), as the active fillers. The effect of time (24 and 48 h) on the bactericidal activity of these pellets was also monitored. The clay–nanocomposite pellets were characterized using: X-ray diffraction, X-ray fluorescence, scanning electron microscopy, transmission electron microscopy, ultraviolet–visible (UV–Vis) spectrophotometry and nitrogen desorption analysis. The antibacterial activity performance was tested using E. coli and S. aureus strains of ATCC25922 and ATCC25923, respectively, in two aqueous media (nutrient broth and nutrient-free) by the colony-forming unit method. The results showed that the clay-CuO/Ag composite with a bandgap (1.24 eV) exhibited overall best performance under all conditions and time factors of ~100% efficiency in nutrient-free medium for all concentrations and times and 20–40% efficiency in nutrient broth for 24 h. The clay-ZnO/Ag with a bandgap of 2.88 eV showed no bactericidal activity in both media, except for that with 10 wt.% ZnO/Ag which showed 100% efficiency in nutrient-free medium after 24 h. All the synthesized composites showed 100% bactericidal efficiency in nutrient free medium after 48 h. These results indicate that, the clay/metaloxide/Ag could serve as efficient water purification technique, with a potential for large-scale commercialization.

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Section: Resultssupporting

confidence: 90%

Section: Antibacterial Activity Of Clay–nanocompositessupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development and Characterization of Clay–Nanocomposites for Water Purification

et al. 2020

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Potential Wound Dressing with Antibacterial Effect from Cross‐Linked Polyvinyl Alcohol/Sodium Caseinate/CuO NP Electrospun Mat

Samatya Yilmaz,

Uzuner,

Aytac

2024

ChemistrySelect

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In this study, nanofibers were produced from Polyvinyl alcohol (PVA)/Sodium Caseinate (SoCAS)/Copper Oxide nanoparticle (CuO NP) mixtures by electrospinning method. Nano surfaces were cross‐linked by immersion in a Glutaraldehyde (GLA) bath. Electrospun mats are designed as modern wound dressings with antibacterial effects for exuding wounds. The cross‐linking process by dipping has thickened a bit of nanofiber diameter by creating a coating effect on fiber surface. The increase of acetal bonds and decrease of hydroxyl groups in structure by cross‐linking have improved thermal properties of nanofibers. The increase in melting enthalpy has also improved mechanical properties of mats. The mixture of semicrystalline PVA and SoCAS has increased breaking stress of nanostructure. Besides, the CuO NP additive improved the breaking strength and elongation behavior of mats. It was stated that cross‐linked nanofibers swelled without dissolving in distilled water and contained water‐repellent groups. The CuO NP supplementation delayed the growth of Escherichia coli (E. coli). However, it was observed that antibacterial effect against Staphylococcus aureus (S. aureus) was higher than against E. coli. It was reported that 5 % CuO NP‐doped nanofiber can be used as a wound dressing, owing to its high fibroblast cell viability at 24th and 48th hours and 99.48 % antibacterial activity against S. aureus.

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