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Construction of Zinc Oxide into Different Morphological Structures to Be Utilized as Antimicrobial Agent against Multidrug Resistant Bacteria.

Elkady MF, Shokry Hassan H, Hafez EE, Fouad A - Bioinorg Chem Appl (2015)

Bottom Line: Nano-ZnO has been successfully implemented in particles, rods, and tubes nanostructures via sol-gel and hydrothermal techniques.The activity of produced nano-ZnO was determined by disc diffusion technique and the results revealed that ZnO nanotubes recorded high activity against the studied strains due to their high surface area equivalent to 17.8 m(2)/g.Although the annealing process of ZnO improves the degree of material crystallinity, however, it declines its surface area and consequently its antimicrobial activity.

View Article: PubMed Central - PubMed

Affiliation: Fabrication Technology Department, Advanced Technology and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications, Alexandria 21934, Egypt ; Chemical and Petrochemical Engineering Department, Egypt-Japan University of Science and Technology, New Borg El-Arab City, Alexandria 21934, Egypt.

ABSTRACT
Nano-ZnO has been successfully implemented in particles, rods, and tubes nanostructures via sol-gel and hydrothermal techniques. The variation of the different preparation parameters such as reaction temperature, time, and stabilizer agents was optimized to attain different morphological structures. The influence of the microwave annealing process on ZnO crystallinity, surface area, and morphological structure was monitored using XRD, BET, and SEM techniques, respectively. The antimicrobial activity of zinc oxide produced in nanotubes structure was examined against four different multidrug resistant bacteria: Gram-positive (Staphylococcus aureus and Bacillus subtilis) and Gram-negative (Escherichia coli and Pseudomonas aeruginosa) strains. The activity of produced nano-ZnO was determined by disc diffusion technique and the results revealed that ZnO nanotubes recorded high activity against the studied strains due to their high surface area equivalent to 17.8 m(2)/g. The minimum inhibitory concentration (MIC) of ZnO nanotubes showed that the low concentrations of ZnO nanotubes could be a substitution for the commercial antibiotics when approached in suitable formula. Although the annealing process of ZnO improves the degree of material crystallinity, however, it declines its surface area and consequently its antimicrobial activity.

No MeSH data available.


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SEM micrographs of ZnO prepared using hydrothermal technique at different reaction temperatures: (a) 60°C, (b) 70°C, (c) 80°C, and (d) 90°C.
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fig12: SEM micrographs of ZnO prepared using hydrothermal technique at different reaction temperatures: (a) 60°C, (b) 70°C, (c) 80°C, and (d) 90°C.

Mentions: (ii) Morphological Structure (SEM).Figure 12 illustrated the surface morphology of nano-zinc oxide produced at different reaction temperatures. It is observed that ZnO formed at 60, 70, and 80°C has nanorods configuration with aspect ratio 6 (Figures 12(a), 12(b), and 12(c)); however, that produced at 90°C has nanoplates morphology. Nevertheless, with lower growth temperature below 90°C, the formed ZnO produced nanorods. This may be owing to the decrease in the growth rate. Where, at low temperatures, the growth kinetic tends to be slow, two-dimensional (2D) growth of nanospecies takes place which leads to formation of rod morphology. However, the rise in temperature increases the reaction rate, so ZnO grains rapidly grow, which leads to formation of hexagonal particles and belts with random orientations [33].


Construction of Zinc Oxide into Different Morphological Structures to Be Utilized as Antimicrobial Agent against Multidrug Resistant Bacteria.

Elkady MF, Shokry Hassan H, Hafez EE, Fouad A - Bioinorg Chem Appl (2015)

SEM micrographs of ZnO prepared using hydrothermal technique at different reaction temperatures: (a) 60°C, (b) 70°C, (c) 80°C, and (d) 90°C.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4588359&req=5

fig12: SEM micrographs of ZnO prepared using hydrothermal technique at different reaction temperatures: (a) 60°C, (b) 70°C, (c) 80°C, and (d) 90°C.
Mentions: (ii) Morphological Structure (SEM).Figure 12 illustrated the surface morphology of nano-zinc oxide produced at different reaction temperatures. It is observed that ZnO formed at 60, 70, and 80°C has nanorods configuration with aspect ratio 6 (Figures 12(a), 12(b), and 12(c)); however, that produced at 90°C has nanoplates morphology. Nevertheless, with lower growth temperature below 90°C, the formed ZnO produced nanorods. This may be owing to the decrease in the growth rate. Where, at low temperatures, the growth kinetic tends to be slow, two-dimensional (2D) growth of nanospecies takes place which leads to formation of rod morphology. However, the rise in temperature increases the reaction rate, so ZnO grains rapidly grow, which leads to formation of hexagonal particles and belts with random orientations [33].

Bottom Line: Nano-ZnO has been successfully implemented in particles, rods, and tubes nanostructures via sol-gel and hydrothermal techniques.The activity of produced nano-ZnO was determined by disc diffusion technique and the results revealed that ZnO nanotubes recorded high activity against the studied strains due to their high surface area equivalent to 17.8 m(2)/g.Although the annealing process of ZnO improves the degree of material crystallinity, however, it declines its surface area and consequently its antimicrobial activity.

View Article: PubMed Central - PubMed

Affiliation: Fabrication Technology Department, Advanced Technology and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications, Alexandria 21934, Egypt ; Chemical and Petrochemical Engineering Department, Egypt-Japan University of Science and Technology, New Borg El-Arab City, Alexandria 21934, Egypt.

ABSTRACT
Nano-ZnO has been successfully implemented in particles, rods, and tubes nanostructures via sol-gel and hydrothermal techniques. The variation of the different preparation parameters such as reaction temperature, time, and stabilizer agents was optimized to attain different morphological structures. The influence of the microwave annealing process on ZnO crystallinity, surface area, and morphological structure was monitored using XRD, BET, and SEM techniques, respectively. The antimicrobial activity of zinc oxide produced in nanotubes structure was examined against four different multidrug resistant bacteria: Gram-positive (Staphylococcus aureus and Bacillus subtilis) and Gram-negative (Escherichia coli and Pseudomonas aeruginosa) strains. The activity of produced nano-ZnO was determined by disc diffusion technique and the results revealed that ZnO nanotubes recorded high activity against the studied strains due to their high surface area equivalent to 17.8 m(2)/g. The minimum inhibitory concentration (MIC) of ZnO nanotubes showed that the low concentrations of ZnO nanotubes could be a substitution for the commercial antibiotics when approached in suitable formula. Although the annealing process of ZnO improves the degree of material crystallinity, however, it declines its surface area and consequently its antimicrobial activity.

No MeSH data available.


Related in: MedlinePlus