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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.


Related in: MedlinePlus

SEM micrographs of ZnO prepared using hydrothermal technique with different surfactant agents: (a) PVP, (b) PVA, (c) CTAB, (d) TEA, and (e) PEG.
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fig10: SEM micrographs of ZnO prepared using hydrothermal technique with different surfactant agents: (a) PVP, (b) PVA, (c) CTAB, (d) TEA, and (e) PEG.

Mentions: (ii) Morphological Structure (SEM). The different attained zinc oxide morphological structures according to the surfactant variation are investigated in Figure 10. These images showed that ZnO morphologies were strongly dependent on the surfactant type in the hydrothermal process. Figure 10(a) showed the formation of nanorods in the presence of PVP as surfactant. Also, hexagonal hollow tubes are formed using PVA surfactant. However, it is believed that the mechanism of ZnO nanotubes from nanowire-rod-like ZnO powders can be explained with the Kirkendall effect [42, 43]. In the Kirkendall effect, diffusion of atoms causes oversaturation of lattice voids. It is considered that this oversaturation causes condensation of more voids close to the interface. Therefore, these Kirkendall voids change properties of the interface and force it to form multiwalled nanotubes [28]. Furthermore, the presence of other studied surfactants (CTAB, TEA, and PEG) tends to form nanorods ZnO.


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 with different surfactant agents: (a) PVP, (b) PVA, (c) CTAB, (d) TEA, and (e) PEG.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig10: SEM micrographs of ZnO prepared using hydrothermal technique with different surfactant agents: (a) PVP, (b) PVA, (c) CTAB, (d) TEA, and (e) PEG.
Mentions: (ii) Morphological Structure (SEM). The different attained zinc oxide morphological structures according to the surfactant variation are investigated in Figure 10. These images showed that ZnO morphologies were strongly dependent on the surfactant type in the hydrothermal process. Figure 10(a) showed the formation of nanorods in the presence of PVP as surfactant. Also, hexagonal hollow tubes are formed using PVA surfactant. However, it is believed that the mechanism of ZnO nanotubes from nanowire-rod-like ZnO powders can be explained with the Kirkendall effect [42, 43]. In the Kirkendall effect, diffusion of atoms causes oversaturation of lattice voids. It is considered that this oversaturation causes condensation of more voids close to the interface. Therefore, these Kirkendall voids change properties of the interface and force it to form multiwalled nanotubes [28]. Furthermore, the presence of other studied surfactants (CTAB, TEA, and PEG) tends to form nanorods ZnO.

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