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Showing 3 results for Zinc Oxide
Synthesis of Zinc/Zinc Oxide Nanoparticles by Electric Discharge Method in Distilled-Water and Argon-Gas Environments
T. Rajabi, M. Vahedi, S. K. Sadrnezhaad,
Volume 39, Issue 2 (8-2020)
Abstract
Zinc/zinc oxide nanoparticles are used in an increasing number of medical and industrial applications due to their attractive physical, chemical and antibacterial properties. Therefore, achieving a simple and beneficial way to produce them is an important aspect. In this study, zinc/zinc oxide nanopowders were synthesized by fast electric discharges between two electrodes of (a) a spark device in distilled water medium and (b) a handmade high-voltage ignition machine in argon gas medium. The resulting powders were characterized by x-ray diffraction (XRD), dynamic light scattering (DLS) and field emission electron microscopy (FESEM). Using the spark device in distilled water, a mixture of zinc crystals with an average diameter of 11.28 nm and zinc oxide crystals with an average diameter of 22.22 nm was produced. However, using the handmade device in argon, zinc crystals with an average diameter of 7.5 nm were obtained and subsequently oxidized due to their extremely high activity. The production rate of the high voltage discharge method was lower than other conventional methods. On the other hand, its ability in reducing the size and increasing the particle activity was higher than other methods.

INVESTIGATION OF THE INFLUENCE OF ZINC OXID CONTENT AND SCAFFOLD MORPHOLOGY ON THE MECHANICAL PROPERTIES OF POLY(ε-CAPROLACTONE) / ZINC OXIDE NANOCAMPOSITE SCAFFOLDS
F. Rafati, N. Johari, F. Zohari,
Volume 40, Issue 4 (3-2022)
Abstract
In the present study, PCL/ZnO nanocomposite scaffolds containing 0, 5, and 15 wt.% of ZnO nanoparticles were prepared via the salt leaching/solvent casting method. The influence of ZnO nanoparticles on the morphology of prepared PCL/ZnO scaffolds was investigated using SEM images. The compressive strength test evaluated the effect of scaffolds’ morphology on mechanical properties. The XRD technique confirmed the desired phases in the scaffold composition. The results showed that the compressive strength and structural integrity of the scaffolds increased by increasing ZnO nanoparticles content as the reinforcement. However, the compressive strength and structural integrity decreased by increasing the amount of ZnO nanoparticles up to more than 5 wt.%. In summary, PCL/ZnO nanocomposite scaffold containing 5 wt.% of ZnO nanoparticles revealed the highest strength, compressive modulus, and structural integrity.

EVALUATION OF ANTIBACTERIAL PROPERTIES OF POLYLACTIC ACID-POLYCAPROLACTONE-CONTAINING HYDROXYAPATITE AND ZINC OXIDE NANOPARTICLES IN HARD TISSUE ABSORBABLE SCAFFOLDS
F. Dehghani Firoozabadi, A. Ramazani Saadatabadi, A. Asefnejad,
Volume 41, Issue 1 (8-2022)
Abstract
Today, many people need to use bone grafts and implants because of damage to bone tissue. Due to the stimulation of the immune system after implantation, infection at the operation site is very common, which causes swelling and pain in the operation area. The use of zinc oxide nanoparticles reduces infection at the operation site and reduces the patient's need for antibiotics. In the present study, the morphology of the scaffolds was investigated by field emission scanning electron microscope (FE-SEM). The toxicity of the samples was evaluated using MTT assay. The behavior of nanocomposites against Escherichia coli and Staphylococcus aureus was investigated by measuring the diameter of the growth inhibition zone. It was found that modification of scaffolds with nanoparticles caused a growth inhibition in bacterial culture medium. It was also observed that fibroblast cells on the surface of the modified scaffolds had longer survival than polymer scaffolds. This study showed that the addition of oxidizing nanoparticles improves the antibacterial properties of scaffolds and cell viability and reduces scaffold toxicity.

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