What are the properties of ZnO nanoparticles?
ZnO nanoparticles have different shapes (rod-like, star-like and isometric) and a broad size distribution range of 30–150 nm. The ZnO particles were present mainly as clusters. ZnO nanoparticles have different shapes (rod-like, star-like and isometric) and a broad size distribution range of 30–150 nm.
What is the importance of ZnO nanoparticles?
The ZnO nanoparticles constitute an effective antimicrobial agent against pathogenic microorganisms. Basically the detected active oxygen species generated by these metal oxide particles could be the main mechanism of their antibacterial activity.
How do you synthesis zinc oxide nanoparticles?
Synthesis of ZnO nanoparticles. ZnO nanoparticles were prepared by refluxing precursor zinc acetate dihydrate (0.1 M) in diethylene glycol and triethylene glycol at 180 °C and 220 °C respectively. Reaction time varied for 2 and 3 h with and without sodium acetate (0.01 M).
What makes zinc oxide nano?
Zinc oxide nanoparticles are nanoparticles of zinc oxide (ZnO) that have diameters less than 100 nanometers. They have a large surface area relative to their size and high catalytic activity. The exact physical and chemical properties of zinc oxide nanoparticles depend on the different ways they are synthesized.
How are zinc oxide nanoparticles dispersed?
If you want to disperse the nanoparticles, then you have to do a surface modification. If the particles are ‘bare’ then perhaps increasing the pH helps to get some OH ions on the particle surface (ionic stabilization). Or you can add some surfactants to stabilize the particles in dispersion.
Why is zinc oxide important?
Zinc oxide is used as a bulking agent and a colorant. In over-the-counter drug products, it is used as a skin protectant and a sunscreen. Zinc oxide works as a sunscreen by reflecting and scattering UV radiation. Sunscreens reduce or prevent sunburn and premature aging of the skin.
What is the starting material used in synthesis of ZnO in lab?
The single step process with the large scale production without unwanted impurities is desirable for the cost-effective preparation of ZnO nanparticles. As a consequence, the low cost precursors such as zinc nitrate and sodium hydroxide to synthesize the ZnO nanoparticles (ca. 40 nm) were used.
How do you disperse zinc oxide?
Use 1-2% poly C10-30 alkylacrylate or polyethylene as SPF boosters when dispersing zinc oxide in the oil phase of a water-in-oil emulsion. They also can thicken the oil phase to help stabilize the water-in-oil emulsion and keep the zinc oxide from settling and possibly agglomerating.
What is the Colour of zinc oxide nanoparticles?
ZnO nanoparticles with various emission colors from blue to orange were synthesized through a facile precipitation method. The emission color of the ZnO nanoaprticles could be tuned by adjusting the pH value of the precipitation solution. The resultant ZnO nanoparticles are promising for cell labeling applications.