Zinc Oxides – Behaviour

In the aqueous environment of the human organism, zinc oxide (ZnO) nanoparticles dissolve partly or completely releasing zinc ions. This process of dissolution, however, is not equally efficient for the different particles and depends, moreover, on the exact composition of the aqueous solution. Hence, the stability of the nanoparticles in the respective environment seems to decide on the uptake by the cells of either ZnO particles or dissolved zinc ions.

Zinc oxide nanoparticles are positively charged and belong to the group of soluble nanoparticles. They show a strong agglomeration tendency and are prone to dissolving meaning that in addition to the actual nanoparticles there are always dissolved zinc ions present in aqueous solution. Most data on zinc oxide nanoparticles is available for their behaviour in water and soil, whereas up-to-now no information could be retrieved for air.

 

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