Copper nano particles26 Oct 2022 23:37
Interesting reprts of copper nano particles in paints and surfaces. A small extract. Copper plate is less effective on its own and copper oxide has toxicities'
However the following is very promising
Our results showed that SARS-CoV-2 infectivity was inactivated 90% by 10 min, 97.8% by 30 min, and more than 99.995% by 60 min exposure to the CuNP/paint-coated surface (Fig. 4c), and the half-life was 0.16 h. In contrast, the virus infectivity was inactivated insignificantly in 60 min and by 97.8% in 18 h exposure to paint alone-coated and uncoated stainless steel surfaces. The inactivation rate on the CuNP/paint-coated surface was approximately 36-fold faster than that of the control surfaces. Van Doremalen et al. reported that the half-life of SARS-CoV-2 on the surface of copper metal remnants was 0.774 h4. An approximately 5 times shorter half-life for the CuNP/paint-coated surface, that is, 0.16 h, indicates that CuNPs are 5 times more efficient than copper metal to inactivate SARS-CoV-2 infectivity. Hutasoit et al. also reported that copper powders with particle sizes ranging from 5 to 60 µm coated on in-use steel parts could inactivate SARS-CoV-2 infectivity by 96% in 2 h21, whereas CuNPs/paint inactivated SARS-CoV-2 infection by 97.8% after 30 min of exposure. The reduction rate after 1 h on the surface of Cu2O particles of a mean size of 5.5 µm bound with polyurethane was approximately 99.9%20. In our study, the mean size of the CuNPs was 254 nm in diameter, 20-fold smaller than that, and the available surface area dramatically increased; thus, CuNPs had a one-order higher inactivation ability of more than 99.995% after 1 h of exposure.
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