Figure 1

Antioxidation of ultra-small N₂ NBs. (a) Oxidation curves of TMB in water containing the ultra-small N₂ NBs. (b) Comparison of the relative oxide value of the ultra-small N₂ NBs with the sodium ascorbate with different concentrations. The oxidation curves of TMB in water containing different concentrations of sodium ascorbate were firstly measured like (a). Then the maximum absorption value was obtained from each oxidation curve. The relative oxide value of each item was calculated with: \(Relative oxide\;value\;\left( {item} \right) = \frac{{Max\;absorbance\;\left( {item} \right)}}{{Max\;absorbance\;\left( {without\;NBs} \right)}}\). (c) NB size distribution measured by NTA (upper) and DLS (bottom). Circles highlighted the peak of the NBs with a size of about 50 nm. (d) Oxidation curves of TMB in ultra-small N₂ NBs-containing water before and after degassing.