INVESTIGATION OF THE DISPERSION STATE OF COPPER NANOPARTICLES IN AN AQUEOUS MEDIUM BY DYNAMIC LIGHT SCATTERING

We investigated an aqueous copper-containing dispersion formed during the synthesis of nanoparticles on cellulose paper using ascorbic acid by dynamic light scattering. We identified a multimodal intensity-weighted distribution, with maxima at 108.6, 313.1, and 2.5 × 10⁴ nm and relative integrated coefficients of 5.3, 58.2, and 36.5%, respectively. The dominant submicrometre component had a mean size coordinate of 292.4 nm and a standard deviation of 106.4 nm. Independent analysis of the main region spanning 74.2–455.7 nm yielded a weighted mean coordinate of 261.4 nm and a median of 248.8 nm. An anomalous large-size tail, with a weight contribution of 2.28%, accounted for 99.56% of the first arithmetic moment, limiting the applicability of the overall mean. The results characterize the size heterogeneity of the dispersion in the liquid phase and support separate evaluation of the submicrometre and large-size responses. The integrated coefficients are not equated with particle-number or mass fractions.

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