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(a) Concentration of not-settled negatively charged (black squares) and positively charged (red circles) 100 nm diameter gold nanoparticles in water at 23°C together with predictions (lines) from the proposed modified Mason–Weaver model, and inset (b) UV–visible absorption spectra of positively charged nanoparticle solutions at the beginning of the experiment (black line) and after 240 min for solutions kept at 23°C (red line).
