Fig. 5.

Experimental data and dissolution model fit to the dissolution data as a function of time for (a) Ag^Au₂₀NPs and (b) Ag^pi₂₀NPs. The vertical axis is plotted as [(M(0) − M(t))/M(0)] × 100 following Eq. (3). For each particle, the solid lines represent a single set of k₊ and K_sp values for that particle. Above solution concentrations of 9 μg/ml, the dissolution data can be approximately fit by single particle specific values. However, these values over predict dissolution that was observed for the lower concentrations of particles in solution, and the dashed lines are from fits to the 1 μg/ml data sets for each particle, with the values shown in Table II.