Table 1.
Cumulant and modal hydrodynamic diameters obtained from volume-based differential light intensity distributions. The polydispersity index (PDI) shows the relative spread of particle sizes for the cumulant diameter, an average taken from cumulant fitting. The smaller the PDI, the more monodisperse the size population is.
| Modal diametera (nm) | Cumulant diameterb (nm) | Polydispersity index | |
|---|---|---|---|
| pH 2 (days) | |||
| 0 | 13.1 ± 1.9 | 16.2 ± 3.13 | 0.108 ± 0.014 |
| 1 | 12.0 ± 1.9 | 17.7 ± 1.21 | 0.341 ± 0.010 |
| 2 | 12.7 ± 2.4 | 38.8 ± 4.74 | 0.215 ± 0.008 |
| 3 | 11.4 ± 1.9 | 20.2 ± 1.40 | 0.289 ± 0.015 |
| 4 | 11.3 ± 2.5 | 279 ± 22.1 | 0.154 ± 0.004 |
| 5 | 14.9 ± 3.7 | 194 ± 11.0 | 0.216 ± 0.002 |
| 6 | 12.8 ± 2.6 | 70.3 ± 14.9 | 0.217 ± 0.014 |
| pH 9 (weeks) | |||
| 0 | 10.3 ± 3.5 | 278.1 | 0.152 |
| 1 | 12.2 ± 3.6 | 257.3 | 0.353 |
| 2 | 9.3 ± 3.8 | 344.7 | 0.181 |
| 4 | 9.3 ± 3.2 | 157 | 0.171 |
| 5 | 11.0 ± 3.7 | 363.1 | 0.211 |
| 6 | 10.6 ± 4.0 | 372.9 | 0.208 |
| 7 | 9.3 ± 2.8 | 140.8 | 0.187 |
a
The modal diameter is the most populated size, otherwise measured as the peak of the differential intensity distribution.
b
Cumulant diameters found from fitting the autocorrelation function.