1. Geometric Mean Diameters and Geometric Standard Deviations of the Polydisperse Silica Particle Suspensions Calculated from Lognormal Probability Plot (Figure S2).

Sample	Measurement method	Geometric mean diameter (nm)	Geometric standard deviation
MEM medium	Dialysis and COA-DMAS	198.9 ± 1.3	1.76 ± 0.01
UPW medium	COA-DMAS	211.3 ± 0.7	1.76 ± 0.01
Reference value	SEM	209.9	1.75

^aStandard deviation for replicate measurements (n = 3).