Table 1.

pH and particle size of aqueous solutions containing nanoparticles.

	pH	dp50 [nm]
SiO2+HCl	0.93	37.7
SiO2+HCl+LiNO3	1.06	56.7
SiO2+HCl+NaNO3	1.13	55.4
SiO2+HCl+KNO3	1.19	45.1
Al2O3+HCl	0.89	108
Al2O3+HCl+LiNO3	1.03	105
Al2O3+HCl+NaNO3	1.05	96.7
Al2O3+HCl+KNO3	1.13	188