This can be proven by TE1–TE8 and TE8–TE9 in Table 1,
respectively. The ions concentration reduces the double layer
thickness making repulsive potential decline and leads to a dispersion
that is more easily flocculated [26]. An increase in the concentration
of NH3 and H2O will not only stabilize the suspension
(through the production of more OH) by increasing the net negative
charges on the particles, but also destabilize the dispersion
resulting from an increase in the ionic strength through the production
of ions. That is, at certain concentrations of H2O and
NH3, the destabilizing effects will influence the size distribution
more remarkably comparing with the increase in surface charges,
and aggregations can be formed [26]. As a proof, A5 particles (in
Table 3) with a diameter of 616 nm aggregated at 1.06 M NH3.