Mg(OH)2 was first formed via reaction(1). As-obtained Mg(OH)2
precipitates subsequently dissociated stepwise into Mg(OH)
+
,
OH
, and Mg
2+
, but at very small extent, because of the small solu-bility product of Mg(OH)2[32]. Theoretically, CTAB, a cationic sur-factant at its high concentration, will form hexagonal-like-shaped
micelles and lamellar aggregates CTAB[33], which then acts as
reactive sites and can preferably make the electrostatic interaction
with negative charged OH
first and then with Mg(OH)
+
to form
CTA
+
–OH
–Mg(OH)
+
complex. Owing to these interactions, (2)
and (3)shifted to the right. Otherwise, CTAB firstly accelerates the
dissolution of small particles of Mg(OH)2and triggers the gradua