3.4. Thermal analysis data studies
The thermal analysis data and thermogravimetric analysis
(DTA/TG) curves of the prepared sample are shown in Fig. 7. From
Fig. 7, partial loss of adsorbed water at 75.54 C and all adsorbed
water is lost at 108.85 C. The total weight loss is about 6% (very
small) at room temperature to 800 C due to there is no organic
decomposition in the heating process.
3.5. Mechanism
In case of inorganic materials which characterized by positive
tetrahedron with Na+ central body in his positive tetrahedral model,
Na+ plays a role as positive templating agent instead of organic
templates through enhancing nucleation process which leads to
forming smaller crystals [24,25]. It was investigated that adding
a certain amount of Na+ cation can stimulate the growth of crystals
and the crystal size was decreased with the increase of Na2O