Figure 2.

Thermal analysis of urea-intercalated kaolinite with curve a as thermogravimetric analysis (left scale of y-axis), and curve b as derivative thermogravimetric analysis (right scale of y-axis).

Thermal analysis of urea-intercalated kaolinite with curve a as thermogravimetric analysis (left scale of y-axis), and curve b as derivative thermogravimetric analysis (right scale of y-axis).