821204.fig.001a
(a)
821204.fig.001b
(b)
821204.fig.001c
(c)
Figure 1: TGA (left vertical axe) and DTA (right vertical axe) analysis of samples: (a) urea, (b) TiO2, and (c) TiO2 + urea (N : Ti, 4 : 1).