Surfactant-Free Solvothermal Method for Synthesis of Mesoporous Nanocrystalline TiO₂ Microspheres with Tailored Pore Size

Figure 3

N₂ adsorption/desorption curves of mesoporous TiO₂ microspheres prepared with different amounts of urea: (a) 8 mmol; (b) 12 mmol; (c) 16 mmol; (d) 20 mmol.

(a)

(b)

(c)

(d)