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

Table 1

Textural and structural parameters of mesoporous TiO₂ samples prepared with different amounts of urea.

Urea (mmol)	Phase	Crystallite size^a; (nm)	BET surface area^b; (m^2/g)	Pore volume^c; (cm^3/g)	Average pore diameter^d; (nm)
8	Anatase	12.2	1.09	0.002	3.5
12	Anatase	10.4	57.35	0.085	5.6
16	Anatase	9.2	42.45	0.045	3.8
20	Anatase	8.7	3.76	0.015	4.3

aCrystallite size was calculated from the Scherrer equation based on the diffraction peak (101). ^bThe specific surface area was calculated by BET method. ^cThe total pore volume is taken from the adsorption branch of the nitrogen isotherm curve. ^dThe average pore diameter is estimated using the adsorption branch of the isotherm and BJH model.