SciELO - Scientific Electronic Library Online

vol.25 issue6AUsing nuclear magnetic resonance spectroscopy to study molecular diffusion in liquids: the DOSY techniqueSSPBE: a program for numerical solution of the spherically symmetric Poisson-Boltzmann equation along with a site binding model author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Química Nova

Print version ISSN 0100-4042On-line version ISSN 1678-7064


FARIAS, Robson Fernandes de. A new experimental procedure to obtain titania powders as anatase phase by a sol-gel process. Quím. Nova [online]. 2002, vol.25, n.6a, pp.1027-1028. ISSN 0100-4042.

Titania powders were synthesized by a sol-gel process using titanium tetrabutoxide as precursor. The syntheses were performed in water or in solutions of dimethylformamide (dmf) or dimethylsulfoxide (dmso). It is demonstrated, by X-ray diffraction patterns of the synthesized powders, that the samples obtained in dmf or dmso solutions are crystalline (anatase phase) with some minor amount of brookite phase, whereas the sample synthesized in water is amorphous. The anatase phase can be obtained independently of any previous or further treatment of the synthesized powder, such as hydrothermal or heat treatment, providing a new, simple, quick and inexpensive route to synthesize anatase powders. From the peak broadening of the anatase (101) diffraction, the crystallite sizes were calculated as 6 nm.

Keywords : titania; anatase; sol-gel; X-ray diffraction.

        · text in Portuguese     · Portuguese ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License