Stability of aqueous suspensions of titanate nanotubes

Bavykin, Dmitry V., Friedrich, Jens M., Lapkin, Alexei A. and Walsh, Frank C., Walsh, Frank C.(ed.) (2005) Stability of aqueous suspensions of titanate nanotubes Chemistry of Materials, 18, (5), pp. 1124-1129. (doi:10.1021/cm0521875).


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The long-term stability of titanate nanotubes, which were produced by alkaline hydrothermal treatment of TiO2, was studied at room temperature in acidic, pure water, and basic aqueous suspensions. In pure water and basic (0.1 mol dm-3 NaOH) solutions, the nanotubes were stable and minimal morphological changes occurred. In 0.1 mol dm-3 H2SO4, suspended titanate nanotubes slowly transformed to rutile nanoparticles of ca. 3 nm size, which were agglomerated into ellipsoidal particles. The porosity, crystal structure, and morphology of protonated titanates and TiO2 have been studied for intermediate states during the transformation by nitrogen adsorption, XRD, Raman spectroscopy, SEM, and HRTEM. The rate of conversion of nanotubes to nanoparticles has been related to the concentration of soluble titanium(IV) in solution, which depends on the nature of the acid. Thermodynamic and kinetic aspects of the acid transformation are discussed.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1021/cm0521875
ISSNs: 0897-4756 (print)
ePrint ID: 23913
Date :
Date Event
30 September 2005Submitted
7 December 2005Published
Date Deposited: 13 Mar 2006
Last Modified: 16 Apr 2017 22:43
Further Information:Google Scholar

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