Article Dans Une Revue Journal of the American Chemical Society Année : 2007

Design of liquid-crystalline aqueous suspensions of rutile nanorods: Evidence of anisotropic photocatalytic properties

Arnaud Dessombz
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David Chiche
  • Fonction : Auteur
Pierre Panine
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Corinne Chanéac
Jean-Pierre Jolivet
  • Fonction : Auteur

Résumé

TiO2 rutile nanorods of average length L = 160 ± 40 nm and average diameter D = 15 ± 5 nm have been synthesized through a seed-mediated growth process by TiCl4 hydrolysis in concentrated acidic solution. These nanorods were dispersed in water to yield stable (aggregation-free) colloidal aqueous suspensions. At volume fractions φ > 3%, the suspensions spontaneously display a phase separation into an isotropic liquid phase and a liquid-crystalline phase identified as nematic by X-ray scattering. At φ > 12%, the suspensions form a nematic single phase, with large order parameter, S = 0.75 ± 0.05. Very well aligned rutile films on glass substrate were produced by spin-coating, arid their photocatalytic properties were examined by monitoring the decomposition of methylene blue under UV light. We found that UV-light polarized along the quadratic axis of the rutile nanorods was most efficient for this photocatalytic reaction.

Dates et versions

hal-04944557 , version 1 (13-02-2025)

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Citer

Arnaud Dessombz, David Chiche, Patrick Davidson, Pierre Panine, Corinne Chanéac, et al.. Design of liquid-crystalline aqueous suspensions of rutile nanorods: Evidence of anisotropic photocatalytic properties. Journal of the American Chemical Society, 2007, 129 (18), pp.5904-5909. ⟨10.1021/ja0684491⟩. ⟨hal-04944557⟩
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