Mechanically stable flat anodic titania membranes for gas transport applications

Dmitry I. Petukhov, Andrei A. Eliseev, Irina V. Kolesnik, Kirill S. Napolskii, Alexey V. Lukashin, Alexey V. Garshev, Yuri D. Tretyakov, Dmitry Chernyshov, Wim Bras, Shu Fang Chen, Chuan-Pu Liu

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Anodic titanium oxide (ATO) membranes were produced by two-step anodic oxidation of titanium foil in ethylene glycol electrolyte containing NH 4F at the anodization voltage of 60 V. To provide the mechanical strength necessary for applying tubular anodic films as gas membranes, we utilized the formation of protective continuous TiO 2 layer at the top film surface prior to second anodization. As compared to conventional two-step anodic oxidation this technique decreases dissolution rates of titanium oxide phases with oxidation states lower than +4 (Ti 2O 3, Ti 3O 5), which are forming between titania nanotubes during anodization. The structural parameters of anodic titania films were determined by small-angle X-ray scattering and scanning electron microscopy techniques. According to SEM the proposed method resulted in growth of ATO films with a flat surface without nanotube endings, which enabled to use the films as gas separation membranes. The permeance of individual gases through ATO membranes were found to depend on gas molecular weight (M -0.5), with absolute values twice exceeding theoretical permeabilities as it was predicted by Knudsen diffusion (up to 63 m 3/(m 2 × bar × h) for nitrogen at 298 K). Here we ascribe this phenomenon to diffusion according to Knudsen-Smoluchoski mechanism (diffusion with slip, involving specular reflections of molecules), which is appropriate for membranes with straight pores and smooth internal pore surfaces.

Original languageEnglish
Pages (from-to)71-77
Number of pages7
JournalJournal of Porous Materials
Volume19
Issue number1
DOIs
Publication statusPublished - 2012 Feb 1

Fingerprint

Titanium oxides
Titanium
Gases
Membranes
Anodic oxidation
Nanotubes
Scanning electron microscopy
Ethylene glycol
X ray scattering
Ethylene Glycol
Metal foil
Oxide films
Strength of materials
Dissolution
Electrolytes
Molecular weight
titanium dioxide
Nitrogen
Oxidation
Molecules

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Petukhov, D. I., Eliseev, A. A., Kolesnik, I. V., Napolskii, K. S., Lukashin, A. V., Garshev, A. V., ... Liu, C-P. (2012). Mechanically stable flat anodic titania membranes for gas transport applications. Journal of Porous Materials, 19(1), 71-77. https://doi.org/10.1007/s10934-010-9449-2
Petukhov, Dmitry I. ; Eliseev, Andrei A. ; Kolesnik, Irina V. ; Napolskii, Kirill S. ; Lukashin, Alexey V. ; Garshev, Alexey V. ; Tretyakov, Yuri D. ; Chernyshov, Dmitry ; Bras, Wim ; Chen, Shu Fang ; Liu, Chuan-Pu. / Mechanically stable flat anodic titania membranes for gas transport applications. In: Journal of Porous Materials. 2012 ; Vol. 19, No. 1. pp. 71-77.
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abstract = "Anodic titanium oxide (ATO) membranes were produced by two-step anodic oxidation of titanium foil in ethylene glycol electrolyte containing NH 4F at the anodization voltage of 60 V. To provide the mechanical strength necessary for applying tubular anodic films as gas membranes, we utilized the formation of protective continuous TiO 2 layer at the top film surface prior to second anodization. As compared to conventional two-step anodic oxidation this technique decreases dissolution rates of titanium oxide phases with oxidation states lower than +4 (Ti 2O 3, Ti 3O 5), which are forming between titania nanotubes during anodization. The structural parameters of anodic titania films were determined by small-angle X-ray scattering and scanning electron microscopy techniques. According to SEM the proposed method resulted in growth of ATO films with a flat surface without nanotube endings, which enabled to use the films as gas separation membranes. The permeance of individual gases through ATO membranes were found to depend on gas molecular weight (M -0.5), with absolute values twice exceeding theoretical permeabilities as it was predicted by Knudsen diffusion (up to 63 m 3/(m 2 × bar × h) for nitrogen at 298 K). Here we ascribe this phenomenon to diffusion according to Knudsen-Smoluchoski mechanism (diffusion with slip, involving specular reflections of molecules), which is appropriate for membranes with straight pores and smooth internal pore surfaces.",
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Petukhov, DI, Eliseev, AA, Kolesnik, IV, Napolskii, KS, Lukashin, AV, Garshev, AV, Tretyakov, YD, Chernyshov, D, Bras, W, Chen, SF & Liu, C-P 2012, 'Mechanically stable flat anodic titania membranes for gas transport applications', Journal of Porous Materials, vol. 19, no. 1, pp. 71-77. https://doi.org/10.1007/s10934-010-9449-2

Mechanically stable flat anodic titania membranes for gas transport applications. / Petukhov, Dmitry I.; Eliseev, Andrei A.; Kolesnik, Irina V.; Napolskii, Kirill S.; Lukashin, Alexey V.; Garshev, Alexey V.; Tretyakov, Yuri D.; Chernyshov, Dmitry; Bras, Wim; Chen, Shu Fang; Liu, Chuan-Pu.

In: Journal of Porous Materials, Vol. 19, No. 1, 01.02.2012, p. 71-77.

Research output: Contribution to journalArticle

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T1 - Mechanically stable flat anodic titania membranes for gas transport applications

AU - Petukhov, Dmitry I.

AU - Eliseev, Andrei A.

AU - Kolesnik, Irina V.

AU - Napolskii, Kirill S.

AU - Lukashin, Alexey V.

AU - Garshev, Alexey V.

AU - Tretyakov, Yuri D.

AU - Chernyshov, Dmitry

AU - Bras, Wim

AU - Chen, Shu Fang

AU - Liu, Chuan-Pu

PY - 2012/2/1

Y1 - 2012/2/1

N2 - Anodic titanium oxide (ATO) membranes were produced by two-step anodic oxidation of titanium foil in ethylene glycol electrolyte containing NH 4F at the anodization voltage of 60 V. To provide the mechanical strength necessary for applying tubular anodic films as gas membranes, we utilized the formation of protective continuous TiO 2 layer at the top film surface prior to second anodization. As compared to conventional two-step anodic oxidation this technique decreases dissolution rates of titanium oxide phases with oxidation states lower than +4 (Ti 2O 3, Ti 3O 5), which are forming between titania nanotubes during anodization. The structural parameters of anodic titania films were determined by small-angle X-ray scattering and scanning electron microscopy techniques. According to SEM the proposed method resulted in growth of ATO films with a flat surface without nanotube endings, which enabled to use the films as gas separation membranes. The permeance of individual gases through ATO membranes were found to depend on gas molecular weight (M -0.5), with absolute values twice exceeding theoretical permeabilities as it was predicted by Knudsen diffusion (up to 63 m 3/(m 2 × bar × h) for nitrogen at 298 K). Here we ascribe this phenomenon to diffusion according to Knudsen-Smoluchoski mechanism (diffusion with slip, involving specular reflections of molecules), which is appropriate for membranes with straight pores and smooth internal pore surfaces.

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Petukhov DI, Eliseev AA, Kolesnik IV, Napolskii KS, Lukashin AV, Garshev AV et al. Mechanically stable flat anodic titania membranes for gas transport applications. Journal of Porous Materials. 2012 Feb 1;19(1):71-77. https://doi.org/10.1007/s10934-010-9449-2