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Direct Observation of Stacking Faults and Pore Connections in Ordered Cage-Type Mesoporous Silica FDU-12 by Electron Tomography.

Abstract : The porous structure and the periodic array of cavities in ordered mesoporous materials with large, three-dimensionally arranged and interconnected pores is thoroughly described by combining electron tomography, small-angle X-ray diffraction, and nitrogen sorption techniques. We used the ability of the electron tomography to provide local three-dimensional information of a nano-object and compared the results to those of the other characterization techniques which furnish global information. We showed thus that the face-centered cubic (fcc) structure usually assigned to the FDU-12 materials is in fact an intergrowth of cubic and hexagonal close-packing structures. This agrees with small-angle X-ray scattering (SAXS) modeling, but for the first time a direct visualization of these stacking faults was achieved. Three-dimensional transmission electron microscopy (3D-TEM) provides also a direct and unique evidence of peculiar stacking defects ("z-shifted [111] areas"), as well as an estimate of their density, which have never been reported elsewhere. In addition, interstitial cavities were also observed, revealing the complex defective structure of this material. A direct observation of the nature of the connecting pores was also achieved for the first time, with a resolution limit of 2 nm. Finally, the characteristics of the porous network evidenced by 3D-TEM are used to explain and validate the results obtained by nitrogen sorption experiments.
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https://www.hal.inserm.fr/inserm-00350870
Contributor : Maité Peney <>
Submitted on : Wednesday, January 7, 2009 - 4:57:24 PM
Last modification on : Wednesday, May 27, 2020 - 3:30:03 AM

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Ovidiu Ersen, Julien Parmentier, Leonid Solovyov, Marc Drillon, Cuong Pham-Huu, et al.. Direct Observation of Stacking Faults and Pore Connections in Ordered Cage-Type Mesoporous Silica FDU-12 by Electron Tomography.. Journal of the American Chemical Society, American Chemical Society, 2008, 130 (49), pp.16800-16806. ⟨10.1021/ja806267r⟩. ⟨inserm-00350870⟩

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