3D-TEM characterization of nanometric objects

Ersen, Ovidiu; Hirlimann, Charles; Drillon, Marc; Werckmann, J.; Tihay, F.; Pham‐Huu, Cuong; Crucifix, Corinne; Schultz, Patrick

doi:10.1016/j.solidstatesciences.2007.09.018

Cited by 65 publications

(50 citation statements)

References 46 publications

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“…Recent work has pointed out the high efficiency of defects decorated carbon nanotubes after treatment in the presence of ozone and water for anchoring gold nanoparticles [42]. The porous structure of the OGFs will be investigated in detail by mean of transmission electron microscopy tomography (TEM-3D) technique [43] to map out the porosity of the OGFs material and its influence on the metal nanoparticles dispersion.…”

Section: Characteristics Of the Acid Treated Graphite Feltsmentioning

confidence: 99%

Gaseous Nitric Acid Activated Graphite Felts as Hierarchical Metal-Free Catalyst for Selective Oxidation of H2S

Duong‐Viet

et al. 2018

Catalysts

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Abstract:In this study, we reported on the influence of gaseous HNO 3 treatment on the formation of defects decorated with oxygenated functional groups on commercial graphite felts (GFs). The gaseous acid treatment also leads to a remarkable increase of the specific as well as effective surface area through the formation of a highly porous graphite structure from dense graphite filamentous. The as-synthesized catalyst was further used as a metal-free catalyst in the selective oxidation of H 2 S in industrial waste effluents. According to the results, the defects decorated with oxygenated groups were highly active for performing selective oxidation of H 2 S into elemental sulfur. The desulfurization activity was relatively high and extremely stable as a function of time on stream which indicated the high efficiency of these oxidized un-doped GFs as metal-free catalysts for the selective oxidation process. The high catalytic performance was attributed to both the presence of structural defects on the filamentous carbon wall, which acting as a dissociative adsorption center for the oxygen, and the oxygenated functional groups, which could play the role of active sites for the selective oxidation process.

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Section: Characteristics Of the Acid Treated Graphite Feltsmentioning

confidence: 99%

Gaseous Nitric Acid Activated Graphite Felts as Hierarchical Metal-Free Catalyst for Selective Oxidation of H2S

Duong‐Viet

et al. 2018

Catalysts

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“…The opening pores on the particle surface are between 10 nm and 50 nm, thus providing the meso-channels to allow heavy crude oil molecules to reach the active sites. [22] The total surface area (external and internal) of the corresponding particle shown in Figure 1, calculated by counting the voxels of the surface material in contact with the vacuum, was 7.80 mm 2 . The volume of the same particle calculated by counting the voxels inside the particle material was 2.46 www.chemcatchem.org 7 nm 3 .…”

Section: Stem Haadf Tomographymentioning

confidence: 99%

STEM HAADF Tomography of Molybdenum Disulfide with Mesoporous Structure

Nan¹,

Song²,

Zhang³

et al. 2011

ChemCatChem

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A highly ordered mesoporous molybdenum disulfide has been developed for catalysis in heavy oil refining. The morphology, structure, and composition of the material have been systematically characterized with advanced electron microscopy techniques. Scanning transmission electron microscopy with high‐angle annular dark field tomography has been used to investigate the porous structure to give spatial information on the nanometre scale, and offer a direct view of individual porous particles in three‐dimensions. The pore‐size distribution, connectivity of the pores, and the mesoporous surface area have also been analyzed and offer useful information towards catalyst design.

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“…In addition to the classical analyses mentioned above, the F-50-3 sample was characterised by specific 3D-TEM analyse (three-dimensional Transmission Electron Microscopy) which consists in the volume reconstruction of an object from a series of projections recorded by turning the sample inside an electron microscope [25]. Its main advantage is the capability to yield information of volumetric character on complex objects.…”

Section: μMmentioning

confidence: 99%

New Aluminosilicate Materials with Hierarchical Porosity Generated by Aerosol Process

Chaumonnot

Tihay

Coupé

et al. 2009

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Matériaux aluminosilicates innovants à porosité hiérarchisée obtenus par voie aérosol -Cet article met en évidence le fort potentiel d'un procédé d'atomisation (ou procédé aérosol) pour obtenir de nouvelles familles de solides aluminosilicates présentant une porosité hiérarchisée dans la gamme de la micro à la macroporosité. Il est ainsi possible d'obtenir, en une seule étape de synthèse, et grâce à un procédé fonctionnant en continu, des aluminosilicates mésostructurés à forte teneur en aluminium, des solides composites constitués de nanocristaux de zéolithe piégés dans une matrice mésostructurée et des aluminosilicates micro, méso et macroporeux présentant des propriétés catalytiques en craquage du cumène inédites. Ces résultats prometteurs ouvrent des perspectives intéressantes pour le développement de nouveaux supports acides pour des catalyseurs d'hydrocraquage. Abstract -New Aluminosilicate Materials with Hierarchical Porosity Generated by Aerosol Process

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3D-TEM characterization of nanometric objects

Cited by 65 publications

References 46 publications

Gaseous Nitric Acid Activated Graphite Felts as Hierarchical Metal-Free Catalyst for Selective Oxidation of H2S

Gaseous Nitric Acid Activated Graphite Felts as Hierarchical Metal-Free Catalyst for Selective Oxidation of H2S

STEM HAADF Tomography of Molybdenum Disulfide with Mesoporous Structure

New Aluminosilicate Materials with Hierarchical Porosity Generated by Aerosol Process

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