Synthesis, characterization and catalytic activity of highly ordered hexagonal and cubic composite monoliths

El‐Safty, Sherif A.

doi:10.1016/j.jcis.2007.12.010

Cited by 34 publications

(8 citation statements)

References 65 publications

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“…With the advent of nanotechnology, there has been a continuous increase in organic and inorganic core-shell nanoparticle discoveries with exceptional properties. 88 This gave rise to the discovery of several types of core-shell microstructures, such as spherical, 29,75,80,[89][90][91][92][93][94] hexagonal, 95,96 multiple cores within a single shell, 97,98 and onion-like, 99,100 movable core within shell 101,102 ; and 2D structures such as rods, 103,104 among others. So far there does not seem to be a generalized nomenclature for coreshell structures.…”

Section: Core-shell Approachmentioning

confidence: 99%

Core–Shell Lead–Free Piezoelectric Ceramics: Current Status and Advanced Characterization of the Bi_1/2Na_1/2TiO₃–SrTiO₃ System

et al. 2015

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The design of core-shell materials affords additional degrees of freedom to tailor functional properties as compared to solid solution counterparts. Although to date most of the work in core-shell materials has focused on dielectrics, piezoelectric coreshell ceramics may gain similar interest. Generalities of core-shell functional ceramics features are addressed in this work. A model system, Bi 1/2 Na 1/2 TiO 3 -SrTiO 3 , is introduced to discuss structure-property relationships. We demonstrate that this system features a core-shell microstructure for the composition corresponding to 25 at.% Sr. The material is studied by means of macroscopic functional properties and in situ structural characterization techniques at different length scales, such as X-ray diffraction, transmission electron microscopy, and Raman spectroscopy. The evolution of the core-shell with field and temperature determines its functional properties. The high strain of the system, 0.3% at 4 kV/mm, is due to an electric-field-induced phase transition of the core and shell. Upon field removal the core remains in a poled state, whereas the shell is characterized by a reversible transformation. The reversibility of the phase transition of shells and associated switching are key features in the observed giant strain. Dielectric anomalies are found to be related to changes in oxygen octahedral tilting angles within the core and shell.

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Section: Core-shell Approachmentioning

confidence: 99%

Core–Shell Lead–Free Piezoelectric Ceramics: Current Status and Advanced Characterization of the Bi_1/2Na_1/2TiO₃–SrTiO₃ System

et al. 2015

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“…The advances in new synthesis techniques make it possible to synthesize not only the symmetrical (spherical) shape nanoparticles but also a variety of other shapes such as cube, − prism, , hexagon, ,,− octahedron, , disk, wire, − rod, ,− tube, ,− etc.…”

Section: Introductionmentioning

confidence: 99%

Core/Shell Nanoparticles: Classes, Properties, Synthesis Mechanisms, Characterization, and Applications

2011

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“…Mesoporous inorganic monolithic membranes have received considerable interest in the last two decades because of their uniform and tunable pores with 2 and 3D hexagonal and cubic geometrical structures, thermal/ hydrothermal stability in organic and inorganic phases [30][31][32][33]. These mesoporous micrometric-size particle-like monoliths have many potentialities in control design of membrane applications in wide-range fields running from separation [34][35][36], catalysis [37,38] gas sensing [39] energy storage devices [40] to adsorption [2][3][4][5][6][7][8][19][20][21][22], Among these nanomaterials, 1D nanoscale channel-based materials have gained attention in recent years because of their unique electronic, optical, and mechanical properties as well as great potential for nanotechnology applications [41][42][43][44]. New types of hierarchical membrane materials for various industrial filtration applications have been synthesized [45][46][47][48][49][50].…”

Section: Introductionmentioning

confidence: 99%

Reproducible Design for the Optical Screening and Sensing of Hg(II) Ions

2014

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We fabricated silica nanotubes with hexagonally ordered mesopores (6 nm) inside a membrane disc with a uniform channel neck size of 200 nm and a longitudinal thickness of 60 μm to design an optical sensor membrane (OSM) for the screening and sensing of extremely toxic Hg(II) ions. The optical detection and quantitative recognition of Hg(II) ions in water were conducted even at trace concentrations without the need for sophisticated instruments. The OSM design was based on the physical interaction of a responsive organic probe with silica pore surfaces followed by strong and selective binding Hg(II)-probe interactions under specific sensing conditions, particularly at pH 5. Ultra-trace concentrations of Hg(II) ions were easily detected with the naked eye using the OSM. The remarkable ion spectral response of Hg(II) ion-OSM ensured the excellent quantification of the OSM for Hg(II) ion sensing over a wide range of concentrations with a detection limit of 1.75 × 10 −9 M. This result indicated that low concentrations of Hg(II) ions can be detected with a high sensitivity. One of the key issues of OSM is the Hg(II) ion-selective workability even in the presence of high doses of competitive matrices and species. The OSM design

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Synthesis, characterization and catalytic activity of highly ordered hexagonal and cubic composite monoliths

Cited by 34 publications

References 65 publications

Core–Shell Lead–Free Piezoelectric Ceramics: Current Status and Advanced Characterization of the Bi_1/2Na_1/2TiO₃–SrTiO₃ System

Core–Shell Lead–Free Piezoelectric Ceramics: Current Status and Advanced Characterization of the Bi_1/2Na_1/2TiO₃–SrTiO₃ System

Core/Shell Nanoparticles: Classes, Properties, Synthesis Mechanisms, Characterization, and Applications

Reproducible Design for the Optical Screening and Sensing of Hg(II) Ions

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Synthesis, characterization and catalytic activity of highly ordered hexagonal and cubic composite monoliths

Cited by 34 publications

References 65 publications

Core–Shell Lead–Free Piezoelectric Ceramics: Current Status and Advanced Characterization of the Bi1/2Na1/2TiO3–SrTiO3 System

Core–Shell Lead–Free Piezoelectric Ceramics: Current Status and Advanced Characterization of the Bi1/2Na1/2TiO3–SrTiO3 System

Core/Shell Nanoparticles: Classes, Properties, Synthesis Mechanisms, Characterization, and Applications

Reproducible Design for the Optical Screening and Sensing of Hg(II) Ions

Contact Info

Product

Resources

About

Core–Shell Lead–Free Piezoelectric Ceramics: Current Status and Advanced Characterization of the Bi_1/2Na_1/2TiO₃–SrTiO₃ System

Core–Shell Lead–Free Piezoelectric Ceramics: Current Status and Advanced Characterization of the Bi_1/2Na_1/2TiO₃–SrTiO₃ System