The Experts below are selected from a list of 9234 Experts worldwide ranked by ideXlab platform
J.a. Shelnutt - One of the best experts on this subject based on the ideXlab platform.
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silica Metal core Shells and Metal Shells synthesized by porphyrin assisted photocatalysis
Chemistry of Materials, 2008Co-Authors: Haorong Wang, Yujiang Song, Craig J Medforth, Zhongchun Wang, James E Miller, Lindsey R Evans, J.a. ShelnuttAbstract:Uniform silica beads modified with a positively charged tin porphyrin (SnT(NMe4Py)P) adsorbed onto their surface are used as photocatalytically active templates to synthesize platinum and palladium shell and core−shell nanostructures. The cationic porphyrin SnT(NMe4Py)P serves a dual function, acting as both a photocatalyst to reduce Metal ions and nucleate growth sites and as a surface modifier that promotes binding of platinum Metal to the surface of the nanospheres. Hollow platinum nanoShells can then be produced by removing the silica cores using hydrofluoric acid. Magnetic silica−platinum core−shell spheres can also be prepared starting from silica spheres containing magnetite nanoparticles. The silica−porphyrin−platinum nanocomposites contain all the components necessary to produce hydrogen gas via a tin porphyrin-mediated reductive photocatalytic process using a sacrificial electron donor. However, due to instability of the SnT(NMe4Py)P, hydrogen production can only be realized when a degradation-r...
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Interfacial Synthesis of Dendritic Platinum NanoShells Templated on Benzene Nanodroplets Stabilized in Water by a Photocatalytic Lipoporphyrin
Journal of the American Chemical Society, 2006Co-Authors: Haorong Wang, Yujiang Song, Craig J Medforth, J.a. ShelnuttAbstract:Nanoscale Metal Shells have many potential uses and in some applications offer significant advantages over nanoparticles. The synthesis of platinum nanoShells using stabilized nanodroplets of benzene in water as growth templates is described; the nanodroplets are stabilized by a surfactant-like tin(IV)−porphyrin complex localized at the benzene−water interface. The porphyrin also acts as a photocatalyst that reduces the platinum complex and deposits Metal onto the nanodroplets to form dendritic Metal nanoShells. Below the solubility limit of benzene in water, the lipoporphyrin-stabilized nanodroplets have a reproducible number, size distribution, and surface area, which allows the thickness of the platinum shell walls to be controlled by changing the amount of platinum complex. Nanoscale platinum Shells with magnetic interiors can be made by dispersing Fe3O4 nanoparticles in the benzene nanodroplets.
Takeshi Inaoka - One of the best experts on this subject based on the ideXlab platform.
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Thickness Dependence of Electronic Structure of Small Spherical Metal Shells
Journal of the Physical Society of Japan, 1995Co-Authors: Takeshi InaokaAbstract:We investigate the ground-state electronic structure of small spherical Metal Shells on the basis of a model system which consists of valence electrons and a spherical jellium shell (JS). The electron density distribution and the effective one-particle potential are calculated by using the local-density-functional formalism involving the self-interaction correction (SIC). By varying the electron number and the inner radius of the JS, conserving the charge neutrality of the whole system, we closely examine how the electronic structure evolves from a jellium-sphere system to an electron system sharply localized around a spherical surface. By comparing the results in the SIC scheme with those in the ordinary Kohn-Sham scheme, we explore effects of the SIC especially on energy levels of occupied electron Shells and on the total energy.
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Characteristics of Electronic Structure of Small Spherical Metal Shells
Journal of the Physical Society of Japan, 1994Co-Authors: Takeshi InaokaAbstract:The ground-state electronic structure of a small spherical Metal shell is investigated on the basis of the model system composed of valence electrons and a spherical jellium shell (JS). The electron density distribution and the effective one-particle potential are calculated by means of the density functional theory involving the local density approximation. We follow the evolution of the electronic structure as we vary the electron number and the inside radius of the JS, conserving the charge neutrality as a whole. The results of our calculation highlight the characteristics of the electronic structure of the small spherical Metal shell, which can be understood in terms of the transition from the electronic structure of the Metal sphere to that of the electron system sharply localized around a spherical surface.
Xinhui Xia - One of the best experts on this subject based on the ideXlab platform.
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oxide nanostructures hyperbranched with thin and hollow Metal Shells for high performance nanostructured battery electrodes
Small, 2014Co-Authors: Xinhui Xia, Qinqin Xiong, Yongqi Zhang, Hong Jin FanAbstract:High-performance electrochemical energy storage (EES) devices require the ability to modify and assemble electrode materials with superior reactivity and structural stability. The fabrication of different oxide/Metal core-branch nanoarrays with adjustable components and morphologies (e.g., nanowire and nanoflake) is reported on different conductive substrates. Hollow Metal branches (or Shells) wrapped around oxide cores are realized by electrodeposition using ZnO nanorods as a sacrificial template. In battery electrode application, the thin hollow Metal branches can provide a mechanical protection of the oxide core and a highly conductive path for charges. As a demonstration, arrays of Co3O4/Ni core-branch nanowires are evaluated as the anode for lithium ion batteries. The thin Metal branches evidently improve the electrochemical performance with higher specific capacity, rate capability, and capacity retention than the unmodified Co3O4 counterparts.
Haorong Wang - One of the best experts on this subject based on the ideXlab platform.
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silica Metal core Shells and Metal Shells synthesized by porphyrin assisted photocatalysis
Chemistry of Materials, 2008Co-Authors: Haorong Wang, Yujiang Song, Craig J Medforth, Zhongchun Wang, James E Miller, Lindsey R Evans, J.a. ShelnuttAbstract:Uniform silica beads modified with a positively charged tin porphyrin (SnT(NMe4Py)P) adsorbed onto their surface are used as photocatalytically active templates to synthesize platinum and palladium shell and core−shell nanostructures. The cationic porphyrin SnT(NMe4Py)P serves a dual function, acting as both a photocatalyst to reduce Metal ions and nucleate growth sites and as a surface modifier that promotes binding of platinum Metal to the surface of the nanospheres. Hollow platinum nanoShells can then be produced by removing the silica cores using hydrofluoric acid. Magnetic silica−platinum core−shell spheres can also be prepared starting from silica spheres containing magnetite nanoparticles. The silica−porphyrin−platinum nanocomposites contain all the components necessary to produce hydrogen gas via a tin porphyrin-mediated reductive photocatalytic process using a sacrificial electron donor. However, due to instability of the SnT(NMe4Py)P, hydrogen production can only be realized when a degradation-r...
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Interfacial Synthesis of Dendritic Platinum NanoShells Templated on Benzene Nanodroplets Stabilized in Water by a Photocatalytic Lipoporphyrin
Journal of the American Chemical Society, 2006Co-Authors: Haorong Wang, Yujiang Song, Craig J Medforth, J.a. ShelnuttAbstract:Nanoscale Metal Shells have many potential uses and in some applications offer significant advantages over nanoparticles. The synthesis of platinum nanoShells using stabilized nanodroplets of benzene in water as growth templates is described; the nanodroplets are stabilized by a surfactant-like tin(IV)−porphyrin complex localized at the benzene−water interface. The porphyrin also acts as a photocatalyst that reduces the platinum complex and deposits Metal onto the nanodroplets to form dendritic Metal nanoShells. Below the solubility limit of benzene in water, the lipoporphyrin-stabilized nanodroplets have a reproducible number, size distribution, and surface area, which allows the thickness of the platinum shell walls to be controlled by changing the amount of platinum complex. Nanoscale platinum Shells with magnetic interiors can be made by dispersing Fe3O4 nanoparticles in the benzene nanodroplets.
F. S. Haddad - One of the best experts on this subject based on the ideXlab platform.
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Reconstruction of failed acetabular component in the presence of severe acetabular bone loss: a systematic review
MUSCULOSKELETAL SURGERY, 2019Co-Authors: A. Volpin, S. Konan, R. J. Tansey, F. S. HaddadAbstract:Acetabular revision especially in the presence of severe bone loss is challenging. There is a paucity of literature critiquing contemporary techniques of revision acetabular reconstruction and their outcomes. The purpose of this study was to systematically review the literature and to report clinical outcomes and survival of contemporary acetabular revision arthroplasty techniques (tantalum Metal Shells, uncemented revision jumbo Shells, reinforced cages and rings, oblong Shells and custom-made triflange constructs). Full-text papers and those with an abstract in English published from January 2001 to January 2016 were identified through international databases. A total of 50 papers of level IV scientific evidence, comprising 2811 hips in total, fulfilled the inclusion criteria and were included. Overall, patients had improved outcomes irrespective of the technique of reconstruction as documented by postoperative hip scores. Our pooled analysis suggests that oblong cups components had a lower failure rate compared with other different materials considered in this review. Custom-made triflange cups had one of highest failure rates. However, this may reflect the complexity of revisions and severity of bone loss. The most common postoperative complication reported in all groups was dislocation. This review confirms successful acetabular reconstructions using diverse techniques depending on the type of bone loss and highlights key features and outcomes of different techniques. In particular, oblong cups and tantalum Shells have successful survivorship.