Graphene oxide film as a template for the creation of
Xia Y and Mokaya R Hollow spheres of crystalline porous metal oxides a generalized synthesis route via nanocasting with mesoporous carbon hollow shells J Mater Chem 15 3126 2005 ossRef Google Scholar
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Selective fabrication of porous iron oxides hollow spheres
Porous hematite α Fe 2 O 3 hollow spheres and nanofibers could be obtained via electrospinning and subsequent thermal decomposition in air The precursor could be fabricated by electrospinning using Fe NO 3 3 as the iron source and Polyvinylpyrrolidone PVP as a complexing reagent Upon calcination pure porous α Fe 2 O 3 hollow spheres and nanofibers could be obtained
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Synthesis of hollow porous nanospheres of hydroxyl
TEM characterization provided further insight into the structures and confirmed that the spheres were hollow and porous The low magnification TEM image shows a few representative particles and Fig 6 d shows a close up view The shell had a thickness of ∼20 nm and was made up of nanocrystals ranging from ∼10 to 20 nm as building subunits
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Surfactant free synthesis of Cu 2 O hollow spheres and
A facile synthesis route of cuprous oxide Cu2O hollow spheres under different temperatures without the aid of a surfactant was introduced Morphology and structure varied as functions of reaction temperature and duration A bubble template mediated formation mechanism was proposed which explained the reason of morphology changing with reaction temperature
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General Synthesis of Mesoporous Spheres of Metal Oxides
Hollow spheres of crystalline porous metal oxides A generalized synthesis route via nanocasting with mesoporous carbon hollow shells Journal of Materials Chemistry 2005 15 3126 DOI 10 1039/b502558c Jisuk Kim Mijung Noh Jaephil Cho HyunMi Kim Ki Bum Kim
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A facile route to synthesize multiporous MnCo 2 O 4 and
A facile and general way for the synthesis of porous and hollow complex oxides is highly desirable owing to their significant applications for energy storage and other fields In this contribution uniform Mn 0 33 Co 0 67 CO 3 and Co 0 33 Mn 0 67 CO 3 microspheres are firstly fabricated solvothermally just by tuning the molar ratio of Mn and Co
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Thermal Oxidation Strategy towards Porous Metal Oxide
High‐porosity hollow doughnut‐shaped and spherical CuO structures are synthesized by thermal oxidation of the corresponding CuS and Cu 2 S precursors respectively A combination of non‐equilibrium interdiffusion volume loss and gas release are proposed to explain the formation of these porous hollow architectures
Get PriceHighly porous metal organic framework derived NiO hollow
In addition the outer surfaces of these hollow spheres were porous that is not smooth The decomposition of organic linkers followed by rearrangement of metal oxide ions during pyrolysis resulted in formation of hollow structures while the porous structure was resulted due to gas molecules produced during pyrolysis process 19 20 Such a special structure will be beneficial for better utilization of
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USA1Porous metal oxide particles and their
Methods are generally disclosed for synthesis of porous particles from a solution formed from a leaving agent a surfactant and a soluble metal salt in a solvent The surfactant congregates to form a nanoparticle core such that the metal salt forms about the nanoparticle core to form a plurality of nanoparticles The solution is heated such that the leaving agent forms gas bubbles in the
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Fabrication of Porous TiO 2 Hollow Spheres and Their
In this work porous TiO 2 hollow spheres with an average diameter of 100 nm and shell thickness of 20 nm were synthesized by a facile hydrothermal method with NH 4 HCO 3 as the structure directing agent and the formation mechanism for this porous hollow structure was proved to be the Ostwald ripening process by tracking the morphology of the products at different reaction stages
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Porous Crystalline Covalent Organic Frameworks Science
Covalent organic frameworks COFs have been designed and successfully synthesized by condensation reactions of phenyl diboronic acid C6H4 B OH 2 2 and hexahydroxytriphenylene C18H6 OH 6 Powder x ray diffraction studies of the highly crystalline products C3H2BO 6 C9H12 1 COF 1 and C9H4BO2 COF 5 revealed expanded porous graphitic layers that are either staggered
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Thermal Oxidation Strategy towards Porous Metal Oxide
Porous metal oxide hollow architectures are achieved High‐porosity hollow doughnut‐shaped and spherical CuO structures are synthesized by thermal oxidation of the corresponding CuS and Cu 2 S precursors respectively A combination of non‐equilibrium interdiffusion volume loss and gas release are proposed to explain the formation of
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Hydrothermal Treatment of Tannin A Route to Porous Metal
Titirici et al also obtained hollow crystalline iron oxide spheres with diameters of 1 µm for which both the surface area and the thickness of the shell could be varied depending on the experimental ratio carbohydrate/metal salt
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Synthesis and Applications of Hollow Particles
Fig 3 showed the hollow porous shells of crystalline CaCO 3 prepared by using micrometer sized PS beads as the templates 42 Monodisperse PS spheres with a uniform diameter of 1 09 μ m were covered by a film of microemulsions which contained tetradecane and supersaturated aqueous calcium bicarbonate Ca HCO 3 2 solution and washed
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Functional Porous Materials ChemistryYu2020
Porous metals metal oxides or carbons can be made as electrocatalysts for important reactions such as hydrogen evolution and oxygen reduction article number zeolites MOFs COFs and mesoporous nanomaterials can be used to construct electronic devices such as capacitors conductors and electrodes in batteries and fuel cells article numbers and
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Porous and Low Crystalline Manganese Silicate Hollow
Herein a graphene oxide GO wired manganese silicate MS hollow sphere MS/GO composite is successfully synthesized Such an architecture possesses multiple advantages in lithium and sodium storage The hollow MS structure provides sufficient free space for volume variation accommodation the porous and low crystalline features facilitate the diffusion of lithium ions
Get PriceGeneral Synthesis of Mixed Semiconducting Metal Oxide
Metal oxide hollow spheres MOHSs with multicomponent metal elements exhibit intriguing properties due to the synergistic effects of different components However it remains a great challenge to develop a general method to synthesize multicomponent MOHSs due to the different hydrolysis and condens
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Fabrication of hollow spheres of metal oxide using
Hollow spheres of a series of crystalline metal oxides α Fe2O3 Cr2O3 Co3O4 NiO and ZnO have been fabricated utilizing the metal chloride as the oxide precursors Heating of an aqueous solution of the metal chloride and fructose to moderate temperature in an autoclave affords a spherical composite consisting of a metal precursor shell sheathing a carbonaceous core
Get PriceControllable Synthesis of Pure Phase Rare Earth
Hollow Spheres with a Porous Shell and Their Catalytic Performance heating the corresponding metal oxides in 1 1 stoichio metric ratio at high temperature 8 However crystalline LnFeO 3 prepared via these methods is too small to prevent corrosion or aggregation during high
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Mixed Metal Oxides DOI 10 1002/anie Self Templated Formation of Uniform NiCo 2 O 4 Hollow Spheres with Complex Interior Structures for Lithium Ion Batteries and Supercapacitors Laifa Shen Le Yu Xin Yao Yu Xiaogang Zhang and Xiong Wen David Lou
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Encapsulating soluble active species into hollow
In this respect metal–organic frameworks MOFs a class of crystalline porous materials assembled by metal ions and organic linkers are ideal candidates The high porosity of MOFs facilitates access to confined active species and rapid mass transport Their well defined and tunable pores would impart the size selective catalysis
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Porous cerium dioxide hollow spheres and their
recently ceria with hollow a structure has been fabricated by various methods 13 16 Thin layers ca 12 nm of cerium oxide were deposited onto ca 200 nm thick silica colloid templates using cerium nitrate and the silica cores were subsequently removed to yield hollow spheres 17 Novel single crystalline like CeO 2 hollow nanocubes
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Self templated synthesis of uniform hollow spheres based
The mechanism of hollow spheres formation was studied using a detailed real time tracking method indicating that the formation of hollow spheres is the result of Ostwald ripening mechanism
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Synthesis and Applications of Hollow Particles
Fig 3 showed the hollow porous shells of crystalline CaCO 3 prepared by using micrometer sized PS beads as the templates 42 Monodisperse PS spheres with a uniform diameter of 1 09 μ m were covered by a film of microemulsions which contained tetradecane and supersaturated aqueous calcium bicarbonate Ca HCO 3 2 solution and washed
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Encapsulating soluble active species into hollow
Encapsulating soluble active species into hollow crystalline porous capsules beyond integration of homogeneous and heterogeneous National Science Review IF 16 693 Pub Date Guorui Cai Meili Ding Qianye Wu Hai Long Jiang
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Selective fabrication of porous iron oxides hollow spheres
Porous hematite α Fe2 O 3 hollow spheres and nanofibers could be obtained via electrospinning and subsequent thermal decomposition in air The precursor could be fabricated by electrospinning using Fe NO3 3 as the iron source and Polyvinylpyrrolidone PVP as a
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Hollow spheres of crystalline porous metal oxides A
Hollow spheres and shells of crystalline porous metal oxides have been nanocast using hollow spheres of mesoporous carbon as hard template The metal oxides are fabricated from alkoxide precursors within the pore channels of the carbon templates Remarkably only one infiltration cycle was required to introduce metal alkoxide molecular
Get PriceFabrication of hollow spheres of metal oxide using
Abstract In this report fructose derived carbonaceous spheres were utilized as sacial templates for the fabrication of metal oxide hollow spheres MOHSs by a facile hydrothermal approach Hollow spheres of a series of crystalline metal oxides α Fe2O3 Cr2O3 Co3O4 NiO and ZnO have been fabricated utilizing the metal chloride as the oxide precursors
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MOF‑directed templating synthesis of a porous
porous NiCo 2 O 4 /NiO hollow dodecahedron using zeolitic imidazolate framework67 ZIF 67 as both precursor and self sacing template Accurate control between the template etching and crucial to the preparation of the perfect nanocages Serving as LIB anode materials such metal organic frameworks derived multiple transition metal oxides
Get PriceSynthesis of hollow cobalt oxide nanopowders by a
A new concept for preparing hollow metal oxide nanopowders by salt assisted spray pyrolysis applying nanoscale Kirkendall diffusion is introduced The composite powders of metal oxide and indecomposable metal salt are prepared by spray pyrolysis Post treatment under a reducing atmosphere and subsequent washing using distilled water produce aggregation free metal nanopowders
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metal oxides hollow submicrospheres via a hydrothermal approach 32 In this work we report the use of a facile route hydrothermal hydrolysis to fabricate porous crystalline metal oxides hollow spheres using glucose derived carbonaceous spheres as sacial templates and metal chlorides as precursors for the metal oxides In addition
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Hollow spheres of crystalline porous metal oxides nanocast by mesoporous carbon Yongde Xia and Robert Mokaya School of Chemistry University of
Get PriceA General Synthesis Strategy for Hierarchical Porous Metal
3 2 Synthesis of Metal Oxide Hollow Spheres Figures 4 a and 4 b show the SEM images of the carbon titania composite spheres before and after the thermal treatment at 450°C for 4 h and it can be seen that the coated carbon/TiO 2 composite spheres with monodispersed spherical shape were obtained indicating that the coating layer was uniform There was a clear contrast between the edge
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Controllable Fabrication and Optical Properties of Uniform
Xia Y Mokaya R Hollow spheres of crystalline porous metal oxides A generalized synthesis route via nanocasting with mesoporous carbon hollow shells J Mater
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The mechanism of hollow spheres formation was studied using a detailed real time tracking method indicating that the formation of hollow spheres is the result of Ostwald ripening mechanism
Get PriceUse of Carbonaceous Polysaccharide Microspheres as
Hollow spheres of a series of metal oxides SnO 2 Al 2 O 3 Ga 2 O 3 CoO NiO Mn 3 O 4 Cr 2 O 3 La 2 O 3 Y 2 O 3 Lu 2 O 3 CeO 2 TiO 2 and ZrO 2 have been prepared in this way The method involves the initial absorption of metal ions from solution into the functional surface layer of carbonaceous saccharide microspheres these are
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