A5038542999- Intermetallics and Advanced Alloy Properties
- Catalytic Processes in Materials Science
- Microstructure and mechanical properties
- Aluminum Alloy Microstructure Properties
- Advanced Materials Characterization Techniques
- Quasicrystal Structures and Properties
- Metal and Thin Film Mechanics
- Semiconductor materials and devices
- Semiconductor materials and interfaces
- Aluminum Alloys Composites Properties
- Catalysis and Oxidation Reactions
- Additive Manufacturing Materials and Processes
- Advanced materials and composites
- Electrocatalysts for Energy Conversion
- Titanium Alloys Microstructure and Properties
- Physics of Superconductivity and Magnetism
- High-Temperature Coating Behaviors
- Advanced ceramic materials synthesis
- High Temperature Alloys and Creep
- Electronic and Structural Properties of Oxides
- Chalcogenide Semiconductor Thin Films
- Ferroelectric and Piezoelectric Materials
- Microstructure and Mechanical Properties of Steels
- Metallic Glasses and Amorphous Alloys
- Quantum Dots Synthesis And Properties
University of Connecticut
2015-2024
London Rebuilding Society
2015-2020
Universidad Cristiana Autónoma de Nicaragua
2009
Brookhaven National Laboratory
2006
University of Birmingham
1993-2003
Chinese Academy of Sciences
1994-1995
The Ohio State University
1989-1993
University of Liverpool
1987-1991
Olin Corporation (United States)
1990
Case Western Reserve University
1989-1990
ZnO materials with a range of different morphologies have been synthesized via simple solvothermal method solvents. Zinc acetylacetonate was used as the zinc source in such syntheses for first time. XRD data showed that single-phase wurtzite crystal structure obtained all solvents used. FE-SEM imaging cauliflower-like, truncated hexagonal conical, tubular and rodlike, hourglass-like, nanorods, spherical shapes were produced when THF, decane, water, toluene, ethanol, acetone solvent,...
Cryptomelane-type K-OMS-2 nanomaterials with high surface area (156 m2/g) have been synthesized via a low-temperature solvent-free method in very short time (1 h). Field emission scanning electron microscopy and high-resolution transmission images reveal that these materials nanorod morphologies average diameters of about 10 nm lengths 50 nm. These are different from the long fiberous OMS-2 made by conventional reflux or hydrothermal methods. X-ray diffraction Brunauer−Emmett−Teller studies...
Abstract Highly uniform single‐crystal Na‐OMS‐2 (OMS: octahedral molecular sieve), pyrolusite, and γ‐MnO 2 nanostructures with an interesting 3D urchinlike morphology have been successfully prepared using a hydrothermal method based on mild direct reaction between sodium dichromate manganese sulfate. The crystal phases, shapes, tunnel sizes of the dioxide can be tailored. Reaction temperature, concentrations reactants, acidity solution play important roles in controlling synthesis these...
Abstract Novel three‐dimensional (3D) hierarchical nanoarchitectures of ϵ‐MnO 2 have been synthesized by a simple chemical route without the addition any surfactants or organic templates. The self‐organized crystals consist major dipyramidal single crystal axis and six secondary branches, which are arrays single‐crystal nanobelts. growth directions nanobelts perpendicular to central axis, shows sixfold symmetry. shape assembly can be controlled reaction temperature. morphology changes from...
The MnO(100) facets with higher adsorption energy of O species can largely promote the electrocatalytic activity.
Manganese oxide octahedral molecular sieves with increasing nanoscale tunnel sizes are systematically synthesized using hydrothermal treatment of Na-birnessite under pH conditions. OMS-5 (2×4), OMS-6 (2×3), and OMS-7 (1×1; see Figure) structures have been at values 13, 7.0, 1.0, respectively.
Ti-6Al-4V powder has been recycled 30 times in an electron beam melting system. A combination of microscopy techniques used to show that the a 35% higher oxygen content, and particles have more irregular morphology, narrower particle size distribution, much variable microstructure than virgin powder. The microstructures vary from martensitic α′ structure, which is identical powder, two-phase α + β structure. This variability related complex thermal history unmelted metal Despite these...
Four alkali cations (Li+, Na+, K+, and Rb+) ammonium (NH4+), have been successfully used as templates for the synthesis of cryptomelane-type manganese oxide octahedral molecular sieves (A−OMS-2, A = template cation). H−OMS-2 material has prepared by calcination NH4−OMS-2. These A−OMS-2 materials characterized X-ray diffraction, transmission electron microscopy, high-resolution scanning thermogravimetric analysis, temperature-programmed desorption, inductively coupled plasma BET surface area...
Platinum/carbon aerogel (Pt/CA) nanocomposites were synthesized using a supercritical deposition method. Dimethyl(1,5-cyclooctadiene)platinum (II) (CODPtMe2) was dissolved in CO2 (scCO2) and impregnated into porous organic carbon aerogels. The aerogels converted to Pt/CA composites by heat treatment ranging from 300 1000 °C the presence of nitrogen gas. Both conventional high-resolution TEM micrographs showed good distribution fairly monodisperse Pt particles throughout bulk all supports...
Supported nanoparticles of platinum on a wide variety substrates, including carbon aerogel, black, silica silica, γ-alumina, and Nafion 112 film, were synthesized via supercritical fluid route. The porous substrates film impregnated with an organometallic precursor, dimethyl(1,5-cyclooctadiene)platinum(II) (PtMe2COD), from dioxide (scCO2) solution at 80 °C 27.6 MPa. After depressurization, the precursor was reduced to elemental by heat treatment in presence nitrogen gas. resulting...