A5034999898- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Anodic Oxide Films and Nanostructures
- Catalytic Processes in Materials Science
- Electronic and Structural Properties of Oxides
- Ferroelectric and Piezoelectric Materials
- Surface Modification and Superhydrophobicity
- Membrane Separation Technologies
- Mesoporous Materials and Catalysis
- Advanced Photocatalysis Techniques
- Radioactive element chemistry and processing
- Graphene research and applications
- Bone Tissue Engineering Materials
- TiO2 Photocatalysis and Solar Cells
- Nanocluster Synthesis and Applications
- Zeolite Catalysis and Synthesis
- Minerals Flotation and Separation Techniques
- Polymer Surface Interaction Studies
- Advancements in Solid Oxide Fuel Cells
- Copper-based nanomaterials and applications
- Semiconductor materials and devices
- Magnetic and transport properties of perovskites and related materials
- Microwave Dielectric Ceramics Synthesis
- Conducting polymers and applications
- Crystallization and Solubility Studies
Oak Ridge National Laboratory
2011-2020
National Transportation Research Center
2012-2019
University of Tennessee at Knoxville
2015
Knoxville College
2007-2011
Steacie Institute for Molecular Sciences
2009-2010
Defence Research and Development Canada
2010
Health Canada
2010
Institute for Microstructural Sciences
2009-2010
National Academies of Sciences, Engineering, and Medicine
2009-2010
State Key Laboratory on Integrated Optoelectronics
2010
The influence of particle size TiO2 on the photocatalytic degradation methylene blue (MB) in a suspended aqueous solution has been studied. results suggested that adsorption rate and adsorbability MB particles increased as sizes decreased. Photocatalytic activity also became smaller, especially when is less than 30 nm. half-life (t0.5) decreased first-order reaction constant for photodegradation initial model was higher fixed-bed model. This will overcome difficulty preparation ultrafine...
Pseudomonas aeruginosa strain CSU, a nongenetically engineered bacterial known to bind dissolved hexavalent uranium (as UO(2) (2+) and/or its cationic hydroxo complexes), was characterized with respect sorptive activity (equilibrium and dynamics). Living, heat-killed, permeabilized, unreconstituted lyophilized cells were all capable of binding uranium. The biosorption equilibrium could be described by the Langmuir isotherm. rate adsorption increased following permeabilization outer...
This paper reviews the experimental synthesis and engineering developments that focused on various green approaches large-scale process production routes for quantum dots. Fundamental principles were illustrated. In relation to small-scale hot injection method, our discussions focus non-injection route could be scaled up with stir-tank reactors. addition, applications demand utilize dots as "commodity" chemicals are discussed, including solar cells solid-state lightings.
Monodispersed ultrafine (nano‐ to micrometer) zirconia precursor powders were synthesized by three different physicochemical methods: (I) forced hydrolysis, (II) homogeneous precipitation in inorganic salt solutions, and (III) hydrolysis/condensation of alkoxide. The hydrolysis method produced monoclinic nanocrystalline particles (cube shaped) nanometer scale, which depended largely on the initial concentration. Methods II III, both involving use alcohol as a solvent, exhibited faster...
Pseudomonas aeruginosa CSU, a nongenetically engineered bacterial strain previously shown to bind dissolved hexavalent uranium (as UO22+ and/or its cationic hydroxy complexes), shows promise as the basis of an immobilized-cell process for removal from contaminated wastewaters. A number polymeric materials, including calcium alginate, polyacrylamide, polysulfone, and polyurethane, were evaluated possible immobilization matrices lyophilized biomass P. CSU. Polyurethane-based materials such...
High-quality colloidal photoluminescent CdS quantum dots (QDs) were synthesized via a noninjection one-pot approach in noncoordinating solvent 1-octadecene. This synthetic uses cadmium acetate dihydrate and elemental sulfur as Cd S sources, respectively, together with one long-chain fatty acid (CH3−(CH2)n−COOH) surface ligands 2,2′-dithiobisbenzothiazole (MBTS) to increase activity. The QDs at elevated temperatures such 240−300 °C, the kinetics of nucleation/growth was monitored temporal...
A concept for the fundamental science of nanoparticle synthesis, thermodynamic equilibrium-driven formation colloidal single-sized ensembles, is proposed and demonstrated in this manuscript, which addresses controlled CdSe magic-sized regular quantum dots (MSQDs RQDs). During formation, former are nuclei without further growth size, while latter experience nucleation growth. Both MSQDs RQDs exhibit bandgap emission, have homogeneous spectra broadening only both inhomogeneous broadening. The...
The oxygen permeation and stability of La0.2A0.8Co0.2Fe0.8O3-δ (A = Sr, Ba, Ca) perovskite-type membranes were studied at high temperatures low partial pressures. vacancy diffusivity concentration gradient calculated from the unsteady-state steady-state data for three decrease in order Sr > Ba Ca. activation energies increase < can be explained by average bond energy, free volume, critical radius materials. After exposure to air 1173 K 10 h, part La0.2Sr0.8Co0.2Fe0.8O3-δ transforms La2O3,...
An investigation show that the temperature-induced band gap (E(g)) variation of PbSe nanocrystals is strongly size-dependent. The temperature coefficients (dE(g)/dT) evolve from negative to zero and then positive values, with increase nanocrystal sizes. Such phenomena imply may be potential candidate as sensitive markers. Additional analyses disclose molar extinction remain unchanged in investigated range (25-120 degrees C).
Anodized TiO2 nanotubes have received much attention for their use in solar energy applications including water oxidation cells and hybrid [dye-sensitized (DSSCs) bulk heterojuntion (BHJs)]. High surface area allows increased dye-adsorption photon absorption. Titania grown by anodization of titanium fluoride-containing electrolytes are aligned perpendicular to the substrate surface, reducing electron diffusion path external circuit cells. The nanotube morphology can be optimized various...