A5050932918- Inorganic Fluorides and Related Compounds
- Crystal Structures and Properties
- X-ray Diffraction in Crystallography
- Catalysis and Oxidation Reactions
- Crystallization and Solubility Studies
- Quantum Dots Synthesis And Properties
- Inorganic Chemistry and Materials
- Polyoxometalates: Synthesis and Applications
- Metal-Organic Frameworks: Synthesis and Applications
- Crystallography and molecular interactions
- Advancements in Battery Materials
- Advanced Condensed Matter Physics
- Silicone and Siloxane Chemistry
- Supercapacitor Materials and Fabrication
- 2D Materials and Applications
- Chalcogenide Semiconductor Thin Films
- Advanced battery technologies research
- Electron and X-Ray Spectroscopy Techniques
- Advanced biosensing and bioanalysis techniques
- Electrophoretic Deposition in Materials Science
- Electrodeposition and Electroless Coatings
- Lanthanide and Transition Metal Complexes
- Supramolecular Self-Assembly in Materials
- Advanced materials and composites
- Transition Metal Oxide Nanomaterials
Exponent (United States)
2019
United States Naval Research Laboratory
2015-2018
United States Navy
2015-2017
Science and Technology on Surface Physics and Chemistry Laboratory
2015-2016
Naval Research Laboratory Chemistry Division
2015-2016
National Academies of Sciences, Engineering, and Medicine
2016
Northwest University
2012-2015
National Postdoctoral Association
2015
University of Colorado Boulder
2015
Northwestern University
2009-2014
This paper describes a quantitative analysis of the chemical composition organic/inorganic interfaces colloidal 3.1-nm CdSe quantum dots (QDs) synthesized with trioctylphosphine oxide (TOPO) as coordinating solvent and purified by successive precipitations from chloroform/methanol solvent/nonsolvent system. A combination X-ray photoelectron spectroscopy, inductively coupled plasma-atomic emission NMR (both 1H 31P) reveals that only ligands form stable population on surface QDs are X-type...
A methodology for the design of polar, inorganic structures is demonstrated here with packing lambda (Λ)-shaped basic building units (BBUs). Noncentrosymmetric (NCS) solids interesting physical properties can be created BBUs that lack an inversion center and are likely to pack into a polar configuration; previous methods construct these have used NCS octahedra as BBUs. Using this synthesize solids, one must increase coordination maintenance noncentrosymmetry bulk. The first step in...
For a crystal to exhibit nonlinear optical (NLO) activity such as second-harmonic generation (SHG), it must belong noncentrosymmetric (NCS) space group. Moreover, for these materials be suitable practical uses, the synthesized crystals should phase-matchable (PM). Previous synthetic research into SHG-active has centered on (i) how create NCS compounds and/or (ii) obtain with high SHG efficiencies. With tactics, one can synthesize material efficiency, but could unusable if was...
This paper describes the use of 1H NMR spectroscopy to measure equilibrium constants for solution-phase binding two para-substituted aniline molecules (R-An), p-methoxyaniline (MeO-An) and p-bromoaniline (Br-An), colloidal 4.1 nm CdSe quantum dots (QDs). Changes in chemical shifts aromatic protons located ortho amine group on R-An were used construct a isotherm each R-An/QD system. These isotherms fit Langmuir function yield Ka, constant ligands QDs; Ka ≈ 150 M−1 ΔGads −19 kJ/mol both R =...
The syntheses of two noncentrosymmetric (NCS) vanadium oxide–fluoride compounds that originate from the same synthetic reagent concentrations are presented. Hydrothermal and low-temperature allow isolation metastable products may form new phases (or decompose) upon heating creation chemically similar but structurally different materials. NCS materials synthesis has been a long-standing goal in inorganic chemistry: this article, we compare materials, NaVOF4(H2O) (I) NaVO2–xF2+x (II; x = 1/3)....
In this study, we describe the crystallization of specific niobium oxide–fluoride anions (either [NbOF4]− or [NbOF5]2–) by increasing fluoride concentration with appropriate use organic bases varied corresponding pKa values to create suitable equilibria for formation each anion. HpyNbOF4 (I; py = pyridine) contains anion, while [H2(4,4′-bpy)]NbOF5] (II; 4,4′-bpy 4,4′-bipyridyl) [NbOF5]2– anion; their identity is correlated reagent ratios. The increase basic species (proton acceptors) results...
We present structural and electrochemical analyses of a new double-wolframite compound: AgNa(VO2F2)2 or SSVOF. SSVOF is fully ordered displays characteristics that give insight into electrode design for energy storage beyond lithium-ion chemistries. The compound contains trioxovanadium fluoride octahedra combine to form one-dimensional chain-like basic building units, characteristic wolframite (NaWO4). 1D chains are stacked create 2D layers; the cations Ag+ Na+ lie between these layers....
Defective VFe<sub>2</sub>O<sub>x</sub> aerogels are synthesized to maximize cation vacancies that increase Li<sup>+</sup>- and Na<sup>+</sup>-insertion capacity.
The controlled crystallization of specific tantalum oxide-fluoride and fluoride anions ([TaOF5]2–, [TaF6]−, [TaF7]2–) is demonstrated using organic reagents with varied corresponding pKa values in the presence aqueous hydrofluoric acid. identity or [TaOF5]2–, [TaF7]2– are shown to crystallize successively from solution solid state by increasing reagents, which lead subsequent increase concentration acid solution. With use this methodology, three new hybrid crystal structures were targeted:...
Abstract The potassium vanadium oxide‐fluoride phase β‐KVOF 3 was prepared by in‐situ reduction with hydrothermal methods and characterized single‐crystal X‐ray diffraction magnetic susceptibility measurements. compound is orthorhombic [space group Pnma , a = 7.1596(2) Å, b 7.5392(2) c 13.0506(4) Z 8]. material structurally similar isoformulaic to d 1 materials of formulae A VOF ( + alkali metal, ammonium, or organic cation). Magnetic data were successfully fit Heisenberg chain model....
A series of pseudosymmetrical structures formula K10(M2OnF11-n)3X (M = V and Nb, n 2, X (F2Cl)1/3, Br, Br4/2,I4/2; M Mo, 4, Cl, Br4/2, I4/2) illustrates generation polar with the use Λ-shaped basic building units (BBUs). For a compound to belong space group, dipole moments individual species must be partially aligned. Incorporation d(0) early transition metal polyhedral BBUs into is common method create structures, owing second-order Jahn-Teller distortion these polyhedra contain. Less...
The self-assembly of CdSe quantum dots (QDs) onto a patterned silica surface generated from microcontact click printing is presented. mechanically robust process produces patterns QDs which remain steadfast, even as subsequent reactions are performed on the substrate, demonstrating utility and ease this process.
A unique possibility for a simple strain tolerant inorganic solid is envisioned whereby set of isolated, one-dimensional (1D) nano objects are embedded in an elastically soft three-dimensional (3D) atomic matrix thus forming interdimensional hybrid structure (IDHS). We predict theoretically that the concerted rotation 1D could allow such IDHSs to tolerate large values with impunity. Searching among 1:1:1 ABX compounds I-I-VI composition, we identified, via first-principles thermodynamic...
By applying differential pair distribution function analyses to MnO<sub>x</sub>-painted carbon nanofoam papers, we quantify the manganese oxide speciation as nanoscale transitions from disordered NaMnO<sub>x</sub>to spinel LiMn<sub>2</sub>O<sub>4</sub>.
Abstract Three new vanadium oxide‐fluoride phases, Na 2 (M(H O) )(V O 4 F 6 ) (M = Co 2+ , Ni and Cu ), were prepared by hydrothermal techniques in hydrofluoric acid. The compounds contain the dioxo fluoride dimeric anion: [V ] 4– . harder (Na + softer cations coordinate to oxide anions, respectively. In contrast monoxo fluorides, exhibits an increased nucleophilicity of anions. This allows anion bond covalently with late transition metals form 2D layers that both early metal (V 5+ a (Co or ).
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTGram-Scale, Low Temperature, Sonochemical Synthesis of Stable Amorphous Ti–B Powders Containing HydrogenZachary J. Huba†, Martin D. Donakowski†, and Albert Epshteyn‡*View Author Information Chemistry Division, U.S. Naval Research Laboratory, Washington, D.C. 20375, United States*(A.E.) E-mail: [email protected]Cite this: Chem. Mater. 2017, 29, 4, 1467–1471Publication Date (Web):February 10, 2017Publication History Received1 February...
Protocols that express functional materials in a way amplifies their surface-to-volume ratio offer means to probe the structural ambiguity and surface-mediated reactivity of technologically important materials. We previously reported three-dimensional (3D) ultraporous scaffolds, such as silica aerogels, fiber paper, carbon nanofoam paper (CNF), provide form factor expresses energy-storing, catalytic ruthenium oxide (RuOx) essentially all-surface—and highly disordered one at that. To track...
Abstract β‐KVOF 3 is prepared by in‐situ reduction under hydrothermal conditions using a mixture of V 2 O 5 and KBr (3:2) in aq.
Abstract Compounds (II) and (III) are formed by adjusting the acidity of solution using different organic bases.
The deposition of continuous, ultrathin, conductive films from liquid-phase is still a rare processing outcome. We have demonstrated that RuO 2 can be deposited chilled, nonaqueous solutions 4 as an ~10 nm–thick film on planar substrates using scalable, atom-efficient, self-limiting synthetic protocol [1]. versatility this exemplified in ensues any type substrate—metal, semiconductor, ceramic, polymer, or salt—or whether the substrate planar, curved, non-line-of-sight [1–3]. resulting air-...