Role of Electronic Structure in the Susceptibility of Metastable Transition‐Metal Oxide Structures to Transformation
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Doped spiral alumina nanowires
Spiral alumina nanowires, doped with Cr and Si, are directly and reliably produced in bulk quantities via annealing of high entropy alloys.
YfiT from Bacillus subtilis Is a Probable Metal-Dependent Hydrolase with an Unusual Four-Helix Bundle Topology,
YfiT, a 19-kDa polypeptide from Bacillus subtilis, belongs to a small sequence family with members predominantly from Gram positive bacteria. We have determined the crystal structure of YfiT in complex with Ni(2+) to a resolution of 1.7 A. YfiT exists as a dimer and binds Ni(2+) in a 1:1 stoichiometry. The protein has…
Structural Determination of the Principal Byproduct of the Lithium-Ammonia Reduction Method of Methamphetamine Manufacture
One common method of illicit methamphetamine manufacture utilizes an alkali metal, typically lithium, and liquid ammonia to chemically reduce ephedrine or pseudoephedrine to form methamphetamine. This method is often referred to as the lithium-ammonia reduction method or the Birch reduction method. While the hydroxyl…
A novel microporous copper silicate: Na 2 Cu 2 Si 4 O 11 ·2H 2 O
The synthesis and structural characterisation of a thermally stable novel three-dimensional microporous copper silicate open-framework are described; the material is capable of undergoing reversible zeolitic water removal without destruction of the framework.
Differential scanning calorimetry study on thermal behaviors of freeze‐dried poly(L‐lactide) from dilute solutions
Abstract Glass transition, cold crystallization, and melting of freeze‐dried poly(L‐lactide) (PLLA) prepared from dilute 1,4‐dioxane solutions were investigated by differential scanning calorimetry (DSC). Conventional DSC measurements of heating scans revealed that freeze‐dried PLLA prepared from a 0.07 wt % solution…
The formation of gigantic hollow silica spheres from an EO 76 –PO 29 –EO 76 /butanol/ethanol/H 2 O quaternary system
Gigantic hollow silica spheres with a hierarchical intra- and inter-particle porosity were obtained from an EO76–PO29–EO76/butanol/ethanol/H2O quaternary system, which is unique in its extremely rapid silica condensation and in the resulting hierarchical morphology.
Controlled Variation of Spacer Segment in Hyperbranched Polymers: From Densely Branched to Lightly Branched Systems
A series of hyperbranched polyethers containing different types (and lengths) of spacer segments that link the branch points were prepared by a solvent-free melt transetherification methodology. Three types of spacers, namely n -alkylene, cycloalkylene, and oxyethylene, were incorporated into the hyperbranched structu…
A general stability criterion for droplets on structured substrates
Wetting morphologies on solid substrates, which may be chemically or topographically structured, are studied theoretically by variation of the free energy which contains contributions from the substrate surface, the fluid–fluid interface and the three-phase contact line. The first variation of this free energy leads t…
Many-body effects in the electronic spectra of cubic boron nitride
We present state of the art first-principles calculations of optical spectra and the loss function of bulk cubic boron nitride $(c\text{\ensuremath{-}}\mathrm{B}\mathrm{N})$, starting from a density functional Kohn-Sham band structure. We investigate the influence of many-body effects beyond the random phase approxima…
Heterotrimeric Type I Collagen C-Telopeptide Conformation As Docked to Its Helix Receptor
The amino (N-telo) and carboxyl (C-telo) telopeptides of type I collagen play crucial roles, in vivo and in vitro, in the assembly of collagen fibrils, regulating the axial alignment of the molecules within a fibril, azimuthal orientations of neighboring molecules, and cross-link formation. High-resolution structures…
New Insights into the Structure of Poly(p-phenylene terephthalamide) from Neutron Fiber Diffraction Studies
ADVERTISEMENT RETURN TO ISSUEPREVNoteNew Insights into the Structure of Poly(p-phenylene terephthalamide) from Neutron Fiber Diffraction StudiesK. H. Gardner, A. D. English, and V. T. ForsythView Author Information DuPont Central Research and Development, Experimental Station, Wilmington, Delaware 19880; Department of…
Mechanical properties of cast Ti–Hf alloys
This study examined the mechanical properties of a series of Ti-Hf alloys. Titanium alloys with 10 to 40 mass % Hf were made with titanium and hafnium sponge in an argon-arc melting furnace. Specimens cast into magnesia-based investment molds were tested for yield strength, tensile strength, percentage elongation, and…
Self-Assembly of Supramolecules Consisting of Octyl Gallate Hydrogen Bonded to Polyisoprene-block-poly(vinylpyridine) Diblock Copolymers
Synchrotron radiation was used to investigate the self-assembly in two comb-shaped supramolecules systems consisting of octyl gallate (OG), i.e., 1-octyl-3,4,5-trihydroxybenzoate, hydrogen bonded to the pyridine groups of polyisoprene- block -poly(vinylpyridine) diblock copolymers. In the case of the 1,2-polyisoprene-…
Oscillations in Solvent Fraction of Polyelectrolyte Multilayers Driven by the Charge of the Terminating Layer
We have investigated polyelectrolyte multilayers of poly(styrene sulfonate) (PSS) and poly(allylamine hydrochloride) in contact with D2O by neutron reflectometry. The study particularly focuses on the changes in the solvent fraction of the system upon addition of a layer. When the layers are deposited at a low salt co…
Flame-made Pd/La2O3/Al2O3 nanoparticles: thermal stability and catalytic behavior in methane combustion
Palladium nanoparticles supported on lanthanum-stabilized alumina were prepared by flame spray pyrolysis. The as-prepared materials were characterized by high-resolution transmission electron microscopy, CO chemisorption, nitrogen adsorption, X-ray diffraction and temperature programmed reduction. These materials were…
Novel Micro/Nanoscale Hybrid Reinforcement: Multiwalled Carbon Nanotubes on SiC Particles
SiC particles are coated with multi-walled carbon nanotubes using a simple chemical vapor deposition process. This new type of micro/nanoscale hybrid reinforcement combines the characteristics of carbon nanotubes and the micrometer-sized SiC particles. Using this hybrid reinforcement in an epoxy composite produced a s…
Directed Synthesis of a 1D Double‐Chain Polyoxometalate Assembly: {[Ag2(bppy)3][Ag(bppy)2][Ag(bppy)]2PW11Co(bppy)O39}·2H2O
Abstract A 1D double‐chain assembly based on the monosubstituted Keggin polyoxometalate (POM) with pendant ligands and of formula {[Ag 2 (bppy) 3 ][Ag(bppy) 2 ][Ag(bppy)] 2 PW 11 Co(bppy)O 39 }·2H 2 O ( 1 ) [bppy = 5‐(4‐bromophenyl)‐2‐(4‐pyridinyl)pyridine] has been synthesised and characterised. The crystals of 1 bel…
Synthesis, structure and magnetism of a new ferromagnetic hexanuclear nickel cluster with a dicubane-like core
A new ferromagnetic nickel(II) hexameric structure based on the versatile N,O3-ligand 2,2',2"-nitrilotribenzoic acid has been prepared and characterised by X-ray crystallography and magnetic measurements; the compound represents a rare example of a nickel cluster with a dicubane-like core having only oxygen bridges.
Factors Governing Oxygen Reduction in Solid Oxide Fuel Cell Cathodes
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