Materials Literature
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The structure of a new layered oxyfluoride, viz. potassium strontium diniobium hexaoxide fluoride, KSrNb(2)O(6)F, was refined from powder neutron diffraction data in the orthorhombic space group Immm. The oxyfluoride compound is an n = 2 member of the Dion-Jacobson-type family of general formula A[A'(n-1)B(n)X(3n+1)],…
Abstract The use of chromate baths is being progressively restricted owing to the high toxicity of the hexavalent chromium (Cr6+) compounds. In this work, chemical conversion coating on AZ31 (3% Al, 1% Zn) magnesium alloy was performed by immersion in 5 mM Ce(NO3)3 solution with and without addition of Al(NO3)3 and Ca…
Abstract Pillared carbons containing silica between their carbon layers were first prepared by the pyrolysis of graphite oxide silylated by 3-aminopropyldiethoxymethylsilane between 450 and 550 °C under vacuum. They possessed both microporosities and mesoporosities existing between their carbon layers.
Cationic porphyrins have an affinity for DNA and potential for applications in the fields of photodynamic therapy and cellular imaging. This report describes a new dicationic porphyrin, 5,15-dimethyl-10,20-di(N-methylpyridinium-4-yl)porphyrin, abbreviated H2tMe2D4. Although tetrasubstituted, H2tMe2D4 presents modest s…
meso-Pyrimidinyl-substituted A2B-corroles were synthesized in good yields by condensation of 5-mesityldipyrromethane and 2-substituted 4,6-dichloropyrimidine-5-carbaldehydes. A simple reduction of the amount of Lewis acid (BF3.OEt2) resulted in the formation of A2B-corroles, which was optimized to maximize the corrole…
Monolayers of spherical-domain block copolymer, exhibiting hexagonal symmetry with a (10) periodicity of 25 nm, are laterally confined in hexagonal wells 12 μm wide and 26 nm deep that span the entire area of a two-inch diameter silicon wafer. The structure is characterized with grazing-incidence small-angle X-ray dif…
A bisnaphthyl azadiene derivative (L) demonstrates Hg2+-selective intermolecular excimer emission. This emission is responsive to the number of coordinated Hg2+ atoms, where 2:2 and 2:3 L-Hg2+ complexes are the strongly emissive components, whereas the 2:1 complex is nonemissive.
Purpose The paper seeks to evaluate and present the usability of one pattern customising technology in the achievement and testing of garment fit. Design/methodology/approach This study focuses on the use of 3D technology in the testing of garment fit. It examines the usability of one pattern customising technology in…
Tapes japonica lysozyme (TJL) is classified as a member of the recently established i-type lysozyme family. In this study, we solved the crystal structure of TJL complexed with a trimer of N-acetylglucosamine to 1.6A resolution. Based on structure and mutation analyses, we demonstrated that Glu-18 and Asp-30 are the c…
The in vitro rate of degradation was purposely affected by covalently grafting the surface of poly(l-lactide) (PLLA). PLLA films were surface modified by our vapor-phase nondestructive photografting technique. Films were grafted for 20 min with one of the following monomers: acryl amide (AAm), N-vinyl pyrrolidone (VP)…
Reactions of the Schiff base oligopyrrolic octaazamacrocycle 1 with BF4- salts of divalent zinc and cadmium result in fluoride anion abstraction and the formation of difluoride-bridged metal complexes. X-ray diffraction analyses provide support for the notion that hydrogen-bonding interactions, involving the N-H group…
Boron azadipyrromethenes are red-light-absorbing dyes with chromophoric capabilities deriving from a conjugated, chelating framework. Reported here are tricoordinate copper(I), silver(I), and gold(I) complexes of a tetraphenylazadipyrromethene ligand. The new complexes are characterized by optical absorption and emiss…
Avidin-modified polyaniline (PANI) electrochemically deposited onto a Pt disk electrode has been utilized for direct detection of Escherichia coli by immobilizing a 5'-biotin-labeled E. coli probe (BdE) using a differential pulse voltammetric technique in the presence of methylene blue as a DNA hybridization indicator…
The electrical conductivity behavior of highly crystallized undoped hydrogenated microcrystalline silicon films having different microstructures was studied. The dark conductivity is seen to follow Meyer Neldel rule (MNR) in some films and anti MNR in others, depending on the details of microstructural attributes and…
We investigated the unoccupied part of the electronic structure of the oxygen-deficient hafnium oxide (HfO$_{\sim1.8}$) using soft x-ray absorption spectroscopy at O $K$ and Hf $N_3$ edges. Band-tail states beneath the unoccupied Hf 5$d$ band are observed in the O $K$-edge spectra; combined with ultraviolet photoemiss…
Divacancies are among the most important defects that alter the charge transport properties of single-walled carbon nanotubes (SWNT), and we here study, using ab initio calculations, their properties. Two structures were investigated, one that has two pentagons side by side with an octagon (585) and another composed o…
In a well-dispersed nanofluid with strong cluster-fluid attraction, thermal conduction paths can arise through percolating amorphous-like interfacial structures. This results in a thermal conductivity enhancement beyond the Maxwell limit of 3*phi, with phi being the nanoparticle volume fraction. Our findings from non-…
A large measured 2D diffusion coefficient of gold nanoclusters on graphite has been known experimentally and theoretically for about a decade. When subjected to a lateral force, these clusters should slide with an amount of friction that could be measured. We examine the hypothetical possibility to measure by Quartz C…
Iron oxide nanotubes of 50−150 nm outer diameter and 2−20 nm wall thickness are prepared in ordered arrays. Atomic layer deposition (ALD) of Fe 2 O 3 from the precursor iron(III) tert -butoxide at 130−180 °C yields very smooth coverage of the pore walls of anodic alumina templates, with thickness growth of 0.26(±0.04)…
A tensonometer for stretching metal foils has been constructed for the study of strain broadening in X-ray diffraction line profiles. This device, which is designed for use on powder diffractometers and was tested on Station 2.3 at Daresbury Laboratory, allows in situ measurements to be performed on samples under stre…