Materials Literature
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Biodegradable aliphatic polyesters (BAPs), synthesized from diols and dicarboxylic acids, and organophilic montmorillonite (OMMT) were intercalated by a solvent-casting method using chloroform as a cosolvent to produce nanocomposite (BAP/OMMT). The d spacings of both BAP and BAP/OMMT were examined by X-ray diffraction…
New polylactide (PLA)/layered silicate nanocomposites have been prepared successfully by simple melt extrusion of PLA and organically modified montmorillonite. The d spacings of both the organically modified montmorillonite and intercalated nanocomposites were investigated by wide-angle X-ray diffraction (WAXD) analys…
The nucleation and growth of colloidal CdSe nanocrystals with a variety of elongated shapes were explored in detail. The critical size nuclei for the system were magic sized nanoclusters, which possessed a sharp and dominated absorption peak at 349 nm. The formation of the unique magic sized nuclei in a broad monomer…
Abstract Irradiation of aluminium covered by anodic oxide films 3–14 nm thick using 100 keV H + ions is shown to result in detachment of the oxide film. A dose of 6.6 × 10 16 H + ions cm −2 on a 6.5 nm thick film causes the removal of large pieces of oxide with dimensions at least 15 µm. Atomic force microscopy analys…
GaAs(100) layers grown by low-temperature (LT) molecular beam epitaxy were studied by means of valence-band and core-level photoelectron spectroscopy. Small differences were found between valence-band spectra from the LT layers and corresponding layers grown at high temperature. In the Ga $3d$ spectra a new component…
Abstract 2‐Bromo‐4‐nitropyridine N ‐oxide is orthorhombic, space group Pbca , with eight molecules per unit cell of dimensions a = 5.979(1), b = 9.899(1), c = 23.249(5) Å. The Br ion is nearly coplanar with the pyridine ring, while the two oxygen atoms of the nitro group are displaced above and below the ring by (−0.2…
The proton paramagnetic relaxation enhancement (PRE) in an aqueous solution of nickel(II) is described in terms of electron spin relaxation caused by damped vibrational motions of Eg and T2g symmetry. The damped vibrations generate a transient zero-field splitting (ZFS), of variable amplitude and variable principal di…
This paper reports the synthesis of a new one-dimensional phase, NaNb 2 PS 10, which is found to be soluble in polar organic solvents such as N -methylformamide (NMF) or dimethylformamide (DMF). Small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) studies have revealed that these covalent pol…
UV−vis spectra of 5,10,15,20-tetrakis(4-carboxyphenyl)porphyrin (TCPP) have been studied in dilute (1.0 μM) aqueous solution at pH 7.0 as a function of added electrolytes, including phosphate buffer, methyl viologen dichloride (MV), and propyl viologen sulfonate (PVS). At concentrations ≤1.0 μM and pH ≥ 7.0, TCPP is c…
Crossing nanotubes were investigated using scanning tunneling microscopy (STM) and spectroscopy. From the analysis of the measured mechanical deformation of the nanotubes, the contact force between the nanotubes is estimated to be 1 nN. Spectroscopy measurements showed two effects on the electronic structure: (i) band…
A two-dimensional copper(II)–radical complex [Cu(NITmPy)2(N3)2]n (NITmPy = 2-(3′-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide) has been prepared and characterized by X-ray crystallography. The crystal structure consists of neutral polymeric sheets in which each copper atom is bridged by the oxygen and nitrog…
Silica polymerisation activation and structure templating using arginine-based surfactants led to bio-inspired multi-scale porous materials.
A novel molecular-based magnet of three-dimensional (3-D) cyanide-bridged bimetallic assembly, {[Cu(en)2]3[W(CN)8]2·H2O}∞ (1), where en = ethylenediamine, was synthesized and structurally characterized. The assembly has a three-dimensional network structure extended by three kinds of CuII–NC–WV–CN–CuII linkages with v…
The adsorption of N 2 on close-ended single-walled carbon nanotube bundles was studied at different temperatures ranging from 81 to 94 K. The isosteric heat of adsorption was obtained from the adsorption isotherm measurements, and the binding energy of N 2 was estimated from the isosteric heat of adsorption data in th…
Abstract (Sr 1− x Ca x )Bi 2 Ta 2 O 9 bismuth‐layered compounds with composition x = 0, 0.2, 0.4, 0.6. 0.8 and 1.0 were synthesized by the conventional solid‐state route. Phase formation and structural evaluation of both calcined powders and sintered pellets were investigated using x‐ray diffraction and micro‐Raman sp…
Five Pt−Sn/Vulcan carbon nanocomposites containing metal nanoclusters highly dispersed on a carbon powder support have been prepared using trans -PtCl(PEt 3 ) 2 (SnCl 3 ) as the source of metal. Thermal gravimetric analysis of the decomposition of this complex in air reveals a single-step loss of all nonmetallic eleme…
The magnetic properties of single-crystalline ${\mathrm{Nd}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ were studied with both macroscopic and microscopic probes. The magnetization shows large irreversibility behavior between zero-field-cooled and field-cooled data at low field, suggesting a phase separation driven b…
We present distribution coefficients and crystal purity data for systems containing two of the three near-isomorphic amino acids l -leucine (LEU), l -isoleucine (ILE), and l -valine (VAL) in aqueous solutions. The data validate our earlier observation that the extent of impurity incorporation in amino acid crystals is…
Abstract Colloidal gold particles (11.2 nm) were coated with platinum overlayers, resulting in bimetallic particles with 1–8 mol% Pt. These particles were characterized using electron microscopy, energy‐dispersive x‐ray spectroscopy and electrochemistry confirming the Au–Pt core‐shell structure. The UV–visible spectra…
Abstract Cleaning substrate surfaces and checking the effectiveness of the cleaning method are two very important aspects of reliable surface analysis. The absence of a cleaning process leading to an yttria‐stabilized zirconia (YSZ) surface that is free of contaminants and of unchanged structure has inspired us to inv…