Materials Literature
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The hydrothermal syntheses, crystal structures and thermal behaviours of three new 3-D framework molybdenum(VI) oxide hybrid materials, [MoO 3 (pyz) 0.5 ] 1 (pyz=pyrazine), [{Cu(pip) 0.5 }MoO 4 ] (pip=piperazine) 2 and [H 2 Mo 2 Cu 3 O 10 ] 3, are presented. 1 and 2 that are hybrids of inorganic oxide layers and bridg…
The influence of the synthesis route of Mg 2 Co hydrogen-storage alloy has been studied. It is shown here that mechanical alloying (MA) allows one to obtain crystallized products after milling for 100 h. It seems to crystallize in a face centered cubic structure (a=1.153 nm). However, when the milling is continued bey…
Chromium and boron compounds have potential for structural applications which require high temperature strength because of their high melting point, chemical stability, hardness and strength. Ball-milling of elemental powder mixtures without external heat application has been processed as a mechanism for the mechanoch…
An effective model is presented for the evaluation of the electric field dynamics inside electrical components, using nonlinear stress grading materials. The model, implemented in a numerical procedure, permits the solution of the Laplace equation and the diffusion equation by adopting the Galerkin method. Two-dimensi…
The robustness of density functional theory cluster model predictions for a variety of adsorbate complexes in Cu-exchanged zeolites is tested via systematic comparisons of four different models. Results for O, O2, OH, CO, N2, NOx, and SOx binding, obtained using an Al(OH)4 representation of the zeolite support (Z), ar…
Several new ferrocene-functionalised porphyrins and a ruthenocene-functionalised porphyrin have been synthesized and studied using electrochemistry, electronic absorbance and resonance Raman spectroelectrochemical techniques. The porphyrin and ferrocene are observed to have limited effect on each other with the proper…
Flatband potentials of boron‐doped polycrystalline and single crystal chemical vapor deposition and high‐temperature, high‐pressure diamond electrodes were estimated by three photoelectrochemical methods (i) as the photocurrent onset potential, (ii) from the dependence of photopotential on the light intensity, and (ii…
Curve fitting analysis of Al K-edge XANES is employed as a novel characterization method for the quantitative estimation of tetrahedral and octahedral Al in various aluminas.
The lower-rim substituted calix[4]arene, 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetrakis(dimethylphosphinoylmethoxy)calix[4]arene (L) has been synthesized and characterised by the single-crystal structure of its acetonitrile adduct, L·2MeCN (monoclinic, space group P21/c). The ligand adopts a cone conformation and a…
Dielectric dispersion in disordered Pb(In 0.5 Nb 0.5 )O 3 crystals was studied. Two dispersion regions were found at 10 3 -10 5 Hz and 10 8 -10 9 Hz at room temperature. The low-frequency relaxation process, which has a very wide distribution of relaxation times, shifts to higher frequency (up to about 10 9 Hz) and be…
Cyanide in alkaline aqueous solution is reported to be destroyed by a facile sonochemical process. In the presence of power ultrasound emitted from a horn probe with a frequency of 20 kHz and up to 60 W cm-2 intensity a decay in the concentration with first order kinetics is monitored by ion selective electrode techni…
A number of carbosilane dendrimers derivatised on their external surface by silanol groups have been synthesized and characterised. The new molecules are prepared by repetitive hydrosilation/alkenylation reactions, and then careful hydrolysis of Si–Cl groups in one of two ways produces dendrimers with external Si–OH g…
After 3 years, an advanced transmission electron microscope (ARHVTEM) was finely tuned. Environmental mechanical vibration causing serious disturbance for atomic-resolution observation was effectively damped by an air spring suspension system. Stray magnetic fields from the subway running 250 m away were found to degr…
A physiologically based pharmacokinetic model was developed to evaluate the kinetics of one of the newest sonographic contrast agents available, FS069 or Optison. This material consists of octafluoropropane gas encapsulated in proteinaceous microspheres, injected intravenously for use as a myocardial contrast agent in…
A series of novel cationic merocyanine dyes were prepared by condensation of 1,2,3,3-tetramethylindolium derivatives and 3-formyl-4H-1-benzothiopyran or -benzopyran derivatives, and their photochromic properties were investigated, especially focusing on the substituent effect in the indolium moiety. These dyes were co…
A standardless semi-quantitative method for wavelength dispersive spectrometry (WDS) electron probe microbeam analysis was developed with a view to simplifying the analytical procedure required with this apparatus. Based on spectrum acquisition, this method is a way to obtain the sample composition in a short time wit…
A new material was studied for high-efficiency motor cores that need higher magnetic flux density, lower iron loss, and lower mechanical hardness. Excessively high Si content tends to decrease magnetic flux density of nonoriented electrical steel sheets. The composite addition of rare-earth metals (REM) and Al into mo…
For molecular-scale electronic devicesnon-conjugated materials whose π-orbitals are close enough to allow energy transfer by the so-called Dexter mechanism are of interest. In this paper the synthesis of a soluble polymer (see Figure) is described in which aromatic conjugation and through-space π-orbital overlap (homo…
An investigation of the dependence of the thermal stability of DLC (a-C:H) and silicon-modified DLC (a-C:H:Si) films on film-deposition conditions has been conducted. An interpretation based on plasma chemistry, x-ray photoelectron spectroscopy, confocal Raman spectroscopy and substrate-bias-voltage changes is propose…
pH microsensors were incorporated into a microcapillary cell to monitor pH changes simultaneously with electrochemical measurements. The microsensors ( diameter d = 10 μ m ) were positioned at the center of the microcapillary cell tip opening ( d = 100 μ m ) and 50 mm above the surface of the sample. During the dissol…