Fundamentals and analytical methods
Structure and reactivity of cellulose structure and properties swelling and dissolution degradation heterogeneous and homogeneous reactions analytical methods.
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Flashover of contaminated nonceramic outdoor insulators in a wet atmosphere
This paper deals with the flashover mechanism and performance of contaminated nonceramic (also known as composite and polymeric) outdoor insulators under wet conditions. Two types of wetting that occur in service, namely fog and rain, were considered. Different profiles of line insulators having weathersheds made from…
Linear fused oligoporphyrins: potential molecular wires with enhanced electronic communication between bridged metal ions
Syntheses of nanometer scale, directly beta-fused oligoporphyrins sharing an extended π-system are described.
A novel class of non-chiral banana-shaped liquid crystals with ferroelectric properties
The first banana-shaped molecules without Schiff-base units, with broad regions of a ferroelectric switchable liquid crystalline phase and low melting points, have been obtained.
Synthesis of cadmium sulfide nanoparticles in situ using γ-radiation
Cadmium sulfide nanoparticles have been produced in situ in aqueous solution at room temperature by precipitating Cd2+ ions with homogeneously released S2– ions, which were generated from the decomposition of Na2S2O3 by γ-irradiation.
Cruciform porphyrin pentamers
Cruciform porphyrin pentamers 15 and 16 are obtained in good yield by acid-catalyzed tetramerization of ZnII–pyrroloporphyrin 14, followed by oxidation with DDQ; pyrroloporphyrins are in turn obtained from the corresponding pyrrolochlorins by Diels–Alder type reactions of porphyrins involving thermal extrusion of sulf…
Synthesis of porous yttrium aluminium oxide templated by dodecyl sulfate assemblies
An yttrium aluminium oxide dodecyl sulfate mesophase with a hexagonal structure has been synthesized by a homogeneous precipitation method using urea and was converted into a porous material with a specific surface area of 662 m2 g–1 by anion exchange of the surfactant with acetate ion.
Versatile optical materials: fluorescence, non-linear optical and mesogenic properties of selected 2-pyrazoline derivatives
A study of the structure-property relationships in a series of 3-(4-n-decyloxyphenyl)-1-(p-X-phenyl)-2-pyrazolines has been performed. By simply changing the substituent in the 1-phenyl ring we were able to tune the physical properties of the compounds. If this ring is non-substituted or substituted with a 4-methoxy,…
Molecular dynamics and crystallization behaviour of isopentyl cyanobiphenyl as studied by dielectric relaxation spectroscopy
Isopentyl cyanobiphenyl may be cooled into the supercooled liquid state, forming a glass below 210 K. On heating the glass, the supercooled liquid crystallizes above 245 K. Dielectric relaxation spectroscopy (DRS) has been used in the frequency range 10−1 to 105 Hz to study (i) the reorientational motions of the molec…
Composition modulation of catalytic reactors
1. Combustion 2. Co-oxidation 3. Reduction of Nitrogen Oxides 4. Hydrogenation Reactions 5. SO2 Oxidation 6. Miscellaneous Single Reactions 7. Catalytic Gas-Solid Reactions 8. Hydrocarbon Dehyrodgenation and Partial Oxidation 9. Fischer-Tropsch Synthesis 10. Application to Mechanistic Studies 11. Automotive Exhaust Ca…
Improving endothelial cell adhesion to vascular graft surfaces: Clinical need and strategies
Synthetic vascular grafts do not spontaneously endothelialize in humans and require some form of anticoagulation to maintain patency. Preseeding synthetic graft materials such as expanded polytetrafluoroethylene (ePTFE) and polyethylene terephthalate (PET) with endothelial cells (EC) has been examined in various in vi…
A grid search procedure of positioning a known molecule in an unknown crystal structure with the use of powder diffraction data
Abstract An efficient grid search procedure successfully applied to the solution of three unknown molecular structures from X-ray and neutron powder diffraction data is presented.
Formation and annihilation of a bond defect in silicon: Anab initioquantum-mechanical characterization
The electronic structure and bond properties of a lattice defect in silicon formed by the incomplete recombination of a vacancy-interstitial pair are described by combining tight-binding molecular-dynamics and ab initio Hartree-Fock calculations. The defect structure consists of a large nuclear distortion nearly perfe…
Morphology and Crystallography of α Precipitates in β Ti–Mo Binary Alloys
The morphology and crystallography of α(hcp) precipitates formed in the β(bcc) matrix were examined in the Ti–Mo binary alloys with various Mo contents below the currently proposed monotectoid temperature by means of transmission electron microscopy.In the Ti-10, 20 and 30 mass%Mo alloys, α precipitates form on β grai…
Soft X-ray Beamline Specialized for Actinides and Radioactive Materials Equipped with a Variably Polarizing Undulator
This report presents the design of an undulator beamline at SPring-8 to be used for soft X-ray spectroscopy focused on radioactive materials. Photoemission spectroscopy experiments are carried out in a radioisotope (RI)-controlled area where actinide compounds as well as unsealed radioactive materials are usable. Intr…
Mean atomic number and backscattered electron coefficient calculations for some materials with low mean atomic number
Abstract In modelling electron backscattering from solids using Monte Carlo simulations, knowledge of mean atomic number, mean atomic weight, and density of the bulk material are required. We studied four different ways in common useforthe calculation of mean atomic number. An alternative and improved approach is to c…
Solid state coordination chemistry of the copper cyanide–organoamine system: hydrothermal syntheses and structural characterization of [{Cu2(bpy)2(CN)}Cu5(CN)6] and [Cu4(CN)4(biquin)]
The hydrothermal reactions of CuCN and Cu(NO3)2·2.5H2O with the appropriate organonitrogen ligand in water yielded a one-dimensional chain, [Cu4(CN)4(biquin)] 1, and a material with a two-dimensional anionic honeycomb network and interpenetrating binuclear cations, [{Cu2(bpy)2(CN)}Cu5(CN)6] 2.
Preparation of transparent mesoporous silica films by a rapid solvent evaporation method
Thin films of silica-alkyltrimethylammonium (alkyl=decyl, dodecyl, tetradecyl, hexadecyl and octadecyl) chloride mesostructured materials are synthesized by spin coating the precursor solutions containing prehydrolyzed tetramethoxysilane and alkyltrimethylammonium salts. The films have been converted to transparent po…
Surface characteristics and biocompatibility of lactide-based poly(ethylene glycol) scaffolds for tissue engineering
Novel lactide-based poly(ethylene glycol) (PEG) polymer networks (GL9-PEGs) were prepared by UV copolymerization of a glycerol-lactide triacrylate (GL9-Ac) with PEG monoacrylate (PEG-Ac) to use as scaffolds in tissue engineering, and the surface properties and biocompatibility of these networks were investigated as a…
Volume average demagnetizing tensor of rectangular prisms
An exact analytic formula is presented for the magnetostatic field produced by a three-dimensional array of uniformly magnetized rectangular prisms. It is derived from the volume integration of a point-function demagnetizing tensor. The values of the point-function demagnetizing tensor at the centers of rectangular pr…