Materials Literature
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The redox behaviour of polypyrrole layers prepared by the electrochemical oxidation of pyrrole in acetonitrile solutions was studied using insitu EPR/UV–VIS spectroelectrochemistry. Various supporting electrolytes: p-toluene sulfonic acid, tetrabutylammonium perchlorate (TBAP) and tetraethylammonium p-toluene sulfonat…
The [2+4]cycloaddition of the novel A4B building block 2,3,4,5-tetrakis(4-triisopropylsilylethynylphenyl)cyclopenta-2,4-dienone 3 with 3,3’,5,5’-tetraethynylbiphenyl 1 allows the rapid synthesis of a spherical polyphenylene nanoparticle with 102 benzene rings.
ZnS nanocrystallites effectively enhanced photo-reduction of chlorinated benzene derivatives in the presence of triethylamine as a sacrificial electron donor under UV irradiation (λ > 300 nm), leading to selective and stepwise dechlorination to give benzene at the final stage.
Structure and reactivity of cellulose structure and properties swelling and dissolution degradation heterogeneous and homogeneous reactions analytical methods.
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…
Syntheses of nanometer scale, directly beta-fused oligoporphyrins sharing an extended π-system are described.
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.
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 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…
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.
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,…
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…
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…
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…
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.
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…
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…
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…
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…
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.