Materials Literature
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Chlorins with highly substituted exocyclic double bonds extending the chromophoric system were synthesized starting from the readily accessible oxochlorin. After sulfurization of the keto function of oxochlorin 7 the formed thioketo chlorin 8 underwent Barton olefination with diazo compounds.
Hydrogen embrittlement tests were performed on 0·254 mm diameter BS 5216 M4 high strength carbon steel wire using constant loads to give initial tensile stresses in the range 48–91% ultimate tensile stress. The wires were electrolytically charged with hydrogen in 4%H2SO4 at current densities of 75 and 150 mA cm–2. The…
We discuss models for massless Dirac fermions being subjected to a perpendicular magnetic field in spherical geometry. These models are analogs of Haldane's spherical construction for massful charge carriers. The single-particle states constructed here are easily implemented in existing numerical code for many-body pr…
The susceptibility to sulphide stress corrosion cracking (SSCC) of four conditions of shielded metal arc welding repairs and one as welded specimen of the girth weld in seamless API X-52 microalloyed steel pipe were evaluated using slow strain rate tests. The slow strain rate tests were performed in air and in a NACE…
Leather making involves conversion of a putrefiable skin or hide protein (collagen) into nonputrescible material. Environmental concerns have forced the leather industry to develop tanning systems based on natural products. Vegetable tanning is one of the oldest methods of tanning. However, there is limitation in the…
Hypervelocity impact of spherical and cylindrical projectiles on multipate shields at velocities between 4 and 6km∕s was investigated experimentally. A model was developed to describe the motion of the debris clouds generated. Good agreement was obtained between the experimental and simulation results. The model is ca…
In this study, polystyrene/polypropylene (PS/PP) reinforced coconut and jute fibers were prepared by injection moulding. The total fiber content was fixed at 10wt% with the ratios of 100/0, 75/25, 50/50, 25/75 and 0/100 weight of coconut fiber/jute fiber. The effects of reinforced coconut and jute fibers on mechanical…
Reaction of H 2 phpzR (R = H, Me, Ph; H 2 phpzH = 3(5)-(2-hydroxyphenyl)pyrazole, H 2 phpzMe = 3(5)-(2-hydroxyphenyl)-5(3)-methylpyrazole, and H 2 phpzPh = 3(5)-(2-hydroxyphenyl)-5(3)-phenylpyrazole)) with MnCl 2 ·2H 2 O or MnBr 2 ·4H 2 O in an acetonitrile−methanol mixture and in the presence of a small quantity of t…
Dynamically vulcanized EPDM/PP (ethylene-propylene-diene/polypropylene) elastomers reinforced with various amounts of organoclay were prepared using octylphenol-formaldehyde resin and stannous chloride dehydrate as vulcanizing agents. The effects of organoclay on vulcanization characteristics, rheological behavior, mo…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSilk Fiber Formation after High-Pressure Treatment of Fibroin Solution in a Diamond Anvil CellRonald Gebhardt, Charlotte Vendrely†, Michael Hanfland, and Christian Riekel*View Author Information European Synchrotron Radiation Facility, B.P. 220, F-38043 Grenoble Cedex, France*…
The percolative film capacitor structure of Pt/Bi2Mg2/3Nb4/3O7 [BMN(Ar) films deposited at pure argon atmosphere]/Pt was addressed for achievement of a high dielectric constant in the films deposited at room temperature by radio frequency magnetron sputtering. The deterioration of the leakage current characteristics i…
The effect of sample microstructure on water dynamic wetting behavior was examined for superhydrophobic ZnO films. Surface morphology ranging from needle arrays to overlapping platelets was controlled through judicious choice of hydrothermal reaction conditions. Structure modification with alkyl and perfluoroalkyl cha…
Computational studies using density functional theory are carried out on linear chains of urea, N,N(')-dimethyl urea and N,N,N('),N(')-tetramethyl urea, and their sulfur analogs, viz., thiourea, N,N(')-dimethyl thiourea and N,N,N('),N(')-tetramethyl thiourea with varying chain length, to understand the effect of hydro…
Antimicrobial edible films were prepared from natural fiber of pectin and other food hydrocolloids for food packaging or wrapping by extrusion followed by compression or blown film method. Microscopic analysis revealed a well-mixed integrated structure of extruded pellets and an even distribution of the synthetic hydr…
We have developed a method to selectively assemble and align carbon nanotubes (CNTs) on soft substrates for use as flexible biosensors. In this strategy, a thin oxide layer was deposited on soft substrates via low temperature plasma enhanced chemical vapor deposition, and a linker-free assembly process was applied on…
This article reports a systematic study of the effects of two different kinds of cotton fibers on properties of composites. Both cotton fibers exhibit similar mechanical properties. However, they vary in fineness and maturity. The intention of this study is to investigate the influence of these fiber properties on the…
ZnO nanowires were grown by metallorganic chemical vapor deposition from zinc acetylacetonate hydrate and oxygen without using any seed particles or templates. Nanowires grew epitaxially on sapphire substrates to form dense arrays but with random orientation on and glass. Nanowire morphology was studied as a function…
Abstract A hydroxylactone ((1R,5S)‐1‐hydroxy‐3,6‐dioxabicyclo [3.2.1] octan‐2‐one, abbreviated as LAC) obtained from catalytic pyrolysis of cellulose was investigated as a monomer in the synthesis of polyesters by ring‐opening polymerization (ROP) with L ‐lactide. Although stannous octoate resulted inactive, ROP initi…
A new clean catalytic process for liquid phase selective oxidation of toluene has been carried out on CeO 2 promoted sulfated TiO 2 (SO 4 2− /TiO 2 −CeO 2, abbreviated as STC) catalyst with ozone−air at ambient temperature and atmospheric pressure. Neither solvent nor promoters are needed in the reaction system. STC w…
We find that dipolar interactions favor ferromagnetic ordering of elongated crystals of ${\text{Mn}}_{12}$ acetate below 0.8 K. Ordered crystals must possess domain walls. Motion of the wall corresponds to a moving front of Landau-Zener transitions between quantum spin levels. Structure and mobility of the wall are co…