Materials Literature
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A study was made of the copper corrosion rate and corrosion products originated by the action of acetic acid vapor at 100% relative humidity. Copper plates were exposed to an acetic acid contaminated atmosphere for a period of 21 days. Five acetic vapor concentration levels were used. The copper corrosion rate was in…
By considering a Hamiltonian that includes the crystalline electric field and exchange interaction components we showed theoretically that paramagnetic ${\mathrm{PrNi}}_{5}$ exhibits an anomalous entropy behavior in which the magnetic entropy increases with increasing magnetic field at low temperature. This anomaly in…
The crystal structure of 2-pyridone has been redetermined from high-resolution X-ray data collected at 123 K. The molecule is in the lactam form. Bond lengths (corrected for rigid-body libration) and angles have been determined with s.u.'s of 0.001 A and 0.1 degree, respectively. The hydrogen-bonded cyclic dimers whic…
The previously reported reaction of phthalocyanines [H2(pc)] with PBr3, which was claimed to give a phosphorus(III) phthalocyanine “(PcPIII)”, has been reinvestigated in detail with both unsubstituted and alkyl-substituted phthalocyanines, 1-4. The products exhibit unusual electronic and mass spectra compared to norma…
Composite materials can be regarded as structures, so there is a great opportunity to design a wide range of properties for such kind of material to meet the various application requirements, even a very particular one. A negative Poisson's ratio is an example. The mechanism of negative Poisson's ratio and the basic c…
General guidelines for the design of monomers for the synthesis of hyperbranched polymers without linear units are presented. The synthesis of one monomer fulfilling these requirements and the first results of the polymerization of this monomer are described. 4-(3-Maleimidopropoxy)-4′-methoxybenzaldehyde azine was use…
In an attempt to obtain dense PbNb 2 O 6 ceramics, sintering experiments were conducted using starting powders with various particle sizes and different modifications (rhombohedral and orthorhombic structures). During sintering of rhombohedral powders, the phase transformation to the tetragonal phase promoted grain gr…
Stereoregular polymerization of ( p -nitrophenyl)acetylene (pNPA) was performed using [Rh(norbornadiene)Cl] 2 and [Rh(cyclooctadiene)Cl] 2 catalysts to give poly(( p -nitrophenyl)acetylene) (PpNPA), with a cis−transoid form under mild conditions. The polymer underwent isomerization from the predominant cis to trans fo…
A nitrogen purged static-bed batch reactor was used to pyrolyse 3 kg batches of shredded scrap tyres at temperatures between 450 and 600 °C. The yield of char remained fairly constant at about 38 wt% irrespective of pyrolysis temperature; however, the yield of oil decreased from 58 wt% to 53 wt% and the gas yield incr…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTMechanisms of Surface Electron Transfer. Proton-Coupled Electron TransferScott A. Trammell, John C. Wimbish, Fabrice Odobel, Laurie A. Gallagher, Poonam M. Narula, and Thomas J. MeyerView Author Information Department of Chemistry University of North Carolina at Chapel…
〈111〉-oriented twin free Tb–Dy–Fe single crystals, 〈112〉- and 〈110〉-oriented twinned “single” Tb–Dy–Fe crystals were prepared using floating zone melting technique. Magnetostrictive performances of the crystals were investigated. Better low-field properties were observed in the 〈110〉 twinned crystals than in the 〈112〉…
Summary The plant availability of phosphate applied to calcareous soils is affected by precipitation and adsorption reactions, the relative significance of which is not well known. We used extended P‐sorption curves obtained at phosphate addition rates up to 340 mmol P kg −1 soil to examine the relative contribution o…
The objective is to define a prediction and transposition model for cavitation erosion. Experiments were conducted to determine the energy spectrum associated with a leading edge cavitation. Two fundamental parameters have been measured on a symmetrical hydrofoil for a wide range of flow conditions: the volume of ever…
The ground state total energies of α‐ and β‐Si 3 N 4 crystals are calculated by an ab‐initio method based on local density functional theory. The calculated bulk modulus and pressure coefficients for both crystals are in good agreement with recent experimental measurements. Interatomic pair potentials of the Buckingha…
The crystal structure of NiII2(mcpa)2(CH3OH)3(H2O)[12-MCNiIIN(shi)2(pko)2-4][12-MCNiIIN(shi)3(pko)-4] metallacrown shows it to have a fused arrangement of two [12-MCM(ox)N(ligand)-4] units, the NiII(mcpa)[Ni4(shi)2(pko)2(CH3OH)2] and the NiII(mcpa)[Ni4(shi)3(pko)(CH3OH)(H2O)] with 1+ and 1− charge, respectively. Each…
We study, by means of numerical simulations, the model of dissipative particle dynamics with energy conservation for the simple case of thermal conduction. It is shown that the model displays correct equilibrium fluctuations and reproduces Fourier law. The connection between "mesoscopic coarse-graining" and "resolutio…
A class of degradable, phase-segregated multiblock copolymers is presented. The new copoly(ester-urethane)s, termed DegraPolTM/btgc, consist of crystallizable poly[(3-R-hydroxybutyrate)-co-(3-R-hydroxyvalerate)]-segments and amorphous segments from ε-caprolactone, diglycolide and ethylene glycol. As junction unit an a…
A new UHV spectroscopic X-ray photoelectron emission and low energy electron microscope is presently under construction for the installation at the PM-6 soft X-ray undulator beamline at BESSY II. Using a combination of a sophisticated magnetic beam splitter and an electrostatic tetrode mirror, the spherical and chroma…
Abstract Apatite-dolomite carbonatite at Lesnaya Varaka, Kola Peninsula, Russia, hosts intricate mineral intergrowths composed of lueshite in the core and pyrochlore-group minerals in the rim. Lueshite is a primary Nb-bearing phase in the carbonatite and ranges in composition from cerian lueshite to almost pure NaNbO…
Short bamboo fiber reinforced epoxy composites have been developed with varying fiber length. The chemical resistance tests indicate that the composite materials are resistant to acetic acid, hydrochloric acid, nitric acid, sodium hydroxide, sodium carbonate, ammonia, benzene, carbon tetrachloride and toluene. The var…