Materials Literature
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The devolatilization kinetics of a biomass charcoal was studied by thermogravimetry−mass spectrometry. The overall mass loss rate (DTG curve) and the mass spectrometric intensities of ions H 2 +, CH 3 +, C 2 H 2 +, C 2 H 3 +, and C 2 H 5 + were evaluated. The distributed activation energy model (DAEM) was employed, si…
Massive macroscopic ropes of well-aligned single-walled carbon nanotubes (SWNTs) with a larger mean diameter of about 1.72 nm, synthesized by a semicontinuous hydrogen arc discharge method, were employed for electrochemical hydrogen adsorption experiments. A high discharge capacity of 503 mAh/g, corresponding to 1.84…
In many solid solutions plastic deformation becomes unstable at sufficiently high temperature due to dynamic strain aging, i.e., repeated breakaway of dislocations from their solute clouds and recapture by mobile solutes, producing stress serrations in constant strain-rate tests or strain bursts in constant stress-rat…
The use of NO x traps is one strategy being pursed to enable the implementation of more fuel-efficient lean-burn gasoline engines. Materials development to enhance NO x storage capacity and sulfur tolerance will be necessary for performance improvement. Progress in these areas will benefit from a more detailed underst…
A series of ternary Eu 3+ complexes are presented consisting of a polydentate m -terphenyl-based Eu 3+ complex (Eu) 1 and different antenna chromophores possessing lanthanide(III) ion coordinating properties. The series of investigated antenna chromophores consist of 1,10-phenanthroline, tetraazatriphenylene, and thre…
An algebraic model based on Lie-algebraic and discrete symmetry techniques is applied to the analysis of thermodynamic vibrational properties of molecules. The local anharmonic effects are described by a Morse-like potential and the corresponding anharmonic bosons are associated with the SU(2) algebra. A vibrational h…
A new approach to create chemically patterned surfaces utilizing polymers and copolymers is introduced. In this approach, chemical patterns are achieved by the direct stamping of functional polymers onto a surface containing complementary functional groups. The resulting pattern is then used as a template for the furt…
We have studied the critical temperature of Diluted Magnetic Semiconductors by means of Monte Carlo simulations and Coherent-Potential-Approximation (CPA) calculations. In our model for this syste m, the magnetic ions couple with the carriers through an antiferromagnetic exchange interaction, $J$, and an electrostatic…
We develop a theory for the inclusion of adatom interactions in second layer nucleation occurring in epitaxial growth. The interactions considered are due to ring barriers between pairs of adatoms and binding energies of unstable clusters. The theory is based on a master equation, which describes the time development…
Given an assembly of viscoelastic spheres with certain material properties, we raise the question how the macroscopic properties of the assembly will change if all lengths of the system, i.e. radii, container size etc., are scaled by a constant. The result leads to a method to scale down experiments to lab-size.
The theoretical investigations on electrorheological (ER) fluids are usually concentrated on monodisperse systems. Real ER fluids must be polydisperse in nature, i.e., the suspended particles can have various sizes and/or different dielectric constants. An initial approach for these studies would be the point-dipole (…
We present the first application of phase field modeling to electrochemistry. A free energy functional that includes the electrostatic effect of charged particles leads to rich interactions between concentration, electrostatic potential, and phase stability. The present model, explored for the equilibrium planar inter…
Static and dynamic aspects of the magnetization reversal in nanowire arrays are investigated. The arrays have been produced by electrodeposition of ferromagnetic metals (Fe, Co, and Ni) into porous anodic alumina templates, with diameters as small as 5 nm. The crystal structures of the nanowires are bcc (Fe) and fcc (…
The three-dimensional framework of [Gd(H(2)O)(3)](3)[GdMo(12)O(42)]vdt.3H(2)O, which was synthesized from hydrothermal reaction, is built up from Silverton-type anions linked by nine coordinated gadolinium(III) cations. It is the first time that the paramagnetic lanthanide(III) cation is introduced into the Silverton-…
Gold–silver bimetallic nanoparticles with varying mole fractions were synthesized in water-in-oil microemulsions of water/Aerosol OT/isooctane by the co-reduction of HAuCl4 and AgNO3 with hydrazine at 25 °C. TEM analysis revealed that the bimetallic nanoparticles were essentially monodisperse and had a mean diameter o…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
<div class="htmlview paragraph">An Isotropic Superfinish (ISF) is produced by a patented chemically accelerated vibratory finishing process using non-abrasive media that is capable of surface finishing hundreds of parts per hour. Rolling/Sliding Contact Fatigue testing shows that this commercial technology virtu…
Abstract A new diimide–diacid monomer, N , N ′‐bis(4‐carboxyphenyl)‐4,4′‐oxydiphthalimide (I), was prepared by azeotropic condensation of 4,4′‐oxydiphthalic anhydride (ODPA) and p ‐aminobenzoic acid ( p ‐ABA) at a 1:2 molar ratio in a polar solvent mixed with toluene. A series of poly(amide–imide)s (PAI, III a–m ) was…
<div class="htmlview paragraph">Intensive quenching, known as IntensiQuench<sup>SM</sup>, is an alternative way of hardening steel parts developed by Dr. Kobasko of the Ukraine. It provides steel products with superior mechanical properties, creates high residual compressive stresses on the part surf…
Various graphite-like B–C–N materials were synthesized in the precursor pyrolysis system of boron trichloride and nitrogen-containing materials such as heptaazaphenalene derivatives, carbodiimides, amines, nitriles and cyanamides. The materials obtained were described with a formula of CNx(BN)y and CBx(BN)y consisting…