Materials Literature
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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…
Abstract Standing on a hypothesis that the sharkskin of a polymer with a narrow molecular weight distribution at extrusion processing originates from a stick‐slip of the polymer at the die wall, the suppression of the sharkskin was tried by means of suppressing the slip by the addition of adhesives. To polypropylene (…
The total vapor pressure of HoCl 3, HoBr 3, and HoI 3 was measured by the torsion and Knudsen effusion methods. By a least-squares treatment of the obtained data, the following equations were selected as representative for the temperature dependence of their vapor pressures in the covered temperature ranges: HoCl 3 (s…
Abstract Two series of polypropylenes with different molecular weight distribution and tacticity characteristics were injection molded into flexural test specimens by varying cylinder temperature and the effects of the molecular weight distribution and tacticity on the structure and properties of the moldings were stu…
Abstract High‐temperature (180°C) molding of epoxidized natural rubber (ENR) filled with precipitated silica leads to chemical bond formation between epoxy groups of ENR and silanol groups of silica. The extent of chemical bond formation is further enhanced in the presence of the silane coupling agent N‐3‐N ‐(vinyl be…
NiMnSb(001) high-quality epitaxial thin films have been prepared by molecular-beam epitaxy. The growth and morphology of the films have been extensively studied using electron diffraction and scanning tunneling microscopy. We report the presence of various surface structures on the free NiMnSb(001) surface. The struct…
The synthesis of 4'-(C6H4-p-NBU2)-2,2':6',2" -terpyridine and the strongly enhanced second-order NLO response of its Zn(II), Ru(III) and Ir(III)complexes are reported, evidencing for the first time a shift from positive to negative value of the ligand quadratic hyperpolarizability by varying the nature of the metal ce…
Abstract Poly( N ‐methylaniline) thin films show different cyclic voltammetric behaviour when cycled in HClO 4 , HBF 4 , HCl or HNO 3 . While in the first two acids the film shows profiles peak potentials similar to those of polyaniline, profiles in HCl and HNO 3 show higher peak potentials for oxidation and a differe…
Abstract Bismuth triborate, BiB 3 O 6 (BiBO), a promising new material for effective frequency conversion, was synthesized by top‐seeded growth from the nearly stoichiometric melt at high temperature. The crystal space group is non‐centrosymmetric monoclinic C 2 with Z = 2. The lattice constants were a = 7.116(2), b =…