Materials Literature
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Abstract Concern over the migration of low molecular weight plasticizer from flexible poly(vinyl chloride) (PVC) used in toys and medical products has spearheaded the commercialization of a number of plasticizing polymers. In this study the plasticizing behavior of an ethylene/vinyl acetate/carbon monoxide terpolymer…
A cytosine-substituted nitronylnitroxide radical ( 1 ) was synthesized. The nucleobase moiety plays a primary role in molecular packing in the crystal. It has been found from X-ray structure analyses and magnetic susceptibility measurements that the intermolecular magnetic interactions in the crystal are propagated by…
In this work electron-beam-induced potentials are analysed theoretically and experimentally for semiconductors. A theoretical model is developed to describe the surface potential distribution produced by an electron beam. The distribution of generated carriers is calculated using semiconductor equations. This distribu…
We investigate the potential energy surface of a ${\ensuremath{\phi}}^{4}$ model with infinite range interactions. All stationary points can be uniquely characterized by three real numbers ${\ensuremath{\alpha}}_{+},{\ensuremath{\alpha}}_{0},{\ensuremath{\alpha}}_{\ensuremath{-}}$ with ${\ensuremath{\alpha}}_{+}+{\ens…
A variational approach to microscopic kinetics of an interacting lattice gas is presented. It accounts for the equilibrium correlations in the system and allows one to derive an algebraic expression for the particle density (coverage) dependent chemical diffusion coefficient for a wide variety of interaction models. D…
A microscopic theory for rare-earth ferromagnetic hexaborides, such as Eu1-xCaxB6, is proposed on the basis of the double-exchange Hamiltonian. In these systems, the reduced carrier concentrations place the Fermi level near the mobility edge, introduced in the spectral density by the disordered spin background. We sho…
Although widespread in nature, the biomineralisation processes of silica formation by living organisms are still poorly understood. Recent advances in the elucidation of biosilicification mechanisms by combining analytical, biomolecular and biomimetic approaches are reviewed, focusing on sponge spicule and diatoms fru…
A fundamental question in the study of ferromagnetic shape-memory alloys is, what is the nature of the magneto-elastic coupling in these alloys and to what extent does it drive the structural transformation? This question also holds the key to developing new and optimized alloys that combine high strains at low switch…
We report on inelastic x-ray scattering experiments on crystalline and glassy phases of ethanol in order to directly compare the influence of disorder on high frequency acoustic excitations. We find that both the dispersion and the line-width of the longitudinal acoustic excitations in the glass are the same as in the…
[reaction: see text] Condensation of squaric acid with quinaldinium salts containing electron-donating substituents gave only the semisquaraines. However, with salts possessing electronegative and electron-withdrawing groups, the squaraine dyes were isolated in quantitative yields. The semisquaraines formed undergo co…
Ferromagnetic shape-memory actuator materials offer an ingenious route to actuation by an applied magnetic field rather than the slow process of shape change by temperature in conventional shape-memory alloys. These actuator materials combine high strains with fast reaction times. This work shows the detailed temperat…
Abstract Polyamide/epoxysilane (coupling agent) composites were reacted with poly(dimethylsiloxane) (PDMS), a condensation product of diethoxydimethylsilane (DEDMS), by a sol–gel process. Polyamide–PDMS nanocomposites were obtained. The existence of the condensation product of DEDMS and the reaction between the epoxy…
We propose a multi-order parameter phase field system and a sharp interface model to describe bi-directional diffusion induced grain boundary motion in the presence of triple junctions. Numerical approximations of the models are presented together with some computational results.
Abstract The time‐related cumulated noise charges extracted from the noise signals between two “identical” crevice electrodes yield a direct quantitative easy‐to‐interpret information on time‐related corrosion intensities in the crevice. A new software‐assisted method of noise data evaluation allows a “counting of cou…
Phase-separation behavior in the sol−gel system of alumina−silica (Al 2 O 3 −SiO 2 ) in the presence of poly (ethylene oxide) has been investigated. Amorphous gels with interconnected macropores can be obtained from the starting composition containing up to 10 mol % Al 3+ by inducing phase separation parallel to the s…
Abstract The mechanical and thermal properties of glass bead–filled nylon‐6 were studied by dynamic mechanical analysis (DMA), tensile testing, Izod impact, thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC) tests. DMA results showed that the incorporation of glass beads could lead to a subs…
Structural features and methods for the synthesis of complex manganese oxides with the brownmillerite structure A2MnB'O5+δ (A = Ca, Sr; B' = Ga, Al) and of their derivatives are surveyed. Modern approaches to the description of crystal structures containing various types of chains of tetrahedra are considered and poss…
Abstract The effects of two compatibilizing agents, polystyrene–poly(ethylene butylene)–polystyrene copolymer (SEBS) and SEBS‐grafted maleic anhydride (SEBS‐ g ‐MAH), on the morphology of binary and ternary blends of polyethylene, polypropylene, and polyamide 6,6 were investigated with scanning electron microscopy and…
The lines of research in the field of inorganic chemistry that are closely related to the design of novel functional materials are analysed. Special attention is given to areas of inorganic materials chemistry that have been developed most intensely at the Division of Inorganic Chemistry of the Department of Chemistry…
The thermal decomposition of dimethyl methylphosphonate (DMMP), which is a simulant molecule for organophosphorus nerve agents, has been investigated on Cu clusters as well as on Cu films deposited on a TiO(2)(110) surface. Scanning tunneling microscopy studies were conducted to characterize the cluster sizes and surf…