Materials Literature
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Comprehensive neutron-powder diffraction and Rietveld analyses were carried out to clarify the relation between the crystal and magnetic structures of La2-2xSr1+2xMn2O7 (0.30 =< x =< 0.50). The Jahn-Teller (JT) distortion of Mn-O6 octahedra, i.e., the ratio of the averaged apical Mn-O bond length to the equatorial Mn-…
Raman backscattering measurements were performed on boron and phosphorous doped polycrystalline silicon films with an average grain size varying between 150 and 2500 nm. The B- and P-doped samples exhibit free hole and electron concentrations of up to $5\ifmmode\times\else\texttimes\fi{}{10}^{20}$ and $2\ifmmode\times…
We study the 38-atom Lennard-Jones cluster with parallel tempering Monte Carlo methods in the microcanonical and molecular dynamics ensembles. A new Monte Carlo algorithm is presented that samples rigorously the molecular dynamics ensemble for a system at constant total energy, linear and angular momenta. By combining…
We examine the relative stability of both stoichiometric and nonstoichiometric ${\mathrm{N}\mathrm{b}/\mathrm{A}\mathrm{l}}_{2}{\mathrm{O}}_{3}$ interfaces and ${\mathrm{Al}}_{2}{\mathrm{O}}_{3}$ surfaces. Results of first-principles computations of surface and interfacial atomic relaxations, electron-density distribu…
The relationship between nanostructure and properties in polysiloxane layered silicate nanocomposites is presented. Solvent uptake (swelling) in dispersed nanocomposites was dramatically decreased as compared to conventional composites, though intercalated nanocomposites and immiscible hybrids exhibited more conventio…
High-resolution angle-resolved photoemission spectroscopy (ARPES) was used to investigate the transition metal dichalcogenide (TMC) $1T\ensuremath{-}{\mathrm{TiSe}}_{2}$ above and below the phase transition. We find that this system fulfills special conditions such as narrow band width and flat dispersion for bands wi…
In this paper, a model is proposed for the kernel in the generalized mixing rule recently formulated by Anderssen and Mead (1998). In order to derive such a model, it is necessary to take account of the rheological significance of the kernel in terms of the relaxation behaviour of the individual polymers involved. Thi…
This paper discusses a theory of natural circular dichroism in the x-ray region. Integrated spectra are interpreted in terms of microscopic effective operators, which are derived in the framework of a localised (atomic) model. It is shown that the generators of a de Sitter group, such as that introduced by Goshen and…
The simplest anharmonic characteristics of Ir and Rh are discussed in the framework of a previously developed simple pseudopotential model which describes the elastic moduli, phonon spectra and the lattice heat capacity in the harmonic approximation of these metals succesfully. The microscopic Gruneisen parameters, th…
The heat capacity and isomer distributions of the 38-atom Lennard-Jones cluster have been calculated in the canonical ensemble using parallel tempering Monte Carlo methods. A distinct region of temperature is identified that corresponds to equilibrium between the global minimum structure and the icosahedral basin of s…
An effective-mass Hamiltonian is derived for carbon nanotubes in the presence of a weak spin-orbit interaction. The spin-orbit interaction gives rise to terms corresponding to a kind of a spin-Zeeman energy due to magnetic fields in the circumference and axis direction. As a result spin scattering is induced even by s…
A new process was developed to fabricate electrically conducting nylon 6/graphite nanocomposites via intercalation polymerization of ϵ-caprolactam in the presence of expanded graphite. The transition from an electrical insulator to an electrical semiconductor for nylon 6 occurred when the graphite volume content was 0…
New tissue engineering technologies will rely on biomaterials that physically support tissue growth and stimulate specific cell functions. The goal of this study was to create a biomaterial that combines inherent biological properties which can specifically trigger desired cellular responses (e.g., angiogenesis) with…
1. Introduction Reference 2. A Few Useful Crystal Structures Introduction Close-Packed Structures Structures for Eight-Coordinate Cations Structures for Ternary Compounds Conclusion References Problems 3. Lattice Defects and the Law of Mass Action Introduction Lattice Defects as Part of the Equilibrium State The Law o…
When a liquid drop impacts a solid, it spreads (with possibly beautiful fingering patterns) up to the point when kinetic energy is dissipated by viscosity. Then, it can retract (if the solid is partially wetted by the liquid), or not. A very different behaviour can be observed on highly hydrophobous solids. On such so…
The complete sequence of the Bombyx mori fibroin gene has been determined by means of combining a shotgun sequencing strategy with physical map-based sequencing procedures. It consists of two exons (67 and 15 750 bp, respectively) and one intron (971 bp). The fibroin coding sequence presents a spectacular organization…
Shape memory alloys (SMAs) have emerged as a class of materials with unique thermal and mechanical properties that have found numerous applications in various engineering areas. While the shape memory and pseudoelasticity effects have been extensively studied, only a few studies have been done on the high capacity of…
Peripher heterogene Dendrimere werden beschrieben, bei denen sowohl Ferrocen- als auch Cobaltocenium-Einheiten an der „Oberfläche”︁ von dendritischen Poly(propylenimin)-Gerüsten (siehe Bild) angebracht sind. Die Gegenwart der beiden redoxaktiven Gruppen ermöglicht Anwendungen der heterometallischen Dendrimere in amper…
As SMAs gain popularity for use as large force actuators, one constitutive parameter that becomes particularly important is the thermomechanical fatigue life, in addition to maximum transformation strain and stability of actuation cycles. Even though the effect of thermal transformation cycles on the transformation ch…
Size monodisperse silver nanocrystals have been stabilized by chemisorption of long-chain alkane thiols incorporating a receptor site. When dispersed in a suitable solvent these nanocrystals recognize and selectively bind a long-chain alkane incorporating two complementary substrate sites and are noncovalently linked.…