Materials Literature
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Abstract The influence of some paraffinic oils on rheological properties, dynamic properties, and behavior at low temperature of various ethylene–propylene–diene monomer rubber (EPDM) compounds was studied. Three different types of EPDM, Dutral TER 4049, Dutral Ter 4038, and Nordel IP 4770 R, and five different paraff…
Abstract In this article we consider the Gauss Legendre Quadrature method for numerical integration over the standard tetrahedron: {( x , y , z )|0 ≤ x , y , z ≤ 1, x + y + z ≤ 1} in the Cartesian three‐dimensional ( x , y , z ) space. The mathematical transformation from the ( x , y , z ) space to (ξ, η, ζ) space is…
We have studied the thermoelectric properties of free-standing GaN and fabricated a themoelectric power device using this GaN. The electrical resistivity ρ increased and the Seebeck coefficient α slightly increased with increasing temperature in the range from 373 K to 973 K. The power factor decreased with increasing…
Oxidative fragmentation of the clusters Os(3)(CO)(12) adsorbed on MgO powder was investigated by X-ray absorption spectroscopy and scanning transmission electron microscopy (STEM). Exposure of the clusters to air leads to their fragmentation, oxidation of the osmium, and formation of ensembles consisting of three Os a…
We report a numerical study of the shear viscosity and the frequency dependent elastic moduli close to dynamical arrest for a model of short range attractive colloids, both for the repulsive and the attractive glass transition. Calculating the stress autocorrelation functions, we find that density fluctuations of wave…
Using a symmetry-based atomic scale theory of lattice distortions, we demonstrate that elastic textures, such as twin and antiphase boundaries, can generate intricate electronic heterogeneities in materials with strong electron-lattice coupling, as observed in perovskite manganites and other functional electronic mate…
In situ self-assemblies of new biodegradable triblock PLLA-b-PBS-b-PLLA and PDLA-b-PBS-b-PDLA have been investigated in acetonitrile solution. At first, two series of PLLA-b-PBS-b-PLLA and PDLA-b-PBS-b-PDLA, respectively denoted as the P and Q triblock copolyester series, were prepared with fixed PBS block ((overline)…
This paper presents an extensive study of various string and tubular structures formed by carbon atomic chains. Our study is based on first-principles pseudopotential plane wave and finite-temperature ab initio molecular dynamics calculations. Infinite- and finite-length carbon chains exhibit unusual mechanical and el…
The formation of syndiotactic polystyrene (sPS) intercalates in a series of solvent derived from naphthalene, namely naphthalene, 1,2,3,4-tetrahydro naphthalene (tetralin), and trans -decahydronaphthalene ( trans -decalin) has been investigated. For each systems, the temperature−concentration phase diagrams have been…
We demonstrate the technique of XPCS microrheology on opaque polymeric solutions (1-20% w/w) using colloidal silica probes. The short time decay of the intensity correlation function provides the mean square displacement (MSD) of the colloidal probes. The MSDs of the probes are subsequently transformed using the gener…
Step-like negative differential resistance is observed in patterned Pr0.65(Ca0.75Sr0.25)0.35MnO3 structures with mesoscopic (micrometer) length scales. Key to the appearance of the steps is a field- and temperature-dependent mixture of ferromagnetic metal (FMM) and charge ordered insulating (COI) phases found in this…
We studied the phonon transport in free-standing 1μm thick silicon-nitride membranes at temperatures around 100 mK. By varying the geometry of the membranes and the dimensions of the heater element, we are able to distinguish between radiative and diffuse phonon transport. The data indicate that the transport is radia…
Abstract Prevulcanized natural rubber latex was prepared by the heating of the latex compound at 55°C for different periods of time (2, 4, 6, 8, and 10 h). The changes in the colloidal stability and physical properties were evaluated during the course of prevulcanization. The prevulcanized latex compounds were stored…
The specific heat of pure lead titanate (PbTiO 3 ) crystals grown by the float-zone method is reported at temperatures of 325–1250 K. The excess specific heat associated with the ferroelectric phase transition was analysed using a 2–4–6 Landau potential to self-consistently determine the Curie–Weiss temperature, the t…
Abstract Summary: A set of copolymers of isotactic propylene and 1‐octadecene (CiPOD) and the corresponding isotactic poly(propylene) homopolymer (iPP) have been synthesized using a metallocene catalyst. The influence of the incorporation of this long chain comonomer on the structure and final properties exhibited by…
We further pursue the analysis of a mean-field model recently proposed by Sonnet [Phys. Rev. E 67, 061701 (2003)] to describe nematic biaxial phases. This model, which is based on a simplified version of Straley's pair potential, is characterized by the prediction of a tricritical point along the transition line betwe…
Abstract The aim of this study was to review the mechanical properties (at break) of plasticized starch‐based materials from the literature. The methodology relied on the use of a graphic tool allowing a direct comparison of the strength and strain at break. The mechanical properties of the materials were systematical…
Yb(3+) ions with various site symmetries have been observed in the absorption and emission spectra of Yb(3+):CaF(2) crystals, both γ-irradiated and annealed in hydrogen. The absorption intensity value is found to be much higher for the γ-irradiated crystal and strongly dependent on the gamma dose. The UV absorption sp…
Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) melt processed disks and solvent cast films were modified by graft co-polymerization with acrylic acid (AAc) in methanol solution at ambient temperature using gamma irradiation (dose rate of 4.5 kGy/h). To assess the presence of carboxylic acid groups on the surface,…
We report the analysis of repeated transients to monitor the coupled evolution of dislocation velocity and mobile dislocation density in plastically deforming nanocrystalline Ni. The stress relaxation series allowed the determination of the physical activation volume, indicating a rate-controlling mechanism different…