Materials Literature
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This paper describes the dependence on test parameters of the fatigue resistance of EPDM. Fatigue was investigated using dumbbell specimens under load control at 1 Hz until failure. Tests were made in order to create a common Wöhler (S–N) curve while increasing the stress amplitude and also to show the influence of in…
Thermomechanically coupled finite element analysis of the hot plane strain compression test has been carried out to investigate the effect of various test parameters on the measured response and deformation of specimens. The results are presented in a series of papers. In this paper (Part 1), the results of two-dimens…
A statistical model, the Ising model, is used to simulate liquid wetting of fibrous assemblies. The adhesive energy between fiber and liquid and the cohesive energy within the liquid are calculated by applying the Lifshitz theory under the assumption that the interactions between a fiber cell and a liquid cell and bet…
BACKGROUND: Tissue-engineered heart valve leaflets are a promising way to overcome the inherent limitations of current prosthetic valves. The aim of this study was to compare the biological responses of an autologous cell seeded scaffold and an acellular scaffold implanted in the pulmonary valve leaflet in the same an…
Crack growth along porous ceramic layers was studied experimentally. Double cantilever beam sandwich specimens were loaded with pure bending moments to obtain stable crack growth. The experiments were conducted in an environmental scanning electron microscope enabling in situ observations of various mechanisms associa…
Conjugated rod molecules bearing flexible coil polymer moieties on both ends self-organize into 1D or 2D structures, and eventually into a 3D tetragonal superlattice (see Figure), depending on the number of monomeric units in the coils. The 3D ordered rods exhibit a highly extended fluorescence lifetime over the 1D or…
By using the fluorescence line-narrowing technique, we observed a broad fluorescence band in the vicinity of a resonant line of the D05→7F0 transition in an Eu3+-doped SiO2 glass synthesized by a sol-gel process. The comparison with a similar line in an Al2O3–SiO2:Eu3+ sol-gel glass revealed the existence of a chemica…
The synthesis and magnetic properties of seven new nitronyl nitroxide substituted phenolates with chelating amine groups are reported. Copper(II) and nickel(II) complexes prepared with these ligands are structurally and magnetically characterized, showing exchange interactions between the metal and the radical ligands…
High-resolution transmission electron microscopy (HRTEM), electron microdiffraction, and X-ray diffraction were used to study hydroxyapatite specimens with particle sizes from a few nanometers to several hundreds of nanometers. Diffuse scattering (without clear reflections in transmission diffraction patterns) or stro…
Surface and textural properties of Zr-doped silica [ x ZrO 2 -(100 − x )SiO 2 ] have been investigated as a function of zirconium content in the range of x = 5 to 50 (mol % Zr) via heating their respective xerogels (prepared with a novel sol−gel route developed recently) in air at 500 °C for 4 h. Nitrogen adsorption−d…
The temperature dependence of tensile fracture behavior and tensile strength of a two‐dimensional woven BN‐coated Hi‐Nicalon™ SiC fiber‐reinforced SiC matrix composite fabricated by polymer infiltration pyrolysis (PIP) were studied. A tensile test of the composite was conducted in air at temperatures of 298 (room temp…
In this work, the dynamic mechanical behavior of jute fiber-reinforced epoxy foams was investigated. The influence of various fiber and microvoid content on shear modulus, frequency and log decrement was discussed. Experimental results showed that the 42 vol.% fiber content significantly enhances the shear modulus. Th…
Abstract A yellow sulfatotungstate complex was formed by heating a 50 mM W(VI)–2 M H2SO4–40% (v/v) CH3CN system at 70 °C for 14 days, being isolated as the tetrapropylammonium (n-Pr4N+) salt. An X-ray structural analysis (ortho-rhombic, Pca21 (No. 29) a = 27.181(1), b = 14.1428(6), c = 27.7292(9) Å, and Z = 4) reveale…
A new route to thermoreversible networks through gelling ferroelectric liquid crystals is presented. A reversible stabilization of one polar state can be achieved. On heating the gel, the network and therewith the polar orientation will be destroyed and on cooling a new polar orientation can be rebuilt. The Figure sho…
Many modem induction motor applications involve nonsinusoidal voltage supply. Under such operating conditions the motor performance can be seriously affected while the standard equivalent circuit is no more adequate for the motor analysis. In this paper, a modified equivalent circuit topology is introduced in order to…
The coupling reaction at the immiscible polymer−polymer interface formed between bilayer films composed of amorphous polyamide (aPA) and polysulfone (PSU) incorporating different functional groups was monitored by X-ray photoelectron spectroscopy (XPS). The overall coupling reaction was consistent with pseudo-first-or…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation B. Wolf, W. J. Frith, Ian T. Norton; Influence of gelation on particle shape in sheared biopolyme…
Lead zirconate titanate (PZT) thin films were prepared on Pt/Ti/Corning 7059 glass substrates by RF magnetron sputtering using a Pb(Zr 0.5 ,Ti 0.5 )O 3 ceramic target. X-ray diffraction studies were performed on the films to optimize the sputtering pressure, O 2 /(Ar+O 2 ) mixing ratio (OMR), annealing temperature and…
We investigate the systematic error due to neglect of elastic scattering of photoelectrons in measurements of the thicknesses of thin films of SiO2 on Si by x-ray photoelectron spectroscopy (XPS). Calculations were made of substrate Si 2p photoelectron currents excited by Mg and Al Kα x rays for different SiO2 thickne…
Reported here are some temperature-dependent and excitation-dependent photoluminescence (PL) results from chlorine-doped ZnSe layers grown by molecular beam epitaxy. The PL spectrum is characterized by an overwhelming exciton recombination emission at 2.797 eV (10 K) near the band edge, and no other PL features are fo…