Materials Literature
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A mathematical model is proposed for predicting the copolymer composition of the microbially synthesized polyhydroxyalkanoate (PHA) copolymers. Based on the biochemical reactions involved in the precursor formation and polymerization pathways, the model correlates the copolymer composition with the cultivation conditi…
An explanation is proposed for spontaneous magnetism in the material, ``carbon nanofoam,'' in terms of random ferrimagnetism. Wherever a carbon nanotube branches out, an electron trap is created at the junction. Electrons occupying neighboring junctions align their spins antiparallel. Given that there are more sites o…
Abstract The effect of molecular weight of poly(ε‐caprolactone) (PCL) on the formation and stability of inclusion complexes (ICs) between α‐cyclodextrin (α‐CD) and PCL was investigated by FTIR, WAXD, and DSC measurements. ICs between α‐CD and PCLs with a wide range of number‐average molecular weight, M n = 1.21 × 10 4…
The microstructures and dielectric properties of multilayer ceramic capacitors based on reoxidized Ba(Ti 0.88 ,Zr 0.12 )O 3 (BTZ) materials with Ni electrodes were studied using transmission electron microscopy. Dielectric measurements showed that the BTZ materials exhibited frequency relaxation effects. Although X‐ra…
For potential ultrafast optical sensor application, both VO2 thin films andnanocomposite crystal-Si enriched SiO2 thin films grown on fused quartz substrates weresuccessfully prepared using pulsed laser deposition (PLD) and RF co-sputteringtechniques. In photoluminescence (PL) measurement c-Si/SiO2 film containsnanopa…
Silicon nitride–silicon carbide nanocomposite has been prepared by an in situ method that utilizes C+SiO 2 carbo‐thermal reduction during the sintering process. The developed material is nearly defect free and consists of a silicon nitride matrix with an average grain size of approximately 200 nm with inter‐ and intra…
Abstract Nylon 6,6 resins, in the form of pellets, were solid state polymerized in the temperature range of 160–200°C in a fixed‐bed reactor under flowing nitrogen for times of 0–4 h. The kinetics of the solid state polymerization (SSP) of nylon 6,6 were examined by the evaluation of pertinent rate expressions and the…
The progress in the preparation of metastable Fe-Cu alloys has recently enabled the experimental determination their magnetic and volume related properties over a wide range of alloy compositions. In this paper we discuss the results of these experiments on the basis of our first-principles calculations. The origin of…
A numerical simulation study of the intersection process of a moving ½[110] screw dislocation with a perfect stacking-fault tetrahedron (SFT) in an fcc nickel crystal is carried out using molecular dynamics for different many-body potentials. When the glide plane of the screw dislocation coincides with one of the plan…
Flexure strength and fracture toughness of zirconia–alumina composites, fabricated by hot pressing 10 mol% yttria‐stabilized zirconia (10‐YSZ) reinforced with 0–30 mol% alumina particulates or platelets, were determined as a function of alumina content at 1000°C in air. Both strength and fracture toughness of the two…
Abstract The optimization of the synthesis of poly( p ‐dioxanone), by ring‐opening polymerization with tin II bis(2‐ethylhexanoic acid) as the catalyst, was conducted by a new method in which programmed decreasing reaction temperatures were employed. The results were compared with those obtained for polymerization rea…
Particle rotations, and in particular, rolling resistance are known to have a dominant influence on the macroscopic behaviour of particulate materials. We examine the influence of these factors in the constitutive response of a semi-infinite material to indentation by a rigid flat punch on the material boundary. Exten…
Time-dependent adsorption behavior of poly(3-hydroxybutyrate) (PHB) depolymerase from Ralstonia pickettiiT1 on a polyester surface was studied by complementary techniques of quarts crystal microbalance (QCM) and atomic force microscopy (AFM). Amorphous poly(l-lactide) (PLLA) thin films were used as adsorption substrat…
We present a first theoretical evaluation of a new optical technique for diffraction grating metrology. While well-known spectroscopic ellipsometry (SE) is based on classical ellipsometric spectra taken in the usual planar diffraction geometry, we propose to use spectrally resolved full Mueller matrices of the grating…
Microemulsions are effective media for solution-based synthesis of metallic nanoparticles where surfactants and other ionic species influence the directed assembly of the nanomaterials with specific sizes, geometries, and compositions. This study demonstrates the effects of chloride ion on the synthesis of copper nano…
The geometry of {001} surfaces of spinel (MgAl 2 O 4 ) was investigated by first‐principles simulations within density‐functional theory (DFT). The calculations show that the structure relaxation or reconstruction occurs for a depth of about 0.5 nm. The (001)‐Mg surface shows moderate relaxations and the (001)‐Al surf…
A phase diagram of temperature versus strain was constructed for a (001)‐oriented PbZr 1− x Ti x O 3 epitaxial single crystal thin film near the bulk morphotropic boundary composition ( x =0.47) on an (001)‐oriented cubic substrate. The phase‐field approach is employed. It is shown that a mixture of distorted rhombohe…
Although nowadays the so-called environmental scanning electron microscopes (ESEMs) allow the observation of the samples without metal or carbon coating, many conventional scanning electron microscopes (SEMs) are still in use. On the other hand, the presence of erythrocytes (red blood cells, RBCs) in a smear is consid…
A qualitative and quantitative analysis of the microtexture/microstructure in several experimental boron nitride fibers was investigated by X‐ray diffraction and electron microscopy according to their mechanical properties. Young's modulus was controlled by grain orientation. The disordered microstructure of low modul…
Ce 0.9 Gd 0.1 O 2− x (CGO) layers were deposited onto nonconductive porous NiO–CGO supports by electrophoretic infiltration, and then compacted by isostatic pressing to achieve a high packing density of the deposited layer. The bilayers were sintered to give dense CGO layers at 1290°C in air. A fuel cell comprising an…