Materials Literature
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This study focuses broadly on synthesis and characterization of porous mullite/alumina mixtures for use as matrices in oxide fiber composites. Specifically, an assessment is made of the utility of a precursor‐derived alumina (PDA) in controlling both the modulus and the toughness of mullite‐rich particle mixtures. Pro…
Abstract The transformation process between palygorskite and smectite was studied by examining the morphological and structural relationships between these two minerals in an assemblage from the Meigs Member of the Hawthorne Formation, southern Georgia. Studied samples were related to an alteration horizon with a tan…
We determined near-infrared (NIR) molar absorptivities of hydroxyl group (4500 cm -1 ) and molecular water (5230 cm -1 ) in rhyolitic glasses at room temperature and at high temperature, 400.600 °C. Five rhyolitic glasses with 0.5.2.8 wt% total water were analyzed by FT-IR microspectroscopy at room temperature and at…
With increasing applied voltage, three types of anodic coatings, passive film, micro-spark ceramic coating and spark ceramic coating were made by micro-arc oxidization (MAO) technique on AZ91D magnesium alloy in alkali-silicate solution. The structure, composition characteristics and the electrochemical properties of…
Colloidal suspension of monodispersed charged polystyrene microspheres provides an excellent experimental system for a study of condensed matter physics. Here we report a series of experiments using video microscopy to study the structure and dynamics of colloidal matter. In the first set of experiments, we give a cle…
Abstract Multinuclear ( 13 C, 29 Si, 11 B, 1 H) solid‐state NMR and EPR spectroscopy are employed to study the thermolysis of boron‐modified poly(allylmethylsilazane), [B{C 3 H 6 ‐Si(CH 3 )NH} 3 ] n , from which a quaternary Si‐C‐B‐N ceramic is formed. The investigations are primarily focused on the characterization o…
A plasma-catalytic combined reactor system was used to decompose volatile organic compounds. Metal oxide catalysts, as well as Pt-based catalyst, were employed in the studies. The plasma treatment alone leads to the formation of high concentration of byproducts. A Pt-based catalyst, combined with plasma reactor, was h…
Abstract This work describes different models, developed by the Thermochemical Power Group at the University of Genoa (Italy), for the simulation of solid oxide fuel cell and gas turbine hybrid systems. The paper focuses on both “cores” of the system: the fuel cell stack on the one hand and the turbomachinery and the…
Poly-(R)-3-hydroxybutyric acid (PHB) was synthesized anaerobically in recombinant Escherichia coli. The host anaerobically accumulated PHB to more than 50% of its cell dry weight during cultivation in either growth or nongrowth medium. The maximum specific PHB production rate during growth-associated synthesis was app…
Interest in hydrotalcite-like compounds has grown due to their role in controlling the mobility of aqueous metals in the environment as well as their use as catalysts, catalyst precursors, and specialty chemicals. Although these materials have been studied in a number of contexts, little is known of their thermodynami…
Abstract Fe-rich kaolinites were synthesized at 225°C in distilled water from gels with different Fe/Al ratios (0.15, 0.25, 0.35) and with Si/(Al + Fe) = 2. X-ray diffraction patterns of the reaction products showed that kaolinite was the only long-range crystalline phase synthesized. Analytical electron microscopy an…
The photophysical and photochemical properties and quenching (by 1,4-benzoquinone) of metallophthalocyanine sulfonates of aluminium ( AlPcS mix ), zinc ( ZnPcS mix ), silicon ( SiPcS mix ), germanium ( GePcS mix ) and tin ( SnPcS mix ) are presented. The quantum yield values of fluorescence (Φ F ), triplet state (Φ T…
Botanists recognize only two kinds of New Zealand flax ( Phormium tenax and Phormium colensoi ), while Māori weavers recognise over fifty different cultivars that have specific end-uses. Selected properties of muka 4 (sclerenchyma fiber aggregates extracted from harakeke ( P. tenax )) from three of these cultivars (Ar…
Abstract Potassium (K) release from sources that are not initially exchangeable is attributed to depletion of interlayer K of micas and clay minerals or weathering of feldspars. The aim of the present study was to estimate the K release from interlayer K. Soil samples from 17 field experiments in ley on a range of min…
The room temperature phase diagram of PLZT, (Pb,La)(Zr,Ti)O 3 , or L / Z / T for L <12 and T <10 was constructed using X‐ray diffraction patterns of sintered and crushed PLZT material. The orthorhombic antiferroelectric phase, a tetragonal phase, the rhombohedral (hexagonal) ferroelectric phases, and the mixed L…
JERK is a Kinetic Monte Carlo model which aims at describing the evolution of materials under irradiation over large time and length scales. The evolution is calculated by collecting only those events which actually modify the objects making up the microstructure (defect clusters, various complexes, dislocations), by…
ABSTRACT Fouling is a common food industry‐wide issue during thermal treatment using heat exchangers. It directly contributes toward increased energy costs in operation and maintenance, production losses and energy and water losses because of the repetitive cleaning operation, i.e., every 5–10 h in fluid food industry…
Nanocrystalline CdS particles directly conjugated with bovine serum albumin (BSA) protein were prepared by applying the supercritical fluid processing technique, rapid expansion of a supercritical solution into a liquid solvent. The direct conjugation takes advantage of the unique features of the process for nanoparti…
The interband transition contributions to the optical properties of silver nanoparticles in fluoropolymer matrices are investigated. For the materials in this study, nanoparticle synthesis within the existing polymer matrix is accomplished using an infusion process that consists of diffusing an organometallic precurso…
This study focuses on efforts to characterize aging occurring in 15 kV distribution cables in a dry climate. It has been shown that similar changes can be produced by a suitably planned accelerated thermal aging testing in the laboratory. The Arrhenius equation is used for establishing the accelerated aging test param…