Materials Literature
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The ultrasound (363 kHz) induced decomposition of a commercially available polydisperse nonylphenol ethoxylate surfactant (Teric GN9) has been investigated. The initial rate of decomposition was found to be a function of the monomer concentration of the surfactant below and above the critical micelle concentration. Ba…
We have demonstrated the integration of various morphologies generated by dynamic oblique deposition, during which the deposition angle and the azimuth of the substrate are varied. The layers with zigzag, helicoidal and cylindrical columns have been successfully stacked on a substrate without using any etching process…
Electrospinning is a unique process that is capable of producing fibers with diameters ranging over several orders of magnitude, from the micrometer range typical of conventional fibers down to the nanometer range. Electrospun fibers possess unusually large surface-to-volume ratios and are expected to display morpholo…
In the paper a digital technique for improving the accuracy of instrument current transformers is presented. Since the exciting current can be considered as the main error source, its evaluation can allow the compensation of its detrimental effects to be obtained. The exciting current required by the transformer in ev…
A measuring apparatus based on a phase shifting interferometry technique to determine the mechanical properties of metal oxide films was presented. Thin films were prepared by ion-beam sputter deposition at low substrate temperature. Quantitative determination of the mechanical properties such as the internal stress,…
Crystallographic and low frequency dielectric studies were performed on lead-free non-stoichiometric perovskite ceramics of Ba1—xBi2x/3□2x/3TiO3 (0 ≤ x ≤ 0.15) composition. A classical ferroelectric behaviour was shown for x lower than 0.09. A relaxor behaviour appears for higher values of x (0.09 ≤ x ≤ 0.15). The cor…
Calorimetric measurements were made on natural samples of heulandite having the composition Ca 0.86 Na 0.37 K 0.06 Al 2.14 Si 6.86 O 18 ·6.1H 2 O and stilbite Ca 1.01 Na 0.12 Al 2.12 Si 6.88 O 18 · 7.27H 2 O both from the same locality (Nidym River, E. Siberia, Russia). Enthalpies of formation and hydration were studi…
Hi‐Nicalon fiber‐reinforced silicon carbide matrix minicomposites (Hi‐Nicalon/SiC) with nanoscale multilayered (PyC/SiC) n fiber coatings (also referred to as interphases) have been manufactured via pressure pulse chemical vapor infiltration (P‐CVI). Fiber/coating interfaces were strengthened by using treated fibers.…
Composites were prepared from waste wood flour, sisal fiber and polypropylene (PP). The surface of the filler was modified to enhance the chemical affinity between hydrophilic cellulosic and hydrophobic polymer. The treatments studied were: a) The addition of a coupling agent; b) chemical treatment with NaOH; and c) t…
In this paper we present the development of a composite magnetostrictive material for automotive applications. The material is based on cobalt ferrite, CoO⋅Fe2O3, and contains a small fraction of metallic matrix phase that serves both as a liquid-phase sintering aid during processing and enhances the mechanical proper…
Polymerase is a central enzyme involved in the biosynthesis of polyhydroxybutyrate (PHB), a well-known bacterial biodegradable polyester. In this study, we have established an in vivo assay system to analyze mutational effects of Ralstonia eutropha polymerase (termed PhbC(Re)) on the level of PHB accumulation in recom…
Changes in crystal structure of ettringite on dehydration in normal atmosphere have been re-examined by means of thermogravimetry, X-ray diffraction, and 27 Al nuclear magnetic resonance spectroscopy. Synthetic ettringite crystals were heated at various temperatures up to 200°C for durations of up to 7 h. The ettringi…
Using intrinsic viscosity, static light scattering (SLS), and dynamic light scattering (DLS), we demonstrated that the particle sizes of chitosan molecules in dilute acetic acid/water solutions increased with decreasing pH value. SLS data also demonstrated that the second virial coefficient (A2) increased with decreas…
ABSTRACT Edible films of starch‐alginate (SA), starch‐alginate‐stearic acid (SAS), SA‐tocopherol, SAS‐tocopherol, tocopherol‐coated SA film, and tocopherol‐coated SAS film were evaluated for their effectiveness in maintaining quality of precooked beef patties stored at 4 °C. Patty weight loss, moisture loss, 2‐thiobar…
Abstract In attempts to produce modified poldified polyethlene terephthalate (PET) ressins with improved rheology for applications requiring high viscosity and elasticity (e.g., lowdensity extrusion foaming, extrusion blow molding), a novel dimidodiepoxide of low molecular weight was evaluated aschain extender/branchi…
Thin film coolers can provide large cooling power densities compared to bulk thermoelectrics due to the close spacing of hot and cold junctions. Important parameters in the design of such coolers are investigated theoretically and experimentally. A three-dimensional (3D) finite element simulator (ANSYS) is used to mod…
Alternating monolayers of tetrathiafulvalene and polyoxometalate clusters (see Figure) are assembled here to form hybrid Langmuir–Blodgett (LB) films. The synthetic strategy used is promising for creating multilayer structures comprising two different types of functional units that can impart an interesting combinatio…
RhO2 belongs to the family of conducting platinum group metal oxides, which have attracted attention as new capacitor electrode materials for dynamic random access memories (DRAMs) and nonvolatile ferroelectric random access memories (FeRAMs). Rh, Rh2O3, and RhO2 thin films were prepared by sputtering and their XPS sp…
The simultaneous addition of 0.5 wt% Cr and Fe was found to enhance the densification of TiB 2 . The densities of specimens that were sintered for 2 h at 1800° and 1900°C were 97.6% and 98.8% of the theoretical value, respectively. The mechanical properties of the specimen sintered at 1800°C, which had a strength of 5…
A highly active, three-dimensional, mesoporous titanosilica, TiTUD-1, with comparable properties to Ti-grafted mesoporous silica MCM-41, has been prepared in a one-step synthesis. A non-surfactant chemical, triethanolamine, was used as a template molecule. Triethanolamine easily forms complexes with titanium alkoxides…