Materials Literature
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The activation behaviors and hydrogen storage properties of the Laves phase Ti1−xZrx (Mn0.5 Cr0.5)2(x =0, 0.1, 0.2, 0.32, 0.5) alloys were investigated by the pressure-composition-temperature (P-C-T) measurements. All the studied alloys show the single C14-type Laves phase structure based on the XRD data. Except for t…
Based on the reaction products of ethylenediaminetetraacetic acid (EDTA) with 1,2-phenylenediamine (o-PDA), a novel thermal decomposition pathway of EDTA is proposed. The strong acidic medium and the presence of o-PDA facilitate the decomposition of EDTA as evidenced by the relatively lower reaction temperature. In ad…
Visible laser irradiation of AgOx thin films forms Ag nanoparticles, which then results in surface-enhanced Raman scattering (SERS). The efficiency of this Ag nanoparticle formation strongly depends on the properties of the AgOx thin films. Thermal annealing causes changes in physical properties such as deoxidization…
Compositional variation of the lattice parameters of TlBX2-type (B = Ga or In and X = S or Se) mixed crystals with monoclinic structure were studied by X-ray diffraction technique. The lattice anisotropy (c/b) of these mixed crystals changes linearly with substitution of the atoms located both at the centers and the v…
Maleated ethylene-propylene diene monomer rubber (MAH-g-EPDM) was prepared on a two-roll mill and tested as a compatibilizer for EPDM/NBR (butadiene-acrylonitrile rubber) blend. Intrinsic viscosity measurements and scanning electron microscopy revealed that MAH-g-EPDM improved the compatibility and morphology of EPDM/…
Industries including semiconductor, biotechnology, and nanotechnology are seeking compact and reliable nanometer resolution positioning techniques. To address this demand, this article presents a friction-drive rotary stage driven by a piezoelectric transducer (PZT) actuator. This stage includes a multilayer PZT actua…
Mg-20wt. % Fe 23 Y 8 composite was successfully prepared by reactive mechanical alloying (RMA). X-ray diffraction (XRD) measurement shows that the main phases of composite are MgH 2 and Mg 2 FeH 6 . The composite exhibits excellent hydrogen abs/desorption properties and can absorb 4.36wt. % and 5.72wt. % hydrogen at 4…
This paper focuses on the insulation properties of nanocomposites, which are evaluated under divergent and homogeneous electric fields. Epoxy nanocomposites were made by dispersing nano-fillers. Various kinds of nano-fillers were used, such as layered silicate, silica and titania. Insulation breakdown tests by needle-…
A caged molecule is an inert but photosensitive molecule that is transformed by photolysis into a biologically active molecule at high speed (typically 1 msec). The process is referred to as photorelease. The spatial resolution of photorelease is limited by the properties of light; submicrometer resolution is potentia…
Pressure-chamber and free-field measurements of high sensitivity piezoelectret microphones of two different designs are reported. High sensitivity is achieved by (1) an increase of the piezoelectric d33-coefficient of the cellular polypropylene films by a pressure expansion procedure and (2) stacking of the films. The…
Various technology programmes in Europe are concerned with preparing for future propulsion technologies to reduce the costs and increase the life time of components for liquid rocket engine components. One of the key roles to fulfil the future requirements and for realizing reusable and robust engine components is the…
A new variety of matrices based on synthetic phases whose structure is close to that of murataite (a natural mineral) is proposed for immobilization of nuclear wastes. Murataite is Na, Ca, REE, Zn, and Nb titanate with a structure derived from the fluorite lattice. This very rare mineral was found in alkali pegmatites…
Fe3O4 nanoparticles were prepared by chemistry co-precipitation and the mean crystal size was 17.9 nm measured by XRD. After it had been treated by silane-coupling agents KH570, magnetic microspheres dispersed in organic medium glycol were gained and the mean size of Fe3O4 nanopowders was 33.7 nm. So it can be conclud…
Organic insulating materials have been widely used in electrical and electronic equipments and a large number of papers have been published for the past several decades. However, the behavior of charge carriers in organic insulating polymers is not well understood yet because insulating polymers have complicated physi…
Defect production and amorphisation due to energetic uranium recoils in zircon (ZrSiO4), which is a promising ceramic nuclear waste form, is studied using molecular dynamics (MD) simulations with a partial charge model. An algorithm that distinguishes between undamaged crystal, crystalline defects and amorphous region…
We report the application of solution- and vapor-phase siloxane-based methods for tailoring the surface chemistry/properties of highly porous, nanostructured thin films fabricated using glancing angle deposition (GLAD). The GLAD technique produces high surface area films consisting of isolated columns and provides com…
A nano-composite material of magnesium oxide (MgO) added to a low-density polyethylene (LDPE) was subjected to electrical tree breakdown investigation. The LDPE without nano-fillers was lower in breakdown voltage than the LDPE added with nano-fillers. The breakdown voltage was increased by increase of nano-filler conc…
A novel diamine, 3,3‘-bis( N -aminophthalimide) (BAPI), was prepared from 3,3‘-bis( N -phenylphthalimide). Its structure was determined via IR, 1 H NMR, 15 N NMR, elemental analysis, and single-crystal X-ray diffraction analysis. A series of homo- and copolyimides were synthesized by a conventional one-step method in…
Abstract Melt‐crystallized films of poly( L ‐lactic acid) (PLLA) with M v in the range of 3.8 ∼ 46 × 10 4 consisting of α‐form crystals were uniaxially drawn by solid‐state coextrusion. The effects of M v , extrusion draw ratio (EDR), and extrusion temperature ( T ext ) on the crystal/crystal transformation from α‐ to…
We report the enhancement of electric and fatigue-endurance properties of vanadium-doped SrBi4Ti4O15 (SBTi) thin films deposited by a refined sol-gel method. The structures and surface morphologies of the films were characterized by x-ray diffraction, atomic force microscopy, and scanning electron microscopy. Their el…