Materials Literature
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First order Raman spectra in the region 200–800 cm−1 have been collected for AMn2O4 (A = Mn, Mg and Zn) tetragonal spinels. A possible correlation between Raman phonons and AO4 and MnO6 unit vibrations is proposed. Structural changes have been analyzed following the evolution of the Raman spectra with x for the Mg1−xM…
The magnetic and transport properties of the Cr-doped manganites ${\mathrm{La}}_{0.46}{\mathrm{Sr}}_{0.54}{\mathrm{Mn}}_{1\ensuremath{-}y}{\mathrm{Cr}}_{y}{\mathrm{O}}_{3}$ ( $0\ensuremath{\le}y\ensuremath{\le}0.08$) with the $A$-type antiferromagnetic structure were investigated. Upon cooling, we find multiple magnet…
A three-dimensional discrete dislocation dynamics plasticity model is presented. The approach allows realistic boundary conditions on the specimen, as both stress and displacement fields of the dislocations are incorporated in the formulation. Emphasis is placed on various technical details in the formulation as well…
The fracture of carbon nanotubes is studied by molecular mechanics simulations. The fracture behavior is found to be almost independent of the separation energy and to depend primarily on the inflection point in the interatomic potential. The fracture strain of a zigzag nanotube is predicted to be between 10% and 15%,…
Monodisperse magnetite nanoparticles have been synthesized by high-temperature solution-phase reaction of Fe(acac)3 in phenyl ether with alcohol, oleic acid, and oleylamine. Seed-mediated growth is used to control Fe3O4 nanoparticle size, and variously sized nanoparticles from 3 to 20 nm have been produced. The as-syn…
The Idaho National Engineering and Environmental Laboratory (INEEL) Advanced Test Reactor (ATR), a DOE Category A reactor, was designed to provide an irradiation test environment for conducting a variety of experiments. The ATR Safety Analysis Report, determined by DOE to meet the requirements of 10 CFR 830, Subpart B…
Abstract 1 H wideline and 13 C magic‐angle spinning NMR have been used to study the morphology and dynamics of latex‐cast and solution‐cast film blends of natural rubber (NR) and a polyurethane (PU) based on poly(ϵ‐caprolactone) diol and isophorone di‐isocyanate. 1 H T 1 and T 1ρ relaxation times have been measured, a…
Abstract The lower critical solution temperature (LCST) properties and hydrolytic behaviour of thermosensitive biodegradable polyphosphazenes with monomethoxy‐poly(ethylene glycol), glycine ethyl ester and depsipeptide ethyl esters substituents have been studied. All the polymers synthesized show LCST properties. The…
[reaction: see text] The first synthesis of dendralene-type TTF derivatives bearing a 1,3-ditellurole ring has been achieved. Preliminary electrochemical results are presented.
Diaminopyridine (DAP) functionalized POSS derivatives self-assemble on thymine functionalized monolayers on gold surfaces affording hybrid inorganic/organic surfaces.
Etch pits on highly oriented pyrolytic graphite (HOPG) were used as templates for the formation of gold nanostructures, which were characterized using STM (scanning tunneling microscopy), AFM (atomic force microscopy), XPS (X-ray photoelectron spectroscopy) and TOF-SIMS (time-of-flight secondary ion mass spectrometry)…
Silver−vanadium pentoxide composite films have been fabricated by 355-nm pulsed laser reactive deposition on stainless steel substrates. XRD and SEM analyses showed that the composite films Ag x V 2 O 5 ( x = 0.1−0.5) deposited at a substrate temperature of 300 °C in the presence of ambient 100 mTorr O 2 for 0.5 h wer…
The preparation, X-ray crystal structures, and magnetic properties of two new isostructural charge transfer salts, (BDH-TTP)M(isoq)(2)(NCS)(4) (M = Cr(III) (1), Fe(III) (2), BDH-TTP = 2,5-bis(1,3-dithiolan-2-ylidene)-1,3,4,6-tetrathiapentalene, isoq = isoquinoline), are reported. Crystal data for 1: monoclinic, space…
The Japanese ceramic gas turbine (CGT) research and development program (FY1988-1998) as a part of the New Sunshine Project funded by the Ministry of International Trade and Industry (MITI) was completed in March 1999. Kawasaki Heavy Industries, Ltd. (KHI) participated in this research program from the beginning and d…
Abstract Magnesium hydroxide‐based halogen‐free flame retarded linear low density polyethylene composites containing poly(ethylene‐ co ‐propylene) elastomer were prepared in the melt process and subsequently vulcanized thermally. Influences of the elastomer on the mechanical properties, combustion characteristics and…
Abstract Oxide formation on magnetron‐sputtered thin copper films (35 nm thickness) was studied by x‐ray reflectometry and grazing incidence x‐ray diffraction. The films were oxidized in air at temperatures of 175° C, 200° C, 225° C and 250° C. The reflectometry and the diffractometry data indicate the formation of Cu…
Morphological characteristics and mechanical properties of a series of block-double-graft (BDG) copolymers and terpolymers polystyrene−[1,2-polybutadiene- g -X 2 ] (X = 1,4-polybutadiene, polyisoprene, polystyrene, and polystyrene- b -polyisoprene diblocks) were investigated by transmission electron microscopy (TEM),…
Abstract In this paper, several drug carriers were fabricated to release the hydrophilic 5‐fluorouracil (5‐Fu), such as blend of polylactide (PLA) with different molecular weights and blends of PLA with polycaprolactone (PCL) or poly(ethylene glycol) (PEG). The controlled release devices were processed into tablets co…
General Electric has developed SiC fiber-reinforced SiC-Si matrix composites produced by silicon melt infiltration for use in gas turbine engine applications. High temperature, high-pressure combustion rig testing, and engine testing has been performed on combustor liners and turbine shrouds made from such MI composit…
The environments for oxygen sites in crystalline V(2)O(5) and in layered vanadia gels produced via sol-gel synthesis have been investigated using (17)O MAS and 3QMAS NMR. For crystalline V(2)O(5), three structural oxygen sites were observed: V=O (vanadyl), V(2)O (doubly coordinated), and V(3)O (triply coordinated). Li…