Materials Literature
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Material microstructure is a significant determinant of the tensile stress at which materials fail. Using a high-energy laser to drive shocks in thin slabs, we have explored the role material microstructure plays on the spall strength of high-purity and alloyed aluminum at strain rates of (2–7.5)×106s−1. Slabs of pure…
The hydrogen embrittlement susceptibility of high strength TRIP/TWIP steels with the tensile strength of 600Mpa to 900Mpa grade was investigated using cathodically hydrogen charged specimens. TWIP steels with full austenite structure show a lower hydrogen content than do TRIP steels. The uniform distribution of strong…
The Ruddlesden-Popper series of compounds La n+1 Ni n O 3n+1 are one of the strongly correlated electron systems. Among these compounds, La 2 NiO 4 ( n =1) is a well-known two-dimensional antiferromagnetic insulator. Electrical resistivity under high pressure have been measured on R 2-x Sr x Ni 1-y Cu y O 4+δ (R=La, N…
Tungsten-containing diamondlike carbon (W-DLC) coatings have been deposited on FKM (fluorocarbon), ACM (acrylate), and HNBR (hydrogenated nitrile butadiene) rubbers via unbalanced magnetron reactive sputtering from a WC target in C2H2/Ar plasma. The surface morphology and fracture cross sections of coated rubbers have…
X-ray absorption near-edge structure (XANES) and x-ray emission spectroscopy (XES) measurements were used to investigate the effect of Mg doping in ZnO nanorods. The intensities of the features in the O K-edge XANES spectra of Zn1−xMgxO nanorods are lower than those of pure ZnO nanorods, suggesting that Mg doping incr…
Based on the temperature behavior of the entropy increment induced by the probing electric field in the isotropic phase of mesogenic compounds belonging to the homologous series C(n)H(2n+1)PhCOOPhCN ( n = 4-10), it is found that an ability to the dipolar aggregation of the molecules depends on the alkyl tail length, a…
Solid state nuclear magnetic resonance (NMR) methods have been used to investigate the effect of H content on the structure of sputtered hydrogenated amorphous carbon a-C:H films. Carbon-13 NMR spectra of a-C:H consist of two broad peaks at 135 and 40 ppm, which correspond to the sp2 and sp3 carbons, respectively. Sur…
State-of-the-art calculations of electronic band structures, density of states and frequency-dependent optical properties have been reported for Sr n +1 Ti n O 3 n +1 ( n =1, 2, 3, ∞) compounds. These materials possess indirect wide energy band gaps. The frequency dependent optical properties of n =1,2,3 compounds sho…
Ferroelectric ternary perovskite thin films of 0.06Pb(Mn1/3,Nb2/3)O3 (PMnN)−0.42PbZrO3 (PZ)−0.52PbTiO3 (PT) [0.06PMnN–0.94PZT(45/55)] have been grown on the (001)MgO substrates by radio frequency-magnetron sputtering with quenching processing. The deposition conditions, microstructures, piezoelectric, and ferroelectri…
Mass-selected cluster deposition was used to investigate the chemical and thermal properties of the Mo 4 S 6 cluster deposited onto a Au(111) substrate. Auger spectroscopy and (13) CO thermal desorption measurements demonstrate that the clusters behave independently up to coverages of ∼0.15 ML, while at higher coverag…
A simplified angle-polytopic multiplexed holographic drive is presented. By putting both beams through one lens, using lens motion to achieve angle multiplexing, and using a grating to achieve phase conjugation, a holographic drive size and cost can be reduced dramatically.
The crystal structure of mayenite (ideal composition: Ca12Al14O33) consists of a (disordered) calcium-aluminate framework comprising 32 of the 33 oxygen anions. It contains large open cages, 1/6 of them being filled randomly by the remaining “free” oxygen which is available for diffusion and very high ionic conductivi…
Here we report the synthesis of new B-rich phase, boron subnitride B 13 N 2 by crystallization from the B-BN melt at 5 GPa. The structure of B 13 N 2 has been resolved by the Rietveld analysis and represents a new structural type formed by the distorted boron icosahedra linked together by N-B-N chains and inter-icosah…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTDiffusion in Polymer Blends by Raman MicroscopyA. C. De Luca†‡, G. Rusciano*†‡, G. Pesce†§, S. Caserta⊥, S. Guido⊥, and A. Sasso†‡View Author Information Dipartimento di Scienze Fisiche, Università di Napoli Federico II, Via Cinthia…
Abstract Nickel oxide nanoparticles and nanoflowers have been synthesized by a soft reaction of nickel powder and water without organics at 100 °C. The mechanism for the formation of nanostructures is briefly described in accordance with decomposition of metal with water giving out hydrogen. The structure, morphology,…
The classical method for measuring the inherent periodicity, or “pitch”, in the order parameter in a cholesteric liquid crystal implies using a wedge cell with well‐defined boundary conditions. But the error can be large due to difficulties in controlling the wedge angle, α. A modified method is presented that signifi…
Hollow ZnSe microspheres were successfully synthesized by a simple chemistry vapor deposition method in a horizontal tube furnace. The as-obtained samples were characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, and energy-dispersive X-ray spectrometry. Th…
A mathematical model for the performance of a radial-flow moving-bed reactor for dehydrogenation of light paraffins was developed. Assuming relevant kinetic expressions for the main reaction and catalyst deactivation, the kinetic parameters were obtained through lab-scale fixed-bed reactor testing using the integral m…
The interaction strength of sodium ions (Na(+)) with cellulose is investigated from first principles for varying degrees of water content. We find that the interaction of water molecules and Na(+) can be studied independently at the various OH groups in cellulose which we categorize as two different types. In the abse…
We report on the nanofabrication of patterned silver particle arrays using electron-beam lithography and the evaluation of their optical properties using backscattering and fluorescence spectroscopy. The silver particles varied in size from 100 to 250 nm and were in the shape of circles, squares, and triangles. Three…