Materials Literature
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Absorption and fluorescence spectra of commercially available polycrystalline ceramic Nd3+:Y2O3 and nanocrystalline aggregates of Nd3+:Y2O3 grown in our laboratory are optically characterized at nominal 8K and room temperature. In comparing the spectra obtained from these two different sources, we find similarities in…
The enhancement of photoluminescence (PL) is demonstrated from silicon nanocrystals (Si-ncs) by strong coupling of excitons to surface plasmon polaritons (SPPs) supported by a Au thin film. SPPs excited via excitons in Si-ncs were Bragg scattered to photons by one- or two-dimensional gratings, and strong and direction…
We investigate the effect of postgrowth annealing on the magnetic domain structure and magnetization reversal process of (Ga,Mn)As epilayers grown with tensile strain on a (Ga,In)As buffer. In the case of perpendicular magnetic easy axis, annealing drastically changes the domain structure observed at magnetization rev…
The surface roughness of dc magnetron sputtered Al films has been characterized as a function of (a) substrate deposition temperature from 54 to 223 °C, (b) argon sputtering pressure from 1.0 to 9.0 mTorr, and (c) dc magnetron power from 140 to 3590 W corresponding to (d) deposition rates ranging from 0.28 to 7.7 nm/s…
The availability to produce Ti-6Al-4V sheet material with submicron-grained microstructure for superplastic forming (SPF) has been studied. The laboratory scale sheets with an average grain size of 0.3 μm and the commercial size sheets with an average grain size of 0.65 μm were produced by pack rolling manufacturing t…
In this study, superplastic tensile tests were carried out for Ti-6Al-4V alloy using different initial grain sizes (2.6 μm, 6.5μm and 16.2 μm) at a temperature of 920°C with an initial strain rate of 1×10-3 s-1. To get an insight into the effect of grain size on the superplastic deformation mechanisms, the microstruct…
An experimental method for determining the configurational and optical parameters of the liquid crystal (LC) layers with a twisted structure is proposed. This method provides the determination of the twist angle and orientation of LC structures as well as the spectral dependence of the LC layer retardation. These para…
The Raman spectra of silicon carbide (SiC) monofilaments prepared by the chemical vapor deposition method have been investigated as a function of the excitation wavelength. As the excitation wavelength increases from 442 to 785 nm, significant changes in the Raman spectra from the SiC optical phonons are observed. It…
A transparent SiO2–Al2O3–LiF–YF3 glass ceramic doped with Nd3+ was fabricated by melt quenching and subsequent heating. X-ray diffraction and transmission electron microscope results demonstrated that orthorhombic β-YF3 nanocrystals with a mean size of 23nm were homogeneously precipitated among the glass matrix. Confi…
This study presents an experimental investigation on the transport properties of ZnFe2O4−δ (ZFO) thin films to clarify the ambient atmosphere effects on the transport properties by varying the oxygen pressure and the substrate temperature. Previous investigations have demonstrated the significant role of Fe2+ ion conc…
We report here that high energy electron irradiation of multiwalled boron nitride nanotubes can be used to form sharp, crystalline, conical tips, or to cut boron nitride nanotubes by controlling the electron beam size. Electron beam cutting is observed when a focused electron beam with a diameter much smaller than the…
The aim of this study was to estimate the mechanical properties and evaluate the biocompatibility of silk and PGA scaffolds as an artificial ligament to an ACL reconstruction. The scaffold for the artificial ligament was braided / knitted silk or PGA thread. The mechanical properties, cell growth, and subcutaneous tis…
Electron and hole traps in N-doped ZnO were investigated using a structure of n+-ZnO:Al/i-ZnO/ZnO:N grown on a p-Si substrate by metalorganic chemical vapor deposition (for growth of the ZnO:N layer) and sputtering deposition (for growth of the i-ZnO and n+-ZnO:Al layers). Current-voltage and capacitance-voltage chara…
Sb-doped p-type ZnO film was grown on Si (100) substrate by molecular-beam epitaxy. Al/Ti metal was evaporated on the ZnO film to form contacts. As-deposited contacts were Schottky with a barrier height of 0.8 eV. Ohmic conduction was achieved after thermal annealing. The different combinations of Ohmic and Schottky c…
Aligned one-dimensional diluted magnetic semiconductor Zn1−xMnxO nanowires were synthesized from a reaction of metallic Zn foil and MnCl2⋅6H2O under oxygen environment at variant temperatures between 750 and 950 °C by a chemical vapor deposition method. The c-axis preferentially grown nanowire arrays are single crysta…
Through molecular dynamics simulation of nanoindentation of amorphous a-SiC, we have found a correlation between its atomic structure and the load-displacement (P-h) curve. We show that a density profile of a-SiC exhibits oscillations normal to the surface, analogous to liquid metal surfaces. Short-range P-h response…
The magnetocaloric effects (MCEs) in La1−zPrz(Fe0.88Si0.12)13 and their hydrides have been investigated. The values of the MCEs due to the itinerant-electron metamagnetic transition are enhanced significantly by a partial substitution of Pr for La. Furthermore, the Curie temperature TC of the La1−zPrz(Fe0.88Si0.12)13…
In this article, we report the fabrication of an oxygen sensor based on gallium oxide thin films prepared by the chemical solution deposition method. The oxygen sensing properties of the device (response and recovery time, sensitivity, stability) were investigated at high temperature (1000 °C). Attention was paid to t…
Polyurethane foam was fabricated by ‘two-component method’ for changing cell structures. Compression force applied immediately to the polyurethane foam just after complete foam formation at the top of the mold for generation cell structure of negative Poisson effect. That is what we called pressure-controlled method.…
A molecular approach was used for selecting polyhydroxyalcanoate (PHA)-accumulating potential Gram-negative bacteria from different genera by colony polymerase chain reaction (PCR). Three degenerate primers were designed for amplifying a fragment from PHA synthase gene (phaC) (Class I), phaC1 and phaC2 (Class II) gene…