Materials Literature
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Using the time-dependent LDA method, we investigate the tunability of the optical polarizability of small metallic nanoshells. We show that the energies of the two dipolar plasmon resonances vary with the ratio of shell thickness to particle radius in a manner similar to what has been predicted using classical Mie sca…
Radiation rates and emission quantum yields of Eu(III) were modified using asymmetric deuterated Eu(III) complexes doped in poly(methyl methacrylate) (PMMA) deuterated tris-(hexafluoroacetylacetonato)europium(III) with phospine oxide in order to produce lowthreshold levels for laser transmission and amplifier emission…
The first-order Raman spectra of the transition metal dioxide OsO 2 with tetragonal rutile structure have been measured at room temperature. A linearly polarized argon laser light source and completely oriented single-crystal samples have made possible unambiguous determination of the four allowed Raman-active phonon…
To date, no off-the-shelf graft has performed better than the autologous vessel in applications requiring small-bore (< 6-mm diameter) vascular grafts. Much research has been devoted to seeding endothelial cells on synthetic grafts to improve their long-term clinical performance. One key challenge is the ability to re…
The structures of two ion-pair complexes, which consist of 1-(4′-R-benzyl)pyridinium (R = NO2 (1), Br (2)) and bis(maleonitriledithiolato)cuprate(II), have been determined by X-ray single crystal analyses, and the results show the stacking patterns in 1 and 2 are different from each other although the difference betwe…
The Raman scattering spectrum of the sodium niobate crystal, in both P and R phases, has been investigated from room temperature up to 440 ° C. The dependence of the low-frequency (LF) spectrum clearly reveals, for the first time, over a wide temperature range, the presence of a strong quasi-elastic scattering below a…
A Landau–Ginzburg thermodynamic model is constructed and used to develop a methodology for analyzing temperature-graded ferroelectrics. Spatial nonuniformities in temperature are shown to give rise to nonuniformities in polarization with corresponding spatial variations. The magnitude and the sign of the polarization…
The mixed alkali borate glasses $xNa_2O-(30 - x)K_2O-70B_2O_3$ (5 \\leq x \\leq 25, doped with 0.5 mol% of CuO, have been investigated, using electron paramagnetic resonance (EPR) and optical absorption techniques, as a function of mixed alkali content, to look for the 'mixed alkali effect' (MAE) on the spectral prope…
In tissue engineering related to the regeneration of damaged or lost tissue, excellent biodegradable materials are desired as temporary scaffolds to support cell growth and then disappear with the progress of tissue regeneration. We previously synthesized biodegradable poly(depsipeptide-co-lactide), poly[(Glc-Asp)-co-…
The behavior of grain boundary sliding in pure and yttrium-doped Al2O3 was directly measured at a high temperature, using bicrystal experiments. For this purpose, we fabricated Al2O3 bicrystals containing a random grain boundary with or without yttrium ions. High-resolution transmission electron microscopy observation…
We have investigated the effect of additional doping by Be on the properties of Ga1−xMnxAs (x=0.03). For this relatively low value of x, the Curie temperature is observed to increase with increasing Be concentration. We show that the temperature dependence of the resistivity at zero magnetic field, including the resis…
The properties of phase-separated systems, e.g., manganites close to a first-order phase transition between charge-ordered insulator and ferromagnetic metal, are usually described by percolation picture. We argue that the correlated occupation of metallic sites leads to the preferential formation of larger metallic cl…
We demonstrate the formation of ferromagnetic Ga1−xMnxAs films by Mn ion implantation into GaAs followed by pulsed-laser melting. Irradiation with a single excimer laser pulse results in the epitaxial regrowth of the implanted layer with Mn substitutional fraction up to 80% and effective Curie temperature up to 29 K f…
The lattice location of rare-earth Er167m in single-crystalline hexagonal ZnO was studied by means of the emission channeling technique. Following 60-keV, room-temperature implantation of the precursor isotope Tm167 at doses of 1.3–2.8×1013 cm−2 and annealing up to 900 °C, the angular distribution of conversion electr…
We study the onset of yielding in stable three-dimensional dry foams following the start up of steady shear flow. By means of a charge-coupled device camera equipped with a small depth-of-field objective, we visualize the Plateau border network in the bulk of the foam. The onset of yielding is identified with the defo…
A multiscale analysis of fixed-end simple shear using molecular dynamics, crystal plasticity, and a macroscopic internal state variable theory, M F Horstemeyer, M I Baskes, V C Prantil, J Philliber, S Vonderheide
Long-range ordered arrays of anodic alumina nanochannels are grown by anodizing an aluminum covered with a patterned layer of polymethylmethacrylate (PMMA) resist. The two-dimensional hexagonal-closed-packed pattern is created by focused ion beam (FIB) exposure of the PMMA and transferred onto the aluminum surface by…
We report on the photomagnetic effect in Rb0.91Mn1.05[Fe(CN)6]⋅0.6H2O ferromagnet. Magnetization of this system was reduced by irradiation with only one-shot of laser pulse (532 nm) at 3 K. This photodemagnetization was observed only when the laser power density (P) was above 9.3 mJ cm−2 pulse−1. The quantum yield was…
Polyaniline/single wall carbon nanotube composites were prepared to be used as printable conductors for organic electronics devices. We show here that the high aspect ratio of single wall carbon nanotubes enables percolation into a conducting network at extremely low nanotube concentration. The nature of the transport…
We show that under certain conditions, highly Co-enriched TiO2 anatase clusters nucleate on epitaxial TiO2 anatase grown on LaAlO3(001) by oxygen plasma assisted molecular beam epitaxy. In the most extreme cases, virtually all incident Co segregates to the clusters, yielding a nanoscale ferromagnetic phase that is not…