Materials Literature
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A magnetic loading technique was used to ramp load pure aluminum and 6061 aluminum alloy to peak stresses of approximately 29GPa. The peak loading rate was approximately 106∕s, followed by unloading from peak stress at a rate of about 105∕s. The pure aluminum samples had impurity levels ranging from about 10ppmto0.5wt…
Cerium-doped lutetium pyrosilicate Lu2Si2O7:Ce3+ (LPS:Ce) single crystal samples grown via Czochralski method were annealed under air and H2 atmospheres from 350to1600°C. The x-ray excited luminescence spectra and UV as well as thermal stimulated luminescence spectra were measured. It was found that the luminescence e…
Abstract Amyloidfasern gehören zu den wichtigsten selbstorganisierten Strukturen in der Natur. Zahlreiche Proteine und Peptide mit unterschiedlichen Aminosäuresequenzen bilden unter verschiedenen Bedingungen solche sehr stabilen und hochgradig organisierten Assoziate, die man in Phasenzuständen von Flüssigkristallen b…
We report on a negative-zero-positive metamaterial based on an omega-type microstructure with special attention on the nonvanishing group velocity for a zero refractive index. We first investigate the dispersion characteristics by full wave analysis, by stressing the necessary conditions of equality between the electr…
The field effect transistor based on carbon nanotubes (CNT) is a very promising candidate for post-CMOS microelectronics. Transport in the CNT channel is dominated by the Schottky barriers existing at the metal source contacts. The nature of the metal and the geometry of the contact appear to influence strongly the el…
The interfacial relationship and the microstructure of nonpolar (11−20) ZnO films epitaxially grown on (1−102) R-plane sapphire by molecular beam epitaxy are investigated by transmission electron microscopy. The already-reported epitaxial relationships [1−100]ZnO∥[11−20]sapphire and ⟨0001⟩ZnO∥[−1101]sapphire are confi…
Semiconductor tetrapods are expected to exhibit isotropic optical properties due to their tetrahedral symmetry. We have investigated the optical polarization properties of individual $\mathrm{Cd}\mathrm{Se}∕\mathrm{Cd}\mathrm{S}$ tetrapods of high structural quality. In contrast to the light absorption behavior, a pro…
Many factors influence the shapes of living and manufactured membranes. In addition to boundary conditions, surface tension, and curvature, the ordering of particles embedded in or attached to a membrane can strongly influence its equilibrium shape. As a simple model of such ordering, we consider rodlike particles tha…
The characteristics of chemical vapor sensors constructed from porous Si rugate filters are examined. The peak position of the resonant wavelength exhibits a redshift response upon exposure to ethanol vapors. The filter response scales with the vapor partial pressure; the concentration level is estimated based on theo…
This Communication reports simultaneous tracking of structural and kinetic information for the photoinduced elimination reaction of 1,2-diiodotetrafluoroethane in solution by transient X-ray diffraction. The transient structure of .CF2CF2I is determined to be a classical mixture whereas .CH2CH2I is bridged. Compared w…
First-principles spin-polarized calculations have been conducted to investigate the structural, electronic and magnetic properties of 3d transition metal Mn doping into two typical sites in the upper layer of bilayer graphene with the AB Bernal structure. One of the doping sites is above the center of a carbon hexagon…
Hysteresis loops in D = 1.8 nm CdSe-TOPO nanoparticles show ferromagnetism at 5 K and 300 K. Charge transfer from Cd to the Cd–O bond is shown by arrow in the Fourier transforms amplitudes of the EXAFS k2χ data at the Cd K-edge in the smaller 2.8 and 4.1 nm particles. This charge transfer produces holes in the Cd 4d b…
Four heterometallic, enneanuclear Mn8Ce clusters [Mn8CeO8(O2CMe)12(H2O)4] (4), [Mn8CeO8(O2CMe)12(py)4] (5), [Mn8CeO8(O2CPh)12(MeCN)4] [Mn8CeO8(O2CPh)12(dioxane)4] (6), and [Mn8CeO8(O2CCHPh2)12(H2O)4] (7) have been prepared by various methods. Their cores are essentially isostructural and comprise a nonplanar, saddleli…
In this study, bioscaffolds using poly(DL-lactide-co-glycolide) acid (PLGA) were fabricated and studied. The gas foaming/salt leaching technique in a batch foaming setup was employed, and the effects of material composition of PLGA on the morphology and mechanical properties using this process were investigated. Two m…
Wetting of porous templates, e.g., porous aluminum oxide with pore diameters in the range from 25 up to several 100 nm, by polymer melts has been demonstrated previously to be a highly effective way toward the preparation of polymer nanotubes. The concept evaluated in this contribution is to perform wetting from polym…
Abstract The morphology and dynamic viscoelastic properties of isotactic polypropylene (PP) blended with oil‐free/oil‐extended ethylene–propylene–diene (EPDM) rubbers were studied. Unvulcanized and dynamically vulcanized blends with the compositions PP/EPDM = 50/50 and = 30/70 were investigated. The morphology was obs…
The paper investigates the influence of boric oxide (B2O3), which has a phonon energy of 1500cm−1, on enhancement in the population of the I13∕24 level via the increased multiphonon relaxation in the Er-ion doped tellurite fibers. The paper discusses the structural compatibility of TeO4 structures with BO4 structural…
The authors report on the experimental investigation of the thermal conductivity of nitrogenated ultrananocrystalline diamond (UNCD) films on silicon. For better accuracy, the thermal conductivity was measured by using two different approaches: the 3ω method and transient “hot disk” technique. The temperature dependen…
The surface ab planes of the M1 phase exposed selectively after atomic layer deposition (ALD) of alumina followed by crushing showed significantly improved selectivity to acrylonitrile during propane ammoxidation. The results demonstrated the importance of surface ab planes for the activity and selectivity of the M1 p…
Elastin synthesis and physiologic compliance are significant challenges in blood vessel tissue engineering. Here, we report that a biocompatible elastomeric scaffold can support the co-expression of elastin and collagen, which likely yielded the physiologic compliance in the constructs. A biodegradable elastomer, poly…