Materials Literature
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Melt chain dimensions of two polylactide samples were measured using small-angle neutron scattering. Three polylactides were synthesized: a deuterated polylactide containing 26% R-stereocenters (d-PLA-26), a hydrogenous polylactide with an R-content similar to the deuterated polylactide (PLA-28), and a hydrogenous pol…
Helping you keep pace with rapid developments in the field, Textile Sizing documents the rapidly changing scenario in textile processing and research in sizing. The authors analyze new fibers, spinning methods, and weaving techniques affecting textile production and studies the impact of fiber properties, yarn quality…
Three different types of porous low-k dielectric films, with similar dielectric constants, are characterized using x-ray porosimetry (XRP). XRP is used to extract critical structural information, such as the average density, wall density, porosity, and pore size distribution. The materials include a plasma-enhanced-ch…
Based on numerical simulations, a study of the high temperature, finite frequency, thermal conductivity kappa(omega) of spin-1/2 ladders is presented. The exact diagonalization and a novel Lanczos technique are employed. The conductivity spectra, analyzed as a function of rung coupling, point to a nondiverging dc limi…
On the basis of the mechanism of surface enhanced Raman scattering, it is shown that coherent anti-Stokes Raman scattering (CARS) of molecules attached to isolated gold nanoparticles are strongly enhanced and the signal from each particle is well localized. In addition to well-known advantages of CARS, the surface enh…
We report a Raman spectroscopic study on the strain-induced intensity variations of the radial breathing modes (RBM's) of single-wall carbon nanotubes (SWNT's) in epoxy/SWNT composites. Variations of between 30 and 150 % of the RBM intensities were observed over a range of strain between $\ensuremath{-}0.3$ and 0.7 %.…
We present first-principles total-energy calculations of domain wall energies for inversion domain boundaries and their interaction with point defects in ZnO. We find that the inversion domain boundaries (IDB's) with Zn-Zn and O-O wrong bonds are energetically unstable, and they transform into the so-called ${\mathrm{…
The structure and magnetic properties of (Fe56Pt44)100−xNx alloy films with x=0–15 at. % prepared by rf magnetron sputtering were investigated. Compared to an Fe56Pt44 binary film, (Fe56Pt44)100−xNx alloy films showed great enhancement in hard magnetic properties. A coercivity Hc of 1027 kA/m, a remanence Mr of 1.24 T…
On the basis of the Boltzmann equation, the authors propose a model that includes scattering from both film surfaces and grain boundaries, and have studied the quasiclassical electrical transport in metallic films. The in-plane electric conductivity of metallic films is obtained, and the theoretical results are shown…
The optomechanical characteristics of oriented polymer films made from a photopolymerizable liquid crystal diacrylate (BASF LC242) were examined, with general implications for oriented films of similar materials being used and considered for display-component applications. The birefringence of these uniaxial films bef…
A two-step quench process is modeled using Cahn−Hilliard theory for symmetric binary polymer mixtures. The blend is quenched from a stable state in the one-phase region to an unstable state in the two-phase region where it undergoes spinodal decomposition. The mixture is allowed to coarsen for two different time perio…
We have studied the effect of cyclization of a linear poly(styrene- b -isoprene) PS- b -PI copolymer system on the morphology of the organized nanostructures. The linear and the cyclic copolymers have exactly the same degree of polymerization, i.e., 290 for PS and 110 for PI, corresponding to a volume fraction Φ PS =…
We report electronic structure calculations for the multiferroic ferromagnetoelectric perovskite ${\mathrm{PbFe}}_{1/2}{\mathrm{Ta}}_{1/2}{\mathrm{O}}_{3},$ within density functional theory in the local spin density approximation (LSDA) and within the LSD+U approach. Our results, corresponding to several possible crys…
Single walled carbon nanotubes (SWNT) produced by the anodic arc discharge over a range of constant background pressures of helium (100–1000 Torr) were examined under a high-resolution transmission electron microscope, and a Raman spectrometer. It was found that the average SWNT diameter is about 2 nm and fairly indep…
Powder Mn 2+ EPR spectra of 5-nm ZnS:Mn quantum dots have been analyzed in detail to account for all the observed fine spectral features. The same spectral features are observed in samples with low doping of Mn 2+ (0.003−0.008%), showing 10 weak forbidden transitions between the six-line pattern of the M S = − 1 / 2 t…
A novel mesoporous MCM-41-type of hybrid material was synthesized by co-condensation of tetraethyl orthosilicate and the chelate ligand (3-trimethoxysilylpropyl)[3-(2-pyridyl)-1-pyrazolyl]acetamide ( 1 ) in the presence of cetyltrimethylammonium bromide as template. Surfactant extraction produced hybrid mesoporous mat…
Epitaxial Ni2MnGa and Ni2Mn1.2Ga0.8 thin films have been grown by molecular beam epitaxy on GaAs (001) substrates with Sc0.3Er0.7As interlayers. Structural characterization of as-grown films confirms the epitaxially stabilized single crystal structure of the films and indicates that the films grow pseudomorphically on…
Time-resolved photoluminescence spectra after nonresonant excitation show a distinct 1s resonance, independent of the existence of bound excitons. A microscopic analysis identifies exciton and electron-hole plasma contributions. For low temperatures and low densities, the excitonic emission is extremely sensitive to d…
La(Fe x Si 1−x ) 13 and their hydrides exhibit large magnetocaloric effects due to the itinerant-electron metamagnetic transitions in a wide temperature range covering room temperature. Thermal conductivity and diffusivity of La(Fe0.88Si0.12)13 and La(Fe0.88Si0.12)13H1.0 have been investigated, together with those of…
We have succeeded in growing epitaxial films of rocksalt ${\mathrm{VO}}_{x}$ on MgO(001) substrates. The oxygen content as a function of oxygen flux was determined using ${}^{18}{\mathrm{O}}_{2}$-Rutherford backscattering spectrometry and the vanadium valence using x-ray-absorption spectroscopy. The upper and lower st…