Materials Literature
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Metal-insulator-semiconductor (MIS) diodes with an electron-beam-deposited and oxygen-annealed thin (≊80 nm) Y2O3 dielectric layer on p-Si(100) show metal-oxide-semiconductor capacitor action. As-deposited Y2O3 films are oxygen-deficient amorphous and show low 5×10−9 A leakage currents for a capacitor area of 0.785 mm…
We study the phase diagram and scattering functions of a ternary mixture of A and B homopolymers, in equal concentrations, and AB diblock copolymer. We locate the disorder line, which marks the appearance of damped oscillatory decaying correlation functions in the system, and also the Lifshitz and equimaxima lines of…
Epitaxial thin films of barium hexaferrite (BaFe12O19) have been fabricated by the pulsed laser deposition technique on basal plane sapphire. Structural studies reveal the films to be predominantly single phase and crystalline, with the c axis oriented perpendicular to the film plane. The magnetic parameters deduced f…
The microscopic properties of the inner surface of the cavities of Anopore and Nuclepore membranes are investigated with scanning electron microscopy (SEM), nitrogen adsorption isotherms, and deuterium nuclear magnetic resonance (2H-NMR). Useful information about the cavity orientation and morphology, and internal sur…
The electronic states of a monolayer of graphite on a Ni(111) substrate are investigated with use of first-principles self-consistent calculations. A notable feature of this system is that a formerly empty ${\mathrm{\ensuremath{\pi}}}^{\mathrm{*}}$ orbital of the graphite overlayer is now occupied because of its inter…
Polycrystalline samples of X-type Ba2Me2Fe28O46 (Me2-X, Me=Fe, Co, and Mn) hexagonal ferrite have been prepared by the classic ceramic method. Low-temperature magnetic properties, Curie temperatures, and distribution of divalent cations were studied. The substitution of Fe2+ ions with Co2+ and Mn2+ ions causes a decre…
The operator of a homogeneous electric field acting on a periodic quasi-one-dimensional system can be decomposed into a sum of two terms. One term affects interband mixing of states with the same quasimomentum k and therefore describes the polarization of the electronic distribution due to the electric field. The seco…
Shock-wave profiles of highly ordered pyrolytic graphite shocked normal to the basal plane of the graphite crystal structure have been measured. For graphite with sufficient orientational order a martensitic transformation to a diamond-like phase is observed with a transition onset pressure 19.6±0.7 GPa, the stability…
The electronic structure and optical properties of a red phosphor, ${\mathrm{Y}}_{2}$${\mathrm{O}}_{3}$:Eu, have been studied using the first-principles molecular-orbital and band-structure methods. Using the calculated one-electron energy levels, several properties of the host material and properties of the phosphor…
The I-V characteristics of titanium contacts on polycrystalline diamond have been correlated with x-ray-photoelectron-spectroscopy (XPS) and Auger-electron-spectroscopy (AES) characterizations of the interface. As-deposited titanium contacts were rectifying in nature because of minimal interaction between as-deposited…
We present a computational method for the ab initio study of magneto-optical quantities like the optical conductivity and the magneto-optical Kerr rotation based on density-functional theory. This method is tested here on the ferromagnetic metals Fe and Ni. The results for Fe agree very well with experimental data. Th…
An in-depth study has been performed of the nucleation of diamond on silicon by bias-enhanced microwave plasma chemical vapor deposition. Substrates were pretreated by negative biasing in a 2% methane-hydrogen plasma. The bias pretreatment enhanced the nucleation density on unscratched silicon wafers up to ${10}^{11}$…
Total cross sections have been measured for electron scattering on Kr, O 2 and CO in the 5-300 eV energy range utilizing a linear attenuation technique. The present results are found to be in good agreement with other experimental data for Kr and CO but deviate significantly from some of the previous measurements in t…
Protein sequences are often derived by translating genetic information, rather than by classical protein sequencing. At the DNA level cysteines and half cystines are indistinguishable. Here we show that the sequential environments of 'free' cysteine and half cystine are different. A possible origin of this difference…
We have carried out x-ray photoelectron spectroscopy on diamond thin films deposited by microwave assisted chemical vapor deposition technique using a H2-CH4 plasma. Films grown for different lengths of time, from 1 min to several hours, were analyzed for the surface composition in the C 1s and Si 2p regions. The resu…
Single‐crystal Brillouin scattering measurements of elastic moduli were performed on an eclogitic omphacite (space group C2/c) with chemical composition close to the diopside (CaMgSiO 2 O 6 , 29.9 mol %)‐jadeite (NaAlSi 2 O 6 , 57.8 mol %) join. Prom the 13 elastic moduli measured under ambient conditions we calculate…
The molecular relaxation of the liquid crystalline state of the water-cellulosic polyelectrolyte system was investigated using nuclear magnetic resonance spectroscopy (NMR) and differential scanning calorimetry (DSC). DSC and polarizing light microscopic observation showed that the system forms the liquid crystalline…
The reinforcement of polypropylene (PP) using wood cellulose has been studied. The strength and stiffness of the composites are improved by a prehydrolytic treatment of the cellulose as well as by the use of maleic anhydridemodified PP (MAPP) as a coupling agent for promoting interfacial adhesion. The embrittlement of…
Abstract A new and simplified proof of the sign of the second variation of the Oseen–Frank energy in terms of the elastic constants is given. The proof relies on the frame indifference of the energy and a new expression for the second invariant null lagrangian as a surface integral.
The antitumor activity of epirubicin (EPI) entrapped in long circulating "Stealth" liposomes containing a polyethylene glycol-derivatized phospholipid (S-EPI) was compared to epirubicin encapsulated in a conventional liposome formulation (L-EPI) and free epirubicin (F-EPI) against mouse colon 26 tumor in vivo. Pharmac…