Materials Literature
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Abstract Aminoalkyl celluloses (AmACs) were prepared from 6‐chlorodeoxycellulose and aliphatic diamines H 2 N(CH 2 ) m NH 2 (m = 2, 4, 6, 8). Their adsorption and desorption of divalent heavy metal ions such as Cu 2+ , Mn 2+ , Co 2+ , Ni 2+ and their mixtures were also investigated in detail. Adsorption of metal ions…
A thin liquid ribbon deposited on a wettable surface and subjected to a horizontal thermal gradient develops periodic fingers towards the cold region. We present an observation of the exponential growth regime, expected at early times, but not accessible in other driven fingering patterns induced by gravitational flow…
Velocity interferometry diagnostics are used to monitor transmitted compressive shock and release waves in yttria (Y2O3)-stabilized tetragonal and cubic zirconia. In tetragonal zirconia compressive yielding due to lattice slip or lattice instability is observed at 13–17 GPa and again at 30–31 GPa. This represents an a…
The influence of curvature on the radial vibrational modes in ${\mathrm{C}}_{60}$ and ${\mathrm{C}}_{60}$-based fibers is considered and is shown to lead to a softening of these modes in comparison with the out-of-plane phonon mode in graphite. The effect on the restoring force constants of doping these systems with a…
A technique is presented that uses molecular-dynamics simulation to generate the atomic positions needed to calculate the crystal-field parameters used in a Judd-Ofelt (JO) analysis. A slightly modified theory is used that permits analysis of both \ensuremath{\pi}- and \ensuremath{\sigma}-polarized absorption spectra.…
The magnetization and magnetic susceptibility of Bridgman-grown ${\mathrm{Sn}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Gd}}_{\mathit{x}}$Te samples with values of x up to 0.09 have been measured in fields up to 5.5 T over a temperature range from 2 to 300 K and in fields up to 23 T at 4.2 K. The low-field, high…
The structural gene (hdl IVa) for the Pseudomonas cepacia MBA4 2-haloacid halidohydrolase IVa (Hdl IVa) was isolated on a 1.6 kb fragment of Ps. cepacia MBA4 chromosomal DNA. The recombinant halidohydrolase was expressed in Escherichia coli and Pseudomonas putida and the structural gene was subcloned on to the tac exp…
The gold--polycrystalline-diamond interface has been characterized by x-ray-photoelectron-spectroscopy (XPS), Auger-electron-spectroscopy (AES), and current-voltage (I-V) measurements. The I-V characteristics of gold contacts on polycrystalline diamond were correlated with interface observations by XPS and AES. Minima…
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 ${10}^{11}$…