Materials Literature
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The scaling of the critical temperature (Tc) with the degree of polymerization (N) in symmetric polymer blends is investigated via a new molecular closure to the polymer reference interaction site model integral equation theory. The theory predicts Tc∼N, which is qualitatively consistent with classical mean field idea…
The magnetism of ${\mathrm{Fe}}_{\mathrm{N}}$ clusters is studied by using a d-band Hubbard-like Hamiltonian in the unrestricted Hartree-Fock approximation. The local magnetic moments, magnetic order, and average magnetization per atom are calculated for T\ensuremath{\rightarrow}0 as a function of the intra-atomic Cou…
The occurrence of stress in thin films has led to serious considerations of stability problems in the semiconductor industry. It may cause mechanical failure of films, such as adhesion reduction or contact peel-off, or variations in electrical properties. The existence of stress will also alter electromigration behavi…
Important parameters of the bulk and surface electronic structure are obtained for Cu(100), Ag(100), Au(100), and ${\mathrm{Cu}}_{3}$Au(100) surfaces using inverse photoemission with a high-resolution, tunable detector. The transitions from the Fermi level to the upper ${\mathrm{\ensuremath{\Delta}}}_{1}$ s,p band are…
A model was developed to account for the recent observations indicating that type I collagen fibrils assembled in vivo grow from symmetrical pointed tips. The essential features of the model are (i) a distinctive structural nucleus forms at each end of a growing fibril and growth of the fibril then proceeds by propaga…
The metalorganic chemical vapor deposition technique has been successfully applied to the growth of epitaxial platinum thin films on (100) surfaces of single-crystal potassium tantalate (KTaO3) and strontium titanate (SrTiO3). Platinum thin films grown on KTaO3 (100) at a rate of 70 nm/h showed strong Rutherford backs…
The dielectric permittivity and loss tangent of hyperquenched glassy water (HGW) have been measured for fixed frequencies of 1 and 10 kHz from 80 K to its crystallization temperature and corresponding measurements have been made of the crystallized forms. The effect of thermal cycling has been investigated. Except for…
Dissolution (mixing or melting) of inhomogeneities formed during spinodal decomposition in binary polymer mixtures is studied both experimentally and theoretically. The details of the dissolution experiment with time-resolved light scattering on polystyrene/poly(vinylmethylether) are presented. The theoretical approac…
Polycrystalline silicon (poly-Si) thin films prepared by recrystallization of α-Si either with annealing or ion implantation and annealing have been studied with the optical techniques of spectroscopic ellipsometry (SE) and Raman spectroscopy (RS), as well as with transmission electron microscopy (TEM). A detailed ana…
The Raman spectra of polycrystalline silicon doped with implanted boron were measured before and after thermal annealing. In addition to the peak of the silicon phonon mode at 521 cm−1, a shoulder at about 500 cm−1 was observed. For samples without annealing, this shoulder increased with the increase of the dopant dos…
It is indicated that the stability of average valence +4/3 of Cu, i.e. Cu +4/3 , in various (DCNQI) 2 Cu salts is the consequence of strong correlation at Cu sites. It is also discussed that the phase diagram separating metallic and insulating states together with the reentrance on the plane of pressure and temperatur…
Prolonged exposure to band-gap light decreases the photoconductivity of annealed films of amorphous chalcogenides (${\mathrm{As}}_{2}$${\mathrm{S}}_{3}$, ${\mathrm{As}}_{3}$${\mathrm{S}}_{7}$, AsS, ${\mathrm{As}}_{2}$${\mathrm{Se}}_{3}$, ${\mathrm{GeS}}_{2}$, ${\mathrm{GeSe}}_{2}$, and GeSe). This can be attributed to…
The thermal expansion, specific heat, dielectric constant, and resistivity of the novel organic nonlinear crystal, L-arginine phosphate monohydrate have been measured as a function of temperature. The thermal expansion is highly anisotropic and has been interpreted on the basis of crystal structure. The dielectric con…
SF6 samples (PSF6=100 or 200 kPa) were submitted to point-to-plane dc negative polarity corona discharges in the presence of water [concentration=2000 ppmv (parts per million by volume)] or without the addition of water. The stable gaseous byproducts formed, (SO2F2, SOF2, and S2F10) were assayed by gas-phase chromatog…
Abstract An investigation was carried out into the effect of the extent of reaction on the mechanical properties, in a mixture of an epoxy prepolymer and a cycloaliphatic diamine, above the gel point. First, the most adequate technique to approach the extent of reaction was chosen between differential scanning calorim…
The in-crystal molecular dipole moment of the nonlinear optical material 2-methyl-4-nitroaniline has been determined from a charge density analysis of x-ray diffraction data. The results indicate a considerable enhancement of the free molecule dipole moment, due to the crystal field. The analysis suggests that aspheri…
Collagen fibrils generated in vitro at 37 degrees C by enzymic removal of C-terminal propeptides from type I pC-collagen (an intermediate in the normal processing of type I procollagen to collagen containing the C-terminal propeptides but not the N-terminal propeptides) display shape polarity, with one tip fine tapere…
Hall effect and infrared absorption measurements of n-type silicon carbide of the 6H polytype are employed to investigate the energy position of the ground state and excited states of the nitrogen donor. A donor model is proposed that assigns four series of absorption lines to electronic transitions of three donor spe…
Hot-filament chemical vapor deposition is a common method employed for diamond deposition. Due to the filament-substrate proximity, large temperature variations across the substrate is often possible. Variations in substrate temperature need to be minimized in order to deposit polycrystalline diamond films of uniform…
Stoichiometric films of cupric and cuprous oxide are deposited on Si, MgO, and Y-ZrO2 substrates by pulsed excimer laser ablation technique. It is found that the equilibrium phase diagram based considerations dictate the phase formation. The films are characterized by small-angle x-ray diffraction, infrared, and UV-vi…