Materials Literature
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The bond fluctuation model of polymer chains on lattices is used to study layers of polymers anchored with one end at a hard wall, assuming good solvent conditions and repulsive interactions between the monomers and the wall. Chain lengths from N=10 to N=80 and grafting densities σ from 0.025 to 0.20 are considered, b…
Boron atoms from Nd:YAG laser ablation of the solid have been codeposited with Ar/O2 samples on a 11±1 K salt window. The product infrared spectrum was dominated by three strong 11B isotopic bands at 1299.3, 1282.8, and 1274.6 cm−1 with 10B counterparts at 1347.6, 1330.7, and 1322.2 cm−1. Oxygen isotopic substitution…
The band structure of graphite with the hypothetical simple hexagonal structure has been investigated near the Fermi energy, using a tight-binding approximation. Some general features of the structure of the \ensuremath{\pi} bands in the neighborhood of the zone edge are obtained and are expressed in terms of appropri…
A detailed study of guided optical modes in planar heterostructures involving one or two media with negative dielectric constant is presented. The existence and the form of the solutions with respect to geometrical and physical parameters are derived. The cases of a metal between two dielectrics and a metal-dielectric…
Using density-functional calculations, we examine the electronic structure of magnetite in the spinel crystal structure in order to gain insight into the nature of the Verwey transition. The calculated cohesive and magnetic properties are in agreement with experimental results. The magnetic structure is analyzed using…
The results obtained in this study establish that liposome formulations incorporating a synthetic polyethylene glycol-derivatized phospholipid have a pronounced effect on liposome tissue distribution and can produce a large increase in the pharmacological efficacy of encapsulated antitumor drugs. This effect is substa…
Study of the heat-transport properties of actinide-based mixed oxides is of importance in nuclear technology. This paper describes laser flash technique studies of the thermal diffusivity and thermal conductivity carried out on thorium-lanthanum mixed oxide solid solutions covering a temperature range from 573 to 1573…
The microhardness H v of xZnO.(50-x)PbO.50B 2 O 3 glasses has been studied as a function of ZnO content and gamma dose. H v shows a maximum at about 15 mol.% ZnO. 11 B NMR suggests the formation of non-bridging oxygen ions in the borate network as ZnO is added in the PbO.B 2 O 3 glass. Both the density and the molar v…
Abstract Molecular‐mechanics calculations of the sexidentate coordinated complexes of the pendant arm macrocyclic hexaamines trans ‐ (L 1 ) and cis ‐6,13‐dimethyl‐3,4,8,11‐tetraazacyclotetradecane‐6,13‐diamine (L 2 ) reveal that the trans ‐isomer shows a preference toward small metal ions, whereas the L 2 may coordina…
It is shown that nonlocal separable potentials may be used to study bound states of particles in multicentre potentials. The binding energy is obtained in a closed form. The cases of H2 + ion and polymer chains are discussed in detail and results compared to experimental data.
Electron nuclear double resonance (ENDOR) experiments were performed on 14N (natural abundance) and 15N-enriched iron-sulfur Rieske protein in the ubiquinol-cytochrome c2 oxidoreductase from Rhodobactor capsulatus. The experiments proved that two distinct nitrogenous ligands, histidines, are undoubtedly ligated to the…
An infrared radiation pyrometer for transient temperature measurement and a photoelectric installation for micrometric length-change measurement were developed. After being heated by a CO2 laser pulse of 0.1 μs, the transient temperature-rise history and length change of thermal expansion of 20–50 μm Al films during t…
Diamond thin films have been doped with nitrogen during growth by the hot-filament technique. For nitrogen concentrations in the films, determined by quantitative secondary ion-mass spectroscopy (SIMS) exceeding about 3×1018 atoms/cc, a decrease of several orders of magnitude is observed in the electrical conductivity…
Hydrogen-vacancy interaction in tungsten was investigated by means of the perturbed angular correlation technique, using the isotope 111 In as a probe. Hydrogen trapping at an 111 In-vacancy cluster manifests itself as a change of the local electric field gradient, which gives rise to an observable shift of the quadru…
Dynamical growth aspects of symmetry-breaking, first-order phase transitions for which the primary order parameter is a second-rank tensor, e.g., strain describing diffusionless structural phase transitions, are considered. It is found that a single domain does not always grow inside the parent phase matrix, but inste…
A new phase-modulation technique for nonlinear laser spectroscopy is applied with a relative resolving power in the sub-Hz range to measure fundamental relaxation processes of the N-V center in diamond. Complementary EPR experiments versus temperature establish the spin character of the ground state in the absence of…
Ge microcrystals embedded in SiO2 glassy matrices were formed by a radio-frequency magnetron cosputtering technique and then annealed at 800 °C for 30 min. The average radius of the Ge microcrystals in SiO2 was determined to be about 3 nm by means of Raman spectroscopy and high resolution electron microscope. The anne…
Abstract The wettability of poly(ethylene terephthalate) (PET) films in water was significantly improved upon exposure to argon glow discharge. Depending upon the lengths of glow‐discharge exposure, the water contact angle (CA) of the untreated film (73.1° ± 0.1°) was reduced to between 33.7° and 41.0° on the argon gl…
Abstract Easy‐care finishing of cotton fabrics invariably results in the loss of mechanical properties of the fabrics. There have been many attempts from time to time by different workers to reduce the above loss in the mechanical properties. But the problem is yet to be resolved satisfactory. As the uniform distribut…
Abstract Polyactide (PLA) and poly(lactide‐ co ‐glycolide) (PLGA) were prepared by bulk ring‐opening polymerization of lactide or lactide/glycolide using stannous octoate as initiator. PLA and PLGA microspheres with an average diameter of 65–100 μm were prepared by a solvent evaporation process. An in vitro degradatio…