Materials Literature
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The effects of W on the precipitation behaviour of 25 Cr-6Ni base super duplex stainless steels with various Mo and W contents have been examined following heat treatments in the temperature range 700–1050°C. Upon aging, the major intermetallic phase of the duplex stainless steel containing Mo was σ phase. In duplex s…
Space-charge distributions in plate and coaxial cable samples of various polyethylene (PE) materials such as high density polyethylene, linear low density polyethylene, low density polyethylene, and cross-linking polyethylene under dc voltage are systematically investigated by the pulsed electro-acoustic method. The c…
A variety of photostructural changes observed in tetrahedral and chalcogenide amorphous semiconductors are reviewed from physical and chemical points of view. In particular, observations of the photodarkening and related phenomena in chalcogenide glasses are summarized, and structural models which have been proposed s…
Corrosion of steel equipment from oil-containing water has been a significant problem in the petroleum industry for many years. Despite this known problem, essentially no methodical study has been performed to elucidate the mechanisms. Moreover, no attempts have been made to predict corrosion in predominately oil-base…
Abstract The study of structure and properties of semi‐crystalline polymer inter‐phases is important to explain and extend polymer applications. In this region, polymer chains exist in three distinct populations: tie chains that bridge the two crystals, chain folds and chain ends. The distribution of these populations…
Chemical imidization of polyamic acid based on 1,5-diaminonaphthalene and a dianhydride was studied by UV−visible and FT-IR ATR techniques under various reaction conditions, such as polyamic acid concentration, solvent condition (dry vs humidity-exposed NMP), catalysts of tertiary amines with different degrees of ster…
Raman spectroscopy was used to study strain-induced molecular stress in cold-drawn polyethylenes, which were being used as a model system for fibrils present in the crazes formed during environmental stress crack resistance (ESCR) tests. The molecular stress was measured at 240 K in order to minimize relaxation phenom…
The possibility that the structure of the novel semiconducting perovskite-related material strontium niobium oxide, Sr 5 Nb 5 O 17 , refined by Schmalle et al. [ Acta Cryst. (1995), C 51 , 1243–1246] in space group Pnn 2, might instead belong to space group Pnnm has been investigated following an analysis of the atomi…
The Unified Interaction Model (UNIM), developed to describe thermoluminescence dose response, is based on both radiation absorption stage and recombination stage mechanisms. The UNIM incorporates both the Track Interaction Model (TIM) for heavy charged particles (localised and highly nonuniform ionisation density dist…
This paper reports the near-infrared (NIR) surface-enhanced Raman scattering (SERS) detection of immune reaction on gold colloid particles without bound/free (B/F) antigen separation. A SERS spectrum was measured for anti-mouse IgG at 2.2×10-8 M adsorbed on gold colloid particles. The spectrum showed a number of Raman…
The various irreversible and reversible photoinduced phenomena in chalcogenide glasses, among them isotropic and anisotropic effects, were considered until now to have different origins. Upon reexamination, we find that the elemental photostructural steps are the same for all these phenomena. These are nonradiative re…
Abstract Novel guest-host liquid crystal systems containing 3,3-disubstituted azobenzenes as guests were prepared on the basis of molecular design by molecular calculations to achieve the improvement of compatibility of the chromophore with nematic phases. No phase change of nematic liquid crystals was induced by the…
71 Ga and 69 Ga single-crystal NMR spectra of a β-Ga 2 O 3 twin have been analyzed in terms of the 71 Ga/ 69 Ga quadrupole coupling and chemical shielding anisotropy (CSA) interactions. Analyses of the magnitudes and orientations of the interaction tensors for the two distinct crystallographic gallium sites in the two…
Type VIII collagen is a short chain collagen. Two chains have been described, alpha1(VIII) and alpha2(VIII), but the chain composition of type VIII collagen is far from resolved. To address this question, we have expressed full-length alpha1(VIII) and alpha2(VIII) chains in an in vitro translation system supplemented…
We have performed electron energy-loss spectroscopy analysis of polystyrene in the analytical transmission electron microscope in order to evaluate the possibility of obtaining both chemical and dielectric information on the polymer at the submicrometre scale. Irradiation has also been studied, particularly the influe…
The electrical conductivity of silicone rubber vulcanizates containing carbon blacks [e.g., acetylene black, lamp black, and ISAF (N-234) black] were investigated. The change in electrical conductivity with varying amounts of carbon blacks and the temperature dependence was measured. The mechanical properties like ten…
Electronic, vibrational and rotational contributions to the dipole moment μ, polarizability α, and first and second hyperpolarizabilities, β and γ, are presented for the boron hydride molecule; static and dynamic rovibrational properties are reported for the first time. The electronic contributions are computed ab ini…
Alternate feeding of glucose and propionic acid to phosphate-depleted batch cultures of Ralstonia eutropha (reclassified from Alcaligenes eutrophus ) produced poly(3-hydroxybutryate- co -3-hydroxyvalerate) [P(3HB- co -3HV)] with thermal properties markedly different from random copolymers of similar monomer content. T…
Discontinuous molecular dynamics simulations are used to study the structure and relaxation of large, off-lattice, near-perfect, tri- and tetrafunctional polymer networks at a packing fraction of 0.43. The networks are constructed by end-linking freely jointed, tangent hard-sphere chains ranging in length from N = 20…
A new route for the synthesis of conducting polypyrrole–silica composites is described. Silica gel particles were modified by aminopropyltriethoxysilane (APS) and acted as porous inorganic substrates for the in situ synthesis of polypyrrole (PPy). The resulting polypyrrole–silica–APS hybrid materials were characterize…