Materials Literature
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Abstract The microwave absorption and reflection characteristics of composites of polypyrrole with paper, cotton cloth and polyester fabrics have been evaluated. Refiectivity measurements in the range 2–18 GHz and plane wave modelling have revealed impedance charateristics with a common transition rgion. Relationships…
The outgassing rate from an electropolished stainless steel (type 304) surface is measured after the surface is exposed to H2O vapor at pressures (p0) of 10−3–10 Torr for exposure periods (t0) of 3–600 min. The system is kept at 310, 350, or 390 K during H2O exposures and subsequent outgassing measurements. Our data s…
The results of a study of the effects of constant uniaxial stress on the irreversible and reversible differential permeabilities of minor and saturation major hystersis loops are presented, extending an earlier study which studied those permeability components on the initial magnetization curve. Tension was found to i…
Abstract The effect of transesterification on the compatibility of polycarbonate poly(ethylene terephthalate) (PC/PET) blends and the crystallization and melting behaviour of PET was studied. The results show that with increase of the reaction extent, the compatibility of the blends was enhanced during melt‐processing…
Abstract A new operationally defined method for the measurement of fixed inorganic nitrogen (N fix ) associated with clays has been tested and applied to a sequence of mixed-layer illite/smectite (I/S) (ranging from 40 to 68% illite in I/S) in shales from a drill site in Terrebonne Parish, Louisiana. This new method h…
Ferroelectric phase transition in (Ba,Ca)TiO 3 ceramics has been investigated using dielectric measurements. It is shown that samples prepared using (Ba,Ca)CO 3 , precursors exhibit diffuse phase transition (DPT) while those prepared by the conventional route show BaTiO 3 ‐type sharp transition. The diffuseness of the…
This paper gives an overview of the science of crystals of biological macromolecules. The historical background of the field is outlined and the main achievements and open problems are discussed from both biological and physical-chemical viewpoints. Selected results, including data from the authors, illustrate this ov…
Point-defect calculations in h.c.p. zirconium have been carried out with a pair potential constructed in terms of the generalized pseudopotential theory. Two models of the h.c.p. lattice with either the ideal or the experimental c/a ratio were considered. It has been found with both models that the monovacancy has the…
The role of surface roughness on the coefficient of friction and wear of polished CVD diamond films has been investigated. Diamond films grown on single crystal silicon (001) substrates by Hot Filament Chemical Vapor Deposition (HFCVD) process were polished by a chemomechanical process in which a diamond film was poli…
Abstract The Cushman‐Barber model was evaluated for K uptake by cotton ( Gossypium hirsutum L.) from vermiculitic soils of high K‐fixation capacity and low solution‐phase K + concentration. On these soils, cotton exhibits late‐season K deficiency while other crop species remain unaffected. Four soil treatments of NH 4…
An embedded-defect (ED) interatomic potential for Fe is presented. The ED model is based on the same physical description of interactions as the embedded atom method (EAM) but including angular-dependent many-body local terms. In this work, the ED potential is fitted to several Fe properties and is used to simulate th…
We compared sequential and separate extraction procedures for estimating non‐crystalline and crystalline aluminum (Al) and iron (Fe) in a floodplain forest soil. We used 0.2M acid ammonium oxalate (pH 3.0) to estimate non‐crystalline Al and Fe, dithionite‐citrate‐bicarbonate to estimate crystalline Fe, and 0.1M sodium…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnomalous Segment Diffusion in Polymer MeltsMatthias Appel, Gerald Fleischer, Joerg Kaerger, Franz Fujara, and Inyong ChangCite this: Macromolecules 1994, 27, 15, 4274–4277Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Published inissue 1…
Unlike polycrystalline diamond films, amorphous hydrogenated carbon (AHC) films can be deposited at room temperature, are amorphous in atomic structure, and form very smooth surfaces. Amorphous hydrogenated carbon film consists of very small 10–20 Å sp2 bonded (graphitic) clusters captured in a largely sp3 coordinated…
We have used perturbed-angular-correlation (PAC) spectroscopy to measure nuclear-electric-quadrupole interactions at the Ti site in ceramic samples of rutile ${\mathrm{TiO}}_{2}$. To investigate differences in the probe crystal chemistry, we used two chemically different PAC probes, $^{111}\ensuremath{\rightarrow}^{11…
The development of important applications related to optical telecommunications and optical signal processing rely increasingly on nonlinear optical phenomena underlying these optical functions such as frequency conversion and modulation, amplification and emission, multiplexing and directional switching, optical logi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBehavior of Poly(D,L-lactic acid) Monolayers at the Air-Water Interface. Effect of Spreading SolventsCatherine Ringard-Lefebvre and Adam BaszkinCite this: Langmuir 1994, 10, 7, 2376–2381Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsotopic Labeling Studies of the Effects of Temperature, Water, and Vanadia Loading on the Selective Catalytic Reduction of NO with NH3 over Vanadia-Titania CatalystsBronwyn L. Duffy, H. Edward Curry-Hyde, Noel W. Cant, and Peter F. NelsonCite this: J. Phys. Chem. 1994, 98,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of Titanium and Zirconium Valerate Sol-Gel FilmsKathryn G. Severin, Jeffrey S. Ledford, Beatrice A. Torgerson, and Kris A. BerglundCite this: Chem. Mater. 1994, 6, 7, 890–898Publication Date (Print):July 1, 1994Publication History Published online1 May 2002P…
The wavelength dependence of the optical reorientation of nematic liquid crystals is investigated in the presence of two dyes, using the z-scan technique. A strong correlation is found between the magnitude of the dyeinduced amplification of the optical torque and the dichroism of the system.