Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantitative Comparison of Self-Consistent Field Theories for Polymers near Interfaces with Monte Carlo SimulationsFriederike Schmid and Marcus MuellerCite this: Macromolecules 1995, 28, 25, 8639–8645Publication Date (Print):December 1, 1995Publication History Published onli…
Abstract The synthesis and structural characterisation of three copper–lanthanoid complexes are reported. The compounds, of general formula [Cu 3 M(chp) 8 (NO 3 )(S)] [M = Gd, S = H 2 O in 2 ; M = Dy, S = H 2 O in 3 ; M = Er, S = (H 2 O) 0.5 (MeOH) 0.5 in 4 ; chp = anion of 6‐chloro‐2‐pyridone], are made by reaction o…
The concept of mesophase stabilization by partial fluorination of side chains has been extended to discotic systems. The mesophase structure is essentially unchanged, whereas the temperature range of the mesophase is strongly affected by the fluorinated side chains. Triphenylene substituted with only one partially flu…
We have identified an operon in Bacillus subtilis, designated qcr, that is thought to encode a quinone: cytochrome c reductase. Northern (RNA blot) analysis suggests a tricistronic operon. The operon is located at about 200 degrees on the B. subtilis map. Disruption of the operon leads to loss of a 22-kDa cytochrome c…
The classical theory of nucleation and growth of crystals is examined for concentrated suspensions of hard-sphere colloidal particles. The work of Russel is modified, extended, and evaluated, explicitly. Specifically, the Wilson-Frenkel growth law is modified to include the Gibbs-Thomson effect and is evaluated numeri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSimultaneous Improvement of Permeance and Permselectivity of 3,3',4,4'-Biphenyltetracarboxylic Dianhydride-4,4'-Oxydianiline Polyimide Membrane by CarbonizationJun-ichiro Hayashi, Masatake Yamamoto, Katsuki Kusakabe, and Shigeharu MorookaCite this: Ind. Eng. Chem. Res. 1995,…
Solutions of K4[Mo(CN)8] and Me3SnCl interdiffuse to form crystals of 1, a three-dimensional coordination polymer containing large channels from which some of the solvent molecules can be removed without the collapse of the structure (section of structure depicted on the right). The corresponding iso-structural tungst…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTZero-Pressure Thermal-Radiation-Induced Dissociation of Gas-Phase Cluster Ions: Comparison of Theory and Experiment for (H2O)2Cl- and (H2O)3Cl-Robert C. Dunbar, Terrance B. McMahon, Detleff Thoelmann, D. Scott Tonner, Dennis R. Salahub, and Dongqing WeiCite this: J. Am. Chem…
SUMMARY Imaging filters developed over the last few years permit rapid elemental mapping by energy‐filtering transmission electron microscopy (EFTEM), with resolution and sensitivity limited primarily by the sample and by the TEM. We explore the attainable spatial resolution in the elemental maps theoretically and exp…
The plastic deformation behaviour of polysynthetically twinned (PST) Ti-Al with three different orientations has been studied in tension and compression as a function of temperature in a range from −196 to 1100°C. With increase in temperature, the yield stress decreases rather rapidly at low temperatures and then decr…
The formal exchange of the pyrrole units of porphyrin by bipyrrole units provides the title compound 1. The hexadecaethyl derivative of 1 is the only isolable product of a MacDonald condensation of tetrapyrrolic as well as of dipyrrolic components. The new cyclooctapyrrole adopts a figure-eight conformation in the sol…
Raman and XPS measurements have been performed on KI crystals irradiated near 200 K. The Raman studies show I3 − and In − (n = 5, 7,—) clusters which anneal together with F- and V- centres at 338 K. A small development of (I2)n aggregates occurs during the anneal; these decay near 378 K and are responsible for a broad…
Abstract Semiempirical Molecular Orbital Calculations (MNDO AM1) support kinetic results concerning the molecular mechanism of thermal degradation of PVC and show that under special conditions radical and ionic mechanisms are also possible. The degradation of poly(vinyl chloride) is a complex chain dehydrochlorination…
Abstract Multilayer LDPE/nylon‐6 films with an overall content of 71 wt% LDPE, 24 wt% nylon‐6, and 5 wt% PE‐based tie‐layer adhesive were reprocessed under both minimal and extensive mixing conditions. Thermal and mechanical properties, oxygen and water vapor permeability, and morphology of the reprocessed samples wer…
Abstract A constrained non‐linear deconvolution method was used to analyse the Raman spectrum of amorphous carbon. The method was tested by applying it to a model spectrum. Before the deconvolution the observed Raman spectrum was smoothed by a least‐squares convoluting procedure. The proper width of the spread functio…
Abstract The kinetics of the thermal degradation of solid powdered poly(vinyl chloride) (PVC) under nitrogen was studied by thermogravimetry, rate of hydrogen chloride evolution, and rate of polyene sequence formation. These results are accommodated by a chain mechanism involving initiation by random dehydrochlorinati…
The effect of gravity on the contact angle was calculated using a precise drop shape model. The drop shape, whose surface curvatures change under the influence of gravity, was calculated following Laplace's equation. The total free energy of the three interfacial free energies and the potential energy of the drop were…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMoving-Bed Reactor Model for the Direct Reduction of Hematite. Parametric StudyEnrique D. Negri, Orlando M. Alfano, and Mario G. ChiovettaCite this: Ind. Eng. Chem. Res. 1995, 34, 12, 4266–4276Publication Date (Print):December 1, 1995Publication History Published online1 May…
Abstract Polypropylene (PP) composites containing 0.30 vol% of talc filler, in addtion to blends modified with an ethylene‐propylene copolymer (EPR) elastomer were prepared and their fracture resistance was determined by the standard Ixod impact test and by a fracture mechanics technique. Effects of composition, type…
Leather tanning industry as a significant polluting source is exposed to stringent effluent limitations. On the other hand, leather processing has a very complex structure in terms of both production and waste streams. A systematic subcategorization approach is required to assess the pollution characteristics and cont…