Materials Literature
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Several new classes of mesogenic heterocyclic liquid crystals with different terminal groups are presented. Their material properties are investigated and compared with those of 2,5-disubstituted pyridine derivatives. New compounds are found to exhibit broader temperature ranges and higher transition temperatures than…
Abstract In attempts to identify potential applications for refined commingled postconsumer plastics, a feedstock containing about 80% polyethylene (PE) and lesser amounts of poly(ethylene terephthalate) (PET), polystyrene (PS), polypropylene (PP), and poly(vinyl chloride) (PVC) was modified through functionalization…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPredictions of protein backbone structural parameters from first principles: Systematic comparisons of calculated N-C(.alpha.)-C' angles with high-resolution protein crystallographic resultsXiaoqin Jiang, Ming Cao, Brian Teppen, Susan Q. Newton, and Lothar SchaeferCite this:…
Abstract Accurate X‐ray diffraction measurements are carried out as function of temperature in antiferroelectric betaine phosphate (BP), ferroelectric betaine phosphite (BPI), and mixed compounds of BP 1− x BPI x . In agreement with previous studies, the phases which derive from a high‐temperature phase with P2 1 /c s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelf-Assembled Lipidporphyrin Bilayer Vesicles. Microstructure and Dioxygen Binding in Aqueous MediumEishun Tsuchida, Teruyuki Komatsu, Kenji Arai, Kazuhiro Yamada, Hiroyuki Nishide, and Juergen-Hinrich FuhrhopCite this: Langmuir 1995, 11, 6, 1877–1884Publication Date (Print…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron Energy Loss Distributions in Solid and Gaseous HydrocarbonsJay A. LaVerne and Simon M. PimblottCite this: J. Phys. Chem. 1995, 99, 26, 10540–10548Publication Date (Print):June 1, 1995Publication History Published online1 May 2002Published inissue 1 June 1995https://…
We study the electronic eigenstates on several two-dimensional quasiperiodic lattices, such as the Penrose lattice and random-tiling lattices, using a tight-binding Hamiltonian in the vertex model. The infinitely degenerate states at E=0 are especially investigated. We present a systematic procedure which allows us to…
This paper deals with the possibilities of noise suppression in partial discharge (PD) measurements under on-site conditions. After the presentation of previous work, a new concept of designing a digital FIR filter with a fixed order to suppress narrow-band disturbances is presented. The method is compared to a design…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Molecular Composites of Functionalized PolyisocyanatesChetan A. Khatri, Milind M. Vaidya, Kalle Levon, Salil K. Jha, and Mark M. GreenCite this: Macromolecules 1995, 28, 13, 4719–4728Publication Date (Print):June 1, 1995Publication History Published online1 May…
A persistent problem in macromolecular crystallization is that of the promotion of easily and rapidly grown microcrystals to a size and quality sufficient for X-ray diffraction analysis. This is often true even for highly purified proteins, viruses and nucleic acids where recrystallization shows no benefit. It has bee…
Many important substitutions in vesuvianite involve variable H, and those that do not still perturb the local environment of the OH-anions. Consequently infrared spectroscopy of the OH fundamental and overtone regions is an important probe of local order. We have examined a series of vesuvianite crystals carefully cha…
Abstract Earlier interpretations of the conversion of the virgin smectite of the Ordovician Kinnekulle K-bentonites into the present mixed-layer illite/smectite imply that it took place through charge increase of the smectite with subsequent uptake and fixation of potassium. Recent analyses show that the layer charge…
Stromelysins, which are the metalloproteinases with the widest substrate specificities, play a critical role in tumor invasion and metastasis. We have previously reported an element (SPRE) of the stromelysin promoter located between nucleotides -1221 and -1203 that is necessary and sufficient for the control of strome…
In this paper two kinds of weak boundary layers (WBL) in synthetic vulcanized styrene-butadiene rubber are described. i) WBL produced by the presence of antiadhesion compounds of the rubber formulation (zinc stearate, microcrystalline paraffin wax). These WBL cannot be effectively removed by solvent wiping, whether fo…
Abstract Crosslinked poly(ethylene glycol)‐ block polybutadience block copolymers were obtained by coupling reaction of polybutadiene (PBd) with macromonomer azo initiators (macroinimers) or polyazoesters (PAE) in moderate yield (22–75%). NMR and FT‐IR spectroscopy measurements were used to characterize and determine…
Abstract The ozone decomposition reaction to molecular oxygen was studied in a flow reactor on a MnO2 / γ-Al2O3 / cordierite catalyst. The rate expression is found to depend on ozone concentration, rO3 = k(O3)0.68, but not on O2 or H2O partial pressure. A reaction sequence based on an ionic type intermediate with supe…
Boron nitride (BN) matrix composites reinforced by a number of different ceramic fibers have been prepared using a low‐viscosity, borazine oligomer which converts in very high yield to a stable BN matrix when heated to 1200°C. Fibers including Nicalon (SiC), FP (A1 2 O 3 ), Sumica and Nextel 440 (Al 2 O 3 ‐SiO 2 ) wer…
Abstract Cu(II) and Ni(II) complexes with three grades of carboxymethyl cellulose (CMC) with different degrees of substitution have been synthesized and characterized. Probable structures of the metal complexes are inferred from the electronic and IR spectra, elemental analysis data and magnetic moment measurements. C…
The melt-solid interface of hard spheres is studied by atomistic simulations and density-functional theory (DFT). The Monte Carlo method is used to compute density profiles for the three most important orientations of the fcc-solid--melt interface. The interface ranges in thickness from 4d for the loosely packed (110)…
The phase development, microstructure development, and Curie temperature of PbO‐BaO‐TiO 2 ‐Al 2 O 3 ‐SiO 2 glass‐ ceramics were investigated by X‐ray diffractometry, electron microscopy, and dilatometry. The primary crystalline phase was perovskite titanate, which exhibited bulk nucle‐ ation. When the samples were hea…