Materials Literature
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Abstract Multiple viscoelastic properties were determined for poly(methyl methacrylate) in the context of examining experimental limitations on deriving other properties from these measurements, specifically time dependent bulk modulus behavior. By means of master curves for uniaxial extension on plate and cylinder sp…
The relaxor ferroelectric lead zinc niobate (Pb(Zn 1/3 Nb 2/3 )O 3 ) has been intensively investigated, because of its large dielectric and piezoelectric properties for applications in actuators and transducers. In this study, the in‐situ behavior of the domains in Pb(Zn 1/3 Nb 2/3 )O 3 single crystals has been observ…
Abstract Isotactic polypropylene (PP) resin was doped with pimelic acid, sodium pimelate, and calcium pimelate to stimulate the growth of hexagonal crystalline polypropylene (β‐PP). The doped resin was crystallized in a differential scanning calorimeter (DSC) and during compression molding and injection molding. The e…
The reduction of [Mn(II)-salophen] derivatives [salophen = N, N ‘-ethylenebis(salicylideneaminato) dianion] led to the formation of C−C bridged dimers. Such C−C bonds function as two electron shuttles in electron-transfer reactions. The reduction of [Mn(salophen)(THF)] 2 ( 1 ) and [Mn(3,5-Bu t 4 salophen)(THF)] 2 ( 3…
Nickel oxide thin films were deposited by reactive sputtering in a 20% oxygen/argon atmosphere for use as oxygen evolution catalysts in the photoelectrochemical production of hydrogen. The optical properties of the films were also characterized to evaluate their application as window layers. The polycrystalline films…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSynthesis, Solution and Solid State Structures, and Aqueous Chemistry of an Unstable Polyperoxo Polyoxometalate: [P2W12(NbO2)6O56]12-Deborah A. Judd, Qin Chen, Charles F. Campana, and Craig L. HillView Author Information Department of Chemistry, Emory University Atlant…
The energies of strained two-member and three-member rings of ${\mathrm{SiO}}_{4}$ tetrahedra are calculated using models based on continuous ${\mathrm{SiO}}_{2}$ networks. These rings are considered to form highly reactive ``defect'' centers in vitreous ${\mathrm{SiO}}_{2}$ and at its surface. The calculations are ba…
This work takes a micromechanical approach to fabric tensile modeling. The entire uniaxial tensile stress-strain behavior of the fabric is modeled from the constitutive yarn properties (tensile, bending, flattening, and consolidation behavior) and the original fabric geometry. Techniques for measuring these yarn prope…
Tetragonal zirconia solid solutions were prepared by the additions of ceria, titania, germania, and cassiterite into 2‐mol%‐Y 2 O 3 ‐stabilized t ‐ZrO 2 (2Y‐TZP), and the effect of the dopant size on the changes in the Raman spectra of t ‐ZrO 2 was investigated. The frequencies of the Raman modes that were associated…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorBonding at Symmetric Polymer/Polymer Interfaces below the Glass Transition TemperatureYuri M. Boiko and Robert E. Prud'hommeView Author Information Centre de recherche en sciences et ingénierie des macromolécules, Chemistry Department,…
Abstract The synthesis of new functionalised macromers containing perfluoropolyether structures (PFPE) is reported. They are obtained by reaction of bis‐CH 2 OH terminated PFPE with isocyanato‐ethyl methacrylate (EIM), giving rise to the formation of perfluoropolyether bisurethane methacrylate (PFEUMA) oligomers. The…
The anatomy of the tymbal of Cyclochila australasiae was re-described and the mass of the tymbal plate, ribs and resilin pad was measured. The four ribs of the tymbal buckle inwards in sequence from posterior to anterior. Sound pulses were produced by pulling the tymbal apodeme to cause the tymbal to buckle inwards. A…
The adsorption of NO onto copper-exchanged ZSM-5 zeolite has been studied by EPR spectroscopy. A distinct Cu + −NO species possessing an end-on η 1 bent structure has been identified. Its EPR spectrum with a well-defined superhyperfine coupling with 63,65 Cu nuclei and hyperfine coupling with 14 N was interpreted in t…
Abstract Iron-manganese concretions are common in upper sola of Alfisols in the Inner Bluegrass Region of Kentucky. Their nature and quantities appear to be related to the fluctuation of seasonal perched water tables above clayey argillic horizons. This study was conducted to examine changes in the macro-and micromorp…
Indexed X-ray powder diffraction data are reported for the low temperature tetragonal ZrO 2 obtained by crystallization of zirconia gel. The structure was refined by the Rietveld technique on the basis of space group P 4 2 / nmc . Refined unit cell dimensions are a = 3.5984(5) Å, c = 5.152(1) Å, V = 66.71 Å 3 , D x =6…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTMicrostructural Analysis of a Cubic Bicontinuous Morphology in a Neat SIS Triblock CopolymerJonathan H. Laurer, Damian A. Hajduk, Jennifer C. Fung, John W. Sedat, Steven D. Smith, Sol M. Gruner, David A. Agard, and Richard J. SpontakView Author Information Department of Materia…
The heat capacity of ${\mathrm{LaCoO}}_{3}$ has been determined from 13 to 1000 K by adiabatic calorimetry. A spin transition, reported to occur between 20 and 100 K, is reflected in the heat capacity as a small, broad hump. A more substantial heat-capacity contribution, of electronic origin also, has its maximum at \…
This paper presents computer simulation studies of boron nitride using ab initio and empirical methods. Results of self-consistent DFT-LDA calculations are shown, which were performed to characterize static ground-state properties of the different BN modifications. With help of these calculations the cubic phase is pr…
Examples of experimental contact angle data for varying drop and bubble volumes on different solids whose surfaces are smooth and homogeneous, rough and homogeneous, smooth and heterogeneous, and covered with unstable organic films are presented. The ideas and theoretical models as proposed in the literature for the i…
Thiol-containing polyphenolics are enzymatically synthesized in the microstructured environment of reversed micelles. CdS semiconductor nanocrystallites, also synthesized in the water pools of reversed micelles, are then attached to these polymers through binding to the sulfhydryl groups. The polymer−CdS nanocomposite…