Materials Literature
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Changes in appearance and in the chemical and mechanical properties of films of Liquitex acrylic gloss medium, a commercial artists' medium based on an acrylic polymer dispersion, have been studied during natural aging in the dark and in accelerated thermal and light exposure tests. In dark storage at room temperature…
Abstract Samples of poly(etherether ketone) (PEEK) were subjected to large plastic deformations under uniaxial tension and simple shear by means of a new video‐controlled testing method at constant true strain rate. The “equivalent” stress‐strain curves obtained under the two loading modes are close at the yield point…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray structure analysis of a wholly aromatic polyimide with a rigid-rod chainYutaka Obata, Kenji Okuyama, Sonoko Kurihara, Yukishige Kitano, and Takuma JindaCite this: Macromolecules 1995, 28, 5, 1547–1551Publication Date (Print):February 1, 1995Publication History Publishe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray Structure of a New Hydrosol of Gold ClustersWalter Vogel, Daniel G. Duff, and Alfons BaikerCite this: Langmuir 1995, 11, 2, 401–404Publication Date (Print):February 1, 1995Publication History Published online1 May 2002Published inissue 1 February 1995https://doi.org/10…
The contrast in electron channeling patterns is quantitatively treated using a theory in which electrons in Bloch states excited by the incident electron are scattered through large angles by the fluctuation part of the potential (thermal diffuse scattering). The subsequent multiple elastic and inelastic scattering is…
Abstract Magnetic resonance imaging (MRI) is used to measure the time evolution of the volume fraction vs. height profile during batch sedimentation of rod‐like particle suspensions. At any instant during sedimentation, MRI clearly delineates the supernatant, suspension, and sediment regions. The rod‐like particles wi…
Theoretical potential‐pH equilibria and anodic polarization studies were used to show that formation of the aqueous complex in at ∼24°C promotes active behavior of copper at in a manner similar to that observed in chloride solutions. A region of apparent Tafel behavior is observed with a position and slope of 60 mV th…
The vibronic origin of ferroelectricity and structural phase transitions first suggested three decades ago, has been given recently new theoretical foundation and strong experimental evidence. It has been shown that for any polyatomic system, including crystals, the vibronic mixing of the ground electronic state of th…
3-Dimensional aromatic moiety was used for the first time in the synthesis of liquid crystals. Several of the prepared compounds, based on σ- aromatic boron clusters 1 and 2, show only nematic mesophases with relatively high Ti, good electrochemical but limited thermal stability. Absorption and emission spectra of pyr…
Abstract— The hematoporphyrin‐sensitized production of singlet molecular oxygen, O 2 ( 1 Δ g ), has been investigated in methanol and in aqueous solution. The quantum yield for formation of O 2 ( 1 Δ g ) (Φ Δ ) has been measured by both steady‐state (oxygen consumption) and time‐resolved (near‐infrared luminescence) m…
Abstract A finite element simulation is proposed for the shaping of glass fiber fabric. The overall mechanical behavior of the fabric is obtained by combining the tensile behavior of a single thread and the current position of threads in the fabric. The constitutive model for a single thread in tension is based on a s…
Discotic liquid crystals represent a promising class of new materials, for example, with respect to their photoconductivity properties. To tailor the processability and mesophase behaviour of such materials, specifically functionalized cores are required as precursor molecules for discotic oligomers, polymers and netw…
Reactive porous rods of poly[(chloromethyl)styrene-co-divinylbenzene] have been prepared for the first time by copolymerization of the monomers in the presence of a porogenic diluent. A two-step modification process involving reaction with ethylenediamine followed by reaction with gamma-gluconolactone leads to a porou…
For nearly symmetric binary fluid mixtures, the coupling between concentration and velocity fields leads to a quick hydrodynamic coarsening: For bicontinuous phase separation, the pattern evolution is known to be governed by tube hydrodynamic instability. The interface tension is a driving force in the hydrodynamic co…
Abstract The dynamics of a large number of bubbles separated by distances of the order of their radii in highly viscous fluids with specific application to foams is investigated. The growth of bubbles is due to diffusion of gas from the fluid and the momentum transfer between the fluid and the bubbles. Equations gover…
Experimental observations performed on polycrystalline Cu-based Shape memory alloys exhibit assymmetrical responses for tensile or compressive test.We used a micromechanical point of view to determine the physical origin of this dissymmetry.At first approximation, we assume that the stress field is uniform inside the…
Nanocomposite materials in the form of nanometer‐sized second‐phase particles dispersed in a ceramic matrix have been shown to display enhanced mechanical properties. In spite of this potential, processing methodologies to produce these nanocomposites are not well established. In this paper, we describe a new method f…
X‐ray photoelectron spectroscopy (XPS) has been used to study surface segregation in 9.5 mol% single‐crystal Y 2 O 3 ‐ZrO 2 which has been subjected to air anneals at temperatures ranging from 900° to 1500°C. The kinetics of segregation reveal an enrichment of Y, Si, Na, and Fe at short times; however, at longer times…
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<div class="htmlview paragraph">Vacuum insulation and phase-change thermal storage have been used to enhance the heat retention of a prototype catalytic converter. Storing heat in the converter between trips allows exhaust gases to be converted more quickly, significantly reducing cold-start emissions. Using a s…