Materials Literature
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The mesomorphic behaviour of a liquid crystalline sheet-shaped 2,4,6-triarylaminothe 1,3,5-triazine bearing six peripheral decyloxy chains has been investigated in binary mixtures with two-fold alkoxy substituted non-mesomorphic benzoic acids. Each investigated equimolar mixture exhibits an enantiotropic columnar phas…
Experimental studies were carried out on infrared-active phonons in the Aurivillius ferroelectric ${\mathrm{SrBi}}_{2}{\mathrm{Ta}}_{2}{\mathrm{O}}_{9}$ (SBT), using reflectivity measurements (down to $200{\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$) and transmission measurements (down to $100{\mathrm{cm}}^{\mathrm{\ensu…
Hot‐stage transmission electron microscopy studies of lanthanum‐modified lead zirconate titanate (Pb 1‐ x La x ‐(Zr 0.53 Ti 0.47 ) 1‐ x /4 O 3 (PLZT 100 x /53/47) have been performed for compositions close to the morphotropic phase boundary (MPB). These studies have revealed the coexistence of relaxor and normal ferro…
A nonbarotropic continuum bubbly mixture model is used to study the one-dimensional cavitating flow through a converging-diverging nozzle. The nonlinear dynamics of the cavitation bubbles are modeled by the Rayleigh-Plesset equation. Analytical results show that the bubble/bubble interaction through the hydrodynamics…
Abstract The network density in unfilled EPDM vulcanizates was studied by the following methods: low resolution, proton T 2 NMR relaxation, Mooney—Rivlin analysis of stress—strain curves, and equilibrium swelling experiments. For the vulcanizates as such, the NMR method measures the total network density, which is com…
Deposition of metallic iridium thin films has been achieved by sputtering an Ir target with argon. The deposition of the Ir films was investigated at argon gas pressures in the (10–40) mTorr range with various rf power densities. The stress, resistivity, and structure of the Ir films were systematically determined as…
The effect on the Hall hole concentration and the thermoelectric coefficient of various elemental impurities in SnTe containing excess Te and in some solid solutions based on it is investigated in the temperature interval 300–900 K. The variation of the kinetic parameters is treated on the basis of the concept of reso…
The Potts Monte Carlo simulation was used to simulate microstructural evolution in uranium dioxide fuel rods. During service, grain growth, pore migration, and thermal segregation of the pores and UO 2 occur in the rods in a thermal gradient. In this investigation, we developed a model which simulates simultaneous gra…
A composite oxide containing samaria‐doped ceria [SDC, ( CeO 2 ) 0.8 ( SmO 1.5 ) 0.2 ] and yttria‐stabilized zirconia [YSZ, ( ZrO 2 ) 0.92 ( Y 2 O 3 ) 0.08 ] was developed as an electrolyte for a solid oxide fuel cell (SOFC). A SOFC with a YSZ electrolyte was characterized by a high open‐circuit voltage (OCV) and a st…
Plasticized polyvinyl chloride (PVC), although not a blood-compatible polymer, is the material of choice for the manufacture of blood bags and hemodialysis tubing throughout the world. PVC is usually plasticized with di-(2-ethylhexyl phthalate) (DEHP) to impart flexibility and low temperature properties to the final p…
We have measured the (cubic-lattice-approximation) elastic moduli of optical melt-zone-grown single-crystal ${\mathrm{La}}_{0.83}{\mathrm{Sr}}_{0.17}{\mathrm{MnO}}_{3}$ using resonant ultrasound spectroscopy. We observe the structural transition at 285 K to be hysteretic in the ambient (almost zero) magnetic field. A…
We present results of high-pressure single-crystal x-ray-diffraction studies and ab initio pseudopotential calculations of stoichiometric ${\mathrm{TiS}}_{2}$. Neither present any evidence for a structural phase transition; it is shown that the material undergoes an isostructural semiconductor-semimetal phase transiti…
Prolonged photoirradiation induces a volume expansion and causes a decrease in the optical bandgap (photodarkening) in well annealed amorphous chalcogenides. A microscopic mechanism for the origin of these changes is proposed in terms of the repulsive Coulomb force between layered clusters which can be negatively char…
The classical spherical cap geometry which is used to define the shape of sessile drops resting on polymer surfaces has a deficiency, since it is a two-parameter model of the three measurable drop dimensions: contact angle, base radius, and height. In this paper, mathematical expressions for a drop having all three me…
We show that when a typically antiferroelectric material such as ${\mathrm{PbZrO}}_{3}$ or ${\mathrm{BiNbO}}_{4}$ is deposited as a thin film on a semiconducting substrate (Si), it displays ferroelectric behavior below a critical film thickness characteristic of the system. In an attempt to understand this ``size effe…
The bifunctional P-protein, which plays a central role in Escherichia coli phenylalanine biosynthesis, contains two catalytic domains (chorismate mutase and prephenate dehydratase activities) as well as one R-domain (for feedback inhibition by phenylalanine). Six genes coding for P-protein domains or subdomains were c…
Detailed measurements of the acoustic emissions from single-bubble sonoluminescence have been made utilizing both a small 200-μm aperture PVDF needle hydrophone, and a focused 10-MHz transducer. Signals obtained with the needle hydrophone show a fast (5.2 ns), probably bandlimited rise time and relatively large pulse…
The effect of curing temperature on the electro-optic behaviour and network morphology of reverse mode polymer stabilized cholesteric textures (PSCTs) has been studied. Scanning electron micrographs indicate that increasing the curing temperature generally results in a larger average void size within a polymer network…
An inexpensive electrochemical capacitor system with an asymmetric configuration is demonstrated. The system includes heteropolyacids and a proton‐exchange polymer membrane. Heteropolyacid electrodes show facile redox processes and host large amounts of easily accessible mobile protons required for charge balance. The…
Recent studies of potential components for nanomachines reveal that for a wide variety of structures, the rigidity of the structure is a key element in its proper performance. Vibrational analysis is an ideal way to study structural rigidity, but standard methods of molecular vibrational analysis are computationally p…