Materials Literature
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D-Lactose-O-(vinylbenzyl)oxime (LVO), prepared from α-D-lactose and [O-(vinylbenzyl)oxy]amine (1) was copolymerized with styrene (ST) in dimethylsulfoxide (DMSO)-toluene (1 : 1, v/v) at 65°C using 2,2′-azobisisobutyronitrile (AIBN) as a free radical initiator. The polymerization was rapid when using AIBN as the initia…
Diffusion data for amorphous binary alloys are scarce in the literature. There are no data available for the diffusion of Al in Al–Pt amorphous phase known to the authors. High-temperature successive deposition of components was used in the present experiments to reveal the elementary processes of reactive diffusion f…
The linear viscoelastic behavior of a poly(paraphenylene) with a benzoyl substituent has been examined using tensile, dynamic mechanical, and creep experiments. This amorphous polymer was shown to have a tensile modulus of 1–1.5 Msi, nearly twice that of most common engineering thermoplastics. The relaxation behavior,…
The low-temperature polycondensation of trans-azobenzene-4,4′-dicarbonyl chloride with (S)-(−)-1,1′-binaphthyl-2,2′-diamine and/or 1,4-bis(3-aminophenoxy-4′-benzoyl)benzene afforded a new series of poly(aryl ether ketone amide)s with both fixed and photoinducible kinking elements positioned randomly along the main cha…
We report the application of an ultrasonic shear wave reflection technique for the investigation of film formation and crystallization kinetics of one amorphous and two semicrystalline polychloroprene samples with different gel content. Both isothermal and temperature-dependent measurements of the complex dynamic shea…
Polyethylene produced by a vanadium-based polymerization catalyst contains long-chain branching as determined by NMR and rheology, even though the polymer has very low levels of vinyl unsaturation. A new mechanism is proposed for the formation of the long-chain branching, which involves CH bond activation of the poly…
The effect of fullerene (C60) on the radical polymerization of methyl methacrylate (MMA) in benzene was studied kinetically and by means of ESR, where dimethyl 2,2′-azobis(isobutyrate) (MAIB) was used as initiator. The polymerization rate (Rp) and the molecular weight of resulting poly(MMA) decreased with increasing C…
Photoluminescence and photoluminescence excitation (PLE) spectroscopy have been carried out on the ∼1550 nm I413/2→I415/2Er3+ emission from thin films of Er-doped As40Ge10Se25S25 glass deposited on silicon substrates by radio frequency sputtering. The PLE spectroscopy shows that the Er3+ emission is excited in the 1-μ…
Polarized Raman scattering by phonons is used to characterize thin films prepared by laser ablation of La1−xCaxMnO3 targets. It was found that, in the temperature range from 6 to 300 K, phonon spectra of La0.7Ca0.3MnO3 films exhibit observable differences from those in bulk materials (microcrystalline ceramics and sin…
We report the observation of a giant magnetoresistance effect in a low-temperature (LT-)GaAs/MnAs nanoscale ferromagnet hybrid structure. The MnAs nanomagnets are formed by ion implantation of Mn into LT GaAs and subsequent annealing. We have studied the magnetotransport using a vertically biased p+-GaAs/LT-GaAs:MnAs/…
The aging behavior of the ac susceptibility of randomly substituted ${\mathrm{K}}_{1\ensuremath{-}x}{\mathrm{Li}}_{x}{\mathrm{TaO}}_{3}$ crystals reveals marked differences with spin glasses in that cooling rate effects are very important. The response to temperature steps (including temperature cycles) was carefully…
Single bubble sonoluminescence stability in ambient radius ( ${R}_{0}$), drive pressure ( ${P}_{a}$) phase space is examined for water partially saturated with pure argon, pure nitrogen, and argon/nitrogen mixtures in order to examine the dissociation hypothesis (DH) of Lohse and Hilgenfeldt [J. Chem. Phys. 107, 6986…
A very large optical absorption increase induced by continuous-wave laser irradiation is reported for free-standing porous silicon films oxidized at 800–950 °C. A maximum reversible optical-density change of 2.5 is obtained with a pump laser intensity of ∼20 W/cm2. The induced absorption is found to be strongly decrea…
The electrical conductivity and the conductivity relaxation of the fluoride glasses in the system with LiF content ranging from 10 to 60 mol% have been investigated in the frequency range 10 Hz-2 MHz and in the temperature range from 300 K to just below the glass transition temperatures. The conductivity shows a minim…
<div class="htmlview paragraph">A material selection including a natural material is conducted using a Simplified Life Cycle Assessment (SLCA) according to SETAC within the framework of Ford's Design for Environment (DfE) process. The aim has been to check both, the environmental performance of a design option c…
Abstract
We report the first experimental evidence of the cyclic form of ozone, found in three air stable surface reconstructions of MgO (111) annealed above 1450 \ifmmode^\circ\else\textdegree\fi{}C. The $\mathrm{MgO}(111)\ensuremath{-}(\sqrt{3}\ifmmode\times\else\texttimes\fi{}\sqrt{3})R30\ifmmode^\circ\else\textdegree\fi{}$…
We study the liquid anomalies arising from the Stell-Hemmer interaction, using molecular dynamics simulations and approximate 2D solutions. We observe in the liquid phase three types of anomalies: (i) An increase in specific volume upon cooling, (ii) an increase in isothermal compressibility upon cooling, and (iii) an…
The evolution of three-dimensional strain states and crystallographic domain structures of epitaxial colossal magnetoresistive La0.8Ca0.2MnO3 films have been studied as a function of film thickness and lattice mismatch with two types of (001) substrates, SrTiO3 and LaAlO3. In-plane and out-of-plane lattice parameters…
We use a Monte Carlo bond-switching method to study systematically the thermodynamic properties of a ``continuous random network'' model, the canonical model for such amorphous systems as $a$-Si and $a\ensuremath{-}{\mathrm{SiO}}_{2}$. Simulations show first-order ``melting'' into an amorphous state, and clear evidenc…