Materials Literature
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Abstract Blend films were prepared from hydrophobic poly( L ‐lactide) (PLLA) and hydrophilic poly(vinyl alcohol) (PVA) with different PLLA contents [ X PLLA (w/w) = PLLA/(PVA + PLLA)] by solution casting and melt quenching. Their morphology, swelling behavior, and surface and bulk properties were investigated. Polariz…
Cobalt(III) porphycenes, structural isomers of cobalt(III) porphyrins, catalyze the addition of alcohols to vinyl ethers in a toluene−dioxane solution containing alcohol and Et 3 N as well as the autoxidation of the resultant metal-bound adduct; this produces two acetals, namely, those of β-formylacetaldehyde and β-hy…
Abstract Schottky barriers of the type Au/polypyrrole/Al (or In) were made in sandwich configuration. The conductivity of polypyrrole was tuned to be on the order of 10 −3 ohm −1 cm −1 by its electrodeposition from a novel ambient temperature ternary eutectic melt consisting of acetamide, urea, and ammonium nitrate. T…
By means of scanning cathodoluminescence (CL) measurements, high-resolution transmission electron microscopy (HRTEM), and electron energy loss spectroscopy (EELS), we have studied the origin of the band-$A$ emission in homoepitaxial diamond thin films grown using microwave-plasma chemical vapor deposition (CVD). A bro…
The theoretical basis for the phenomenon of quantum sieving is detailed for confined one-dimensional systems. A simple theory is presented to calculate zero-pressure selectivities due to quantum sieving in nanopores. This simple theory is used to evaluate the ability of various carbon nanotubes and interstices of nano…
The magnetic susceptibility \ensuremath{\chi}, heat capacity, and electrical resistivity \ensuremath{\rho} under pressure have been measured on ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7}$ and ${\mathrm{La}}_{4}{\mathrm{Ni}}_{3}{\mathrm{O}}_{10}.$ Heat-capacity measurements reveal electronic heat-capacity coef…
In this paper we have investigated the effects of sintering time and temperature on the formation and critical current densities of Fe-clad MgB2 wires. MgB2 wires were fabricated using the powder-in-tube process and sintered for different periods of time at predetermined temperatures. All the samples were examined usi…
In a series of recent papers van Gastel et al have presented first experimental evidence that impure, Indium atoms, embedded into the first layer of a Cu(001) surface, are not localized within the close-packed surface layers but make concerted, long excursions visualized in a series of STM images. Such excursions occu…
We studied the correlation between magnetic, electrical, structural, and magnetostriction properties of the electron doped manganites Ca$_x$Sm$_{1-x}$MnO$_3$ (x = 0.85, 0.8). The paramagnetic to antiferromagnetic transition in both the compounds while cooling is accompanied by an abrupt increase of the spontaneous vol…
We present in-situ transmission electron microscopy observations of domain wall motion in thin freestanding potassium niobate single-crystals. We observe that not all domains of a given polarization orientation are equally switchable in applied electric fields. Tilted and curved 90 degree domain walls are common and d…
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ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTWater-Soluble Conjugated Oligomers: Effect of Chain Length and Aggregation on Photoluminescence-Quenching EfficienciesBrent S. Gaylord, Shujun Wang, Alan J. Heeger, and Guillermo C. BazanView Author Information Departments of Chemistry and Materials University of Calif…
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Electronic structure and bonding in metal phthalocyanines (Metal=Fe, Co, Ni, Cu, Zn, Mg) is investigated in detail using a density functional method. The metal atoms are strongly bound to the phthalocyanine ring in each case, by as much as 10 eV. The calculated orbital energy levels and relative total energies of thes…
We report the realization of an ultraviolet light-emitting diode with the use of a diamond pn junction. The pn junction was formed from a boron-doped p-type diamond layer and phosphorus-doped n-type diamond layer grown epitaxially on the 111 surface of single crystalline diamond. The pn junction exhibited good diode c…
The values of longitudinal nuclear spin relaxation rates for the 199 Hg (spin-1/2) and 14 N (spin-1) nuclei and of the quadrupolar cross-correlation coefficient for the 14 N nuclei are determined for a toluene solution of bis(hexamethyldisilylamido)mercury(II) in a broad temperature range. Estimates of the latter quan…
Abstract Novel crosslinkable fluorinated oligoimides were prepared in two steps. The first involved the synthesis of oligoimides terminated with nadic or allylic double bonds, and the second step was materialized either by a radical addition of mercaptotrialkoxysilane derivatives onto nadic double bonds or a hydrosily…
Abstract We carried out the polyaddition of dye‐embedded diols with diisocyanates to obtain novel nonlinear optical (NLO) polyurethanes, where the NLO units were embedded in the polymer backbone. The obtained polymers showed high glass‐transition temperatures (138–184 °C) and thermal stability (temperature of 10% weig…
Halide lattices singly doped with ${\mathrm{Os}}^{4+}$ or ${\mathrm{Er}}^{3+}$ are both known to show visible upconversion luminescence upon excitation around 10 000 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$. In this study, we analyze the cooperative processes in ${\mathrm{Cs}}_{2}{\mathrm{NaYCl}}_{6}$ codoped with $…
Electron absorption, excitation and emission as well as electron spin-resonance spectra were measured for orthorhombic (K, Rb, Cs) and monoclinic (Li, Na) M I Cr x In 1- x (MoO 4 ) 2 ( x = 0.5-2%, M I = Li, Na, K, Rb, Cs) in the temperature range 5-300 K. The local structure of the Cr 3+ ions is discussed on the basis…