Materials Literature
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Density functional theory was used to calculate the geometries and electronic structures of Pt adsorption on the stoichiometric RuO(2)(110) surface at different coverages. The calculated results revealed that the Pt atoms strongly adsorb on RuO(2), and two-dimensional growth up to 1.25 ML deposition is energetically f…
Three-dimensional polarization and space-charge mapping with focused thermal pulses was performed on various electret polymers. In polyvinylidene fluoride (PVDF) films with a structured polarization, a lateral resolution of 38 /spl mu/m and a near-surface depth resolution of better than 0.5 /spl mu/m was achieved. In…
Bisphenol A was polycondensed with bisphenol A bischloroformate (BABC) in CH 2 Cl 2 at 5, 20, and 40 °C using pyridine as catalyst and HCl-acceptor. The feed ratio was varied, and the maximum molecular weight was obtained with a 10 mol % excess of BABC. The MALDI−TOF mass spectra exclusively displayed peaks of cycles.…
The temperature dependence of acoustic properties of the Sn(2)P(2)(Se(x)S(1-x))(6) uniaxial ferroelectric in the vicinity of the Lifshitz point (LP) was investigated by Brillouin spectroscopy and analysed in the Landau-Khalatnikov approximation. An anomalous decrease of the longitudinal hypersound velocity in the para…
Electrical conductivity measurements were carried out on synthetic $\mathrm{Fe}\mathrm{Ti}{\mathrm{O}}_{3}$ ilmenite with a KAWAI-type multianvil high-pressure apparatus (USSA-5000). The temperature range was $300--600\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ and the pressure range was $8--16\phantom{\rule{0.3em}{0ex}}\m…
An efficient and reasonable procedure is proposed for calculating the electronic structure of carbon nanotori in terms of rotational symmetry, within the tight binding formalism. It is shown that the curvature induced σ(*)-π(*) hybridization effects play an important role in determining the electronic structure of thi…
The effects of confinement on the order-disorder transition of diblock copolymer melts are studied theoretically. Confinements are realized by restricting diblock copolymers in finite spaces with different geometries (slabs, cylinders, and spheres). Within the random phase approximation, the correlation functions are…
Electrical resistivity and magnetoresistance measurements on (La0.5Pr0.2)Ba0.3MnO3 thin films of 50 and 200nm thicknesses, irradiated by 200MeV Ag+15 ions, have been carried out. Before irradiation, all the films exhibit insulator-metal transition at a temperature (Tp) of ∼200K. After irradiation, both resistivity and…
Surface modification of nanoporous tin dioxide materials with fluorinated or perylene units is achieved with trialkynylorganotin compounds (see figure). Irreversible chemisorption occurs in solution at room temperature, yielding an organic layer at the oxide surface via the cleavage of the three tin–alkynide bonds of…
A polyaniline-based conducting composite was prepared by oxidativepolymerisation of aniline in a polyvinylchloride (PVC) matrix. The coherent free standingthin films of the composite were prepared by a solution casting method. The polyvinylchloride-polyaniline composites exposed to 120 MeV ions of silicon with total i…
The first-, second-, and third-order static and frequency-dependent polarizabilities of a series of octupolar tri-s-triazines have been investigated by using the ab initio coupled perturbed Hartree-Fock (CPHF) method. Effects of substitution have also been considered. The results show that α, β, and γ values for octup…
Carbon nanotubes (CNTs) have been successfully developed as thermal and source bumps for flip-chip high power amplifiers (HPAs). The newly developed 15 mum long CNT bumps exhibit thermal conductivity of 1400 W/m-K. A flip-chip AlGaN/GaN HEMT HPA with a gate width of 2.4 mm utilizing CNT bumps, operating voltage of 40…
3D, fully interconnected, ultraporous polymer materials are produced by assembling polyelectrolyte and protein molecular layers onto a porous co-continuous polymer-blend template that is subsequently removed by selective solvent extraction (see figure). These structures possess highly controlled, fully continuous micr…
Ag 10 Te 4 Br 3 is the first representative of an M(group 11) (poly)chalcogenide halide with covalently bonded [Te 2 ] 2 - units and isolated Te 2 - ions. It represents a new class of materials located between M(group 11) chalcogen halides, characterized by covalently bonded chalcogen structure motives, on the one han…
We report on the growth and multiferroic properties of epitaxial BiCrO3 thin films. Single phase epitaxial thin films were grown on LaAlO3 (001), SrTiO3 (001), and NdGaO3 (110) substrates by pulsed laser deposition. The films display weak ferromagnetism with the Curie temperature of 120K. Piezoelectric response and tu…
Modulated differential scanning calorimetry has been used to quantify the glass transitions of small adsorbed amounts of poly(methyl methacrylate) (PMMA) on silica. While a relatively narrow, single glass transition was found for bulk PMMA, broader two-component transitions were found for the adsorbed polymer. A two-s…
The current-voltage characteristics of layered organic crystals $\ensuremath{\theta}\mathrm{\text{\ensuremath{-}}}(\mathrm{BEDT}\mathrm{\text{\ensuremath{-}}}\mathrm{TTF}{)}_{2}M\mathrm{Zn}(\mathrm{SCN}{)}_{4}$ ($M=\mathrm{Cs},\mathrm{Rb}$) follow the power law with a large exponent (e.g., 8.4 at 0.29 K for $M=\mathrm…
P-doped ZnO films were deposited on n-Si substrate by radio-frequency magnetron sputtering. Hall measurements revealed that the films annealed in situ at 750°C in an oxygen ambient at a pressure of 1.3×10−3–3.9×10−3Pa showed p-type behavior with a hole concentration of 2.7×1016–2.2×1017cm−3, a mobility of 4–13cm2∕Vs,…
Abstract For the production of uniaxially oriented nanofibers and a three‐dimensional, biodegradable scaffold consisting of nanosized fibers, an electrospinning process was modified with a cylindrical auxiliary electrode that was connected to a spinning nozzle to stabilize the initially spun solution and a parallel‐pl…
Hydrogen bonding represents a versatile and convenient route to chemical diversity in natural and synthetic systems. It can be used to join various chemical species to one another to form products ranging from simple dimers to complex supramolecular moieties, some of which may be self-ordering.1,2 The use of hydrogen…