Materials Literature
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Recent experiments discovered an order-disorder transition occuring at low temperatures in large unit 1/1 cell cubic approximants of the stable Cd-based binary alloy quasicrystals. The transition is related to correlations among orientational degrees of freedom whose separations are around 12 Å. We analyze the interac…
We identify several new quasicrystal approximants in alloy systems in which quasicrystals have not been previously reported. Some occur in alloys with large size contrast between the constituent elements, either containing small Boron atoms, or large Ca/Eu atoms, leading to quasicrystal structures quite different from…
Structural and magnetic properties have been studied for polycrystalline Zn1−xTMxO, where TM (transition metal ions)=Mn, Fe, and Co. No bulk ferromagnetism was observed for single-phase materials, contrary to the existing theories. Single-phase samples demonstrate paramagnetic Curie–Weiss behavior with antiferromagnet…
Catalytic palladium (Pd) nanoparticles on electrospun copolymers of acrylonitrile and acrylic acid (PAN-AA) mats were produced via reduction of PdCl 2 with hydrazine. Fiber mats were electrospun from homogeneous solutions of PAN-AA and PdCl 2 in dimethylformamide (DMF). Pd cations were reduced to Pd metals when fiber…
Depolymerization of poly(butylene terephthalate) (PBT) waste sample was undertaken with aqueous as well as alcoholic (methanolic and ethanolic) solutions of potassium hydroxide at various temperatures (35–98°C) for various time periods (0.5–60 min) at atmospheric pressure in a batch operation. Methanolic alkaline solu…
Laboratory scale tests were developed to study the high consumption of water in a tannery in Toluca City, Mexico, needed to decrease the biological oxygen demand (BOD) in the wastewater. Biological oxygen demand is generally reduced by reducing the organic material with sodium hypochlorite. However, Cr(VI) is formed i…
We describe lithography-free fabrication of sub-micron surface features on quartz substrates by the reactive ion etching (RIE) in a CF4/Ar atmosphere. These submicron glass columns are well defined, have a high aspect ratio, with the underlying substrate being very flat. The geometry of the fabricated surface columns…
High nitrogen contents in solid solution as well as appropriate strengthening mechanisms in austenitic stainless steels can result in very high corrosion resistance. This is true in both air environment and in simulated human body fluids (corrosion fatigue). High cycle corrosion fatigue data are listed and compared wi…
Depolymerization of waste poly (ethylene terephthalate) and poly (butylene terephthalate) were undertaken in various alkaline solutions at different reaction parameters at 1 atm in a batch operation. Results were evaluated in terms of weight loss of both the waste polyesters as well as products obtained during depolym…
Blends of styrene butadiene rubber (SBR) with maleic anhydride grafted whole tire reclaim (MA-g-WTR) have been prepared and the cure and mechanical properties have been studied with respect to the reclaim content. The grafting was carried out in the presence of dicumylperoxide (DCP) in a Brabender Plasticorder at 150°…
Charge redistribution in organic/inorganic heterojunction between poly(3,4-ethylenedioxy thiophene)/poly(styrenesulfonate) polymer (PEDOT/PSS) is observed contact-less by infrared spectroscopic ellipsometry. Hole accumulation or depletion layer formation is detected according to the different work functions of n- and…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTTemperature Dependence of the Structure and Interaction of Starlike PEG-Based Block Copolymer MicellesCornelia Sommer and Jan Skov PedersenView Author Information Department of Chemistry and iNANO Interdisciplinary Nanoscience Cente…
The electrical assisted laser floating zone (EALFZ) solidification process makes the tailoring of fibre microstructures possible. The application of a dc electrical current of during the solidification process of Bi2Sr2Ca2Cu4O11 nominal composition fibres strongly modified phase development, crystal shapes and effecti…
Control of silicon carbide (SiC) polytype formation has been achieved. 3C, 2H, and 4H SiC heteroepitaxial films are fabricated on a sapphire (0001) substrate at a low temperature of 1100 °C using a pulsed-laser deposition (PLD) method. Images made by transmission electron microscopy clearly show that each film consist…
We have made ultrasonic measurements of ${\mathrm{Pr}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ $(x=0.35,$0.40,0.50) with the colossal magnetoresistance in order to investigate the lattice effects due to orbital and charge degrees of freedom in the systems. As a result, we observe three types of elastic…
We have developed a multisample film growth method on a temperature-gradient substrate holder to quickly optimize the film growth temperature in pulsed-laser deposition. A smooth temperature gradient is achieved, covering a range of temperatures from 200 to 830 °C. In a single growth run, the optimal growth temperatur…
The high-temperature transformation of ${\mathrm{CsH}}_{2}{\mathrm{PO}}_{4}$ was studied by means of impedance spectroscopy, differential thermal analysis, and thermogravimetric methods. The dielectric constant showed a high-temperature anomaly around ${T}_{p}=230\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}.$ The the…
The manganese oxo-cluster, [Mn 12 O 12 (O 2 CMe) 16 (H 2 O) 4 ]·2(HO 2 CMe)·4(H 2 O), (Mn-12), has been the subject of intense interest for its novel magnetic properties. Although it is a model system for nanoscale magnetic data storage, no methods for forming films or attaching the cluster to surfaces have been repor…
The room temperature magnetization of GaMnN films grown by molecular beam epitaxy on (0001) sapphire substrates with Mn concentrations varying from 0 to 9 at. % was found to depend on Mn concentration, with a maximum magnetization found at ∼3 at. % Mn. High-resolution x-ray diffraction measurements show that the c-pla…
A new beamline (MPW6.2) has been designed and built for the study of materials during processing where three synchrotron techniques, SAXS, WAXS and XAS, are available simultaneously. It has been demonstrated that Rietveld refinable data can be collected from silicon SRM 640b over a 60 degrees range in a time scale of…