Materials Literature
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Abstract This paper describes a method to obtain polymer blends by the absorption of a liquid solution of monomer, initiator, and a crosslinking agent in suspension type porous poly(vinyl chloride) (PVC) particles, forming a dry blend. These PVC/monomer dry blends are reactively polymerized in a twin‐screw extruder to…
Abstract Differential scanning calorimetric and coupled thermal differential and thermogravimetric analysis studies of propylenediammonium hexachlorobismuthate dihydrate, [NH 3 (CH 2 ) 3 NH 3 ] 3 (BiCl 6 ) 2 ·2H 2 O 2 , crystals are reported. This compound undergoes dehydration at high temperatures. The infrared and R…
Effects of hydrostatic pressure up to $11\phantom{\rule{0.3em}{0ex}}\mathrm{kbar}$ on the magnetic and transport properties of ${\mathrm{Pr}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{Mn}{\mathrm{O}}_{3}$ (PSMO) were investigated in single crystals with various doping level: $x=0.22,0.24,0.26$, in a wide range of tem…
Hall effect experiments have been carried out in diamond surface conductive channels induced by hydrogen termination. The conductivity and the Hall mobility have been studied as a function of temperature and carrier concentration. The conductivity and Hall mobility are exponentially activated with temperature, with al…
Nearly logarithmic decay is identified in the data for the mean-squared displacement of the colloidal hard-sphere system at the liquid-glass transition [W. van Megen, Phys. Rev. E 58, 6073 (1998)]. The solutions of the mode-coupling theory for the microscopic equations of motion fit the experimental data well. Based o…
The puzzle of three-dimensional magnetic interactions in the structurally two-dimensional layered-oxide ${\mathrm{Na}}_{x}{\mathrm{CoO}}_{2}$ is addressed using first-principles calculations and an analysis of the exchange mechanisms. The calculations agree with recent neutron results, favoring the antiferromagnetic s…
An axially-symmetric sheared polymer network liquid crystal (SPNLC) device is demonstrated and its performances characterized. Through analyzing the structure of this axially-symmetric SPNLC, we constructed a 3-D model to explain the observed phenomena. The simulation results agree well with the experiment. Two potent…
We have calculated the distributions of structural parameters, formation energies, and defect levels of neutral oxygen vacancies (NOV) in amorphous silica $(a\text{\ensuremath{-}}\mathrm{Si}{\mathrm{O}}_{2})$. All oxygen sites in the amorphous structure were considered as possible candidates for vacancy formation in t…
In order to decide definitely on the dependence of the intensity of the Breit-Wigner-Fano (BWF) component with the size of the bundle, we have measured the radial breathing modes and tangential modes (TMs) of well defined metallic individual single-wall carbon nanotubes (SWCNTs) and individual SWCNT bundles. In this a…
Abstract The double perovskites family A 2 MM′O 6 (A being an alkaline‐earth and M, M′ two different transition‐metal elements) is considered as a serious candidate for magnetoelectronic applications. It appears to be fundamental to understand the role of electronic parameters controlling the half‐metallic ground stat…
Benzin aus Methan: Methan kann über difunktionellen Zeolithkatalysatoren bei niedrigen Temperaturen (≤600 °C) nichtoxidativ aktiviert und in höhere Kohlenwasserstoffe umgewandelt werden (siehe Schema). Pro Mol Methanol kann so ein Mol Methan umgesetzt werden. Dieser Ansatz könnte zu einer ökonomischen Technik für die…
To produce a highly sensitive uncooled microbolometer, the development of a high-performance thermometric material is essential. In this work, amorphous vanadium–tungsten oxide was developed as a thermometric material at a low temperature of 300°C, and the microbolometer, coupled with the material, was designed and fa…
The electrical responses of vanadium pentoxide nanowires to helium gas and environmental pressures are demonstrated. The devices feature well-aligned nanowires that are oriented by electrophoresis technique in the submicron scale. The electrical conductance is found to increase and decrease upon exposure to helium gas…
A novel processing route for developing open‐cell, microcellular SiC ceramics has been developed. The strategy adopted for making microcellular SiC ceramics involved the following: (i) fabricating a formed body from a mixture of polysiloxane, phenol resin (used as a carbon source), polymer microbeads (used as sacrific…
Gasoline from methane: Methane can be activated nonoxidatively and converted into higher hydrocarbons over bifunctional zeolite catalysts at low temperatures (≤600 °C; see scheme). The amount of methane converted per mole of methanol by this process can meet or even exceed 1 mol. This approach could potentially lead t…
An experimental investigation of long-ranging surface plasmon-polariton waves guided along Bragg gratings fabricated from a thin finite width Au film embedded in a homogeneous background dielectric is reported. The operation of four grating families is demonstrated near the free space optical wavelength of 1550 nm. Th…
A silver‐based joining technique referred to as reactive air brazing has been recently developed for joining high‐temperature structural ceramic components of the type used in gas turbines, combustion engines, heat exchangers, and burners. It was found that additions of copper oxide to silver exhibit a tremendous effe…
The electronic structure and magnetic properties of Mn-doped Ge, GaAs, and ZnSe nanocrystals are investigated using real space ab initio pseudopotentials constructed within the local spin-density approximation. The ferromagnetic and half-metallicity trends found in the bulk are preserved in the nanocrystals. However,…
Pattern formation during silica biomineralization in diatoms appears to depend on long-chain polyamines as well as proteins covalently modified with polyamines (silaffins). Recently, the complete genome of the diatom Thalassiosira pseudonana has been sequenced making this species an attractive model organism for futur…
The geometrical and electronic structures of the 4 \AA{}-diam perfect and deformed (5, 3) single-walled gold nanotube (SWGT) have been studied based on the density-functional theory in the local-density approximation (LDA). The calculated relaxed geometries show clearly significant deviations from those of the ideally…