Materials Literature
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Kramers-Kronig type dispersion relations for integer powers of complex reflection coefficient are introduced for testing the consistency of terahertz reflection spectra. By using numerical simulations we show that such dispersion relations can be applied for distillation from data with some experimental artifacts with…
It is recalled that stress-strain incremental modelling is a common feature of most theoretical description of the mechanical behaviour of granular material. An other commonly accepted characteristics of the mechanical behaviour of granular material is the Rowe's relation which links the dilatancy K to the ratio B of…
The O(oxygen)-M(metal)-O(oxygen) molecule is a basic unit of high-temperature superconducting cuprates and colossal magnetoresistance exhibiting manganates. This molecule can be regarded either as an element of a linear chain or as an ingredient of the corresponding cuprate or manganate lattice. The symmetry of the un…
We extend Merrifield's Variational Ansatz in the variational band theory of polarons to cover a frame of two electronic bands mixed by an Einstein phonon. The Hamiltonian is composed of the local and hopping energy terms, the vibrational energy, and a band-mixing term linear in the electron-phonon coupling. The eigens…
We report the atomic-scale imaging with concurrent transport measurements of the breakdown of individual multiwall carbon nanotubes inside a transmission electron microscope equipped with a piezomanipulator. We found unexpectedly three distinct breakdown sequences: namely, from the outermost wall inward, from the inne…
Gold nanoclusters (phi = 1.3 nm) stabilized by poly(N-vinyl-2-pyrrolidone) (Au:PVP NCs) readily oxidize benzylic alcohols to the corresponding aldehydes and/or carboxylic acids under ambient temperature in water. Kinetic measurement revealed that smaller Au:PVP NCs exhibit higher catalytic activity than larger (9.5 nm…
Autocollimators comply with the requirements of different metrological measurement tasks. These instruments are compact, versatile and easy to use. Angle deviations of prisms, polygons, e.g., are measured with autocollimators. If calibrated electronic autocollimators are used, then the measurements can be performed wi…
Tetragonal ZrO 2 (t‐ZrO 2 ) nanoparticles (diameter: ca. 10 nm; BET‐specific surface area: 100 m 2 /g) are hydrothermally prepared via crystallization of 1,12‐diaminododecane (DADD)‐hydrous zirconia gels at 230°C for 3 days. The volume content of monoclinic phase is ca. 0.1. The surface‐adsorbed hydrocarbon layer (ca.…
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…