Materials Literature
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We report the influence of processing atmosphere on the evolution of oxide-embedded germanium nanocrystals (Ge-NCs) formed by the thermal processing of (C 6 H 5 GeO 1.5 ) n sol−gel polymers. In an inert processing atmosphere (100% Ar), the generation of elemental Ge from thermally induced disproportionation of the ger…
In this review we examine the use of reflection absorption infrared spectroscopy (RAIRS) as a tool for studying model catalyst surfaces. Model catalysts allow us to study the structural and physical properties of their surfaces at an atomic level in a controlled environment in order to gain a fundamental understanding…
We have prepared germanium carbide (Ge1−xCx) films on Si(0 0 1) by radio frequency (RF) reactive sputtering a pure Ge(1 1 1) target in a CH4/Ar mixture discharge, and found that the sp3 hybridized carbon atoms in the Ge1−xCx film can be significantly increased in two ways. One is by increasing the Ge content via incre…
In the U.S.A., cotton is classed (primary quality parameters) by the Uster ® High Volume Instrument (HVI), which must be maintained under tightly controlled laboratory environmental conditions. Improved and fast response quality measurement systems and tools are needed to rapidly assess the quality of cotton. One key…
The synthesis of horizontal porous anodic alumina (PAA) structures with individually addressable channel systems is demonstrated. This was achieved by developing a multicontact design of aluminum finger structures (two to five contacts) on silicon wafers. These aluminum contacts were electrically isolated from each ot…
The effects of incident electron current density and temperature on the total electron emission yield of polycrystalline CVD diamond, Belhaj, M, Tondu, T, Inguimbert, V, Barroy, Pierre, Silva, François, Gicquel, Alix
Magnetic and electrical properties of ${\text{Ag}}_{2}{\text{MnO}}_{2}$ were examined by elastic and inelastic neutron-scattering measurements and by density-functional calculations. The spins of the triangular antiferromagnet metal ${\text{Ag}}_{2}{\text{MnO}}_{2}$ are found to freeze into a gapless short-range colli…
We investigate a homopolymer brush system on the basis of the wormlike-chain model, incorporating an Onsager-type interaction between polymer segments in the excluded-volume interaction. The model depends on the ratio between the total polymer length and the persistent length and a reduced grafting density as two basi…
Spin state is an important issue for many cobaltates, and an intermediate spin (IS) state having a half-filled ${e}_{g}$ orbital may well be expected for a ${\text{Co}}^{3+}$ ion in a ${\text{CoO}}_{6}$ octahedron with a remarkable tetragonal distortion. Here the single-layered perovskite cobaltate ${\text{LaSrCoO}}_{…
This paper reports on the spectroscopic properties of the 3 H 4 and 3 F 4 Tm 3+ levels in a TZN glass host with a concentration range from 0.82 to 22 × 10 20 cm −3 . Precise refractive index measurements are performed on five different wavelengths by the prism coupling method. Judd–Ofelt intensity parameters have been…
Abstract A new high‐temperature resistance polyimide foam was synthesized from 2,3,3′,4′‐biphenyltetracarboxylic dianhydride (α‐BPDA) and p ‐phenylenediamine ( p ‐PDA). The structures and foaming process of polyimide precursor powders were characterized by wide‐angle X‐ray diffractometer (WXRD) and the self‐made visua…
We report on the possible origin of electrical heterogeneities in 4 at% Al-doped ZnO (AZO) reactively sputtered films. It is found through the Zn L 3 and Al K edge x-ray absorption near-edge structure that a fraction of the Al dopant is deactivated by its positioning in octahedral conformation with oxygen. This fracti…
The effects of catalyst and external electric field on hydrogen storage were evaluated for mesoporous nickel oxide and magnesium oxide. When Pt was introduced into the metal oxides, the capacity of hydrogen adsorption increased remarkably. Furthermore, the measurements of hydrogen adsorption were also carried out on m…
Abstract Reaction of a series of dodecadentate ligands (H4L), 1,4,8,11-tetrakis(salicylideneaminoethyl)-1,4,8,11-tetraazacyclotetradecane and its substituted derivatives, with copper(II) salts afforded dinuclear copper(II) complexes, [Cu2L], which were characterized by IR and UV–vis–NIR spectroscopy, and temperature d…
We present a reaction mechanism for CO oxidation at the $\text{Ru}(0001)\text{\ensuremath{-}}(1\ifmmode\times\else\texttimes\fi{}1)$ surface. By means of density-functional theory studies, we compare the reactivity of flat and stepped regions of the Ru(0001). We find that at saturation oxygen coverage, where the flat…
The unique electronic properties of single-walled carbon nanotubes (SWNTs) can be used to generate a current response from visible light. Vertically aligned single-walled carbon nanotube arrays were created on an optically transparent electrode (fluorine-doped tin oxide coated glass, FTO) by a self-assembly process us…
The ability to alter the thermal and mechanical properties of nanostructures by tailoring nanoscale morphology has led to vast activity in applications such as high figure of merit ( ZT ) thermoelectric, microelectronic and optoelectronic devices. Two types of nanostructures that have gained significant attention are…
Here we study the calorimetric and magnetic behaviour of melt-spun LaFe 11.6 Si 1.4 , a potential magnetic refrigerant material system that exhibits the rare combination of a large entropy change and low thermal and magnetic field hysteresis. We are able to separate the calorimetric contribution from latent heat and c…
Magnetism and magnetocaloric effect in nanocrystalline La0.67Ca0.33Mn0.9V0.1O3 synthesized by nebulized spray pyrolysis, Nisha, P, Pillai, S Savitha, Darbandi, Azad, Misra, Ajay, Suresh, K G, Varma, Manoj Raama, Hahn, Horst
In this Letter, we present a simple and reproducible method for generating polystyrene (PS) nanoneedle arrays by utilizing the trapping of inorganic silica particles at the polystyrene/air interface via capillary wetting of a thermoplastic polystyrene polymer and SF(6) reactive-ion etching. A monolayer of silica micro…