Materials Literature
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Abstract In this communication, we present a simple, completely reversible and well performing optical microsensor for the quantitative determination in liquid hydro‐alcoholic binary mixtures, based on the simple and low cost porous silicon (PSi) nanotechnology. In our sensor device, the transducer element is a PSi op…
Interaction of metamict zircon with solutions of various composition (H 2 O, 1 m NaCl + 0.5 m HCl, 1 m NaCl, 1 m NaHCO 3 , 0.1 m Na 2 CO 3 , 1 m Na 2 CO 3 , 2 m Na 2 CO 3 , and 1 m NaOH) was examined at temperatures of 25–800°C, pressures of 1 and 5 kbar, and exposure times of 3, 7, and 14 days. The choice of fluid co…
Semiconductor metamaterials consisting of n+-GaInAs/i-AlInAs heterostructures that support negative index modes in the mid-infrared are reported. We demonstrate negative refraction in these metamaterials for wavelengths from 9-15 μm over a wide range of incidence angles.
The reversal time of the magnetization of a single-domain ferromagnetic particle with a cubic anisotropy in the presence of a uniform magnetic field is evaluated using the Kramers escape rate theory for intermediate-to-high damping as extended by Brown [W. F. Brown, Jr., IEEE Trans. Magn. 15, 1196 (1979)] to the analo…
Abstract The Microscopy and Imaging Center at Texas A&M University is a multi-user facility involved with preparation and analysis of many different biological and materials sciences projects. Vapor stabilization and coating is an important part of our specimen preparation methodology for difficult biological and…
A new diatom taxon, Fragilaria nevadensis Linares-Cuesta &Sanchez-Castillo, was described based on light- and electron-microscope examination. It was isolated from a high-mountain lake in the Sierra Nevada (Granada, Spain), the highest mountain range in the Iberian Peninsula. The new taxon was characterised by its val…
Abstract Composite structures of p‐type meso‐porous silicon (PS) and polyaniline (PAN) have been fabricated by electrochemical polymerization process. The composite structure provides a unique way to control the conduction either through the porous silicon matrix or via the polyaniline, by changing the polarity of the…
The polarization and strain responses in ferroelectric materials are non-linear and hysteretic. A number of mathematical and phenomenological approaches have been used to describe and quantify this behavior. In order to fully describe this response dielectric and piezoelectric coefficients must include real and imagin…
Abstract Sol‐gel thin films and microcrystalline powders of SiO 2 doped with Ag and Cu were obtained under environmental conditions of pressure and temperature. The precursor material was a mixture of water, tetraethyl‐orthosilicate, ethanol and aqueous solutions of Ag and Cu salts, the components were taken in ratios…
We study the mixing of the fully symmetric modes in single-walled carbon nanotubes with ab initio calculations. With a variational model, we confirm the results from finite-difference calculations. We further analyze the effect of the mixing on the calculation of phonon frequencies and electron-phonon coupling matrix…
Abstract The synthesis, crystal structure and magnetic properties of [Mn(III)L(H 2 O) 2 ]+ClO 4 −, 1 [L = N,N′-bis(rac-3,5-dichlorosalicylidenato)-1,2-diaminopropane] are reported. Single crystal X-ray diffraction studies showed the structure to consist of [MnL(H 2 O) 2 ]+ octahedra, with trans-coordinated water molec…
Solid‐state electrochemical and XRD studies reveal that the phase relation between Na 2 ZrO 3 (s) and ZrO 2 (s) is governed by the existence of non‐stoichiometric Na‐modified cubic ZrO 2 . It leads to the splitting of the nominal Na 2 ZrO 3 /ZrO 2 (NZO) equilibrium system into two systems: . The causes extended single…
Carbon nanotubes (CNTs) represent ideal Atomic Force Microscope (AFM) tip materials due to their remarkable mechanical properties. Dynamic interactions of a Single-wall Carbon nanotube (SWCNT) indenting towards a monocrystalline hydrogen-free Silicon surface (001) are investigated using molecular dynamic simulation. T…
We have used x-ray magnetic circular dichroism to study the element specific magnetic properties of ultrathin films of the Heusler alloy Co2MnGa at room temperature. Nine films were grown by molecular beam epitaxy on GaAs substrates and engineered to vary in stoichiometry as Co1.86Mn0.99Ga1, Co1.95Mn0.98Ga1, and Co1.9…
A series of layer structural composite magnetic refrigerant materials with composition of (Gd5Si2Ge2)x(Gd)y(Gd5Si1.85Ge2.15)z was synthesized via spark plasma sintering technique. The adiabatic temperature change (ΔTad) of the composites and of the three individual components was measured directly from 245to315K with…
Implantation of silicon ions with an energy of 100 keV at a dose of 1 × 10 17 cm −2 into n -type floatzone Si does not lead to the formation of an amorphous layer. Subsequent annealing in a chlorine-containing atmosphere at 1100°C gives rise to dislocation-related luminescence. The intensity of the dominant D1 line pe…
We report results from laser light diffraction studies on the electric-field-induced dynamic modulation of the helical director configuration of SmC* liquid crystals. In contrast to what is predicted by common theoretical models for bulk samples, we found no increase of the helix pitch with increasing electric fields…
The article describes the algorithm of the edge detection in the computer application of the assessment of yarn quality. The proposed algorithm and the measurement method allows the real setting of the length and number of the protruding fibres. That solution introduces a new quality to the measurement of yarn hairine…
By considering three different experiments that might be used to measure the energy of triple junctions, we demonstrate some less than obvious properties of these defects. Grain boundary triple junctions in polycrystals are shown to have distinct energy components some of which relate to their structure, but also anot…
Soot containing Ce-, Pt-, Pt–Ce-, Fe-, and Cu-fuel-borne catalysts is generated in a diesel engine, is characterised by XRD, and studied in oxidation with O2 and NO + O2 under various reaction conditions. Fe-, Pt–Ce- and Ce-soot are oxidised at lower temperature with O2, compared with Pt-soot, and the opposite trend i…