Materials Literature
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The nature of source/drain contacts in graphene field-effect transistors (GFETs) is investigated. We argue that the energy dispersion of the graphene portion underneath of the metal electrodes is substantially altered compared to its original. Moreover, different from other materials, the Fermi levels of these graphen…
The fusion method was used to produce PbS quantum dots (QDs) embedded in S-doped glass matrix (SiO2-Na2CO3-Al2O3-PbO2-B2O3:S). Measurements of optical absorption (OA), photoluminescence (PL) and atomic force microscopy (AFM) have been carried out in order to characterize the produced QDs. A strong red-shift observed i…
George Marsh visited GKN Aerospace's composites centre on the Isle of Wight, UK.
The influence of β crystalline form nucleating agent (β nucleator) on the mechanical properties of homo-polymerized polypropylene (PPH), random-copolymerized polypropylene (PPR), block-copolymerized polypropylene (PPB), and PPH/PPR/PPB blends was studied. Polarized optical microscopy (POM), differential scanning calor…
A hybrid solution‐coated powder method was used to reduce the sintering temperature of TiO 2 ‐modified Ta 2 O 5 ceramics. This simple and effective method allowed chemical homogenization and densification to take place below a densification‐impeding phase transformation, something that has not been achieved by traditi…
Iron and aluminum oxides are widespread in tropical environments and increase soil's isoelectric point (IP). Anion adsorption modifies the IP and the surface charge of oxidic materials. This study evaluated IP changes on A‐ and B‐horizon samples of two Brazilian Oxisols upon reaction with acetate, citrate, oxalate, ph…
Spontaneous polarization P s (T) was measured as a function of temperature in the Sn2P2 S 6 single crystals. The coefficients α, β and γ of the thermodynamic potential were determined. The order parameter critical index β′ is 0.297. Discontinuity of the heat capacity ΔC p and pressure dependence of the quantity ΔC p (…
The temperature dependence of pyroelectric and dielectric properties was measured for polycrystalline Pb[(Fe 1/3 Sb 2/3 ) x Ti y Zr z ]O 3 where x = 0.1, y = 0.4–0.5 and x + y + z = 1 in the temperature range from 300 K to 650 K. The total pyroelectric effect was determined by measuring the pyroelectric current. The c…
Abstract Low alloyed zirconium sheets (Zr702) have been cold-rolled up to 80% thickness reduction and submitted to various isothermal treatments. The aim was to identify the mechanisms which produce microstructure and texture changes during recrystallization and grain growth. XRD and texture analysis, FEG–SEM with EBS…
The coupled-wave method (CWM) has been used for transmission analysis of binary metallic gratings with narrow slots. It is proved that waveguide properties of slot determine the transmission in such gratings. For TE waves at given wavelength a minimum width of slot exists, when a considerable transmission can be achie…
Micron-sized spheres of mesoporous styrene-divinylbenzene (Sty-DVB) copolymer were produced by suspension polymerisation in the presence of inert diluents. Using these mesoporous microspheres as a template, optically stable CdS nanoparticles have been synthesized. To characterize these CdS nanoparticles, Raman spectro…
We report a combined high-temperature scanning tunneling microscopy, ion scattering spectroscopy, and photoelectron spectroscopy study of bare lanthanum aluminate [LaAlO3(LAO)] and of the initial stages of anatase TiO2 growth on LAO(001). LAO(001) exhibits mixed La–O and Al–O2 surface terminations at 400°C. Heteroepit…
Crystals of a new rare-earth borate NaNd[B6O9(OH)4], space group $$P\bar 1$$ , are prepared hydrothermally. The crystal structure of the borate is solved without a priori knowledge of its chemical formula. A new complex chain radical with the formula [B 4 T B 2 Δ O9(OH)4] ∞ 4− or 6:[4T + 2Δ] is built as follows: corne…
We report a detailed investigation of the trapping and release of charge carriers from grain boundaries in polycrystalline diamond grown by chemical vapor deposition (poly-CVD). A model for charge trapping and release is presented for samples which display very different bulk characteristics as determined by photolumi…
Abstract Recently, we have developed advanced fringe field switching (AFFS) technology with a novel outdoor readability, super high CR and high transmittance that obtained from a new electro‐optical design rule by optimization of LC electrodynamics and precise control of polarization light without transflective resin…
Abstract Organized carbon nanotubes (CNTs) have been grown at a fast rate by a gas‐phase, catalytic CVD technique at 600–750 °C for 15 min with the iron pentacarbonyl/acetylene/hydrogen system. The CNT growth at various temperatures and flow rates of iron pentacarbonyl, acetylene, and hydrogen, has been quantitatively…
In a previous programme sections of the same XLPE-insulated ac-cables were stressed under different electro-thermal conditions and for various durations. Here, thin peelings from the cable insulation have their electrical endurance compared with peelings taken from an unstressed cable section, under the same test cond…
Abstract A reference sample of sepiolite and products of its comminution by vibrating dry-milling have been studied using X-ray diffraction (XRD) line-broadening analysis, complementary field emission scanning electron microscopy (FESEM) images and surface area measurements. The apparent crystallite sizes determined v…
Polymethyl acrylic acid (PMAAc) with lower molecular weight was prepared by solution polymerization in water. A series of macromolecular rare earth complexes of PMAAc (RE‐PMAAc, RE=La,Sm,Eu,Tb,Dy) have been synthesized and well characterized by means of elemental analysis, IR, TG‐DTA analyses and fluorescence determin…
The crystalline and magnetic structures of γ-Fe 2 O 3 maghemite synthesized in porous glass in the form of nanoparticles with a mean diameter of 106(2) Å have been determined by the neutrons and synchrotron radiation diffraction methods. Nanostructured maghemite with the spinel structure has vacancies in the octahedra…