Materials Literature
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The carrier type and density in Bi2Se3 single crystals are systematically tuned by introducing a calcium (Ca) dopant. A carrier density of ~1x1017 cm-3 which corresponds to ~25 meV in the Fermi energy is obtained in both n- and p-type materials. Electrical transport properties show that the insulating behavior is achi…
We investigate the propagation and scattering of highly nonlinear waves in disordered granular chains composed of diatomic (two-mass) units of spheres that interact via Hertzian contact. Using ideas from statistical mechanics, we consider each diatomic unit to be a "spin", so that a granular chain can be viewed as a s…
Silver nanoparticles (SNPs) translocate to the brain through the blood stream after they are implanted in vivo. The aim of this study was to investigate the distribution of SNPs that crossed through the blood-brain barrier (BBB). An in vitro BBB model established by co-cultures of rat brain microvessel vascular endoth…
Biological synthesis of gold and silver nanoparticles was carried out using the bacteria Bacillus subtilis. The reduction processes of chloroaurate and silver ions by B. subtilis were found to be different. Gold nanoparticles were synthesized both intra- and extracellularly, while silver nanoparticles were exclusively…
A low‐temperature template‐free two‐step aqueous solution route has been successfully developed to prepare ZnO nanobrushes. First, hexagonal ZnO microrods were grown from the precursor solutions containing zinc nitrate hexahydrate and hexamethylenetetramine. In the second step, well‐aligned vertical ZnO nanorods were…
Abstract Cs 4 W 11 O 35 (CW) and Rb 4 W 11 O 35 (RW) belong to the class of hexagonal bronzes whose structure originates from the K x WO 3 superconductor hexatungstate. Charge‐imbalanced tungsten bronzes are dielectric materials with rich polymorphism, ferroelectric properties and second‐harmonic generation. In this w…
Photoelectron emission spectra in a photon energy range between 7.5 and 21 eV are measured for in situ grown polycrystalline Yb films. By comparing bulk and surface core level shifted 4f components we give an estimation of the effective attenuation length (EAL) for low energy (6-20 eV) electrons in Yb, establishing a…
Ein Puzzlespiel: Ein einfaches Modell für die Stabilität konjugierter Kohlenstoff-Hybridmaterialien wird vorgestellt und rechnerisch verifiziert. Auf dieser Grundlage wird eine einfache „Puzzle“-Strategie für das Design solcher Hybridmaterialien vorgeschlagen (siehe Bild; C grün, N blau, H weiß).
Abstract Major weathering sequences in soils are well established; however, knowledge on rates of mineral transformations remains unknown, because it is often difficult to date precisely soil processes. This work was carried out on soils developed on recent (< 188 y) sand dunes on the W coast of Oléron Island (Fran…
Abstract PI/SiO 2 hybrid polymers involving the in situ generation of SiO 2 particles through the sol/gel route have emerged as promising materials in many fields of modern technology thanks to their unique structural characteristics. In this paper their structural and dynamic properties were investigated by FT‐IR and…
In this study, it is demonstrated that coplanar waveguides periodically loaded with split ring resonators (SRRs) and shunt connected elements can be applied to the synthesis of composite right-/left-handed transmission lines with very good high-pass filter characteristics. By balancing the line and forcing the charact…
Magnesium hydroxide—filled polypropylene foams were prepared by a compression-molding chemical foaming process and studied considering the effects of foaming and the presence of the particles on the microstructure (cellular structure and induced particle and polymer orientations), dynamic mechanical, and flame retarda…
Rates of corrosion of low alloy ASTM A213 grade T22 boiler steel were monitored in aerated stagnant 0.50 M HCl solutions at different temperatures (283–303 K) using Tafel extrapolation method and the non-destructive electrochemical frequency modulation (EFM) technique, complemented with XPS examinations. Serine (Ser)…
We report electric field dependence of the anchoring transition in a mesogen on cooling in a cell with perfluoropolymer treated surfaces. Below a crossover voltage V(co) the transition is discontinuous between planar and homeotropic alignments, and as the temperature is lowered, the transition temperature decreases qu…
The mechanical properties of wood polymer composites consisting of polypropylene and mixed sawdust of meranti shorea spp. dominant and rice husk filler have been studied. Three different filler loadings of 50, 60, and 70 wt% were used and the process of compounding and extrusion was carried out using a twin-screw extr…
Amminelithium borohydride (LiBH 4 ·NH 3 ) is one of the most hydrogen-rich inorganic materials, showing potential application for hydrogen storage. In this paper, the dehydrogenation of LiBH 4 ·NH 3 was promoted significantly through heating in ammonia atmosphere which demonstrated that the coordinate between NH 3 and…
A dislocation segment in a crystal experiences a 'self-force', by virtue of the orientation dependence of its elastic energy. If the crystal is elastically isotropic, this force is manifested as a couple acting to rotate the segment toward the lower energy of the pure screw orientation (i.e. acting to align the disloc…
Epitaxial graphene layers grown on 6H-SiC faces were investigated for molecular adsorption by electron withdrawing NO 2 and electron donating NH 3 . From amperometric measurements performed on these samples, we observed that epitaxial graphene grown on C-face SiC mostly behaved as a p-type sensing layer in contrast to…
We study azimuthal gliding of the easy axis that occurs in nematic liquid crystals brought in contact with the photoaligned substrate (initially irradiated azo-dye film) under the action of reorienting UV light combined with in-plane electric field. For irradiation with the linearly polarized light, dynamics of easy a…
Abstract Pulsed plasma enhanced chemical vapor deposition was used to coat natural fibers of silk, wool, and cotton with poly(allyl alcohol) films. Untreated and coated fibers were characterized using X‐ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR), and scanning electron microscopy. Coate…