Materials Literature
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A new polymer multilayer fabrication method that employs employing thin films of lamellar polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) is presented. The effectiveness of the technique is demonstrated by patterning nanometer-scale silicon wire arrays. A multilayer patterning process that features defect-free…
Dispersion of single-walled carbon nanotubes in water with the use of sodium dodecylsulfate allows the study of properties of individual nanotubes. Nanotube isolation is maintained in the dispersions by the electrostatic repulsion between the dodecylsulfate groups adsorbed on the nanotube surface. We present data show…
A simple seed-layer assisted electrochemical deposition (ECD) route has been successfully developed for preparation of different ZnO nanostructures, and their optical and field emission properties are also studied. ZnO films, nanowires, and nanosheets could be prepared in a rational way by just controlling the ECD cur…
This work focuses on the development of electrically conducting porous nanocomposite structures by the incorporation of multiwalled carbon nanotubes (MWNT) into electrospun poly(ethylene oxide) (PEO) nanofibers. Electron microscopy confirmed the presence of individual aligned MWNT encapsulated within the fibers and sh…
We propose a two-dimensional electron gas (2DEG) system in which an external magnetic (B) field with a small chirality is applied to provide a topological U(1) U(1) gauge field that separates conduction electrons of opposite spins in the transverse direction. Additionally, the vertical electric (E) field in the 2DEG,…
We show that the propagation of spin polarized carriers may be dramatically affected by {\em inhomogeneous} electric fields. Surprisingly, the spin diffusion length is found to strongly depend on the sign and magnitude of electric field \emph{gradients}, in addition to the previously reported dependence on the sign an…
1-Thioglycerol-capped CdTe nanocrystals were used as core template to generate CdTe/CdS core−shell nanocrystals in aqueous solution by means of ultrasonic irradiation. The photoluminescence quantum yields of CdTe/CdS core−shell nanocrystals were up to 20%, larger than the original CdTe nanocrystals by around 10 times.…
Half-metallic antiferromagnets are the ideal materials for spintronic applications since their zero magnetization leads to lower stray fields and thus tiny energy losses. Starting from the Mn$_2$VAl and Mn$_2$VSi alloys we substitute Co or Fe for Mn and we show by means of first-principle electronic structure calculat…
We fabricated a current-perpendicular-to-plane pseudo-spin-valve nanopillar comprising a thick and a thin Co rings with deep submicron lateral sizes. The dc current can effectively induce the flux-closure vortex states in the rings with desired chiralities. Abrupt transitions between the vortex states are also realize…
We compared quantity and structures of food-derived gelatin hydrolysates in human blood from three sources of type I collagen in a single blind crossover study. Five healthy male volunteers ingested type I gelatin hydrolysates from fish scale, fish skin, or porcine skin after 12 h of fasting. Amounts of free form Hyp…
By using the highly oriented 1:1 stoichiometric blend of high-molecular-weight PLLA and middle-molecular-weight PDLA species and by choosing a suitable annealing condition, we have succeeded for the first time to observe the phase transition phenomenon in the heating and cooling processes by measuring the temperature…
Free radicals are generated by the collapse of ultrasound-induced cavitation bubbles when they are forcefully compressed by dynamic stimuli. Radical generation occurs as a result of the extremely high temperatures induced by adiabatic compression during the violent collapse process. It is generally believed that extre…
We report here the first example of a homogeneous first row transition-metal-based catalyst which is active for dehydrogenation of ammonia−borane, H 3 NBH 3, a promising chemical hydrogen storage material. Addition of ammonia−borane to an active catalyst formed in situ from the reaction of Ni(cod) 2 and 2 equiv of an…
The title compound, [Mn(C6H15N3)2][As2Se6], contains a sandwich-like centrosymmetric complex cation with two tridentate 9-aneN3 (1,4,7-triazacyclononane) ligands, which coordinate the MnII atom in an octahedral manner. AsSe3 pyramids are linked by two Se—Se bonds into the centrosymmetric chair-shaped six-membered…
We apply the technique of x-ray magnetic circular dichroism in total electron yield mode to study the magnitudes of the magnetic moments of Cr, Fe, and Co in Heusler alloy ${\mathrm{Co}}_{2}{\mathrm{Cr}}_{1\ensuremath{-}x}{\mathrm{Fe}}_{x}\mathrm{Al}$ epitaxial thin films, predicted to be half metallic for small value…
Thermal stability of amorphous system xFe2O[ 20Na2O30CaO50P2O5] , with mol%, was investigated by differential thermal analysis (DTA). Critical crystal radii are evaluated using the molar volumes and the thermal glass stabilities. Partial crystallisation of samples was obtained by heat treatment carried out for 24 hour…
An understanding of the adsorption behaviour of nitrogen in single-wall carbon nanotubes (SWCNTs) is necessary for obtaining information on its pores by nitrogen adsorption manometry. Non-local density functional theory was used to simulate nitrogen adsorption behaviour, including the adsorption isotherms, equilibrium…
X-ray excited optical luminescence (XEOL) and X-ray absorption near-edge structure (XANES) have been used to identify the origin of luminescence from chemical vapor deposited (CVD) diamond films. The XANES data provide direct evidence that luminescence from the CVD diamond films originates from the diamond phase, wher…
Temperature and frequency dependence of a.c. conductivity have been studied in glassy Se70Te30−xSbx (2 ≤ x ≤ 10). An agreement between experimental and theoretical results suggests that the a.c. conductivity behaviour of Se-Te-Sb system can be successfully explained by correlated barrier hopping (CBH) model. The obser…
Abstract Polypropylene (PP)/nylon 6/clay composites were prepared by compounding of PP, which had previously been treated with two kinds of silane compounds, with a master batch composed of 90 wt % of nylon 6 and 10 wt % of octadecyl amine‐modified sodium montmorillonite (NM10). The morphology of the composites was in…