Materials Literature
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The dependence of tunneling magnetoresistance and spin-transfer torque in FeCo/MgO/FeCo tunnel junctions on the Co concentration and the bias voltage are investigated ab initio. We find that the tunneling magnetoresistance decreases with the Co concentration, in contradiction to previous calculations but in agreement…
Formation of defects in semipolar (11¯01)-oriented GaN layers grown by metal-organic chemical vapor deposition on patterned Si (001) substrates and their effects on optical properties were investigated by steady-state and time-resolved photoluminescence (PL) and spectrally and spatially resolved cathodoluminescence (C…
The constituents of soft matter systems such as colloidal suspensions, emulsions, polymers, and biological tissues undergo microscopic random motion, due to thermal energy. They may also experience drift motion correlated over mesoscopic or macroscopic length scales, e.g. in response to an internal or applied stress o…
Low-temperature joining of semiconductor chips by sintering of silver paste is emerging as an alternative lead-free solution for die-attaching power electronic device, particularly for high-temperature applications. However, migration of sintered nanosilver should be fully understood for reliability evaluation. In thi…
BACKGROUND: Determining the safety of contrast agents is challenging. In the absence of large controlled clinical trials, non-interventional (post-marketing surveillance) studies provide an opportunity to clearly investigate the safety profile of contrast agents. PURPOSE: To assess the safety profile of iopromide in c…
Cementite dissolution in cold-drawn pearlitic steel (0.8 wt.% carbon) wires has been studied by quantitative X-ray diffraction (XRD) and Mössbauer spectroscopy up to drawing strain 1.4. Quantification of cementite-phase fraction by Rietveld analysis has confirmed more than 50% dissolution of cementite phase at drawing…
TiO 2 anatase nanocrystals were surface modified by deposition of V(V) species. The starting amorphous TiO 2 nanoparticles were prepared by hydrolytic processing of TiCl 4 -derived solutions. A V-containing solution, prepared from methanolysis of VCl 4, was added to the TiO 2 suspension before a solvothermal crystalli…
Abstract A series of hydrogels based on starch, acrylic acid (AAc) and 2‐hydroxyethyl methacrylate (HEMA), namely AAc/starch and AAc/HEMA/starch hydrogels were synthesized by gamma radiation and used to adsorb acid fast red dye from aqueous solution. Alkali treatment of AAc/starch hydrogels to improve their ionic char…
Geometric asymmetry and surface forces are used directly the shape transformation of two-dimensional nanoparticle (NP)-based ribbons into three-dimensional helices. The balance between elasticity and surface tension dictates the helical radius dimension. NP helical ribbons have exceptional mechanical properties, displ…
Abstract A series of donor‐acceptor oligomer OBTThn (n=1–7) and polymer PBTTh1 and PBTTh2 composed of alternative 2,1,3‐benzothiadiazole and 3‐hexylthiophene have been designed and synthesized for the purpose of investigation on the effect of chain length and side‐chain regioregularity on their basic properties and ph…
Side chain flexibility in perfluorosulfonic acid (PFSA) ionomers has been explored through ab initio electronic structure calculations. Three different PFSA side chain fragments were considered with a CF3CFCF3 backbone representation: Nafion (-OCF2CF(CF3)O(CF2)2SO3H), Aquivion or the short side chain (SSC) (-O(CF2)2SO…
We develop a partially solution-processed small molecule tandem organic photovoltaic cell using an organic/inorganic interlayer structure that provides efficient charge recombination while protecting underlying layers from degradation due to attack from solvents applied during the deposition of subsequent sub-cells. E…
We demonstrate the existence and control of inter-particle magnetic exchange coupling in densely packed nanostructures fabricated by focused electron beam induced deposition. With Xe beam post-processing, we have achieved the controlled reduction and eventual elimination of the parasitic halo-like cobalt deposits form…
A core element to miniaturized, hermetic encapsulations for neuroprosthetic implants with high numbers of stimulation channels is the creation of electrical feedthroughs. Platinum (Pt) and alumina (Al2 O3 ) are necessary to connect the sealed electronics to external components including electrode arrays that provide a…
The Japan Atomic Energy Agency is responsible for the procurement of the central solenoid (CS) conductor for ITER. The CS conductor uses a circular-in-square type sheath tube (jacket, outer dimension: 49 mm$\times$49 mm square, inner diameter: 32.6 mm) made of high manganese stainless steel JK2LB. The CS jacket suffer…
A new Kunitz-type serine protease inhibitor, Rhipilin-2, was identified in the tick Rhipicephalus hemaphysaloides. The cDNA sequence of Rhipilin-2 is 693 bp, and it encodes a deduced 195 amino acid protein with a size of 22 kDa. Bioinformatic analysis shows that Rhipilin-2 belongs to the Kunitz-type family of inhibito…
This work aims to establish a new three-dimensional method for automatically generating three-dimensional FEM models of two-phase composite materials with complex materials arrangement for the purpose of effective thermal conductivity (ETC) evaluation. Tests were carried out in which the shape, spatial distribution, t…
Wetting at the nanoscale is investigated and discussed in relation to samples presenting amphiphilic domains and by employing dynamic atomic force microscopy (AFM) operating in the amplitude modulation (AM) mode. First, the capability of monitoring the growth and subsequent reduction of nanoscale water films on flat a…
Solvent effects on the morphology of diketopyrrolopyrrole (DPP)‐based low band gap polymer (PDPPBT):phenyl‐C71‐butyric acid methyl ester (PC71BM) blends are studied systematically using a mixture of a non‐aromatic polar primary solvent with high boiling point (b.p.) secondary solvents of increasing polarities. An unfa…
The interparticle distance between nanoparticles (NPs) dispersed on on SiO2 was shown to be controlled by PEGylation. Ferritins with nanoparticle cores were prepared and PEGylated with poly(ethylene glycol)s (PEGs) of two different molecular weights. It was shown that the thickness of the PEG layer on the ferritin sur…