Materials Literature
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This report communicates the results of an international seminar which reviewed recent progress in the field of pellet-clad interaction in light water reactor fuels. It also draws a comprehensive picture of current understanding of relevant phenomena and their impact on the nuclear fuel rod, under the widest possible…
In this paper, we present a complete mathematical model of a spring-biased shape memory alloy (SMA) wire actuator driven by an electric current. The working of the SMA actuator is based on diverse physical phenomena, viz., heat convection, phase transformation, stress-strain variations and electrical resistance variat…
Abstract Soy spent flakes (SSF) is a plentiful renewable material from the waste stream of commercial soy protein extraction. SSF contains mostly soy carbohydrate and a small fraction of soy protein. Dry SSF is a rigid material and has a shear elastic modulus of ∼4 GPa. Aqueous dispersions of SSF were blended with sty…
The new selenostannate−selenide Ba 7 Sn 3 Se 13 and its quaternary substitution variants Ba 7 Sn 3 Se 13 - δ Te δ were prepared from the elements at 900 °C followed by slow cooling to 200 °C. Ba 7 Sn 3 Se 13 crystallizes in the orthorhombic space group Pnma, with lattice parameters of a = 12.748(1) Å, b = 24.891(3) Å,…
MWNT and carbon black were used to improve the thermal performance of TIM in high-brightness light emitter diode (HB-LED) packaging. Nitric acid treatment of CNT and optimized mixing procedure were used to help disperse the CNT and carbon black. SEM images indicated the uniform dispersion and strong bonding of fillers…
In situ synchrotron x-ray studies of the early-stage oxidation behavior of Cu (001) reveal that for Cu2O nanoislands, the Cu–Cu2O equilibrium phase boundary is shifted to larger oxygen partial pressure (pO2) by many orders of magnitude relative to bulk Cu2O. Real-time scattering measurements find that an ordered surfa…
We report on a high-speed flexible display based on a deformed helix ferroelectric liquid crystal (DHFLC) in a vertically aligned configuration. The mechanical stability of the flexible DHFLC display was achieved using a periodic array of columnar spacers formed directly on the top side of in-plane electrodes by the p…
The behavior of cubic $\mathrm{Zr}{\mathrm{W}}_{2}{\mathrm{O}}_{8}$ on compression in a DAC to $7.6\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ was examined in situ by a combination of synchrotron x-ray diffraction and x-ray absorption spectroscopy (XAS). These data were compared with x-ray absorption measurements on an a…
Filling-control metal-insulator transitions (MITs) and related electronic phase diagrams have been investigated for hole-doped vanadium oxides ${\mathrm{Pr}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}\mathrm{V}{\mathrm{O}}_{3}$, ${\mathrm{Nd}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{V}{\mathrm{O}}_{3}$, and ${\mathrm{Y}}_…
From inelastic neutron scattering experiments, we demonstrate quantum tunneling of the Néel vector in the antiferromagnetic molecular ferric wheel CsFe8. Analysis of the linewidth of the tunneling transition evidences coherent tunneling.
A nonplanar metallacrown [Ni-N-N]12 was achieved using a pentadente ligand, salicylaldehyde 2-pyridinecarboxylhydrazone (H2L) via a new modular self-assembly approach. The special bridging models of the ligand forced the macrocycle to form in a specific size with the wavelike conformation.
We report magnetotransport measurements on the quasi-two-dimensional charge-transfer salts ${\ensuremath{\beta}}^{\ensuremath{''}}\text{\ensuremath{-}}{(\mathrm{BEDT}\text{\ensuremath{-}}\mathrm{TTF})}_{4}[({\mathrm{H}}_{3}\mathrm{O})M{({\mathrm{C}}_{2}{\mathrm{O}}_{4})}_{3}]Y$, with $Y={\mathrm{C}}_{6}{\mathrm{H}}_{5…
In search of purity: As technologies requiring the use of carbon nanotubes become more refined, the purity of the nanotubes becomes an ever-increasingly important factor. This Highlight not only takes a look at some attempts to improve the purity of single-walled carbon nanotubes (SWNTs) but also puts forward some new…
Flower- or cake-shaped particles with uniform particle size ranging from nanometers to micrometers were prepared from the stereo multiblock copoly(rac-lactide)s (smb-PLAs) by precipitating the polymer from its solution in methylene chloride/ethanol via three different methods: slowly lowering the solution temperature,…
Visible light irradiation of 5-acyloxymethyl- and 5-phenoxymethyl-2-pyrrolidino-1,4-benzoquinones effects photoisomerization to labile oxazolidines, which undergo elimination of carboxylate or phenolate leaving groups in high yields to generate trappable o-quinone methide intermediates. [reaction: see text]
A complete procedure for the preparation of clean surfaces of especially hard ionic crystals by ultrahigh vacuum (UHV) cleavage is given and exemplified by the preparation of the (001) surface of single MgO crystals. All important tools that are needed for the preparation are explained in detail. We present a device t…
MoO3 thin films were fabricated in this work by the laser evaporation method operating in continuous wave mode. The samples were prepared at different substrate temperatures, in vacuum and at different oxygen pressures. Oxidation states of the films were obtained by X-ray photoelectron spectroscopy (XPS) and the cryst…
Discrete transition-metal nanoparticles are spontaneously formed on the sidewalls of single-walled carbon nanotubes (SWNTs), which are noncovalently functionalized with 2,2′;6,2′′-terpyridine (Terpy). Such nanotubes are electron-rich hybrid systems, which overcome the energy barrier that prohibits spontaneous electron…
We report the synthesis of aligned N-doped carbon nanotube bundles via CVD (over the temperature range 700−800 °C) using ammonium-exchanged zeolite-β as the substrate, ferric nitrate as the catalyst, and acetonitrile as the carbon precursor. Ammonium exchange of the zeolite was found to be necessary for the formation…
We report on band gap states in C-doped TiO2 films that were prepared by oxidative annealing of sputtered TiC films at 550°C in flowing O2 gas. Deep-level optical spectroscopy measurements revealed three deep levels located at ∼0.86, ∼1.30, and ∼2.34eV below the conduction band. The first level is probably attributabl…