Materials Literature
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The straightforward, efficient, solventless, RAPET (reactions under autogenic pressure at elevated temperature) approach was explored for the fabrication of core-shell nanomaterials. Carbon-encapsulated SnS and SnSe nanorods were synthesized by a one-step thermal decomposition of tetramethyltin in the presence of eith…
The presence of polarization-induced electric fields of some ${10}^{8}\phantom{\rule{0.3em}{0ex}}\mathrm{V}∕\mathrm{m}$ in $(\mathrm{Zn},\mathrm{Cd})\mathrm{O}∕\mathrm{ZnO}$ quantum well structures is uncovered by a low-energy shift of the photoluminescence of several $100\phantom{\rule{0.3em}{0ex}}\mathrm{meV}$ as we…
Context. Silicate dust grains exist in a wide range of astronomical environments and understanding the effect of these on grain structure is of great interest, particularly the effect of thermal annealing on amorphous silicates as a possible route to the formation of crystalline grains. Although laboratory simulations…
Through 2-DE based quantitative proteomics, the dynamic characteristics of overall proteome profiles of Escherichia coli BL21(DE3) were systematically analyzed in the presence of four different stressors. Dithiothreitol and 2-hydroxyethyl disulfide are a reducing and an oxidizing agent, respectively, which disturb the…
Boron is ubiquitous in nature at low levels and is only rarely found in high-grade deposits that are suitable as an economic ore body. Only a few commercially important borate mineral deposits are known, and their genesis is associated with boron transport to the surface in geothermal waters associated with volcanic a…
The failure probability of anode supported solid oxide fuel cells (SOFCs) was analyzed combining experimental results of residual and fracture stress measurements. Oxidized and reduced anode/electrolyte half-cells composed of standard Ni and yttria stabilized zirconia materials were tested. The residual stresses were…
Ceramic matrix composites fabricated using Nicalon fiber and several pofysilsesqui-oxane-derived Si-C-O matrices were characterized by optical and scanning electron microscopy and in four-point bending. Material variables include three Nicalon sizings, poly(vinylacetate), epoxy and DCC-1, two different copofymer compo…
Armor-grade SiC and TiB2 cylinders (25.4 mm × 25.4 mm) were impacted with WC-6C0 spheres (6.35 mm diameter) at velocities between 50 m/s and 500 m/s. The recovered cylinders were subsequently sectioned and metallographically-prepared to reveal the dominant sub-surface damage types and change in damage severity as a fu…
Abstract A scalable and solvent‐free chemical process to obtain highly functionalized and dispersible multi‐walled carbon nanotubes is reported. Highly functionalized multi‐walled carbon nanotubes have been prepared using in situ generated aryl diazonium salts in the presence of ammonium persulfate and 2,2′‐azoisobuty…
Powder compressed cores can overcome poor workability of Fe–6.5%Si alloys. In this study, effects of annealing temperature on the losses of Fe–6.5%Si powder compressed cores were investigated. The hysteresis loss was two to three times larger than the eddy current loss. With the increasing annealing temperature, the h…
Abstract Anionic polymerization was used to prepare silane‐endfunctionalized polybutadiene macromonomers with different molecular weights ranging from 9 000 to 34 000 g · mol −1 . These were polymerized by a hydrosilylation reaction in bulk to obtain branched polymers, using Karstedt's catalyst. Surprisingly, the addi…
We present a theoretical study of the energetic and thermodynamic stability of selected phosphorus and arsenic clusters containing 18 to 168 atoms. For this purpose we employ MP2 as well as DFT functionals BP86 and B3LYP with extended basis sets. All procedures predict the family of one-dimensional polymers X18+12n, e…
Over the past several decades the Army has been interested in transparent (visible and infrared wavelengths) armor ceramics where lightweight protection with minimal optical distortion is needed. These armor applications range from vision blocks for tanks to face shields for the individual soldier. In recent years, si…
Tensile fatigue tests were carried out at 77 K for YBCO-coated conductors fabricated by metal–organic chemical vapor deposition (MOCVD). The S – N relationship, variation of critical current ( I c ) during cyclic loading and microscopic fatigue damage were investigated. Fatigue strength at 10 6 cycles was evaluated to…
Abstract This study reports a reactive extrusion process leading to very high levels of anhydride grafting (2.5–3 wt %) along polypropylene backbone without recovering grafted PP waxes at the die exit. Such high graftings are attainable without excessive degradation of the PP chain by using a brominated reagent. Simul…
Recent experiments show that external inplanar electric field can be employed to guide the molecular self-assembly in diblock copolymer (BCP) thin films to form lamellar nanostructures with potential applications in nanotechnology. We study this self-assembly process through a detailed coarse-grained phase-separation…
Lanthanum phosphate (LaPO4) is considered as a potential material for thermal insulation coating on Ni-based superalloys owing to its high-temperature stability, its high thermal expansion and low thermal conductivity (i.e., comparable to properties of dense zirconia). in addition, lanthanum phosphate is expected to h…
We present an ab initio study of the structural and electronic properties of the halogen-bridged MMX single polymer [Pt2(CH3CS2)4I]n and of various possible modifications of its sequence, in the framework of density functional theory. The computed band structure of the infinite regular polymer reveals a net metallic c…
A newly developed alumina-based ceramic coating consisting of La2O3 Al2O3 and MgO that possesses long term structural and thermochemical stability up to 1400°C is presented. This coating composition ages significantly slower than commercial zirconia based TBCs at these high temperatures. This is achieved through the f…
Abstract We utilized bulk‐synthesized nanowires (NWs) of germanium dioxide as nanoscale structures that can be coated with noble metals to allow the excitation of surface plasmons over a broad frequency range. The NWs were synthesized on substrates of silicon using gold‐catalyst‐assisted vapor–liquid–solid (VLS) growt…