Materials Literature
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A possibility for an additional family of intermetallic perovskite superconductors ${\mathrm{Sc}}_{3}X\mathrm{B}$, with $X=\mathrm{Tl}$, In, Ga, and Al, is presented as a result of Korringa-Kohn-Rostoker (KKR) electronic structure and pseudopotential phonon calculations. The large values of computed McMillan-Hopfield…
A zirconia suspension containing 5–10 nm size zirconia particles was modified by adding different amounts of polymer solution to enable electrospinning of zirconia fibers from a range of compositions. The electrospun fibers were heat treated at 600° and 1200°C, and analysis of size distribution reveals that zirconia f…
The tetra-(8-hydroxyquinolinato) boron complex (Bq) and 3,3',4,4'-benzophenone tetracarboxylic anion (BPTC) were successfully intercalated into layered double hydroxides with an ion-exchange method. Elemental analyses, powder X-ray diffraction, FTIR spectra, and thermogravimetric analyses indicated that the hydrotherm…
GeSe 2 –Ga 2 Se 3 –CsI chalcohalide glasses are synthesized, and their optical properties and thermo‐mechanical properties are studied. A typical characteristic of the glasses is their excellent transparency in the red‐light region in addition to the 8–14 μm atmospheric window, which is of vital importance to the qual…
The resonant Raman intensity of the totally symmetric phonons of all single-walled carbon nanotubes in the radius range from $2.5\phantom{\rule{0.3em}{0ex}}\mathrm{\AA{}}\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}11.5\phantom{\rule{0.3em}{0ex}}\mathrm{\AA{}}$ was calculated within a symmetry-adapte…
Solid solutions of lithium and sodium metazirconates, Li 2 - x Na x ZrO 3 (0 ≤ x ≤ 2), were prepared by coprecipitation. Then, samples were characterized by powder X-ray diffraction, small-angle X-ray scattering, transmission electron microscopy, solid-state nuclear magnetic resonance, and N 2 adsorption (BET). Result…
Abstract Epoxy/polyhedral oligomeric silsesquioxane (POSS) nanocomposites were obtained from octakis(glycidyldimethylsiloxy)octasilsesquioxane (OG) and diglycidyl ether of bisphenol A cured with small‐molecule curing agents of diethylphosphite (DEP) and dicyandiamide (DICY). An increase in the POSS contents of the nan…
A constraint stress of 62.5 MPa is created on a three‐dimensional C/SiC composite specimen whose both ends are fixed when temperature is cycled between 900° and 1200°C. The cyclic stress results in a maximum damage strain of 0.06% within 50 cycles owing to coating and matrix cracking, fiber debonding, sliding, and bre…
Abstract Carbon nanotubes (CNTs) are a unique form of carbon filament/fiber in which the graphene walls roll up to form tubes. They can exhibit either metallic‐like or semiconductor‐like properties. With the graphene walls parallel to the filament axis, nanotubes (single wall metallic‐type or multi‐wall) exhibit high…
Extreme osmotic compression of nanoemulsion droplets, achieved by ultracentrifugation, can create solidlike biliquid foams without causing significant droplet coalescence. Using small-angle neutron scattering (SANS), we probe the structure of a uniform silicone oil-in-water nanoemulsion stabilized by sodium dodecyl su…
Abstract Poly(lactic acid) (PLA)/organoclay nanocomposites were prepared by melt compounding in a co‐rotating twin screw extruder. Two types of commercialized organoclay (dimethyl benzyl stearyl ammonium ion and dimethyl distearyl ammonium ion intercalated between clay platelets named as Clay A and Clay B, respectivel…
Von hoher Güte: Eine neue Klasse nanostrukturierter p-Typ-Thermoelektrika Na1−xPbmSbyTem+2 wird beschrieben. Die außergewöhnlich hohen thermoelektrischen Gütefaktoren ZT dieser Materialien (siehe Bild) ergeben sich aus ihren sehr niedrigen thermischen Gitterleitfähigkeiten und übertreffen die der heutigen Standardmate…
UreE is a homodimeric metallo-chaperone that assists the insertion of Ni(2+) ions in the active site of urease. The crystal structures of UreE from Bacillus pasteurii and Klebsiella aerogenes have been determined, but the details of the nickel-binding site were not elucidated due to solid-state effects that caused dis…
Debye-like screening by edge dislocations of some externally given stress is studied by means of a variational approach to coarse grained field theory. Explicitly given are the force field and the induced geometrically necessary dislocation (GND) distribution, in the special case of a single glide axis in 2D, for (i)…
Abstract Quenching of quantum dot luminescence by nitroxides shows steep exponential behavior and is dependent on nanoparticle size, being most effective for the smaller particles. The interaction of CdSe nanoparticles with TEMPO (non‐binding) and 4‐amino‐TEMPO (binding) has been examined using fluorescence and electr…
The ease and ability to predict sintering shrinkage and densification with the Skorohod–Olevsky viscous sintering (SOVS) model within a finite‐element (FE) code have been improved with the use of an Arrhenius‐type viscosity function. The need for a better viscosity function was identified by evaluating SOVS model pred…
A novel co‐precipitation process was adopted for the preparation of highly sinterable europium‐doped lutetia powders using ammonium hydroxide (NH 3 ·H 2 O) and ammonium hydrogen carbonate (NH 4 HCO 3 ) as the mixed precipitant. The resultant powders calcined at 1000°C for 2 h showed good dispersity and excellent sinte…
We report n2 measurements of selected chalcogenide glasses using a modified Z-scan technique. Measurements were made with picosecond pulses emitted by a 10 Hz Q-switched, mode-locked Nd:YAG laser at 1064 nm under conditions suitable to characterize ultrafast nonlinearities. The nonlinear index increases significantly…
Abstract We performed two different types of composites using single wall carbon nanotubes: 1) transparent electrodes, using a thin network of carbon nanotubes as electrode on which we can grow a conducting polymer electrochemically on it, polyaniline or polypirrole, CNT–CP; the obtained thin films are both transparen…
A structurally diverse array of polynuclear complexes has been identified and structurally characterized from the reaction of 6-methylpyridine-2-methanol (1) with a range of cobalt(II) salts under a variety of reaction conditions. A tetranuclear cubane, [Co4(1-H)4Cl4(H2O)3(CH3OH)], was isolated from the reaction of 1…