Materials Literature
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Pure aluminium containing about 200 at.ppm Fe in solution is shown to creep about 106 times slower at 200°C than the same aluminium containing a negligible amount of iron in solution. The high creep resistance of the Al–200 at.ppm Fe alloy is attributed to the presence of subgrain boundaries containing iron solute ato…
We present first-principles transport calculations for bismuth utilizing the linearized-augmented plane-wave method. From the calculated transport distribution, we compute transport coefficients and our results agree well with experiment. Furthermore, we derive the power factor and find two pronounced maxima excelling…
A novel Cu(II)-Mn(II) hexanuclear complex of formula [[MnCuL](3)(tma)](ClO(4))(3).8H(2)O [H(2)L = macrocyclic Robson proligand; H(3)tma = trimesic acid] has been obtained by connecting three heterobinuclear [Cu(II)Mn(II)L](2+) cationic species through the trimesate anion. The complex exhibits a C(3) rotational symmetr…
${\mathrm{Mn}}_{5}$ and ${\mathrm{Mn}}_{6}$ clusters have recently been found to exhibit Stern-Gerlach profiles marked by a central peak that broadens with the increasing field gradient. The profiles neither exhibit a reminiscence of space quantization as observed through a splitting of beams for the case of free atom…
Electron energy band alignment in GaAs(100)∕Ga2O3∕GdxGa0.4−xO0.6 structures was determined using internal photoemission and photoconductivity measurements. Two band gap values associated with Ga2O3(4.8eV) and Gd2O3(5.8eV) subnetworks were revealed. They yield potential barriers between the GaAs valence band and the bo…
We have investigated the behavior of single-walled carbon nanotubes and nanospheres (C(60)) under high hydrostatic pressure using Raman spectroscopy over the pressure range 0.2-10 GPa using a diamond anvil cell. Different liquid mixtures were used as pressure transmission fluids (PTF). Comparing the pressure dependenc…
We have developed a statistical model for the flashover of a $45\ifmmode^\circ\else\textdegree\fi{}$ vacuum-insulator interface (such as would be found in an accelerator) subject to a pulsed electric field. The model assumes that the initiation of a flashover plasma is a stochastic process, that the characteristic sta…
Abstract Summary: Poly( D , L ‐lactide) with a molar mass of 10 5 g · mol −1 and a yield over 90% was produced in 10 min by the ring‐opening polymerization of D , L ‐lactide under microwave irradiation with forward power of 255 W. A degradation of the poly( D , L ‐lactide) was also induced by microwaves with a power l…
Multiwall carbon nanotubes (MWNTs) were synthesized via the decomposition of CCl4 in supercritical CO2 at 175 degrees C and 27.6 MPa using an iron-encapsulated dendrimer as a growth catalyst. The average diameter of resultant nanotubes was 20-25 nm, obtained after a 24-h reaction time. Our conditions represent the fir…
Formylglycinamide ribonucleotide amidotransferase (FGAR-AT) catalyzes the ATP-dependent conversion of formylglycinamide ribonucleotide (FGAR) and glutamine to formylglycinamidine ribonucleotide (FGAM), ADP, P(i), and glutamate in the fourth step of the purine biosynthetic pathway. In eukaryotes and Gram-negative bacte…
UV illumination of semiconducting single wall carbon nanotubes (SWNTs) results in a substantial increase of the intensity of the first interband transition (S 11 ) followed by dark or IR light induced restoration of the initial intensity. The intensity of the S 11 transition could also be modulated by light-induced re…
The magnetic ordering in ${\mathrm{Mn}}_{2}\mathrm{O}\mathrm{B}{\mathrm{O}}_{3}$ has been determined from neutron diffraction and magnetization measurements. Long range antiferromagnetic order occurs below ${T}_{N}=26\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, other apparent magnetic transitions are due to secondary phase…
Catalytic formation of N(2)O via a (NO)(2) intermediate was studied employing density functional theory with generalized gradient approximations. Dimer formation was not favored on Pt(111), in agreement with previous reports. On Pt(211) a variety of dimer structures were studied, including trans-(NO)(2) and cis-(NO)(2…
The electrical conductance of 0.8∼5-µm-long multiwalled carbon nanotubes (MWCNT) was measured at room temperature in a multiprobe scanning tunneling microscope (STM)-scanning electron microscope (SEM) system and a conventional prober system, by bringing the MWCNTs into contact with patterned metal electrodes. The cont…
An etching technique called phase-change etching was developed. In this technique, only crystalline regions in a phase-change recording film are selectively etched by an alkaline solution, and amorphous regions remain on the sample surface, which means that a phase-change recording film can be used as a resist for pat…
The 4-(2'-pyridyl)-1,2,3,5-dithiadiazolyl neutral radical 1 has been prepared for use as a spin-bearing bidentate ligand. The coordination of this ligand to bis(hexafluoroacetylacetonato)cobalt affords a thermally stable complex 2. Magnetic susceptibility measurements of the crystalline complex indicate ferromagnetic…
Titanium-rich $\mathrm{PZT}$ solid solutions were studied under high pressure by neutron and x-ray diffraction, Raman spectroscopy and dielectric measurements. The results show that high pressure stabilizes the ferroelectric monoclinic phases, which are proposed to be responsible for the high piezoelectric properties…
The adsorption properties of NO molecule on anionic, cationic, and neutral Au(n) clusters (n=1-6) are studied using the density functional theory with the generalized gradient approximation, and with the hybrid functional. For anionic and cationic clusters, the charge transfer between the Au clusters and NO molecule a…
l -Aspartic acid ( l -Asp) has been intercalated into magnesium−aluminum layered double hydroxides by coprecipitation. The structure and composition of the intercalated material have been studied by X-ray diffraction, inductively coupled plasma emission spectroscopy, and elemental analysis. A schematic model of the in…
Uniform-sized mesoporous carbons having high surface areas and various structures were synthesized directly by the carbonization of P123 triblock copolymer/phenol−resin/silica nanocomposites, which were prepared from the sol−gel polymerization of silica in the presence of Pluronic P123 triblock copolymer and phenol an…