Materials Literature
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Half-metallic ferromagnetic full-Heusler alloys containing Co and Mn, having the formula Co$_2$MnZ where Z a sp element, are among the most studied Heusler alloys due to their stable ferromagnetism and the high Curie temperatures which they present. Using state-of-the-art electronic structure calculations we show that…
Recent experiments showed that the robust charge ordering in manganites can be weakened by reducing the grain size down to nanoscale. Weak ferromagnetism was evidenced in both nanoparticles and nanowires of charge-ordered manganites. To explain these observations, a phenomenological model based on surface phase separa…
We explore an efficient way to numerically evaluate the response of the surface stress of a metal to changes in its superficial charge density by analysis of the strain-dependence of the work function of the uncharged surface. As an application we consider Au(111), (110) and (100) surfaces, employing density functiona…
Ca In 2 O 4 : x Eu 3 + (x=0.5%,1.0%,1.5%) phosphors were prepared by the Pechini sol-gel process [U.S. Patent No. 3,330,697 (1967)] and characterized by x-ray diffraction and photoluminescence and cathodoluminescence spectra as well as lifetimes. Under the excitation of 397nm ultraviolet light and low voltage electron…
High-quality cellulose multifilaments (see figure) are spun using a preliminary pilot apparatus, from the cellulose dope in an NaOH and urea aqueous solution precooled to –12 °C, by using a low-cost, simple, and environmentally friendly process. Small-angle X-ray scattering patterns indicate that the orientation of th…
The most widely distributed biosynthetic pathway to initiate phosphatidic acid formation in bacterial membrane phospholipid biosynthesis involves the conversion of acyl-acyl carrier protein to acylphosphate by PlsX and the transfer of the acyl group from acylphosphate to glycerol 3-phosphate by an integral membrane pr…
The polymorphic crystallization and melting behavior of poly(trimethylene 2,6-naphthalate) (PTN) have been investigated using small-angle X-ray scattering and simultaneous wide-angle X-ray scattering (WAXS) and differential scanning calorimetry (DSC). The α-crystal, the β-crystal and the coexistence of both crystal fo…
The synchrotron-based small-angle X-ray scattering (SAXS) technique was used to investigate the shear-induced crystallization kinetics of branched/unbranched poly(ethylene terephthalate) (PET). Reactive extrusion of bottle-grade PET with the branching and chain-extension agents pyromellitic dianhydride and pentaerythr…
A range of different stabilizers have been used to render natural kaolin clay particles hydrophobic and dispersible in nonpolar solvents such as heptane. Both silanol and aluminol groups are known to be present at the kaolin surface. Use of a Hammett indicator showed that silanes would not neutralize the acidic alumin…
Abstract Well-crystallized zinc oxide nanoscale tubular structures have been prepared by using the microwave irradiation method which does not need any templates, seeds, and surfactants. The ZnO nanotubes have regular polyhedral shapes, hollow cores with diameters of 100–200 nm, lengths of 1–3 μm and wall thicknesses…
Mg2Na2NiH6 was synthesized by reacting NaH and Mg2NiH4 at 310 degrees C under hydrogen pressure. The novel structure type was refined from neutron-diffraction data in the orthorhombic space group Pnma (No. 62), with unit cell dimensions of a = 11.428(2), b = 8.442(2), and c = 5.4165(9) Angstrom and a unit cell volume…
Hydrogenation of hexagonal Ce2Ni7 was investigated by synchrotron X-ray and neutron powder diffraction. In contrast to the recently investigated lanthanum analogue, which remains hexagonal (La2Ni7D6.5: space group P63/mmc), the cerium compound becomes orthorhombic (Ce2Ni7D approximately 4: space group Pmcn). As in the…
Abstract We have demonstrated for the first time a solvent-free synthesis of Zn–Al layered double hydroxides, Zn–Al LDH(Cl), by grinding solid ZnO and AlCl3·6H2O and then by autoclaving at 150 °C for 1 day without the addition of water and alkaline solution.
The electron paramagnetic resonance spin Hamiltonian parameters of mononuclear thiomolybdenyl complexes based upon the tris(pyrazolyl)borate ligand, together with their molybdenyl analogues, are calculated using density functional theory. The electronic g matrix and 95Mo hyperfine matrix are calculated as second-order…
Type III KGd(PO 3 ) 4 (KGP) and KNd(PO 3 ) 4 (KNP) inclusion-free single crystals can be grown using the top seeded solution growth−slow cooling method without pulling even though the viscosity of the solution is high (around 16 Pa·s -1 near the crystallization temperature). Poisoning by impurities in the crystals was…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTCrystallization-Induced Fluid Flow in Polymer Melts Undergoing SolidificationDonghua Xu, Zhigang Wang, and Jack F. DouglasView Author Information CAS Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Ma…
The sorption mechanism of Zn on gibbsite and mont-morillonite exchanged with Al3+ (Al-mont) or Keggin Al13 polymer (Al13-mont) was probed by powder and polarized EXAFS spectroscopy as a function of pH (5.85-7), reaction time (1-65 days), and sorbate to sorbent ratio (50-Zn is octahedrally coordinated to oxygens at app…
YycI and YycH are two membrane-anchored periplasmic proteins that regulate the essential Bacillus subtilis YycG histidine kinase through direct interaction. Here we present the crystal structure of YycI at a 2.9-A resolution. YycI forms a dimer, and remarkably the structure resembles that of the two C-terminal domains…
This work presents an analysis method for small-angle scattering data utilizing a simplified tube (hollow cylinder) form factor. The simplified form factor captures the rod-like character of a tube at long length scales (one-dimensional), the sheet-like character of the tube wall at intermediate length scales (two-dim…
This work reports the synthesis, characterization, and potential environmental applications of periodic mesoporous organosilicas (PMOs) having high surface area and large pore size as well as featuring framework and channel multifunctional groups. PMOs under study were obtained by direct co-condensation of tetraethyl…