Materials Literature
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It was an astonishing discovery that LaFeAs(O,F) (La1111) shows a high superconducting transition temperature TC of 26K. 1) The enhancement of TC by substituting lanthanoid elements was also amazing as well as the discovery of La-1111. TC comes up to 56K presently in Sm-1111, and it is a refreshing surprise that such…
Abstract The N‐succinylamino acid racemases (NSAAR) belong to the enolase superfamily and they are large homooctameric/hexameric species that require a divalent metal ion for activity. We describe the structure and stability of NSAAR from Geobacillus kaustophilus (GkNSAAR) in the absence and in the presence of Co 2+ b…
Nanostructured yttria‐stabilized zirconia powder (fully and partially stabilized) was densified using simultaneous applied current and pressure using varying displacement control rates for pressure application. The varying displacement rates were found to significantly affect densification rates as well as the final d…
Elastic properties of NaXH(4) (X = B, Al) have been studied by first-principles calculations using a projected augmented plane-wave approach. The calculated elastic constants compare favorably with experimental values. Our calculations show that the theoretically calculated elastic constants and bulk moduli have small…
Abstract Directly patterned mesoporous silicate films are prepared using positive‐ and negative‐tone strategies by performing phase selective silica condensation within lithographically exposed poly(styrene‐ b ‐ tert ‐butyl acrylate) (PS‐ b ‐PtbA) templates containing photoacid generators. The use of supercritical flu…
We study with $^{17}\text{O}$ NMR and bulk magnetization a lightly electron doped ${\text{CaMnO}}_{3\ensuremath{-}x}$ $(x<0.01)$ polycrystalline sample in the $G$-type antiferromagnetic state. The $^{17}\text{O}$ NMR spectra show two lines with very different intensities corresponding to oxygen sites with very diff…
Intermediate‐stage sintering of lanthanum strontium manganite (LSM, where Sr=0.00, 0.05, 0.10, 0.15, and 0.20) was shown in dilatometry studies to be accelerated when subjected to alternating flows of air and nitrogen. The extent of rate enhancement decreased with increased Sr content, and decreased with increased tem…
Abstract Luminescent Bi 2– x Nd x Se 3 nanoplates and nanoflowers were prepared by a hydrothermal co‐reduction method. XRD patterns indicate that the Bi 2– x Nd x Se 3 crystals with 0–10 mol‐% Nd 3+ are isostructural with Bi 2 Se 3 . Preferential nucleation and growth of the synthesised Bi 2– x Nd x Se 3 has been obse…
A translucent alumina composite containing 1 vol% LaAl 11 O 18 , prepared by the hot isostatic pressing (HIP) method, displays both high translucency and high fracture toughness. Its total forward transmission at 600 nm is 75% (thickness 1 mm), and its bending strength and fracture toughness are estimated to be 574±15…
The stacking of metal hydroxide layers is mediated by intercalated anions. Thereby, anions of different molecular symmetries select for different polytypes. The sulfate ion (molecular symmetry T d ) intercalates with one of its axes of rotation parallel to the c -crystallographic axis, also the stacking direction. Whe…
We have synthesized A-site ordered (AO)- and A-site disordered (AD)-Y1/4Sr3/4CoO3-delta (YSCO) with various oxygen deficiency delta, and have made a comparative study of the structural and physical properties. We have found that A-site (Y/Sr) ordering produces the unconventional oxygen-vacancy ordered (OO) structure,…
The continuum theory of sintering embodied in the constitutive description of Skorohod and Olevsky can be combined with results from mesostructure evolution simulations to model shrinkage and deformation of ceramics. An implementation (and variations) of this sintering model based on a finite element (FE) formulation…
Titanium dioxide represents a very important wide bandgap photocatalyst that is known to be sensitized to visible light by transition metal doping. Antimony doping has been demonstrated to provide photocatalytic activity when codoped with chromium at an optimum dopant ratio [Sb]/[Cr] of about 1.5. Here, the role of an…
ADVERTISEMENT RETURN TO ISSUEEditorialNEXTChemistry at the Nano−Bio InterfaceThomas E. Mallouk and Peidong YangCite this: J. Am. Chem. Soc. 2009, 131, 23, 7937–7939Publication Date (Web):June 10, 2009Publication History Published online10 June 2009Published inissue 17 June 2009https://doi.org/10.1021/ja9038104Copyrigh…
Piezoelectric lithium sulfate monohydrate, Li2SO4.H2O, was analyzed with respect to the relationship between the static structural properties of the crystal and its response to an external electric field. The static electron density was determined via standard low-temperature X-ray data collection at 90 (5) K using an…
Ceramics with the chemical compositions of Pb 1− x La 2 x /3 (Nb 0.95 Ti 0.0625 ) 2 O 6 (0≤ x ≤0.060) (PLTN) were prepared by the conventional solid‐state reaction method. X‐ray diffraction analysis indicated that Ti and La doping not only decreased the rhombohedral–tetragonal phase transformation temperature, but als…
Abstract Second‐, third‐, and fourth‐generation hyperbranched aliphatic polyols namely Boltorn® H20, Boltorn H30, and Boltorn H40 were endcapped with azido and activated acetylenic groups in good to excellent yields (75–95%) following an acid catalyzed procedure. The resultant terminally functionalized dendritic azido…
We discuss the origin of negative index behavior that is observed in certain artificial structures known as metamaterials that are periodic structures supportingbackwardoptical waves with generally antiparallel phase and group velocities. Slab-like metamaterials, metal-dielectric, and purely dielectric ones support su…
Mn ions were implanted into GaN thin films with six doses ranging from 1014 to 5 × 1016 cm−2 and the samples were subsequently annealed isochronically in three steps at 800, 850 and 900 °C. Structural, optical and magnetic properties of the implanted samples were studied after each annealing. X-ray diffraction measure…
Abstract We perform cell dynamics simulations to study the assembly of nanoparticles in diblock copolymer templates under electric fields. Our simulations predict that the nanoparticles directed by the diblock copolymer templates can assemble into various oriented structures, e.g., lamella, alternating lamella (for tw…