Materials Literature
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The crystal and magnetic structures of the manganites Pr 1− x Sr x MnO 3 ( x = 0.5, 0.56) have been studied by means of powder neutron diffraction at high external pressures up to 4.8 GPa. At ambient pressure both Pr 0.44 Sr 0.56 MnO 3 and Pr 0.5 Sr 0.5 MnO 3 have a tetragonal structure (space group I 4/ mcm ). At K i…
The crystal structure of the orthorhombic phase Al 4 (Cr,Fe) with a composition of Al 80.6 Cr 10.7 Fe 8.7 has been determined by single-crystal x-ray diffraction (table 2). There are 11 crystallographically independent Cr/Fe sites, of which 10 are icosahedrally coordinated. Of the 28 crystallographically independent A…
We describe molecule-by-molecule observations, using single molecule fluorescence spectroscopy, of the ordering of the components in a nematic phase formed by a binary mixture of short and long rods. A stiff conjugated polymer, MEH−PPV (poly[2-methoxy-5-((2-ethylhexyl)oxy)-1,4-phenylenevinylene]), present at very low…
A His-tagged derivative of the multidrug efflux pump AcrB could be crystallized in three different space groups (R3, R32 and P321). Experimental MAD-phasing maps from R32 AcrB(His) crystals were obtained to a resolution of 3.5 A. Datasets of native and substrate soaked AcrB(His) crystals were collected at the Swiss Li…
An ordered honeycomb structure of 4-dodecylbenzenesulfonic acid (DBSA)-doped polyaniline (PANI) is fabricated in a humid atmosphere. By controlling both the relative humidity in the atmosphere and the concentration of the conducting polymer, different morphologies of the honeycomb structure can be obtained. The drivin…
Electron pair emission from ferromagnetic crystalline surfaces, which occurs due to the collision of an incident low-energy electron with a valence electron, is shown to be governed by spatial and spin selection rules. Valence electron states with spatial parts antisymmetric with respect to the reaction plane are not…
A thin-layer synthesis technique was used to synthesize bulk amounts of the metastable phase, RuSb(3), a novel compound with the skutterudite structure. The compound crystallized at 350 degrees C and was stable to 525 degrees C. When annealed above 550 degrees C, it decomposed into RuSb(2) and Sb. Rietveld refinement…
The phase behavior of blends of mono-end-functionalized polymers (denoted by A) and a di-end-functionalized polymer (denoted by B), capable of forming triblocklike supramolecules, is theoretically predicted by using a weak-segregation theory based on the Landau formalism. In this model system, polymers can form dibloc…
Regenerative medicine requires scaffolds of divergent physicochemical properties for different tissue-engineering applications. To this end, a series of biodegradable poly(phosphoester) ionomers of the general composition [p(BHET-EOP-HOP/TC)] was synthesized, with BHET(bis-hydroxyl ethylene phosphate):EOP(ethylene pho…
6,8-Dibromo-(4H)-3,1-benzoxazinone 1a was synthesized and allowed to react with some nitrogen nucleophiles namely, hydroxylamine hydrochloride, 4-aminoacetophenone, ophenylenediamine, sulfanilamide, sulfamethoxazole, semicarbazide hydrochloride and ethanolamine to afford 3-substituted-4(3H)-quinazolinones 2-8, 10-12 a…
In this paper, we show that it is possible to direct the adhesion of polyelectrolyte microcapsules to patterned substrates. The patterned substrate contains regions of like and oppositely charged polyelectrolyte coatings: Adhesion of microcapsules is blocked by regions of the substrate containing like charges, while w…
Ordered hexagonal mesoporous silica material (JLU-30) has been successfully synthesized in alkaline media at high temperature (>160 °C), using cationic (1,3-dimethyl-2-imidazolidin-2-ylidene)hexadecylmethylammonium bromide (DIHAB) as a template, and characterized with X-ray diffraction (XRD), transmission electron mic…
Two fundamental manifestations of Al conduction electron response to Ar atom core hole in the final state of photoemission have been studied in implanted Ar bubbles in Al(111). Ar 2p binding energy and the Doniach-Sunjić asymmetry of the core-level line shape vary systematically as functions of Ar+ implantation energy…
Mixed ammonium molybdenum/tungsten bronzes are available in nanoscopic form via a straightforward solvothermal synthesis in acidic media. The emerging rods exhibit average lengths below 1 μm and diameters of 20−30 nm. They self-organize into manifold microscale patterns. The growth of mixed nanorods proceeds within a…
Structural, mechanical and elastic behaviour, density of states, electronic charge density and band structure of V B 2 and ZrB 2 are studied by the ab initio density functional method. The calculations carried out using the gradient-corrected approximation of the density functional theory are in excellent agreement wi…
New optically pumped lasing cholesteric polymers able to respond to pH changes in the chemical environment are synthesized and studied. The polymer may be prepared as a free-standing film, with lasing turned on and off in basic and acidic aqueous solutions.
The first-order magnetostructural phase transition in ${\mathrm{Gd}}_{5}({\mathrm{Si}}_{x}{\mathrm{Ge}}_{1\ensuremath{-}x}{)}_{4}$ alloys with $x<~0.5$ and the related entropy change $\ensuremath{\Delta}S$ are analyzed from high-field magnetization curves up to 23 T, and differential scanning calorimetry up to 5 T.…
We present a resonant x-ray scattering study at the manganese K edge on ${\mathrm{La}}_{7/8}{\mathrm{Sr}}_{1/8}{\mathrm{MnO}}_{3}$ at temperatures between 10 K and 310 K along with thermal expansion, magnetization, and electrical resistivity measurements. At the Mn K edge the symmetry-forbidden (300) reflection is obs…
Long fibers of high purity single-walled carbon nanotubes (SWNTs) were directly synthesized macroscopically by the modified arc discharge method. The purity of SWNT in fibers that can be obtained, as high as 80% (volume), was evaluated by scanning electron microscopy, thermogravimetric analysis, and Raman spectroscopy…
Two two-dimensional azido-bridged Mn(II) coordination polymers with bidentate coligands have been synthesized and structurally characterized, and their magnetic properties were studied. The complexes are of formula [Mn(bphz)(N 3 ) 2 ] n ( 1 ) and [Mn(mipc)(N 3 ) 2 ] n ( 2 ), where bphz = 2-benzoylpyridine hydrazone an…