Materials Literature
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Using thermoelectric compatibility, efficient thermoelectric generators are rationally designed. With examples, compatible and incompatible systems are explained and materials proposed for targeted development. The compatibility factor explains why segmentation of (AgSbTe2)0.15(GeTe)0.85 (TAGS) with SnTe or PbTe produ…
Water-soluble magnetite nanocrystals of different sizes have been prepared by a one-pot reaction through thermal decomposition of ferric triacetylacetonate in 2-pyrrolidone.
In this paper a novel synthetic route of pure MFe 2 O 4 (M = Mg, Co, and Ni) spinel ferrites is reported. The key feature of this method is using a single molecular precursor. The pure spinel ferrites can be obtained by calcination of tailored hydrotalcite-like layered double hydroxides (LDHs) of the type [M 1 - X - Y…
Boron nitride (BN) nanotubes have the same nanostructure as carbon nanotubes but are found to exhibit significant resistance to oxidation at high temperatures. Our systematic study has revealed that BN nanotubes are stable at 700 °C in air and that some thin nanotubes (diameter less than 20 nm) with perfect multiwalle…
The first example of ferromagnetism in a compound crystallizing with the filled beta-manganese structure is reported. Magnetometry and neutron diffraction show that Fe 1.5 Pd 0.5 Mo 3 N is ferromagnetic below 160 K, with a saturation magnetization of 2.44 μ B /formula unit which is associated with the Fe/Pd sublattice…
A wet-chemical deposition method of synthesizing highly oriented, transparent ZnO films on a crystalline template is described. Multi-nucleation and the subsequent growth of ZnO nanodomains at an early stage of wet-chemical deposition leads to the formation of thin hexagonal platelike ZnO crystals spread over the temp…
Microwave (MW) absorption by a thin ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}{\mathrm{MnO}}_{3}$ film on a ${\mathrm{SrTiO}}_{3}$ substrate is investigated at a 9.1 GHz as a function of a dc magnetic field. Features of this absorption, namely, the jump in the absorption derivative, have been detected as the applied fiel…
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…