Materials Literature
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Nanocomposite thin films (see Figure) that are prepared by sputtering and heat treatment demonstrate exchange coupling and remanence enhancement. A high remanence of J r = 1.31 T and a maximum energy product of ( B H ) max = 203 kJ m –3 are achieved. These multilayer films consist of magnetically hard Nd 2 Fe 14 B‐typ…
Exfoliation behavior of clay layers in epoxy−clay nanocomposites was studied with the electronegativities of aromatic diamine curing agents and curing temperatures. While faster gelation in the extragallery region accelerated by much more reactive aromatic diamine curing agents (1, 3-phenylendiamine (PDA) and 4, 4‘-me…
Abstract A fine‐tuning of the emission chromaticity from red to green is reported for organic–inorganic nanostructured hybrids co‐doped with Eu 3+ , Tb 3+ , and Tm 3+ . Raising the temperature from 200 to 300 K changes the color coordinates smoothly from the yellowish–green region of the chromaticity diagram towards t…
Abstract The water‐induced crystallization of alkylbenzenesulfonate‐coated amorphous calcium carbonate (ACC) nanoparticles in water‐in‐isooctane sodium bis(2‐ethylhexyl)sulfosuccinate (NaAOT) microemulsions at a [H 2 O]/[NaAOT] molar ratio ( w ) of 10:1 produces a range of organized hybrid surfactant–vaterite nanostru…
Arrays of bismuth telluride (Bi 2 Te 3 ) nanowires with diameters of ∼25, ∼50, and ∼75 nm have been produced by electrochemical deposition into porous anodic alumina templates. Scanning electron microscopy confirms that the nanowire arrays are dense with a narrow distribution of nanowire diameters. The structure of th…
A cyclic cylindrical 3d-4f tetranuclear structure, in which the 3d and 4f magnetic ions are arrayed alternately, has been found to be a suitable molecular design to produce a large magnetic moment and large magnetic anisotropy. Complexes 3-10 with the chemical formula [MLLn(hfac)2]2 ((MII, LnIII) = (Cu, Eu) (3), (Cu,…
The synthesis and characterization of several co-oligomers, 5,5‘-bis(4,4‘-dialkyl-2,2‘-bithiazol-5-yl)-(3,4,3‘,4‘-bis(ethylenedioxy)-2,2‘-dithienyl) (AT 2 A), 5,5‘-bis(3,4-ethylenedioxythien-2-yl)-4,4‘-dibutyl-2,2‘-bithiazole (TBT), and 5,5‘-bis(3,4,3‘,4‘-bis(ethylenedioxy)-2,2‘-dithien-5-yl)-4,4‘-dibutyl-2,2‘-bithiaz…
Abstract Although three forms of lithium phosphate are known, a complete structural description of the highest temperature polymorph has not yet been given. In the present work, the phase transitions of lithium phosphate were investigated at high temperatures using Raman microscopy and x‐ray powder diffraction. Both t…
Macroemulsions stabilized solely by nanoparticles of modified silica are used to prepare porous silica solid materials (see Figure), following slow evaporation of the two liquids. Both oil‐in‐water and water‐in‐oil emulsions can be employed, and the average pore size is close to the original emulsion drop diameter. Sp…
While LDA+U method is well established for strongly correlated materials with well localized orbitals, its application to weakly correlated metals is questionable. By extending the LDA Stoner approach onto LDA+U, we show that LDA+U enhances the Stoner factor, while reducing the density of states. Arguably the most imp…
Inorganic nanocrystals with well-defined shapes are important for understanding basic size-dependent scaling laws, and may be useful in a wide range of applications. Methods for controlling the shapes of inorganic nanocrystals are evolving rapidly. This paper will focus on how we currently control the shape of nanocry…
The electronic and energy properties of beta-Si3N4 (a), Si{6-x}AlxOxN{8-x} (b) and the hypothetical ordered solid solutions Si{6-x}MgxO{2x}N{8-2x} (c), Si{6-x}MgxOxN{8-2x}Sx (d), Si{6-x}MgxOxN{8-x} (e), Si{6-x}Mg{x/2}Al{x/2}OxN{8-x} (f) are considered by the ab-initio band FP-LMTO method. The calculations show that th…
We propose a microscopic method for modeling atomic ordering effects in multi-component solid solutions, which is based on minimizing the number of unfavorable interatomic bonds in the system. Atomic ordering effects are studied in the solid solutions Si{6-x}AlxOxN{8-x} (beta-SiAlONs) and hypothetical Si{6-x}BexO{2x}N…
In order to enhance spin injection efficiency from ferromagnetic (FM) metal into a two-dimensional electron gas (2DEG), we introduce another FM metal and two tunnel barriers (I) between them to investigate the current polarization in such ballistic FM/I/FM/I/2DEG junction. Our treatment is based on the free-electron s…
Magneto-optical spectroscopy of a transparent ferromagnetic semiconductor, anatase TiO2 doped with Co, is carried out at room temperature. A large magneto-optical response with ferromagnetic field dependence is observed throughout from ultraviolet to visible range and increases with increasing Co content or carrier co…
When a sinusoidal (ac) field is applied to a suspension containing nonlinear dielectric particles, the electrical response will generally consist of ac fields at frequencies of the higher-order harmonics. The situation is further complicated by an intrinsic dielectric dispersion which often occurs due to the surface c…
The chemical and structural nature of powders prepared from the zinc acetate-derived precursor using the sol−gel route is discussed. The influence of the synthesis temperature and of the hydrolytic catalyst on the structural features of the powder is focused on the basis of X-ray powder diffraction (XRPD) and extended…
Three‐dimensional photonic crystals are fabricated from block copolymers, forming a double gyroid network structure. Further processing produces three‐dimensionally nanoporous, freestanding materials (see Figure), and allows dielectric enhancement and infiltration, which dramatically improve optical and material prope…
Catalyst‐free metal–organic chemical vapor deposition (MOCVD) is used to prepare ZnO nanoneedles, grown vertically on Si substrates. Electron microscopy reveals that the nanoneedles are sharp, have uniform diameters, lengths, and densities, and high crystallinity. The photoluminescence spectrum displays a strong emiss…
The first results of electrospinning fibrinogen nanofibers for use as a tissue-engineering scaffold, wound dressing, or hemostatic bandage are reported. Structures composed of fibrinogen fibers with an average diameter of 80−700 nm were electrospun from solutions composed of human or bovine fibrinogen fraction I disso…