Materials Literature
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The frequency‐dependent microwave complex permittivity of composites based on an Al 2 O 3 –CuO system is investigated at room temperature. The composites are formed by solution infusion of copper precursors into a porous Al 2 O 3 matrix, followed by thermal decomposition to copper oxides and localized formation of cop…
Natürlicher Helfer: PbE-Nanoröhren (E=S, Se, Te; siehe Bild) wurden mit einer neuartigen Biomolekül-unterstützten Methode bei Raumtemperatur erhalten. Die als Vorstufen fungierenden Nanodrähte, die sich aus in Gegenwart von Cystein synthetisierten Nanokristallen selbstorganisierten, spielen eine entscheidende Rolle al…
Calcium zirconate (CaZrO 3 , CZ) was prepared using a solid‐state reaction with mechanochemical activation through vibro‐milling, aiming at completing the reaction CaO+ZrO 2 =CaZrO 3 at relatively low calcination temperatures. Changes in the crystallite size and homogeneity of the mixed components CaO and ZrO 2 in the…
It has recently been hypothesized that transient bimodal grain size distributions can arise from unimodal distributions during coarsening if the continued growth of a majority fraction of the crystals is arrested by the energy barrier to nucleate new layers. To test this hypothesis experimentally, SrTiO 3 has been coa…
In this paper the multiwalled carbon nanotubes (MWNTs) were synthesized by a chemical vapour deposition and the SEM graph shows that the sample has good construction. The micro-Raman spectrum shows the characteristic line of the MWNTs and an additional line produced by the defects on the outer surface of MWNTs. The ph…
Family 4 carbohydrate esterases (CEs) catalyse the N- or O-deacetylation of substrates such as acetylated xylan, chitin, and peptidoglycan. CEs are classified into 14 families by sequence homology (see http://afmb.cnrs-mrs.fr/CAZY4). Family 4 is by far the largest of the CE families, with over 1000 open reading frames…
We address the existence and properties of hybrid surface waves forming at interfaces between left-handed materials and dielectric birefringent media. The existence conditions of such waves are found to be highly relaxed in comparison to Dyakonov waves existing in right-handed media. We show that left-handed materials…
Crystal growth of a model molecular crystal system, asparagine monohydrate (Asn·H 2 O), was explored in a variety of hydrogel media. Morphologies of crystals grown in agarose, carrageenan, and gelatin gels were compared with those of crystals grown from pure aqueous solutions, as well as those grown from solutions con…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTA New Strategy for the Preparation of Polyamide-6 Microspheres with Designed MorphologyAihua Pei, Andong Liu, Tingxiu Xie, and Guisheng YangView Author Information Beijing National Laboratory for Molecular Sciences, Key Laboratory o…
Mit Interferenzmikroskopie wurde die Konzentration von Gastmolekülen in Ferrierit-Zeolithen ermittelt. Die Mikroporen-Diffusionskoeffizienten wurden durch die mikroskopische Anwendung des zweiten Fickschen Gesetzes als eine Funktion der Beladung bestimmt. Mit Interferenzmikroskopie lassen sich isotrope und anisotrope…
Abstract The influence of relative humidity (RH) during the film preparation on the surface morphology and on the material distribution of the resulting technical polymer blend films consisting of poly (methyl methacrylate) (PMMA) and poly (vinyl butyral) (PVB) is investigated by atomic force microscopy. Both pure pol…
The spectral width, or $\ensuremath{\gamma}$ value, of the Raman excitation profile for single-wall carbon nanotubes is calculated by evaluating the lifetime of the carriers. The calculated results for the $\ensuremath{\gamma}$ values are compared with the experimental spectral width of the Raman excitation profile. T…
Structure, photoabsorption, and excited states of a covalently bonded porphyrin-fullerene dyad H(2)P-O34-C(60) are studied using DFT and TD-DFT approaches. Charge transfer from the donor (porphyrin) to the acceptor (fullerene) and the excited-state geometrical relaxation are of special interest. An analysis of differe…
The R ‐curve and stress–strain behaviors in a variety of ferroelastic polycrystalline ceramic compositions are investigated and compared. These include soft and hard compositions of Pb(Zr,Ti)O 3 , Na 0.5 Bi 4.5 Ti 4 O 15 , PbNb 2 O 6 , PbTiO 3 , and Pb(Mg 1/3 Nb 2/3 )O 3 –Pb(Zr,Ti)O 3 . The fracture toughness enhancem…
We present an EPR study of two Gd(III) complexes in aqueous solution at multiple temperatures and EPR frequencies. These two complexes, [Gd(TPATCN)] and [Gd(DOTAM)(H(2)O)](3+), display remarkably sharp lines (i.e. slow transverse electron spin relaxation) in comparison with all complexes studied in the past, especiall…
Interactions of succinic acid (SUC) with the {104} cleavage faces of calcite show a strong preference in crystallographic directions. In situ atomic force microscopy revealed that the morphology of etch pits on the crystal surfaces experienced a transition from the common rhombus to a hexagon upon the introduction of…
The effects of RuO(x) structure on the selective oxidation of methanol to methyl formate (MF) at low temperatures were examined on ZrO(2)-supported RuO(x) catalysts with a range of Ru surface densities (0.2-3.8 Ru/nm(2)). Their structure was characterized using complementary methods (X-ray diffraction, Raman and X-ray…
Theoretical calculations on undefected nanoscale materials predict impressive mechanical properties. In this review we summarize the status of experimental efforts to directly measure the fracture strengths of inorganic and carbon nanotubes and discuss possible explanations for the deviations between the predicted and…
Two series of WO(x)/TiO(2) catalysts, containing W surface densities up to 4.4 W atoms/nm(2), were prepared by pore volume impregnation of two different supports, titanium oxyhydroxide (amorphous) or titanium oxide (crystallized, 100% anatase). The influence of W surface density and the nature of the support on the su…
We have investigated the synthesis of lead‐magnesium‐niobate–lead‐titanate perovskite powder using high‐energy milling of the constituent oxides. The compositions of the crystalline and amorphous phases as a function of milling time were determined with X‐ray powder diffraction using a Rietveld refinement. The perovsk…