Materials Literature
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A model equation for the oscillation of a pressurized gas bubble in a nonlinear incompressible elastic medium [Emelianov et al., J. Acoust. Soc. Am. 115, 581 (2004)] is extended to include effects of surface tension, viscosity, weak compressibility, and confinement by an elastic shell. The significance of this work is…
We report the results of a systematic study of the structure–mesomorphic behaviour relationships of a diverse range of light‐emitting liquid crystals, but especially nematic 2,7‐disubstituted‐9,9‐dialkylfluorenes. The dependence of the mesomorphic behaviour and transition temperatures on the nature and length of the t…
Abstract A bis(bidentate) compartmental pyrazolate ligand HL with appended methylthiomethyl substituents in the 3‐ and 5‐positions of the heterocycle has been synthesized. It forms doubly pyrazolato bridged dicopper(II) complexes [L 2 Cu 2 ]X 2 (X = NO 3 − ( 3a ), ClO 4 − ( 3b )) with the metal ions in square planar {…
Natural rubber (NR)/clay/carbon black nanocomposites, filled with 10 phr, 20 phr, and 30 phr of filler (in total) were obtained by adding carbon black (N330) on a two-roll mill to NR/clay nano-compounds prepared by the emulsion compounding method. X-ray diffraction patterns and transmission electron microscope photogr…
The applicability of using flat composite plates and hollow core composite cylinders for moisture absorption testing of unidirectional glass/polymer composites used in high voltage composite (non-ceramic) insulators was examined. Two main issues were addressed in this work. First, the effect of specimen geometry (cyli…
We report a systematic study of the optoelectronic processes occurring in composites made of near-infrared (IR) emitting nanocrystals and conjugated polymers. We focus on PbSe and InAs∕ZnSe blended with polyphenylenevinylene-type polymers. We find that the process responsible for quenching the visible luminescence of…
Abstract Eighteen purified kaolin samples from Thai Ultisols were studied by X-ray diffraction, X-ray fluorescence, transmission electron microscopy and BET methods. Minor amounts of inhibited vermiculite, quartz and anatase were general contaminants of the kaolins which had an average chemical composition of 403 g kg…
ADVERTISEMENT RETURN TO ISSUEPREVNoteBlock Formation during Polymer CrystallizationThomas Hippler, Shichun Jiang, and Gert StroblView Author Information Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, 79104 Freiburg, Germany Cite this: Macromolecules 2005, 38, 22, 9396–9397Publication Date (Web):October…
Abstract Scarcely any other technology is of such a global interest due to economical and ecological reasons like automotive catalysis, and world wide efforts are exerted to improve and optimize automotive emission control systems enclosing new engine concepts, better fuel quality, and novel exhaust catalysts. Especia…
Extended X-ray absorption fine-structure (EXAFS) measurements were undertaken to understand the structural modification of amorphous Ge–Se films that occurs with the addition of Sb. We found that Ge–Ge bonds exist along with Ge–Se bonds in Ge-rich Ge–Se films. These bonds disappear with increasing Se content, to the e…
A three-dimensional computational fluid dynamics (CFD) model has been created to model hightemperature steam electrolysis in a planar solid oxide electrolysis cell (SOEC). The model represents a single cell as it would exist in an electrolysis stack. Details of the model geometry are specific to a stack that was fabri…
The polyanionic water-soluble and non-mu-oxo-dimer-forming iron porphyrin iron(III) 5(4),10(4),15(4),20(4)-tetra-tert-butyl-5(2),5(6),15(2),15(6)-tetrakis[2,2-bis(carboxylato)ethyl]-5,10,15,20-tetraphenylporphyrin, (P(8-))Fe(III) (1), was synthesized as an octasodium salt by applying well-established porphyrin and org…
A combination of colloidal crystal planarization, stabilization, and novel infiltration techniques is used to build a bimodal porous silica film showing order at both the micron and the nanometer length scale. An infiltration method based on the spin-coating of the mesophase precursor onto a three-dimensional polystyr…
Raman spectra of electrochemically charged single-wall carbon nanotubes (HiPco) were studied by five different laser photon energies between 1.56 and 1.92 eV. The bands of radial breathing modes (RBM) were assigned to defined chiralities by using the experimental Kataura plot. The particular (n,m) tubes exhibit differ…
Measurements of the electrical properties of high-resistivity zinc oxide (ZnO) are strongly influenced by the sample ambient. Temperature-dependent Hall-effect measurements were performed on Li- and Cu-doped bulk crystals in both air and vacuum. Repeating the measurements under a given test ambient produced stable res…
Multicomponent white cast irons contain many kinds of strong carbide forming elements in order to obtain a very hard microstructure characterized by the presence of different carbides that are well dispersed in a martensitic matrix. The heat treatment of these products consists in high temperature austenisation follow…
Life Cycle Assessment (LCA) is an environmental assessment method that has come into wide use. The LCA method has been used to assess the environmental impact of various products from domestic articles like plastic trays to large buildings. However, few LCA studies on domestic lumber have been conducted because of reg…
Unique diagnostic and access features of the DIII-D tokamak, including a sample exposure system, have been used to carry out controlled and well-diagnosed plasma-surface interactions (PSI) experiments. An important contribution of the experiments has been the ability to link a given plasma exposure condition to a meas…
Survey of desert dwellers in 102 villages in the Indian desert revealed many ethnomedicinal uses of commonly occurring Asclepiadaceous shrub called Milkweed, Calotropis procera (Ait.) R. Br. The information has been compared with 43 uses reported in previously published records and a total of 28 new medicinal uses hav…
The influence of order phenomena on the electrical and magnetic properties of a series of Fe-Si alloys is analyzed. Electrical resistivity and hysteresis loop measurements are performed on alloys after different thermal treatments, including annealing and quenching from several temperatures. Mo/spl uml/ssbauer spectro…