Materials Literature
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Abstract A new interesting category of organometallic polyketones and copolyketones was synthesized via Friedel–Crafts reactions through the polymerization of 2,7‐bis[(2‐ferrocenyl)methylene] cycloheptanone ( II ) with different diacid chlorides. The model compound was synthesized by reacting monomer II with benzoyl c…
Three heteroleptic tris(phathlocyaninato) dysprosium triple-decker complexes with different alkoxy groups at the peripheral positions of the medium phthalocyanine ligand (Pc)Dy[Pc(OCnH(2n+1))8]Dy(Pc) (n = 4, 8, 16) (I-III) {Pc = unsubstituted phthalocyaninate; Pc(OC4H9)8 = 2,3,9,10,16,17,23,24-octakis(butyloxy)phthalo…
13C high-resolution solid-state NMR coupled with selective 13C isotope-labeling of different Ala one methyl carbons was used to clarify the structure of (AG)15 peptide in the silk II structure as a model for the crystalline domain of Bombyx mori silk fiber. At the inner part of the peptide, the fraction of the peak at…
Soil carbonate‐C is a large pool of C and, in desert environments, is the dominant type of C stored in soil. To more fully understand the global C cycle and the role of soil in C sequestration, it is important to recognize how C enters and leaves the carbonate pool, as well as identify the forms of carbonate that exis…
The phase transition of 1:1 mixed-stack organic charge-transfer crystal of tetrathiafulvalene-$p$-bromanil (TTF-BA) has been investigated by high resolution x-ray diffraction. The temperature-induced phase transition to a nonmagnetic state at 53 K was characterized by a dimeric distortion of the donor-acceptor stack s…
In a multiphoton photoelectric process, an electron needs to absorb a given number of photons to escape the surface of a metal. It is shown for the first time that this number is not a constant depending only on the characteristics of the metal and light, but varies with the interaction duration in ultrashort time sca…
[reaction: see text] A family of dendritic amphiphiles were synthesized from the natural metabolites of glycerol, succinic acid, and myristic acid. The surfaces of these dendrimers display different numbers of alkyl chains and carboxylic acids, varying the hydrophobic-to-hydrophilic ratio over a relatively broad range…
Well-defined line patterns of zinc oxide (ZnO) were site-selectively grown on the photopatterned palladium (Pd) catalysts through an electroless deposition process under mild conditions. Pd catalysts in the form of nanoparticles were mainly positioned on the UV irradiated surface of polymethyl methacrylate (PMMA) film…
Abstract Six‐arm star‐shaped poly(ε‐caprolactone) (sPCL) was successfully synthesized via the ring‐opening polymerization of ε‐caprolactone with a commercial dipentaerythritol as the initiator and stannous octoate (SnOct 2 ) as the catalyst in bulk at 120 °C. The effects of the molar ratios of both the monomer to the…
The crystal structures of [Cu(bipy)(3)][BPh(4)](2), 1, and [Zn(bipy)(3)][BPh(4)](2), have been determined at low temperature. 1 and 2 are closely related, but are not isostructural. Both contain a two-dimensional supramolecular construct (SC) involving a sandwich structure. 1 has a six-coordinate CuN(6) chromophore wi…
Ferroelectric Pb0.35Sr0.65TiO3 (PSTO) thin films were grown on (001) MgO by using pulsed laser deposition. Microstructure studies from x-ray diffraction and electron microscopy indicate that the as-grown PSTO films have excellent single crystal quality and good epitaxial behavior with their c-axis oriented perpendicul…
Abstract Polyimide‐silica nanocomposites have been prepared from an aromatic polyamic acid derived from pyromellitic dianhydride and oxydianiline and a silica network using the sol‐gel reaction. Compatibilization of the two components was achieved by modifying the silica network with imide linkages. Morphology, therma…
Willemite nanoparticles doped with divalent cobalt ions were synthesized by a sol−gel method using propylene oxide as a gelation agent. The resulting nanoparticles show a narrow size distribution with particles in the 30−50 nm range. A highly homogeneous wet gel was achieved by the formation of M−O−Si bonds (M = Zn, C…
The root growth mode of extremely dense and vertically aligned single-walled carbon nanotubes (SWNTs) synthesized by microwave plasma chemical vapor deposition was clarified by a new method, marker growth, which does not require transmission electron microscopy. SWNT layers were grown intermittently on a substrate, an…
Self-assembly of an unsymmetrical bolaamphiphile produces either lipid nanotubes with cationic inner surfaces or nanotapes, depending on the initial molecular packing, which in turn depends on the solvent conditions. The nanotubes have different inner and outer surfaces, covered with amino and sugar functionalities, r…
Thermal strains and electromigration can cause voids to grow in conductor lines on semiconductor chips. This long-standing failure mode is exacerbated by the recent introduction of low-permittivity dielectrics. We describe a method to calculate the volume of a saturated void (VSV), attained in a steady state when each…
The structure and dielectric relaxation properties of (1−x)NaNbO3-xBiCrO3(0.1⩽x⩽0.5) composite ceramics with perovskite-pyrochlore biphase were studied. The coexistence of cubic perovskite and a cubic pyrochlore structure was characterized. A lack of mutual solubility between the two phases was observed. Biphase ceram…
Abstract α‐Tocopherol was compared with a commercial phenolic antioxidant (Irganox 1076) as a long‐term and process antioxidant in film‐blown and compression‐molded linear low‐density polyethylene. The antioxidant function of α‐tocopherol was high in the film‐blown material, especially in the processing, according to…
This paper presents the electricity and hydrogen co-production concept, a methodology for the study of SOFC hydrogen co-production, and simulation results that address the impact of reformer placement in the cycle on system performance. The methodology is based on detailed thermodynamic and electrochemical analyses of…
Abstract The structure and properties of a spunbond fabric are determined by numerous process variables. The development of fiber morphology is influenced and controlled by extrusion and quenching conditions. The properties of the fabric are the result of the properties of the filaments, their arrangement in the web,…