Materials Literature
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A novel approach for the synthesis of 5,5′-directly linked metal-free bis-porphyrins is reported; McMurry type coup-ling of dipyrroketones (e.g. 1) leads to 1,1,2,2-tetra(2-pyrrolyl)ethene 2, which after tetra-formylation (to give 3) and MacDonald macrocyclization with a 1,9-di-unsubstituted dihydrodipyrrin 4, affords…
Ferroresonance in electromagnetic voltage transformers, fed through circuit breaker grading capacitance, is studied using nonlinear dynamics methods. The magnetising characteristic of a typical 100 VA voltage transformer is represented by a single-valued two-term polynomial of the order seven. The system exhibits thre…
Electronic structure calculations of cubic ${\mathrm{SrTiO}}_{3}$ and ${\mathrm{SrHfO}}_{3}$ are presented. The full-potential linear augmented-plane-wave method is used and exchange-correlation effects are treated by the local-density approximation. The tendency to ferroelectricity of both compounds is explored and c…
The solid superacid-catalyzed depolymerization−liquefaction (DL) reactions of high-density polyethylene (HDPE), isotactic polypropylene (PPR), and cis -polybutadiene (PB) samples were systematically investigated as a function of processing conditions, i.e., temperature (350−450 °C), time (0.5−3.0 h), H 2 pressure (500…
The Diels–Alder reaction of β-sulfonylnitroethylene with cyclopentadiene, cyclohexadiene or substituted anthracenes followed by treatment with ethyl isocyanoacetate in the presence of DBU gives pyrroles fused with bicyclo[2.2.1]heptadiene and bicyclo[2.2.2]octadiene skeletons, or triptycene-types of pyrrole, respectiv…
A new type of three-dimensional open-framework copper chloride, prepared simply by the hydrothermal treatment of CuCl 2 ·H 2 O and en, is built up from unusual chloride bridged Cu 4 tetramers connected by CuCl 3/3 units and has voids in the framework that are filled with charge-compensating [Cu(en) 2 ] 2+ cations.
The biosynthesis of poly( l -alanylglycine) (poly(AG)) was performed in high cell density cultures of recombinant Escherichia coli . The purity of the material was determined by amino acid analysis, elemental analysis, and 1 H NMR spectroscopy. Fed batch fermentation increased the yield of recombinant protein from lev…
Extraordinary channel patterns have been observed in an oriented mesoporous silica film that is synthesized at the boundary between air and water. The basic channel designs comprise concentric circles, herringbones, fingerprints and hairpins. It is suggested that these patterns are spatio-temporal silicified recording…
The new ligand 4′-(4-anilino)-2,2′∶6′,2″-terpyridine (L 1 ) and a range of its transition-metal complexes have been prepared. The crystal and molecular structures of L 1 and [CuL 1 2 ][PF 6 ] 2 have been determined. Model reactions show that L 1 and its transition-metal complexes can be functionalised with suitable or…
An important and growing part of the textile industry consists of the medical and related healthcare and hygiene sectors. The extent of the growth is due to the constant improvements and innovations in both textile technology and medical procedures. The aim of this review is to highlight the specific medical and surgi…
The thermal conductivity of an AlN-and an alumina-particulate-filled epoxy resin was investigated as a function of their volume content ratios. AlN composite exhibited thermal conductivity of 7.15W/m·K at 68.5vol% filler content but that of alumina composite was lower than 2.68W/m·K even if the filler content was as m…
Fire fighters' protective clothing is designed to perform several functions. Of these, protection from heat and flame is one of the most important. Today's fire fighter protective clothing designs are based on years of field experience and research studies which addressed structural fires. Much of this work has concen…
Mesoporous zirconia is synthesized with anionic templates.
The synthesis of nanocrystalline zinc ferrite (ZnFe/sub 2/O/sub 4/) has been accomplished by a variety of chemical and mechanochemical techniques. An enhanced magnetization, 4-5 times that of bulk zinc ferrite, is observed for the nanoparticles regardless of the synthesis method. The hypothesis that the enhanced magne…
The likelihood of solving crystal structures from powder diffraction data is greatly enhanced if data collection and analysis strategies can be designed to effectively remove Bragg peak overlap. In this way, accurate normalised structure factors of essentially single-crystal quality are obtained. Such strategies are i…
Ambient temperature CO oxidation has been studied with Au/ZnO, Au/CuO and Au/CuO–ZnO catalysts prepared by a coprecipitation method. The catalysts are highly active for CO oxidation and are capable of sustained activity at 20°C. The highest activity is observed with Au/ZnO and this catalyst is shown, using transmissio…
Proton and lithium ion conducting polymer electrolytes, based on poly(vinyl alcohol)–H3PO4 and poly(ethylene oxide)–LiCF3SO3 plasticised with poly(ethylene glycol), have been used in the construction of electric double layer capacitors with both high density graphite sheet and activated carbon fabric electrodes. The p…
The dinuclear copper(II) complexes of formula [{Cu(Hdmg) 2 } 2 ] 1, [{Cu(Hbdmg)} 2 ][ClO 4 ] 2 2, [{Cu(Hdeg) 2 } 2 ] 3 and [{Cu(Hchd) 2 } 2 ] 4 (H 2 dmg, H 2 bdmg, H 2 deg and H 2 chd = dimethylglyoxime, 3,10-dimethyl-4,9-diazadodeca-3,9- diene-2,11-dione dioxime, diethylglyoxime and cyclohexane-1,2-dione dioxime) hav…
Subsolidus phase relationships in the Ga 2 O 3 –In 2 O 3 system were studied by X‐ray diffraction and electron probe microanalysis (EPMA) for the temperature range of 800°–1400°C. The solubility limit of In 2 O 3 in the β‐gallia structure decreases with increasing temperature from 44.1 ± 0.5 mol% at 1000°C to 41.4 ± 0…
A series of studies have been carried out on polyaniline (emeraldine base; EB) thin films deposited on glass substrates from aqueous solutions of polymerizing aniline (“in-situ” EB-I film). These films exhibit a Vis/UV spectrum in which the exciton peak has an absorption maximum at ~600 nm. Exposure of EB-I film to NM…