Materials Literature
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A small amount of silicon incorporation into diamond-like carbon (DLC) films prepared by plasma-enhanced chemical vapour deposition (PECVD) onto Al 2 O 3 :TiC substrates was studied by a combination of surface analysis and nanomechanical measurement techniques, namely XPS, Raman spectroscopy, nanoindentation and nanos…
Improvements in the characterization of II-VI compound-based solar cells, and the recent experimental characterization of small clusters and nanoparticles, make the study of small II-VI clusters very interesting. In this work, the ground states of small ${\mathrm{Zn}}_{i}{\mathrm{O}}_{i}$ clusters are studied, where $…
A family of Mannich bases were prepared from the reaction of 2,2-bis-(4-hydroxyphenyl)propane (bisphenol A or BPA), formaldehyde, and poly(oxyalkylene)diamines at 1 : 1 : 1 or 1 : 2 : 2 molar ratio. By varying the molar ratio of bisphenol A to amine and the chemical structures of poly(oxyalkylene)diamines, a series of…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
The influence of temperature from 298 K to 353 K on the electrical conduction of low-density polyethylene is reported. Conduction current and differential scanning calorimetry (DSC) measurements show a correlation between the structural change due to the temperature treatment and the change in the activation energy of…
The effects of process conditions and molecular structure of polymer and diluent on the droplet size of membranes formed by thermally induced phase separatiom (TIPS) process were examined. The observed upper critical solution temperature–type phase boundaries of nylon-12 blended with poly(ethylene glycol) (PEG) and ny…
Shape memory thermoplastic polyurethanes (TPUs), based on amorphous soft segment from the reaction of hexamethylene diisocyanate and 1,2-butane diol, and the crystalline hard segment from 4,4′-methylenediphenyl diisocyanate and 1,6-hexanediol, were modified by hydrophilic segments, diol-terminated poly(ethylene oxide)…
Using the embedded-atom method, the structure of small copper clusters on Au(111) electrodes has been investigated both by static and dynamic calculations. By varying the size of roughly circular clusters, the edge energy per atom is obtained; it agrees quite well with estimates based on experimental results. Small th…
Crack-free antiferroelectric PbZrO3(PZ) thin films were prepared by a two-step annealing technique via a modified sol-gel process. Although x-ray diffraction results showed that single phase of perovskite PbZrO3 was obtained in the thin films annealed at 550, 700, and 550 °C/700 °C, double P-E hysteresis loop indicati…
Weit reichende Wechselwirkungen findet man bei einer neutralen, schichtartig aufgebauten Kupferverbindung, bei der die CuII-Ionen abwechselnd über End-on- und End-to-End-ständige Azide verbrückt sind (siehe Bild). Magnetische Messungen deuten auf ungewöhnliche ferromagnetische Wechselwirkungen zwischen den CuII-Ionen…
Die katalysierte Epoxidierung und Hydroxylierung von Kohlenwasserstoffen durch 30proz. H2O2 sowie die Bildung von Oxoeisen(IV)-Porphyrin-Intermediaten mit m-Chlorperbenzoesäure (m-CPBA) wird durch den anionischen axialen Ligandeneffekt des elektronenarmen Eisen(III)-Porphyrinkomplexes [Fe(tpfpp)X] markant beeinflusst…
Mindestens einige Tage beständig ist der lichtinduzierte metastabile High-Spin-Zustand eines Stark-Feld-FeII-Komplexes bei ≥20 K (siehe Schema). Die Lebensdauer dieses Zustands ist damit mehr als acht Größenordnungen länger als nach der Theorie des Inverse-Energy-Gap-Law erwartet.
Dreidimensionale Kanäle durchziehen ein Netz aus {[Dy4(OH)4(asp)3(H2O)8](ClO4)2⋅10 H2O}-Clustern (siehe Bild). Die Synthese gelang aus Dy(ClO4)3 und L-Asparaginsäure in wässriger Lösung bei pH 6.5. Diese Verbindung mit offener Gerüststruktur ist ein Beispiel für die Anordnung diskreter Lanthanoidcubane zu einem Superc…
This letter investigates the role of postdeposition oxygen treatments upon their luminescent properties by synthesizing Eu:Y2O3 films by pulsed laser deposition under different conditions and subjecting them to various postdeposition oxygen treatments. Our results have shown that Eu:Y2O3 films grown in 300 mTorr oxyge…
Rodlike amphiphilic molecules that contain exclusively aromatic building-blocks and no flexible alkyl chains have been synthesized and their mesomorphic properties investigated. These novel compounds bear diol head groups of different size (2,3-dihydroxypropyloxy or 5,6-dihydroxy-3-oxahexyloxy groups) at one end of a…
A microcavity composed of porous silicon multilayer mirrors was electrochemically etched and doped with erbium. Measurements of the reflectivity and photoluminescence spectra are presented. Thermal processing under a nitrogen atmosphere optically activated the erbium ions. Photopumping yielded room temperature emissio…
A butterfly structure and competing magnetic exchange interactions between the manganese(II) ions and organic, ruthenocene-substituted α-nitronyl nitroxide (NIT) radicals characterize the spin frustration system of a new dimeric MnII complex (see scheme, IMH=reduced form of the imino nitroxide).
A series of transition metal substituted polyfluorooxometalates (PFOM) [M(L)H2F6NaW17)55]q-, M= Zn2+ , Co2+, Mn2+, Fc2+, Ru2+, Ni2+ and V5+ and L=H2O, O2-, of quasi-Wells-Dawson structure, was synthesized. In the series prepared, only the nickel-substituted polyfluorooxometalate was capable of catalytic activation of…
That guest atoms donate electrons to framework atoms is a generally accepted concept. Nevertheless, evidence for the presence of neutral guest atoms in thermoelectric clathrate structures is presented in the form of experimental X-ray charge density analysis and X-ray absorption near-edge structure (XANES) data. The p…
Bei der Katalyse durch Dendrimere induzieren die katalysierenden Einheiten aufgrund ihrer räumlichen Nähe nützliche kooperative Effekte (siehe Bild). Kommerziell erhältliche Dendrimere wurden mit chiralen [Co(salen)]-Komplexen derivatisiert und wiesen bei der hydrolytischen kinetischen Enantiomerentrennung eine höhere…