Materials Literature
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We investigate, using small-angle neutron scattering (SANS), the polymer concentration fluctuations in a particular type of end-linked polystyrene gels, in the swollen state. These gels are obtained from the cross-linking of well-defined end-capped low-polydispersity chains end-linked through a trifunctional cross-lin…
Silica monoliths with ordered arrays of micrometer-scale columns were fabricated from polyacrylamide gel templates. The preparation of the template involves the charged comonomer, N-acryloyl glycine, and is controlled by an externally applied electric field. This approach gives rise to the self-organization of columna…
Abstract The thermal degradation and flame retardancy of poly(butylene terephthalate) (PBT) were studied with a focus on the effect of phosphorous compounds. Thermogravimetric analysis, pyrolysis/gas chromatography/mass spectrometry (Py/GC/MS), and elemental analysis were used to analyze the flame retardancy, which we…
Aerogels with the nominal composition ZrW 2 O 8 have been prepared by pore solvent exchange with liquid CO 2 followed by supercritical drying. These aerogels are amorphous and can be tailored to have extremely high surface areas. Thermal expansion is measured for the amorphous aerogel as well as the aerogel post therm…
Rohr oder Röhrchen? Entgegen früheren theoretischen Untersuchungen ergaben Dichtefunktionalrechnungen (B3LYP/6-31G*) an unterschiedlichen Nanoröhrenmodellen, dass SWCNTs mit O-, NH-, CH2- und SiH2-Addenden offene Strukturen gegenüber Dreiringen bevorzugen. Ferner sind in (8,0)-Zickzack-Nanoröhren die diagonalen C-C-Bi…
The effects of intermolecular interaction on dipole moment (μ), the mean (α) and anisotropy (Δα) of the polarizability, and the first and second hyperpolarizabilities (β and γ, respectively) for four hydrogen bond dimers between two π-systems (HCN···HCN, HNC···HCN, HCN···HNC, and HNC···HNC) have been calculated in the…
The crystallization of calcite in the form of spheroaggregates in aqueous foam stabilized by the surfactant sodium bis-2-ethylhexyl-sulfosuccinate (aerosol OT, AOT) by a method of ion entrapment is described. Reaction of Na 2 CO 3 with Ca 2+ ions electrostatically entrapped in the foam results in the formation of flat…
Material probe analysis for plasma facing surface in the Large Helical Device, T. Hino, A. Sagara, Y. Nobuta, N. Inoue, Y. Hirohata, Y. Yamauchi, S. Masuzaki, N. Noda, H. Suzuki, A. Komori, N. Ohyabu, O. Motojima, LHD Experimental Group
Abstract Two new ketone‐type derivatives were synthesized by the dehydrodecarboxylation of levopimaric acid acrylic acid adduct and of levopimaric acid maleic anhydride adduct in the presence of sulfonic catalysts. The two compounds were also synthesized by coupling of acrylic acid or maleic anhydride with dipimaryl k…
Abstract A salicylic acid–guanadine–formaldehyde (SGF) tercopolymer was synthesized by the condensation of salicylic acid with guanidine carbonate and formaldehyde in 1 : 1 : 2 molar proportions in the presence of 2 M HCl as a catalyst. The SGF tercopolymer was characterized on the basis of elemental analysis and ultr…
The layered cerium iodates Ce 2 (IO 3 ) 6 (OH x ) [ x ≈ 0 ( 1 ) and 0.44 ( 2 )] have been prepared from the reaction of (NH 4 ) 2 Ce(NO 3 ) 6 with I 2 O 5 at 180 °C in aqueous media. The structure of these compounds consists of square antiprismatic Ce centers that are bound by bridging iodate anions and one bridging o…
Die Teilchenform bestimmt den Selbstorganisationsmodus von Nanopartikeln (siehe Bild). Kugeln, Stäbe und Scheiben von Gold und Silber mit Aspektverhältnissen von 1 bis 25 nehmen unterschiedliche flüssigkristalline Strukturen ein. Die Strukturbildung ist analog zur entropiegetriebenen Orientierung bei großvolumigen Fra…
A scheme of full self-heating compensation for the bolometer-based infrared (IR) sensors was proposed. Infrared-sensitive and infrared-insensitive bolometers with nearly identical self-heating characteristics were connected in parallel in a Wheatstone bridge to suppress the common mode. The time-dependent component of…
Abstract Different benzophenone‐type photoinitiators were photografted onto poly(propylene) (PP). The polymer surfaces were analyzed by means of contact angle measurements, UV spectroscopy, and FTIR‐ATR. The modified samples showed a better wettability and higher surface energies, increasing from 26 mN/m for pure PP t…
Es kommt Farbe ins Spiel: Wasserlösliche und hoch fluoreszente Perylentetracarboxdiimide (PDIs) wurden in hohen Ausbeuten durch Einführung geladener Gruppen in die Einbuchtung der PDI-Struktur erhalten (siehe Bild; C grau, H weiß, S gelb, O rot). Die Farbstoffe sind nichttoxisch und können daher zur Färbung lebender Z…
Die direkte selektive Gasphasenepoxidierung von Propen mit kommerziell tauglichen Umsätzen gelang mit Katalysatoren bestehend aus Gold-Nanopartikeln (3–5 nm) auf einem großporigen (>7 nm), silylierten mesoporösen Titanosilicat-Träger und Ba(NO3)2 als Promotor. Das Bild zeigt einen plausiblen Mechanismus für die synerg…
Humidity-dependent electrical conductivity, which suggests possible applications in sensors, is exhibited by OCF-6GaSe, an open-framework gallium selenide assembled from T3 (Ga10Se2010−) supertetrahedral clusters (picture, left). Furthermore, materials based on T4 (Zn4Ga16Se3514−, right), the largest supertetrahedral…
Biomimetic zeolite Beta macrostructures with hierarchical porosity were prepared by using a silica-containing vegetal template ( Equisetum arvense ). Leaves and stems of Equisetum arvense were subjected to hydrothermal treatment with a zeolite Beta precursor solution. The zeolite readily crystallized in the vegetal ti…
We report on the properties of a new air-stable nanowire material with the chemical formula Mo 6 S 3 I 6 . The distinguishing features of the material are rapid one-step synthesis, easy isolation and controllable dispersion into small-diameter wire bundles. Elemental analysis, x-ray diffraction, thermogravimetry, diff…
In this paper, we report on the synthesis and characterization of cobalt aggregates electrochemically incorporated on composite polypyrrole films. XAS (X-ray absorption spectroscopy) was used to probe the atomic local order in these composites and to furnish new insights into the metal/polymer interaction. A complete…