Materials Literature
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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…
Abstract This article reviews the noise absorption capacity of thermally bonded nonwovens in the range of audible frequencies (125–2500 Hz). First, we focus on the effects of the properties of the fibers, which constitute nonwovens, on the sound absorption properties, and then we consider the web orientation angle of…
The effects of hydrolysis temperature on the hydrolysis behavior and mechanism of poly(l-lactide) crystalline residues or extended-chain crystallites were investigated in phosphate-buffered solution (50-97 degrees C), using gel permeation chromatography and differential scanning calorimetry (DSC). The hydrolysis of th…
We have studied the electronic structure and charge-carrier dynamics of individual single-wall carbon nanotubes (SWNTs) and nanotube ropes using optical and electron-spectroscopic techniques. The electronic structure of semiconducting SWNTs in the band-gap region is analyzed using near-infrared absorption spectroscopy…
Highly delaminated poly(dicyclopentadiene)/clay nanocomposites were synthesized by in situ polymerization of dicyclopentadiene/organically modified montmorillonite clay dispersions. Dicyclopentadiene/clay suspensions were sonicated for various times to enhance the degree of delamination prior to curing. The d spacings…
In contrast to earlier theoretical studies and experimental expectation, full high-level (B3LYP/6-31G*) computations on various nanotube models reveal that SWCNTs with O, NH, CH2, and SiH2 addends favor opened structures rather than three-membered rings. Furthermore, the diagonal CC bonds in (8,0) zigzag nanotubes, r…
This paper reports a successful application of variable-temperature diffuse reflectance spectroscopy for the study of the solid-state thermo- and photochromism of salicylideneanilines, which belong to a class of the most well-known chromic organic compounds. This study disproves fundamental aspects that have been wide…
Particle anisotropy determines the way nanoparticles self-assemble, as shown in the picture. Gold and silver spheroids, rods, and plates with length-to-width ratios ranging from 1 to 25 show different liquid-crystalline order structures. These structures are analogous to the entropy-driven ordering that occurs at high…
Using molecular dynamics computer simulation, we have calculated the velocity autocorrelation function and diffusion constant for a variety of solutes in a dense fluid of spherical solvent particles. We explore the effects of surface roughness of the solute on the resulting hydrodynamic boundary condition as we natura…
Dying to be seen: A series of water-soluble and highly fluorescent perylenetetracarboxdiimides (PDIs) have been synthesized in high yields by introducing charged groups into the bay region of PDI (see picture; C gray, H white, S yellow, O red). They can be used for staining living cells as they are nontoxic.