Materials Literature
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Thioborate materials have been considered for novel infrared nonlinear optical (NLO) materials having large optical nonlinear properties combined with favorable laser damage thresholds and wide transmission ranges from the visible to the mid-infrared regions. In this work, known and new thioborate materials have been…
The solubilities of 11α-hydroxy-16α,17α-epoxyprogesterone in methanol, ethanol, acetone, ethyl acetate, and acetic acid were measured using an isothermal method from 283 K to 323 K. A laser monitoring observation technique was used to determine the dissolution of the solid phase in a solid + liquid mixture. The solubi…
We report on a high-resolution electron diffraction study of the structure of individual multiwalled boron nitride nanotubes (MW-BNNTs). The tube chirality was determined by electron diffraction. Diffraction patterns were recorded from small sections of the nanotubes, ∼125nm long, using the nanoarea electron diffracti…
Abstract The reaction behavior and physical properties of polyurethane (PU)/clay nanocomposite systems were investigated. Organically modified clay was used as nanofillers to formulate the nanocomposites. Differential scanning calorimetry was used to study the reaction behavior of the PU/clay nanocomposite systems. Th…
Abstract Nanocomposites have been prepared by melt mixing poly(propylene) (PP) and different levels of a premixed montmorillonite‐organoclay masterbatch (PP/clay concentrate). Melt mixing was achieved using a Gelimat, a high‐speed thermokinetic mixer. The Gelimat system is designed to handle difficult compounding and…
Following the Kyoto protocol with respect to reducing emissions of greenhouse gases emissions, and EU energy policy and sustainability in waste management, there has been an increased interest in the reduction of emissions from waste disposal operations. From the point of view of nitrous oxide (N2O) emissions, waste i…
We investigate the relationship between microstructure and dielectric properties of textured SrTiO 3 thin films deposited by radio‐frequency magnetron sputtering on epitaxial Pt electrodes on sapphire substrates. The microstructures of Pt electrodes and SrTiO 3 films are studied by transmission electron microscopy, at…
Abstract In this paper we report the encapsulation of the compound 4′,7‐dihydroxyflavylium in a water‐permeable crosslinked poly(2‐hydroxyethyl methacrylate) matrix. The water permeability of the polymer and its transparency allow the use of pH and light stimuli to attain different states on the network defined by the…
Abstract Poly(ethylene terephthalate) (PET) waste flakes (blow‐molded‐grade industrial waste) were degraded with aqueous methylamine and ammonia at room temperature in the presence and absence of quaternary ammonium salt as a catalyst for various times. The catalyst reduced the time required for the degradation of the…
It is shown how stable, nonaqueous suspensions of fully exfoliated smectite clays such as Laponite and montmorillonite can be obtained. Suspensions in toluene and in a branched aliphatic solvent (polydecene) were characterized using elemental analysis, rheometry, and small-angle X-ray scattering. For Laponite, stable…
Abstract The first study of ion transport across self‐assembled multilayered films of p ‐sulfonato‐calix[ n ]arenes and poly(vinyl amine) (PVA) is presented. The films are prepared by the alternate electrostatic layer‐by‐layer assembly of the anionic calixarenes and cationic PVA on porous polyacrylonitrile (PAN) suppo…
An apparatus for measuring the conversion efficiency η and several further key properties of thermoelectric generators is presented. To achieve highest reliability and accuracy the crucial determination of the thermal energy that is supplied to the generator is done by an absolute method, i.e. by measuring the electri…
The collagen triple helix is characterized by the repeating sequence motif Gly-Xaa-Yaa, where Xaa and Yaa are typically proline and (2S,4R)-4-hydroxyproline (4(R)Hyp), respectively. Previous analyses have revealed that H-(Pro-4(R)Hyp-Gly)(10)-OH forms a stable triple helix, whereas H-(4(R)Hyp-Pro-Gly)(10)-OH does not.…
The role of the ferroxidase center in iron uptake and hydrogen peroxide detoxification was investigated in Listeria innocua Dps by substituting the iron ligands His31, His43, and Asp58 with glycine or alanine residues either individually or in combination. The X-ray crystal structures of the variants reveal only small…
Thin films of cellulose are advantageous for analytical studies in aqueous environments to investigate various factors determining the performance of cellulose-based products. However, the weak fixation of cellulose layers on common carrier materials often limits this approach. To address this problem, we suggest a no…
The structural stability of ${\mathrm{Na}}_{3}\mathrm{Al}{\mathrm{H}}_{6}$ and ${\mathrm{K}}_{3}\mathrm{Al}{\mathrm{H}}_{6}$ has been systematically investigated using accurate density-functional total-energy calculations. The experimentally known crystal structure of $\ensuremath{\alpha}\text{\ensuremath{-}}{\mathrm{…
Abstract Poly ( o ‐toluidine) (POT) salts doped with organic sulfonic acids (β‐naphthalene sulfonic acid, camphor sulfonic acid, and p ‐toluene sulfonic acid) were directly synthesized by using a new solid‐state polymerization method. The FTIR spectra, ultraviolet visibility (UV–vis) absorption spectra, and X‐ray diff…
Abstract An acrylic dispersed nanosized calcium carbonate filler was added to a prevulcanized latex compound in different amounts. The effect of filler content on the curing time, modulus, tensile strength, elongation at break (Eb) before and after ageing, and the morphology of the films was investigated. Results show…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTExfoliation of Organo-Clay in Telechelic Liquid Polybutadiene RubberTiehong Chen, Jianjun Zhu, Baohui Li, Shiyi Guo, Zhongyong Yuan, Pingchuan Sun, Datong Ding, and An-Chang ShiView Author Information State Key Laboratory of Functional Polymer Materials for Adsorption and Separ…
The direct synthesis of a mesostructured silica with a tridimensional mesopore network with micrometer-sized and -shaped particles control is reported for the first time. Micrometer-sized beads of the cubic silica mesostructure MCM-48 have been obtained through a MCM-41 pseudomorphic synthesis procedure using preforme…