Materials Literature
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Various bismaleimide-diamine Michael addition type prepolymers were prepared through melt condensation and using acetone, dimethylformamide, and m-cresol as solvents in a molar ratio of 1 : 1. Structures of the prepolymers, such as terminal moieties and molecular weight of main chain, depended strongly on the preparat…
The combination of new containerless sample and high intensity synchrotron source technologies has enabled the X-ray diffraction pattern from a molten oxide (Al 2 O 3 ) to be determined for the first time (Ansell et al. Phys. Rev. Lett. 1997, 78, 464). 1 Here we show that the liquid-state diffraction pattern, predicte…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTShape-Selective Ligation to Dendrimer−MetalloporphyrinsP. Bhyrappa, G. Vaijayanthimala, and Kenneth S. SuslickView Author Information Department of Chemistry University of Illinois at Urbana-Champaign 601 South Goodwin Avenue, Urbana, Illinois 61801 Department of Chemi…
A pressurized thermobalance (TGA) system was built. The role of CO2 was studied in the controlled temperature combustion under pressurized conditions. Particular care was taken to employ low sample masses in thin layers, to avoid self-heating phenomena and ensure kinetic control. It was found that a CO2 partial pressu…
Direct intercalation of poly(vinylpyrroridone) (PVP) into the interlayer space of kaolinite at room temperature is achieved by a refined guest displacement method by utilizing both a kaolinite−methanol intercalation compound and PVP dissolved in methanol.
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTAssembly of a Zn(II)-Porphyrin−Bipyridinium Dyad and Au-Nanoparticle Superstructures on Conductive SurfacesMichal Lahav, Tobias Gabriel, Andrew N. Shipway, and Itamar WillnerView Author Information Institute of Chemistry and The Farkas Center for Light-Induced Processe…
Adsorption of hydrogen on graphitic nanofibers has been computed from Grand Canonical Monte Carlo simulations. The graphite platelet spacing has been optimized to maximize the weight fraction of hydrogen adsorbed. Comparison of experimental data of Rodriguez and co-workers (Chambers, A; Park, C.; Baker, R. T. K.; Rodr…
Nanocrystalline alumina was synthesized by using the sol−gel method with aluminum sec -butoxide as the precursor. FTIR, TG, XRD, and crystalline structure refinement were used to analyze the phase transformations and their crystalline structures. When samples were annealed at 200 °C, they had two nanocrystalline phase…
While silk exhibits high values of tensile strength and stiffness, these properties are compromised by their poor reproducibility. We present the results of experiments aimed at characterizing the variability of tensile properties exhibited by cocoon silk from Bombyx mori silkworms. Scanning electron microscopy is use…
A novel strategy for the enzymatic synthesis of a water-soluble, conducting polyaniline (PANI)/sulfonated polystyrene (SPS) complex is presented. The enzyme horseradish peroxidase (HRP) is used to polymerize aniline in the presence of a polyanionic template, sulfonated polystyrene. The synthesis is simple, and the con…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTMesocellular Siliceous Foams with Uniformly Sized Cells and WindowsPatrick Schmidt-Winkel, Wayne W. Lukens,, Dongyuan Zhao, Peidong Yang, Bradley F. Chmelka, and Galen D. StuckyView Author Information Department of Chemistry, Materials Research Laboratory and Departmen…
For the first time, new hybrid organic−inorganic materials containing ferri-ferrocyanide and having a well-defined multilayer architecture were successfully obtained using the Langmuir−Blodgett (LB) technique. These LB films present a ferromagnetic behavior below 5.7 K. In this temperature range, their magnetic proper…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis of ABA Type Thermoplastic Elastomers Based on PolyacrylatesS. K. Varshney, P. Kesani, N. Agarwal, J. X. Zhang, and M. RafailovichView Author Information Polymer Source, Inc., 771 Lajoie Street, Dorval, Quebec H9P 1G7, Cana…
Chromium oxide was supported on different commercial aluminas. Their characteristics were assessed by different techniques (X-ray diffraction, X-ray photoelectron, laser Raman, and electron paramagnetic resonance spectroscopies, and Brunauer−Emmett−Teller surface, temperature-programmed reduction, and temperature-prog…
Porous silica, niobia, and titania with three-dimensional structures patterned over multiple length scales were prepared by combining micromolding, polystyrene sphere templating, and cooperative assembly of inorganic sol-gel species with amphiphilic triblock copolymers. The resulting materials show hierarchical orderi…
Simple organic molecules can have many functions. The active ingredient in the corrosion inhibitor 3-(4-methylbenzoyl)propionate works because it addresses the metal sites of a surface through carboxylate groups, forms hydrogen bonds with surface hydroxide groups (see picture), and provides excellent surface coverage…
The changes of structure and electronic state of copper ion species during the heat treatment of copper ion-exchanged ZSM-5 zeolite (CuZSM-5) as well as the interaction with CO molecules have been investigated by using various spectroscopic techniques such as infrared (IR) and emission spectroscopy (ES), electron spin…
Removal of the C-terminal seven residues from phosphoglycerate mutase from Saccharomyces cerevisiae by limited proteolysis is associated with loss of mutase activity, but no change in phosphatase activity. The presence of the cofactor 2, 3-bisphosphoglycerate, or of the cofactor and substrate 3-phosphoglycerate togeth…
The hydrophilicity of polymers, as indicated by their swelling characteristics in water, is an important parameter with regard to their use as coatings which are able to modify the wettability and adhesive properties of a material. We have investigated the swelling behavior of a series of hydrophilic random copolymer…
An immensely broad scope of structural motifs is covered by the intriguing chemistry of boron–sulfur and boron–selenium compounds. Characteristic structural features of the binary boron sulfides can be applied to understand and rationalize the three-dimensional atomic arrangement in macromolecular anionic frameworks s…