Materials Literature
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Ambipolar carrier transport properties in different phases of a liquid-crystalline photoconductor, 2-(4-octylphenyl)–6-n-butoxynaphthalene, were investigated by a time-of-flight technique. Carrier mobilities were increased stepwise when phase transition took place as the temperature decreased. The smectic E phase in t…
The electron field-emission properties of hydrogenated amorphous carbon and nitrogenated tetrahedral amorphous carbon thin films are examined by measuring the field-emission current as a function of the applied macroscopic electric field. The experimental results indicate the existence of an optimum film thickness for…
STM imaging of single-wall carbon nanotubes has recently been achieved with atomic resolution, revealing the chirality of the carbon network. In this work, a theoretical modeling of scanning tunneling microscopy of the nanotubes is presented, based on a tight-binding $\ensuremath{\pi}$-electron Hamiltonian. This theor…
Molecular simulations show that shear strains arising from liquid flow cause local minima of the potential-energy surface to disappear, leading to mechanical instabilities which force the system towards alternate local minima. Associated with these mechanical instabilities are irreversible atomic displacements, which…
We experiment with a massively parallel implementation of an algorithm for simulating the dynamics of metastable decay in kinetic Ising models. The parallel scheme is directly applicable to a wide range of stochastic cellular automata where the discrete events (updates) are Poisson arrivals. For high performance, we u…
Doped alkaline–bismuth–titanate perovskite single crystals have been grown in ferroelectric phases with high piezoelectric actuation. Rhombohedral-phase Na1/2Bi1/2TiO3–BaTiO3 crystals exhibit up to 0.25% free strain with low hysteresis along the cubic 〈001〉 direction (d33∼450 pC/N). Tetragonal phase crystals exhibit f…
To improve the transparency, flexibility, and solubility of polyimide, and to fabricate a negative working photoresist, polyamic acid, polyurea, and poly(amic acid-co-urea) in various contents were synthesized. Photosensitive diazoresin was synthesized and was used as the photocrosslinking agent. Characteristics of th…
The fibrillar and the lamellar structures in a range of poly(ethylene terephthalate) fibers were studied by small-angle X-ray scattering. The intensity maxima in the lamellar peaks lie on a curve that can be described as an ellipse. Therefore, the two-dimensional images were analyzed in elliptical coordinates. The dim…
A software program for experimental design and response surface methodology (RSM) was used to set up and evaluate the effect of modifiers in mixed polyolefin fractions. Sheet extruded blends of low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), 2 different high-density polyethylenes (HDPE) and 2…
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…