Materials Literature
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The onset of water gelation around a collagen-like triple helix peptide was studied at ambient temperature and pressure by performing Molecular Dynamics simulations. The radial distribution functions of the oxygen and hydrogen atoms of water are distorted below 4 A from the peptide. The distortion is accompanied by th…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTNovel Synthesis of Poly(3-hydroxybutyrate)Maria Juzwa and Zbigniew JedliñskiView Author Information Centre of Polymer Chemistry, Polish Academy of Sciences, 34 Curie-Skłodowska Str., Zabrze, Poland Cite this: Macromolecules 2006, 39, 13, 4627–4630Publication Date (Web):June 2,…
With the plate‐impact technique, ductile spallation experiments are carried out on Ta at impact velocities 570, 1039 and 1078 m/s. Samples are soft‐recovered and analyzed by X‐Ray microtomography at the European Synchrotron Radiation Facility. The porosity along the shock direction, and the distribution of the pore vo…
Since 1991, Korea, Canada and United States have performed the direct use of spent pressurized water reactor (PWR) fuel in the Canada deuterium uranium (CANDU) reactors (DUPIC) fuel development project. Unlike the Tandem fuel cycle, which requires a wet reprocessing, the DUPIC fuel technology can directly refabricate…
A novel time-dependent percolation transition has been observed in sheared carbon nanotube (CNT) composites. At a fixed CNT filler loading, the electrical conductivities of CNT composites can change abruptly as much as 8 orders of magnitude as the shear processing time increases. Microstructure characterization shows…
Carbon nanowalls (CNWs) are synthesized under pure methane gas (CH 4 ) using helicon plasma-enhanced chemical vapor deposition. CH 4 in the helicon discharge is effectively dissociated to hydrogen atoms and hydrocarbon radicals, resulting in the formation of CNWs on a Ni substrate only from CH 4 . CNWs are grown up at…
Sodium germanate glasses are well-studied materials in which, unlike silicates but analogous to borates, the major structural consequence of alkali addition is generally thought to involve a coordination number increase of the network-forming Ge cations. However, the nature of this change, in particular quantifying fr…
Abstract The characterization of topsoils has recently received enhanced attention, particularly for environmental monitoring. Traditional national and international soil taxonomies hardly consider the topsoil in spite of its importance for soil quality. Consequently, the FAO “Topsoil Characterization for Sustainable…
Preyssler's anion, with formula [NaP5W30O110]14-, catalyzes the oxidation of aromatic aldehydes to related carboxylic acids by hydrogen peroxide as oxidizing agent, under microwave irradiation, or at 70 ºC. Both homogeneous and heterogeneous Preyssler's catalysts (as H14[NaP5W30O110 ]) were used and had their activity…
BACKGROUND: Fluorescent biosensors based on galactose/glucose binding protein (GGBP) and environmentally sensitive derivatives of the phenoxazine dye Nile Red are described. These biosensors are proposed as the sensing platform for a minimally invasive, continuous glucose monitoring system that can be implanted under…
Monodisperse, low molecular weight poly(2,5-di(2‘-ethylhexyloxy)-1,4-phenylenevinylene) (DEH-PPV) demonstrates significantly better structural order than polydisperse PPVs. Since optical and electrical properties of polymer electronics are closely related to the structure and morphology of the active layer, morphologi…
Abstract High‐performance top‐gate ZnO thin‐film transistors (TFTs) for AM‐LCDs have been developed. Sputtered ZnO was used as an active channel and silicon nitride (SiNx) deposited by plasma enhanced chemical vapor deposition (P‐CVD) was used as a gate insulator. Field effect mobility and threshold voltage of the ZnO…
Carbon dioxide (CO2) corrosion product scales of three kinds of oil well steel were obtained from simulated tests in autoclaves at varying temperatures and pressures. The effect of temperature and CO2 partial pressure on the thickness and grain size of the scales was studied with the help of scanning electron microsco…
A synopsis of already published results of very different characters, as obtained at four independent institutes, yields a congruent picture of the processes occurring during flow-induced crystallization of polymers like i-PP. The research groups mentioned only had a common starting point: They adopted the protocol of…
Fourier transform near-infrared (FT-NIR) Raman microspectroscopy was adopted for analyzing the micro mechanical tensile deformation behavior of cellulosic plant fibers. Mechanical strength parameters such as tensile strength, failure strain, and Young's modulus of diversified hemp fibers were determined within the ran…
Abstract In this Part II of the paper on the evolution of carbon-rich Si–O–C polymer-derived ceramics (PDCs), emphasis is placed on the strengths and limitations of transmission electron microscopy (TEM) techniques with high lateral resolution, i.e., electron energy-loss spectroscopy (EELS), high-resolution TEM (HRTEM…
Green rusts have been identified as corrosion products of steel in neutral or slightly alkaline aqueous media. They were mainly observed in carbonated media, where the carbonated green rust is obtained, and in seawater, where the sulphated variety is obtained. In the first case, the formation of the carbonated green r…
For the first time, it is shown that IR pyrolysis of a composite based on polyacrylonitrile and gadolinium chloride produces a metal-carbon nanocomposite where metal particles with a size of 4–11 nm form a fine dispersion in the structure of the carbon matrix. The carbon phase of the composite is a carbon-carbon nanoc…
Fe II –Fe III hydroxysalt green rusts (GR) are very reactive layered double hydroxides that can be characterised mainly by XRD and Mössbauer spectroscopy. Mössbauer spectra of the main compounds presented in this article are reviewed with special emphasis on those of GRs constituted of one or two ferrous doublets and…
The presence of “proteinaceous β-sheet rich fibrillar structures” and amyloidogenic material, has been alluded to extensively in the literature, in association with natural materials exhibiting superior mechanical strength per unit volume. Here we provide a clear experimental demonstration and explanation for why indi…