Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Abstract A research cooperation between USDA and the University of Pisa led to the development of several composite blends of poly(vinyl alcohol) (PVA) and lignocellulosic fibers. The cast films were prepared by blending orange fibers (OR‐fibers) and PVA with and without cornstarch to yield flexible and cohesive films…
We study the steady-state response to applied stress in a simple scalar model of sheared colloids. Our model is based on a schematic (F2) model of the glass transition, with a memory term that depends on both stress and shear rate. For suitable parameters, we find transitions from a fluid to a nonergodic, jammed state…
Abstract The hydroxyl end groups of poly(ethylene glycol) (PEG) have been transformed easily and quantitatively into amino groups via the Mitsunobu reaction. Phthalimide was alkylated with PEGs and the hydrazinolysis of the resulting phthalimido‐PEGs gave the amino compounds in high yields. Quaternization of the amino…
Pyruvate kinases (PK, EC 2.7.1.40) from three hyperthermophilic archaea (Archaeoglobus fulgidus strain 7324, Aeropyrum pernix, and Pyrobaculum aerophilum) and from the hyperthermophilic bacterium Thermotoga maritima were compared with respect to their thermophilic, kinetic, and regulatory properties. PKs from the arch…
Achieving clean surfaces is a major and challenging requirement for the study of surfaces and surface reactions. Nondestructive cleaning is a crucial step in semiconductor manufacturing, growth of materials, and processing. We use photoemission spectroscopy (PES) to systematically study the core and valence band elect…
Abstract In Part 1 of this contribution we have reported how the Flory‐Huggins interaction parameter χ can be modeled as a function of chain length within the composition range of pair interaction between the macromolecules by means of the three parameters α , ζ , and λ . This contribution presents the extension of th…
TiO2 is frequently used in optical coatings as an inexpensive material with a particularly high refractive index. Often this high refractive index is only achieved if the substrate is heated to enable the deposition of crystalline films with rutile structure. In this study titanium oxide films have been deposited by d…
Abstract A large number of outstanding physical properties observed in perovskite‐type oxides, such as giant piezoelectricity, colossal magneto‐resistance and high‐ T c superconductivity, are related to an intrinsic nano‐scaled local structure. For instance, the presence of a nano‐scaled structure is characteristic of…
Abstract The background of several electrochemical techniques – recording of the corrosion potential E corr , electrochemical impedance spectroscopy (EIS), electrochemical noise analysis (ENA) and recording of potentiodynamic polarization curves – has been discussed and examples of the use of these techniques in studi…
Shikimate dehydrogenase catalyzes the NADPH-dependent reversible reduction of 3-dehydroshikimate to shikimate. We report the first X-ray structure of shikimate dehydrogenase from Haemophilus influenzae to 2.4-A resolution and its complex with NADPH to 1.95-A resolution. The molecule contains two domains, a catalytic d…
International audience
The synthesis of magnesium silicon nitride (MgSiN 2 ) by direct nitridation of a Si/Mg 2 Si/Mg/Si 3 N 4 powder mixture is described. A nucleation period at 550°C and stepwise heat‐treatment schedule up to 1350°C was adopted for the synthesis of MgSiN 2 powder, based on TG‐DTA measurements. The influence of the ratio o…
We report high-precision reflectance, $R(\ensuremath{\omega}),$ measurements on films of conducting polypyrrole oriented by tensile drawing. The results obtained from Kramers-Kronig analysis of $R(\ensuremath{\omega})$ demonstrate that the optical conductivity, \ensuremath{\sigma}(\ensuremath{\omega}), becomes frequen…
This article summarizes two recently developed patterning techniques for plastic electronics: microcontact printing and thermal transfer printing. It reviews the methods and their capabilities, and presents new results on their use in forming transistors and circuits with a range of organic semiconductors. Active matr…
Experiments were conducted on the Zn-22 wt% Al eutectoid that contained nanometre-scale dispersion particles. These particles were introduced in the matrix of the alloy via powder metallurgy followed by cryomilling. Transmission electron microscopy observations made on specimens crept at a strain rate near the centre…
Recycling of rubber waste poses a challenging environmental, economical, and social problem. In the present study, we propose a new two-stage recycling process to reuse a rubber waste. First, the granulates of the waste were pulverized into small particles using a single screw extruder in the Solid State Shear Extrusi…
The ordering of Al 3+ , Fe 3+ , and Mg 2+ cations along the octahedral sheet in dioctahedral 2:1 phyllosilicates was studied theoretically. The distribution of Fe 3+ /Mg 2+ was studied in the octahedral sheet and is compared with the Al 3+ /Fe 3+ and Al 3+ /Mg 2+ distributions. The cation exchange interaction paramete…
Single‐phase in situ toughened SiAlON ceramics containing various modifying cations and single‐crystal seeds were studied. The modifying cations include rare‐earth cations from the smallest to the largest allowed in the α‐SiAlON structure (Yb to Y, to Nd), and from monovalent to trivalent (Li to Ca, to rare earths). A…
The influence of amide ligands on the photoluminescent behavior of tris(thenoyltrifluoroacetonate)- europium(III) in the solid state is reported. Elemental analysis showed that these compounds have the following formulas [Eu(TTA)3·(ANL)2] and [Eu(TTA)3·PZA], where ANL = acetanilide and PZA = pyrazinamide. The photolum…
This paper describes a modeling approach to incorporate the effects of nonquasistatic loading on the extensional behavior of an SMA wire. Experimental results under a variety of loading conditions indicate that the instantaneous temperature of the material is closely related to the applied strainrate in the material.…