Materials Literature
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The usual continuum theories are inadequate in predicting the mechanical behavior of solids in the presence of small defects and stress concentrators; it is well known that such continuum methods are unable to detect the change of the size of the inhomogeneities and defects. For these reasons various augmented continu…
Abstract Angle‐resolved XPS depth profiling is a useful method in surface and ultrathin film research. However, it is useful to test various modeled structures in order to get information on its ability to recognize individual sublayers and to find its resolution limits. In this paper, a model consisting of ultrathin…
We report the influence of atomic disorder introduced by sequential neutron irradiation on the basic superconducting properties, flux pinning and grain connectivity. Two different polycrystalline Sm-1111 samples (SmFeAsO 1 − x F x ) and two Ba-122 single crystals (BaFe 1.8 Co 0.2 As 2 ) were investigated. The monotoni…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTCascade Chain-Walking Polymerization to Generate Large Dendritic NanoparticlesGuobin Sun and Zhibin Guan*View Author Information Department of Chemistry, University of California, 1102 Natural Sciences 2, Irvine, California 92697-20…
Abstract Due to zirconia and titania additions carbon‐free fine grained alumina ceramics are produced with superior thermal shock performance. The decomposition of Al 2 TiO 5 in the alumina doped matrix dominates during thermal shock attack and leads to higher strengths in comparison to the as sintered samples after t…
Understanding the conversion of coal-N during gasification is an important part of the development of gasification-based power generation technologies to reduce NO(x) emissions from coal utilization. This study investigated the conversion of coal-N in the presence of NO during the gasification of three rank-ordered co…
The coalescence of pairs of 2 mm air bubbles grown in a dilute electrolyte solution containing a lightly cross-linked 380 nm diameter PEGMA-stabilized poly(2-vinylpyridine) (P2VP) latex was monitored using a high-speed video camera. The air bubbles were highly stable at pH 10 when coated with this latex, although coal…
In an effort to enhance the thermoelectric performance in Si nanowires, we have explored the thermoelectric figure of merit ( ZT ) of the Ge/Si core−shell structured nanowires by using ab initio electronic structure calculations in the framework of Boltzmann transport theory. Our results show that the ZT value of the…
In order to prevent nuclear proliferation, the isotopic analysis of uranium and plutonium microparticles has strengthened the means in international safeguards for detecting undeclared nuclear activities. In order to ensure accuracy and precision in the analytical methodologies used, the instrumental techniques need t…
CeO2 nanoparticles were prepared by a simple co-precipitation method and the structural and magnetic properties were studied. X-ray diffraction, Raman and selected area electron diffraction results indicate that the samples have the cubic fluorite structure without other impurity phases. Magnetisation measurements ind…
Diffuse optical reflectance of Au/TiO 2 powder catalysts, prepared by the deposition−precipitation method, is measured in the UV−visible range in controlled atmosphere. An intense optical absorption observed around 550 nm is interpreted by the excitation of plasmon resonances in the 4 nm gold nanoparticles (NPs). The…
Specially elaborated technology for the preparation of active carbon has allowed us to obtain a series of samples with a highly developed Brunauer−Emmett−Teller (BET) surface of over 3000 m 2 /g, very high total pore volume of over 2 cm 3 /g, and high nitrogen content of up to 5.9 atomic %. Materials are characterized…
The surface of hydrogen-terminated diamond resembles a solid hydrocarbon substrate. Interestingly, the C-H bonds on the diamond surface are not as unreactive as that of saturated hydrocarbon molecules owing to its unique surface electronic properties. The invention of C-H bond activation and C-C coupling reactions on…
Reversible, fast, all-optical switching of the reflection of a cholesteric liquid crystal (CLC) is demonstrated in a formulation doped with push-pull azobenzene dyes. The reflection of the photosensitive CLC compositions is optically switched by exposure to 488 and 532 nm CW lasers as well as ns pulsed 532 nm irradiat…
Critical current density was studied by direct electrical transport measurements in single crystals of Ba(Fe 1 − x TM x ) 2 As 2 under magnetic fields up to 9 T. To understand the relation of the critical current to the structural transformations in the material, the electron doping level was controlled by the amount…
Past molecular dynamics (MD) studies of boron nitride nanotubes (BNNTs) have used van der Waals parameters from generic force fields, combined with various values for the partial charges on the boron and nitrogen atoms. This study explores the validity of these parameters by first using quantum chemical packages Car-P…
We report a numerical study on heat conduction in one-dimensional homogeneous lattices in both the linear and the nonlinear response regime, with a comparison among three prototypical nonlinear lattice models. In the nonlinear response regime, negative differential thermal resistance (NDTR) can occur in both the Frenk…
Abstract Low pressure setups (up to 150 psi) for creating hydrodynamic cavitation are investigated in this study. The decomposition of chloroform in water is used as a model reaction. The effects of upstream pressure, fluid velocity, Cavitation number, C v , and β 0 on the conversion are compared with regard to the ef…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTConfinement Effects on Chain Dynamics and Local Chain Order in Entangled Polymer MeltsSalim Ok, Martin Steinhart, Anca Şerbescu†, Cornelius Franz, Fabián Vaca Chávez‡, and Kay Saalwächter*View Author Information Institut für Chemie, Uni…
α-K x MnO 2 nanotubes with x = 0.10, 0.12, 0.15, and 0.17 have been synthesized through acid and alkali treatments of the precursor α-MnO 2 nanotubes. For the samples with x = 0.10 and 0.12, a large divergence of the ZFC and FC susceptibilities and pronounced hysteresis at low temperature are observed. However, the sa…