Materials Literature
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This paper describes the investigation results of semiconducting glaze porcelain and silicone rubber polymer insulators removed from the transmission line under a heavy contaminated condition, the suburbs of Tianjin in China for 5 years in order to evaluate the long-term reliability of these insulators. Specimen insul…
The atomic and electronic structures of IV-VI semiconductor clusters ${\mathrm{Ge}}_{n}{\mathrm{Te}}_{m}(n+m<~10)$ are investigated using a real-space higher-order finite-difference ab initio pseudopotential method. Langevin molecular dynamics coupled to a simulated annealing procedure allows us to find the geometr…
A theoretical investigation is made of the plasmon propagation in the coaxial cylindrical geometries using Green function (or response function) theory in the absence of an applied magnetic field. The plasmon excitations in such multiple interface structures are characterized by the electromagnetic (EM) fields that ar…
Ionic residues influence the stability of collagen triple helices and play a relevant role in the spontaneous aggregation of fibrillar collagens. Collagen types I and II and some of their CNBr peptides were chemically modified in mild conditions with two different protocols. Primary amino groups of Lys and Hyl were N-…
Abstract The melting behavior of polyglycolide (PGA) with eight other biodegradable polymers was investigated to determine whether forming a blend could be used as a method of lowering the melting point of PGA. Blends were prepared by melt processing in differential scanning calorimetry (DSC) pans and were then analyz…
Carbon nanostripes of graphene structure prepared on the stepped Ni(771) surface have been studied by angle-resolved photoemission. The electronic structure is anisotropic: parallel to the stripe direction, a graphite-type dispersion is measured, whereas the perpendicular direction displays two entangled band structur…
Images of typical cationic flocculants of high molecular weight, poly[2-(acryloyloxy)ethyl(trimethyl)ammonium chloride] (PATC), adsorbed on mica surface in situ in water were observed by tapping-mode atomic force microscopy (AFM) under various conditions. The corresponding interaction forces between surfaces were meas…
We report observations of unusual and complex structures recorded on the surface of azo-dye-doped elastomer thin films after irradiation with different interference light patterns. Periodic structures with a variety of topography are inscribed through holographic recording by both intensity light patterns and polariza…
A detailed investigation of the characteristic current-voltage (I-V) curve and electronic switching effect in chalcogenide-based phase-change memory devices is presented. An original bandgap model of both crystalline and amorphous chalcogenide and a physical picture of the fundamental effects involved in device operat…
[reaction: see text] The dicorannulenobarrelene 1 was synthesized with the final step achieved by a nickel-mediated fourfold intramolecular coupling of dibromomethyl with bromomethyl groups. Low-temperature (1)H NMR spectra of 1 show a presence of three conformers with approximate populations of 0.82:0.13:0.05, in goo…
The 57 Fe Mössbauer quadrupole splittings (Δ E Q ) and isomer shifts (δ Fe ) in 3-coordinate high-spin Fe(II) complexes are unusually small, and previous attempts to reproduce their Δ E Q values have been unsuccessful. We show here that, by using large structural models and basis sets, both Δ E Q and δ Fe values can b…
All homogeneous sphere packings and all interpenetrating sphere packings have been derived that refer to the seven invariant and the 23 univariant lattice complexes belonging to the hexagonal crystal family. The respective sphere packings may be assigned to 66 types. In addition, one case of interpenetrating sphere pa…
Abstract Sisal fibers were benzylated under different conditions and were characterized with infrared spectroscopy, X‐ray diffraction, thermal analysis, and scanning electron microscopy. The benzylation reaction was monitored by the mass gain as a function of the reaction time. In the first stage, there was a mass los…
Structures and energetics of several types of all-carbon peapods made by C 60 s encapsulated inside single-wall carbon nanotubes are calculated. The interactions between the tubes and the molecules determine a minimal diameter for exothermic encapsulation of 11.74 Å and a radial deformation of the C 60 cage that is a…
The interaction of double hydrophilic block copolymers with calcite crystals is studied by isothermal titration calorimetry. These polymers are known to possess high activity as crystal growth modifiers for inorganic substances. Different titration protocols are used in order to decompose the total heat flow into seve…
We investigate the nonlinear rheological behavior of colloidal suspensions of Laponite, a synthetic clay, driven by a steady and homogeneous shear strain. We show that the external drive leads to a drastic slowing down of the aging dynamics or even, in some cases, in the rejuvenation of the system. Under shear, after…
This paper presents a metal-insulator-metal capacitor for SoC applications which has the highest capacitance density (up to 12 fF//spl mu/m/sup 2/) ever reported for a device in this field. The simple MIM structure allowed development of the process as a single-mask add-on to conventional Cu BEOL processing.
Abstract Everyday life encounters many materials in transition from liquid to solid, examples are preparing Jello® gelatin or mixing Epoxy glue. This fascinating phenomenon is called gelation and it is caused by the formation of crosslinks between polymer chains. In the above examples, these crosslinks are induced eit…
Abstract When the crosslinking reactions of Chapter 6 are driven far beyond the gel point, nearly all species are attached to the gel in a single macroscopic network polymer. Such networks, with either chemical or strong physical bonds, are important soft solids. If the glass transition and melting temperatures are be…
We use a finite-difference algorithm to simulate the shear flow of nematic liquid crystals based on the Leslie–Ericksen theory, and investigate how unequal elastic constants affect the formation, oscillation, and breakup of roll cells, the nucleation of defects, and the coarsening of texture upon cessation of flow. Wi…