Materials Literature
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The Structural Classification of Proteins (SCOP) database is a comprehensive ordering of all proteins of known structure, according to their evolutionary and structural relationships. Protein domains in SCOP are hierarchically classified into families, superfamilies, folds and classes. The continual accumulation of se…
Electrospinning is a technique used to produce micron to submicron diameter polymeric fibers. The surface of electrospun fibers is important when considering end-use applications. For example, the ability to introduce porous surface features of a known size is required if nanoparticles need to be deposited on the surf…
Second- and third-harmonic generation in silicon carbide ( SiC ) nanopowders embedded in a polymethyl methacrylate ( PMMA ) film are studied using nano-, pico-, and femtosecond laser pulses. Second- and third-harmonic generation processes are shown to allow the detection of absorptive agglomerates of nanocrystals in t…
The nonlinear behaviors of the dielectric and piezoelectric responses of 〈001〉 oriented Pb(Zn1/3Nb2/3)O3-xPbTiO3 (PZN-PT) single crystals for x=4.5% and 8% have been investigated as a function of ac electric fields and dc bias fields. At relatively low applied fields, the polarization and strain of PZN-PT single cryst…
Se presenta una investigación Mössbauer detallada de magnetitas preparadas bajo diferentes condiciones hidrotermales y dopadas con Cu y Cr. Las muestras fueron caracterizadas utilizando la espectrometría Mössbauer a temperatura ambiente, espectroscopia infrarroja y difracción de rayos X. Los resultados Mössbauer muest…
We study the effect of magnetic scattering on transport in a system with strong structural disorder, using exact finite-size calculation of the low-frequency optical conductivity. At weak electron-spin coupling, spin disorder leads to a decrease in resistivity, by weakening the quantum interference precursors to Ander…
The catalytic oxidation of toluene on the Pt(111) surface has been characterized, in flowing oxygen pressures up to 0.01 Torr, using temperature-programmed fluorescence yield near-edge spectroscopy (TP-FYNES). During TP-FYNES oxidation experiments in flowing oxygen pressures, a dehydrogenated C 7 H 7 η 7 -phenylmethyl…
Metropolis Monte Carlo simulations are used to study the interplay between two different anchoring effects of spherocylinders on a modified surface consisting of hard walls onto which liquid-crystal molecules have been perpendicularly grafted. By varying both the length and grafting density of the surface molecules, a…
Crystallization in the microdomains of crystalline−amorphous diblock copolymers may induce domain coalescence when the crystallization temperature lies above the T g of the amorphous matrix. In this study, the perturbation of microdomain structure driven by isothermal crystallization and postannealing in a poly(ethyle…
GaTe samples of p-type have been investigated by analyzing the photoluminescence (PL) response for different excitation intensities at energies higher than the band gap. The PL intensity variation of recombination peaks as a function of the excitation intensity has been measured and fitted by a power law. The results…
Based on the magnetoresistance, magnetization, ultrasound, and crystallographic data, we studied the role of the cooperative Jahn–Teller (JT) effect in the charge-ordered (CO) state for La1−xCaxMnO3. We found that, with increasing the fraction of Q3 mode of JT distortion and decreasing that of Q2 mode in the CO state,…
There is an increasing interest in bioresorbable polymeric stents for coronary, urethral and tracheal applications. These stents can support body conduits during their healing process and release biologically active agents from an internal reservoir to the surrounding tissue. A removal operation is not needed. Bioreso…
Abstract A density functional study of exchange coupling in hydroxo‐ and alkoxo‐bridged dinuclear oxovanadium( IV ) compounds is presented. Coupling constants calculated for full unmodeled structures are in good agreement with experimentally reported values, confirming the ability of the computational strategy used in…
Author: Rosenfeldt, S. et al.; Genre: Journal Article; Issued: 2004; Keywords: dendrimers, small-angle neutron scattering, structure elucidation; Title: Analysis of the spatial dimensions of fully aromatic dendrimers
Electrical transport is studied in crystalline boron nanowires, using Ni and Ti as the contact electrodes, in which Ni forms ohmic contact and Ti forms Schottky-barrier junction. Three-terminal electrical measurements demonstrate p-type semiconductor behavior with estimated carrier mobility of 10−3 cm2/V s. The conduc…
La corrosión a alta temperatura, tal como la carburación de materiales expuestos a una amplia variedad de ambientes agresivos, tiene especial importancia desde el punto de vista técnico e industrial. Estos ambientes incluyen productos de combustión, gases e hidrocarburos con bajo potencial de oxígeno y alto potencial…
A four-electrode liquid crystal cell, featuring a double-side fringe-field switching, has been designed with two-layer electrodes on both glass substrates. The two-layer electrode is the same as that used in fringe-field switching liquid crystal displays. Using a negative dielectric liquid crystal, a homogeneous cell…
Photochemical and photophysical behavior of copper(II) phthalocyanine-3,4‘,4‘ ‘,4‘ ‘‘-tetrasulfonate anion Cu(tsPc) 4- irradiated with the visible light from the range 465−514 nm (vis) has been studied by resonance Raman spectroscopy. The photochemistry of monomers and dimers of Cu(tsPc) 4- has been studied in liquid…
Abstract By using an arylthiolate ligand with a substituent in the para ‐position, 4‐ t BuC 6 H 4 S − , the yellow silver‐thiolate complex {[HNEt 3 ] 2 n [Ag 8 Ag 4/2 (SC 6 H 4 t Bu‐4) 12 ] n · n C 2 H 5 OH} ( 1 ) has been synthesized and structurally characterized. Complex 1 is ionic composed of [HNEt 3 ] + cations a…
A super film: 2D sheet assemblies of alkylsilylated deoxyguanosine derivatives were formed by double intertape hydrogen bonding between hydrogen-bonded 1D tape motifs. Introduction of polar oxyethylene units at the sheet surface allowed the fabrication of a flexible, self-supporting supramolecular film (see figure) wi…