Materials Literature
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We show by vibrational and photoemission spectroscopy and by ab initio calculations that in ultrahigh vacuum oxygen adsorption at stepped Ag surfaces causes the formation of surface oxide phases with different stoichiometry, depending on the morphology of the steps involved in the nucleation process. On Ag(511), chara…
Abstract In this article, the volume resistivity of polypropylene (PP)/chlorinated polypropylene (CPP)/polyaniline (PANI) composites was detected. The results show that thevolume resistivity of PP/CPP/PANI composites decreases with increasing CPP content, and there exists a minimum volume resistivity. The relationship…
Thermal noise in multilayer optical coatings may not only limit the sensitivity of future gravitational wave detectors in their most sensitive frequency band but is also a major impediment for experiments that aim to reach the standard quantum limit or to cool mechanical systems to their quantum ground state. Here, we…
In this paper, we outline a method for the fabrication of biomimetic hollow fiber and hollow fiber bundles with high aspect ratios. The manufacturing process utilizes a melt spinning technique with caramelized sucrose as a core template. Encapsulation of the sucrose with a thin layer of degradable polymer and selectiv…
Fundamental and higher harmonics of the ac magnetic susceptibility have been measured on ${\text{LaFeAsO}}_{0.92}{\text{F}}_{0.08}$ samples as a function of the temperature, at various amplitudes and frequencies of the ac magnetic field, with a small superimposed dc field parallel to the ac field. The granularity of t…
In this study, we examined the maximum meniscus height of liquids at the top edge of vertically oriented rods and disks. Poly(tetrafluoroethylene) (PTFE) and polycarbonate (PC) rods (and disks) were placed in clear containers, and then water or ethylene glycol was slowly added. Liquid rose along the sides of the rods…
An investigation has been conducted on the corrosion inhibition of mild steel by molybdate, nitrite and zinc ions in aqueous chloride media containing cupric ions. Molybdate inhibits mild steel corrosion in near neutral and alkaline (pH 6 and above) chloride media and accelerates corrosion in acidic media (below pH 6)…
We determine the low-temperature optical properties of dark-exciton states in CdSe/CdS nanocrystal quantum dots (NQDs). By using resonant laser excitation we distinguish zero-phonon from phonon-assisted photoluminescence. The NQDs show a decreasing zero-phonon intensity with decreasing temperature, resulting in a reds…
In surface enhanced raman scattering (SERS) the problem of drawing molecules to the places where surface plasmon resonance enhancements will produce signals is one of the most basic ones, and the initial obstacle to every application of the effect. We explore the possibility of using electrostatic forces as a means to…
Foreign object damage behavior of an oxide/oxide (N720/AS) ceramic matrix composite was determined at ambient temperature using impact velocities ranging from 100 m/s to 400 m/s by 1.59 mm diameter steel-ball projectiles. Two different support configurations of target specimens were used: fully supported and partially…
The local lattice structure in ${\text{LaFeAsO}}_{1\ensuremath{-}x}{\text{F}}_{x}$ superconductors is studied by extended x-ray absorption fine-structure measurements. An anomalous upturn of the mean-square relative displacement of the Fe-As bond is detected below $\ensuremath{\sim}70\text{ }\text{K}$ as electron carr…
The temperature dependences of the magnetizations of individual atomic layers across an epitaxial antiferromagnetic EuTe film were derived from virtually background-free magnetic Bragg peaks with pronounced Laue oscillations recorded with soft x rays at the Eu-M5 resonance. The magnetizations of the outermost layers d…
This work reports the first synthesis of macroporous carbon nanotube arrays with tunable pore sizes, and these porous arrays provide simple and efficient templates for synthesizing composite carbon nanotube-polymer materials.
Abstract The isothermal crystallization kinetics, the morphology, and the melting behavior of melt‐processed composites of poly(phenylene sulfide) (PPS) with a thermotropic liquid crystalline copolyester, Vectra A950, (TLCP) were studied by differential scanning calorimetry (DSC) and optical microscopy. The crystalliz…
The apparent discrepancies between density functional (DFT) and Mϕller−Plesset (MP2) calculations for the interaction of lithium with graphene recently pointed out by Ferre-Vilaplana ( J. Phys. Chem. C 2008, 112, 3998) are discussed. In his calculations, this author used a finite coronene cluster, C 24 H 12, to simula…
A single layer of dense Si quantum dots with average size of 4 nm sandwiched in amorphous SiN layers was prepared by laser crystallization of ultrathin amorphous Si film followed by subsequently thermal annealing. The electroluminescent diodes were fabricated by evaporating Al electrodes on back sides of p-Si substrat…
In order to characterize very weak adhesive surfaces, we have developed a quantitative test inspired by the Johnson, Kendall, and Roberts adhesion test for soft adhesives, which relies on the formation and then the rupture of a capillary bridge between the surface to be tested and a liquid bath. Both the shape and the…
Abstract Multi‐walled carbon nanotubes (MWCNTs) have been produced with high selectivity by fluidized bed catalytic chemical vapor deposition from ethylene on Fe/Al 2 O 3 catalysts. The influence of operating parameters such as deposition duration, temperature, ethylene and hydrogen partial pressures, and iron loading…
An innovative technique combining phase transition and microprinting in one step was applied to fabricate the nerve conduits used in peripheral nerve regeneration. The asymmetric microporosity served to generate asymmetric permeability, and the surface microgrooves were introduced to achieve cell alignment in vitro. T…
We report the first observation of single-shot soft x-ray laser induced desorption occurring below the ablation threshold in a thin layer of poly (methyl methacrylate)--PMMA. Irradiated by the focused beam from the Free-electron LASer in Hamburg (FLASH) at 21.7 nm, the samples have been investigated by atomic-force mi…