Materials Literature
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We correlate topography and diffraction measurements to demonstrate that grain orientation profoundly influences polishing rates in polycrystalline diamond synthesized by chemical vapor deposition. Grains oriented with {111} or {100} planes perpendicular to the surface normal polish at significantly lower rates compar…
Many years have been devoted to study the behaviour of solids submitted to impinging particles like ions or neutrons. The nuclear evaluations describe more and more accurately the various neutron–atom interactions. Anisotropic neutron–atom cross-sections are now available for many elements. Moreover, clear mathematica…
We report a rather high dependence of the dielectric permittivity on the magnetic field in La2∕3Ca1∕3MnO3. The variation is maximum at around 270K, little above the Curie temperature TC, and it reaches a 35% under only 0.5T. We attribute this phenomenon to the space-charge or interfacial polarization produced between…
Electron field emission measurements on individual carbon nanotubes (CNTs) were performed inside a transmission electron microscope. Controlled removal of carbon atoms at the tip of the CNT was realized and various tip structures were fabricated. In particular, a capped CNT was opened and an opened CNT was converted i…
In this paper, we present our work on an optical biosensor for the detection of the interaction between a DNA single strand and its complementary oligonucleotide, based on the porous silicon (PSi) microtechnology. The crucial point in this sensing device is how to make a stable and repeatable link between the DNA prob…
Aligned single-crystal WO2.9 nanowires are grown directly from tungsten substrates at high rates using a flame synthesis method. The nanowires have diameters of 20–50nm, lengths >10μm, coverage density of 109–1010cm−2, and growth rates >1μm∕min. Growth occurs by the vapor-solid mechanism, with local gas-…
The synthesis and densification of fairly dense nanocrystalline SrTiO 3 and its characterization are described in this paper in detail. Significant grain growth was avoided by the application of a two‐stage sintering process using hot pressing. High‐resolution transmission electron microscopy and electron energy loss…
Abstract A well‐defined amphiphilic copolymer brush with poly(ethylene oxide) as the main chain and polystyrene as the side chain was successfully prepared by a combination of anionic polymerization and atom transfer radical polymerization (ATRP). The glycidol was first protected by ethyl vinyl ether to form 2,3‐epoxy…
Abstract Summary: Linear low density polyethylene/maleic anhydride grafted polyethylene/montmorillonite clay (LLDPE/PEMA/clay) nanocomposites prepared using a co‐rotating twin screw extruder exhibit unique thermal, rheological, and mechanical behaviors. All the mechanical properties including ductility increase with c…
Flowerlike ZnO nanocone and nanowire arrays have been grown on a Zn foil via a solution-phase approach at low temperature. The tips of the nanocones are about 70–160nm in diameter and their roots are as thick as 350nm; the diameters of the nanowires are around 70–110nm. Both the nanocones and nanowires grow preferenti…
Using atomic force microscopy height maps, we resolve and quantify torsional fluctuations in one-dimensional amyloid fibril aggregates self-assembled from three different representative polypeptide systems. Furthermore, we show that angular correlation in these nanoscale structures is maintained over several microns,…
Superhydrophobic carbon nanotubes (CNTs) were prepared by low-pressure CF4 glow plasma to provide roughness and fluorination in CNTs. The water droplet falling freely on the superhydrophobic CNT powders bounced dynamically. The superhydrophobicity resulted from the combined effects of the chemical modification and sur…
We studied the cross-plane lattice and electronic thermal conductivities of superlattices made of InGaAlAs and InGaAs films, with the latter containing embedded ErAs nanoparticles (denoted as ErAs:InGaAs). Measurements of total thermal conductivity at four doping levels and a theoretical analysis were used to estimate…
Spaced out: Single-walled carbon nanotubes (SWNTs) with covalently linked tetrathiafulvalene (TTF) derivatives have been synthetized and fully characterized as potential donor–acceptor nanoconjugates. Near-infrared flourescence and transient absorption measurements showed that the charge recombination dynamics is a fu…
Mg–Ti–H thin films are found to have very attractive optical properties: they absorb 87% of the solar radiation in the hydrogenated state and only 32% in the metallic state. Furthermore, in the absorbing state Mg–Ti–H has a low emissivity; at 400K only 10% of blackbody radiation is emitted. The transition between both…
Silver nanoparticles prepared through reduction of AgNO 3 by ethanol under refluxing conditions in polyvinyl pyrrolidone (PVP) ethanol solution were dispersed into PVP nanofibre film by electrospinning. The optical properties of Ag nanoparticles in PVP ethanol solution were measured by ultraviolet–visible (UV–vis) spe…
YBCO films were prepared by pulsed laser deposition from nanocrystalline targets doped with different concentrations of BaZrO 3 ranging from c = 0.9 to 9.0 wt%. The critical temperature of the films decreases almost linearly with increasing BaZrO 3 content whereas the critical current density shows a maximum near 3.9…
(Mn, N)-codoped ZnO films were grown on fused silica substrates by reactive magnetron cosputtering. X-ray diffraction measurements reveal that the films have the single-phase wurtzite structure with c-axis preferred orientation. X-ray photoelectron spectroscopy studies indicate the incorporation of both divalent Mn2+…
We have found experimentally and theoretically that laminated composites comprising one layer of length-magnetized Tb0.3Dy0.7Fe1.92 (Terfenol-D) magnetostrictive alloy sandwiched between two layers of thickness-polarized, electro-parallel-connected 0.7Pb(Mg1∕3Nb2∕3)O3–0.3PbTiO3 (PMN–PT) piezoelectric single crystal ha…
Inspired by the self-cleaning behaviour of lotus leaves in nature, we developed a simple coating method that can facilitate the bionic creation of super-hydrophobic surfaces on various substrates, thus providing a feasible way of fabricating super-hydrophobic surfaces for civil and industrial applications. Micro–nanos…