Materials Literature
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Mind the step! Single-wall carbon nanotubes grow along the atomic steps of vicinal α-Al2O3 surfaces to give highly aligned arrays of nanometer-wide wires on a dielectric material. The nanotubes (see blue background image) reproduce the atomic features of the surface including steps, facets, and kinks (see model). The…
We show that the electric polarization at the interface with ultrathin superconducting (S) films sandwiched between ferroelectric (FE) layers allows achievement of substantially stronger modulation of inner carrier density and superconducting transition temperature as compared to FE-S bilayers typically used in superc…
Vorsicht Stufe! Einwandige Kohlenstoff-Nanoröhren wachsen entlang den Stufen benachbarter α-Al2O3-Oberflächen und ergeben ausgerichtete Anordnungen von nanometerbreiten Drähten auf einem dielektrischen Material. Die Nanoröhren (siehe Bild im Hintergrund) geben die Eigenschaften der Oberfläche wieder, z. B. Stufen, Fac…
Carbon nanotube field-effect transistors (CNFETs) are being extensively studied as possible successors to CMOS. Novel device structures have been fabricated and device simulators have been developed to estimate their performance in a sub-10-nm transistor era. This paper presents a novel method of circuit-compatible mo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRole of Electronic Structure in the Susceptibility of Metastable Transition-Metal Oxide Structures to TransformationJohn Reed and Gerbrand CederView Author Information Department of Materials Science and Engineering, Massachusetts Institute of Technology, Building 13-5056, 7…
The process of electrospinning produces polymeric fibers with diameters ranging from the micrometer to the nanometer scale. As the fibers are produced, they are usually spun and collected in a random mat lacking structural orientation. In some applications there is interest in parallel alignment of nanofibers to produ…
Raman spectroscopy is a standard characterization technique for any carbon system. Here we review the Raman spectra of amorphous, nanostructured, diamond-like carbon and nanodiamond. We show how to use resonant Raman spectroscopy to determine structure and composition of carbon films with and without nitrogen. The mea…
This book surveys the broad field of mechanical alloying from a scientific and technological perspective to form a timely and comprehensive resource valuable to both students and researchers. The treatment progresses from the historical background through a description of the process, the different metastable effects…
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The redistribution of impurities in a sample in the shape of a slab filled with an isotropic liquid submitted to an external field is considered. The case in which the impurities are ions dissolved in the liquid, and the external field is an electric field is also investigated. It is shown that the intrinsic time conn…
Abstract For Abstract see ChemInform Abstract in Full Text.
Auger Electron Spectroscopy (AES) is a fast, “non-destructive” analytical technique used to determine the elemental composition of the top few atomic layers of a surface or exposed interface in a s...
By means of transmission electron microscopy (TEM) the structure of chemically ordered regions in Zr-doped Pb(Mg1∕3Ta2∕3)O3 has been studied. Large coherent ordered domains were obtained by the addition of 5mol%PbZrO3. The results obtained by conventional, analytical, and high-resolution TEM are consistent with the ra…
Two new series of chiral aliphatic and aromatic esters of 7-decyl[1]benzothieno[3,2-b][1]benzothiophene-2-carboxylic acid were synthesized and their mesomorphic behaviour studied. While the chiral aliphatic esters exhibited only the SmA phase, the antiferroelectric SmCA* phase was found for esters with chiral 4-hydrox…
We report the synthesis and liquid crystalline properties of novel mesogenic octaalkyloxytetraphenylenes. Starting from 4-bromoveratrol, the saddle-shaped target tetraphenylenes were obtained in five steps. Compounds with shorter C7–C12 alkyl chain lengths displayed enantiotropic hexagonal columnar mesophases. For the…
The mechanical properties of high-quality single crystals of tetragonal hen-egg-white lysozyme from hen egg white were investigated by the indentation method. The indentation marks were clearly observed on the crystal surface and elastic recovery did not occur. The micro-Vickers hardness of the crystals in the wet con…
We report a liquid crystal photoalignment material with high photosensitivity and excellent thermal stability. The chloromethylated aromatic polyimide exhibited defect-free homogeneous alignment of liquid crystals upon irradiation of polarized deep ultraviolet (UV) for 50s. The aligning ability of the film was retaine…
We report the observation of surface relief gratings (SRGs) on polymer dispersed liquid crystal films after polarization holographic recording, demonstrating the formation of SRGs in systems without azo compounds, where photoisomerization and chromophore reorientation processes do not occur. Permanent SRGs, several hu…
We have thoroughly investigated the effect of oxygen nonstoichiometry on the electrical transport characteristics of ZnO1−δ films. These films were grown on optical grade quartz substrates by using a pulsed laser deposition technique. In order to alter the amount of oxygen nonstoichiometry (δ), oxygen partial pressure…
The thermo-optic effect of Si nanocrystals in silicon-rich silicon oxide (SRSO) thin films at 1530nm is investigated. SRSO thin films, which consist of nanocrystal Si (nc-Si) embedded inside the SiO2 matrix, were prepared by electron-cyclotron-resonance plasma-enhanced chemical vapor deposition of SiH4 and O2 followed…