Materials Literature
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Ss-LrpB, a novel Lrp-like DNA-binding protein from the hyperthermophilic crenarchaeon Sulfolobus solfataricus, was shown to bind cooperatively to three regularly spaced targets in its own control region, with as consensus the 15 bp palindrome 5'-TTGYAW WWWWTRCAA-3'. Binding to the border sites occurred with high affin…
Patterned alignment layers have been created through an approach using polarization holography and a photopolymerizable alignment layer. This technique enables continuously periodic boundary conditions on planar surfaces. Polarization gratings have been created using polarization interference from incident right-hande…
Abstract Summary: For industrial polymer applications, the structure‐property relation during thermal treatment is of high interest. If a polymer is degraded, its molecular structure will alter, and its mechanical properties are affected as well; thus limiting the usability. The objective of this paper is to highlight…
We report experimental observations of shell buckling instabilities in freestanding, vertically aligned multiwalled carbon nanotubes subjected to uniaxial compression. Highly ordered and uniform arrays of carbon nanotubes embedded in an alumina matrix were fabricated and subjected to uniaxial compression using a nanoi…
A multiwalled carbon nanotube∕polyaniline composite with cablelike morphology has been synthesized by an in situ chemical oxidative polymerization directed with cationic surfactant cetyltrimethylammonium bromide. It is interestingly found that with increasing carbon nanotube loading from 0 to 24.8wt%, the conductivity…
Organic field-effect transistors were fabricated with pentacene as the active material and a ferroelectric copolymer poly(vinylidene fluoride–trifluoroethylene) as the gate insulator. As-prepared devices showed normal p-type transistor operation. The ON- and OFF-states could be written to the device by applying approp…
A transparent p-type semiconductor, CuAlO2, shows selective and reversible response to ozone gas at room temperature. All existing commercial semiconductor ozone sensors are of n type. This study demonstrates the feasibility of developing an inexpensive p type and transparent ozone sensor. Types of transparent p–n jun…
A new class of phenomena discussed in this review is based on interaction between spatially separated, but closely located ferromagnets and superconductors. They are called Ferromagnet-Superconductor Hybrids (FSH). These systems include coupled smooth and textured Ferromagnetic and Superconducting films, magnetic dots…
A double minimum has recently been observed in the time–voltage switching response for a smectic C* liquid crystal layer in the surface stabilized geometry (“Ferroelectric Liquid Crystal Device,” K. P. Lymer and J. C. Jones, U.K. Patent No. GB2338797, 17th June 1999). Liquid crystal continuum theory is used to demonst…
Hall effect measurements have been carried out to determine the carrier density and mobilities in ultrananocrystalline diamond films grown with added nitrogen. The results show clear n-type conductivity with very low thermal activation energy. Mobility values of 1.5cm2V−1s−1 are found for a sheet carrier concentration…
High-resolution transmission electron microscopy examination of carbon nanotube–polyacrylonitrile composite fibers synthesized by electrospinning was conducted. Both single-wall carbon nanotubes and multi-wall carbon nanotubes have been used to reinforce the polymer fibers. A two-stage rupture behavior of the composit…
We study the fundamental magnetic states of disc-shaped ferromagnetic particles with a uniaxial anisotropy along the symmetry axis. Besides the monodomain, a bidomain state is also identified and studied both numerically and theoretically. This bidomain state consists of two coaxial oppositely magnetized cylindrically…
Abstract Summary: An electrospun nonwoven fabric of a cationic polysaccharide, chitosan, was successfully prepared. The present study focuses on the effect of the electrospinning solvent and the chitosan concentration on the morphology of the resulting nonwoven fabrics. The solvents tested were dilute hydrochloric aci…
We discuss the annealing-dependence of exchange bias in Ga1-xMnxAs epilayers that are overgrown with Mn. Although pure Mn is a known antiferromagnet, we find that the as-grown Mn overlayer does not produce any exchange coupling with Ga1-xMnxAs. Rather, our studies indicate that annealing in air is essential for creati…
Electrostatic force microscopy at cryogenic temperatures is used to probe the electrostatic interaction of a conductive atomic force microscopy tip and electronic charges trapped in localized states in an insulating layer on a semiconductor. Measurement of the frequency shift of the cantilever as a function of tip-sam…
We present a complete description of spin injection and detection in Fe/Al_xGa_{1-x}As/GaAs heterostructures for temperatures from 2 to 295 K. Measurements of the steady-state spin polarization in the semiconductor indicate three temperature regimes for spin transport and relaxation. At temperatures below 70 K, spin-p…
Random dense packing of binary hard discs generated under the infinitesimal gravity protocol is investigated by a Monte Carlo simulation in the entire region of the size ratio and the concentration. When the size difference of the two species is small, the packing fraction of disc assembly becomes lower than that of t…
In a review of supercooled and glassy water Debenedetti (2003 J. Phys.: Condens. Matter 15 R1669) proposes that the boiling line for supercooled water (a binodal) can meet a conjectured low temperature limit of stability for supercooled water (a spinodal) only at a critical point. This comment offers a counter-example…
Abstract A solution-phase route has been developed for the synthesis of cobalt phosphide nanorods, which have been characterized by techniques of X-ray diffraction (XRD), electron microscope (SEM), and X-ray photoelectron spectroscope (XPS). The microscope analysis reveals that the nanorods have width of about 10 nm a…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTTotal Core Functionalization of a Hyperbranched PolymerPeter J. Gittins, Jan Alston, Yi Ge, and Lance J. TwymanView Author Information The Polymer Centre, Chemistry Department, The University of Sheffield, Sheffield, S2 7HF, UK Cite…