Materials Literature
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A free-standing polysaccharide nanosheet prepared by using a spin-coating-assisted layer-by-layer method is transferred from silicone rubber onto human skin (see figure) by fabricating a three-layered ‘nano-adhesive plaster' involving a water-soluble sacrificial layer. By using this novel technique, conventional ultra…
A detailed simple model is applied to study a metallic cluster. It is assumed that the ions and delocalized electrons are distributed randomly throughout the cluster. The delocalized electrons are assumed to be degenerate. A spherical ball models the shape of a cluster. The energy of the microscopic electrostatic fiel…
Semiclassical description, based on electrostatics and Thomas-Fermi model is applied here to calculate dimensions of the electronic shell of a fullerene molecule and a nanotube. The internal radius of the electronic shell of a fullerene molecule, calculated within the framework of the model is 0.2808 nm. The external…
We propose to tailor exchange interactions in magnetic monolayer films by tuning the adjacent non-magnetic substrate. As an example, we demonstrate a ferromagnetic-antiferromagnetic phase transition for one monolayer Fe on a Ta(x)W(1-x)(001) surface as a function of the Ta concentration. At the critical Ta concentrati…
A series of epitaxial (LaVO3)6m(SrVO3)m superlattices having the same nominal composition as La6∕7Sr1∕7VO3, a Mott-Hubbard insulator, was grown with pulsed-laser deposition on [001]-oriented SrTiO3 substrates, and their superlattice period was varied. When m=1, the insulating resistivity of bulklike La6∕7Sr1∕7VO3 is o…
We have developed the combination of an etching and deposition techniques that enables the fabrication of locally gated graphene nanostructures of arbitrary design. Employing this method, we have fabricated graphene nanoconstrictions with local tunable transmission and characterized their electronic properties. An ord…
Solution processable photodetectors operating up to 3 μm cut-off wavelength based on HgTe nanocrystals are demonstrated. Ink-jet printing is employed for the accurate deposition of the nanocrystals on the electrodes. The highly reproducible photodetectors exhibit high sensitivities for small illumination powers, makin…
We report on the structural and magnetic properties of thin ${\mathrm{Ge}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}$ films grown by molecular beam epitaxy (MBE) on $\mathrm{Ge}(001)$ substrates at temperatures $({T}_{g})$ ranging from 80 to $200\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$, with…
Phonons change remarkable the interatomic bond length in solids and this work suggest a novel method how this behavior can be displayed and analyzed. The bond-length spectrum is plotted for each of the different atomic bonding types. When comparing the bond-length to an un-deformed crystal by the so-called difference…
We present a comprehensive study of the low-field magnetoresistance in carbon doped p-type GaAs/AlGaAs heterostructures aiming at the investigation of spin-orbit interaction effects. The following signatures of exceptionally strong spin-orbit interactions are simultaneously observed: a beating in the Shubnikov-de Haas…
Results of Rietveld analysis of the synchrotron x-ray diffraction data on Pb(ZrxTi1−x)O3 (PZT) for 0.525⩽x⩽0.60 are presented to show the absence of rhombohedral phase on the Zr-rich side of the morphotropic phase boundary. Our results reveal that the structure of PZT is monoclinic in the Cm space group for 0.525⩽x⩽0.…
The self-assembly of polypeptides into stable, conductive, and intrinsically fluorescent biomolecular nanowires is reported. We have studied the morphology and electrical conduction of fibrils made of an elastin-related polypeptide, poly(ValGlyGlyLeuGly). These amyloid-like nanofibrils, with a diameter ranging from 20…
Electrospun mats with complex ordered architectures are fabricated by using patterned conductive collectors. The effect of the diameter of the web wires and the protrusions on the formation of the patterns of the fibrous materials are elaborated and woven structures that have been generated by a time-dependent control…
Electrospinning magnetic-nanoparticle-doped polymers under the influence of a magnetic field produces aligned arrays of fibers over large areas (see figure). These nanofibers can be transferred onto the surfaces of other substrates. They can also be stacked into multilayer grids.
Abstract Since the mid 1990s soluble, well‐characterized high molecular weight metal‐containing and metallosupramolecular polymers have become readily available for the first time, even in some cases, with narrow molecular weight distributions and controlled architectures such as block copolymers. This has led to a ra…
Abstract Currently, use of poly(lactic acid) (PLA) for injection molded articles is limited for commercial applications because PLA has a slow crystallization rate when compared with many other thermoplastics as well as standard injection molding cycle times. The overall crystallization rate and final crystallinity of…
Several general results are derived for diffuse waves in anisotropic solids, including concise expressions for the modal density per unit volume and for the participation factor matrix G. The latter is a second order tensor which describes the orientational distribution of diffuse wave or reverberant energy, and reduc…
We present a study of the photoluminescence (PL) properties of heavily Be delta-doped GaAs/AlAs multiple quantum wells measured at room and liquid nitrogen temperatures. Possible mechanisms for photocarriers recombination are discussed, with a particular focus on the peculiarities of the excitonic and free carriers-ac…
Summary 1. The European Union's Water Framework Directive requires all water bodies to achieve ‘good ecological status’ by 2015 and this paper describes a rationale for defining ‘good ecological status’ based on diatoms, a significant component of the biological quality element ‘macrophyte and phytobenthos’. 2. A data…
Abstract Carbon nanomaterials such as carbon nanotubes (CNTs) and carbon nanospheres (CNS) were synthesized from sucrose solution using an arc discharge method without graphite electrodes. In this process, the nanocarbon products were formed from carbon atoms supplied by the sucrose in solution rather than from the gr…