Comment on "Highly Extended Image States around Nanotubes"
A Comment on the Letter by Granger et.al., Phys. Rev. Lett. 89, 135506 (2002).
Materials Literature
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Singlet-energy transfer in quadruple hydrogen-bonded oligo(p-phenylenevinylene)perylene-diimide dyads
The photophysical properties of a supramolecular donor-acceptor dyad consisting of an oligo(p-phenylenevinylene) unit and a perylene-diimide unit are described. The dyad is created by functionalising the two chromophores with quadruple hydrogen bonding 2-ureido-4[1H]-pyrimidinone units, which provide a high associatio…
Determining the structure of active sites, transition states and intermediates in heterogeneously catalysed reactions
With open-structure (nanoporous) oxidic solids, numerous distinct kinds of single-site catalysts may be precisely designed. Apart from serving as a means of generating a range of powerful new catalysts (especially for selective oxidations), in which well-defined active sites are carefully engineered, the detailed loca…
Granular systems in the Coulomb blockade regime
Disordered granular systems, at temperatures where charging effects are important, are studied, by means of an effective medium approximation. The intragrain charging energy leads to insulating behavior at low temperatures, with a well defined Coulomb gap. Non equilibrium effects can give rise to a zero temperature tr…
High quality GaMnAs films grown with As dimers
We demonstrate that GaMnAs films grown with As2 have excellent structural, electrical and magnetic properties, comparable or better than similar films grown with As4. Using As2, a Curie temperature of 112K has been achieved, which is slightly higher than the best reported to date. More significantly, films showing met…
Phasons and the Plastic Deformation of Quasicrystals
The plastic deformation of a quasicrystal (QC) is ruled by singularities of its 'phonon' strain field and of its 'phason' strain field. In the framework of the topological theory of defects, and the QC being defined as an irrational subset of a high dimensional crystal, both types of defects appear as distinct compone…
Ferroelectricity, SSFLC, bistability and all that
In the book "Ferroelectric and Antiferroelectric Liquid Crystals" by S. T. Lagerwall, the concept "polar liquid crystals" is proposed for the concept earlier known as "ferroelectric liquid crystals", reserving the word "ferroelectric liquid crystals" for the case of "surface stabilization". Thus Lagerwall in this way,…
Adsorbate-induced Surface Stiffening: Surface Lattice Dynamics of Ru(001)-(1x1)-O
The dynamical properties of the high-density Ru(001)-(1$\times$1)-O phase has been investigated by a combined high-resolution electron energy loss spectroscopy and density functional theory study. Due to a strong static outward relaxation of the first Ru layer a soft Rayleigh phonon mode is expected. However, a Raylei…
Anisotropic Magnetoresistance in GaMnAs films
The magnetoresistance in a series of Ga1-xMnxAs samples with 0.2 =< x =< 0.8 have been measured for three mutually orthogonal orientations of the external magnetic field. The anisotropy magnetoresistance decreases with increasing of the Mn content, which means that the magnetic disorder or defects scattering increases…
In Vivo Imaging of Quantum Dots Encapsulated in Phospholipid Micelles
Fluorescent semiconductor nanocrystals (quantum dots) have the potential to revolutionize biological imaging, but their use has been limited by difficulties in obtaining nanocrystals that are biocompatible. To address this problem, we encapsulated individual nanocrystals in phospholipid block-copolymer micelles and de…
Inner-Sphere Complexation of Cobalt(II) 2,9-Dimethyl-1,10-phenanthroline ([Co(neo)]2+) with Commercial and Sol−Gel Derived Silica Gel Surfaces
[Co(2,9-dimethyl-1,10-phenanthroline)(solvent)4]2+ ([Co(neo)]2+) undergoes a significant decrease in symmetry to form an inner-sphere surface complex when grafted directly on performed silica or introduced during the sol-gel process. The visible and X-ray absorption spectra of the surface adducts are interpreted in te…
Design and analysis of modified Rotman type multiple beam forming lens
A modified approach to design Rotman (1963) type multiple beam forming lens has been proposed. The path length error at the wavefront has been calculated. The error obtained by the proposed approach and by the conventional approach has been compared. Two-dimensional electromagnetic field analysis of the lens obtained…
Effects of oxygen annealing on the physical properties and surface microstructures of La0.8Ba0.2MnO3films
We have investigated the effects of oxygen annealing on the transport properties and surface microstructures of epitaxial La 0.8 Ba 0.2 MnO 3 (LBMO) films deposited on SrTiO 3 substrate at different oxygen pressures using the pulsed laser deposition technique. The thickness dependence of the transport properties was s…
Qualitative analysis of a bulk ferromagnetic hysteresis model
We present a set of equations for a bulk ferromagnetic hysteresis model. We establish the connection between this set of equations and classical energy loss expressions for ferromagnetic hysteresis. We show analytically that for periodic inputs the system of equations has a limit set that is a periodic orbit in the H-…
Atomic thermal motions studied by variable-temperature X-ray diffraction and related to non-linear optical properties of crystalline meta-di-nitrobenzene
The meta-dinitrobenzene crystal structure has been determined at five temperatures in the 100-300 K temperature range. The thermal expansion coefficients have been calculated from the temperature variation of the lattice parameters. Rigid-body motion analysis with allowance for large-amplitude internal motions provide…
The structure of orange HgI2. I. Polytypic layer structure
The metastable orange crystals of HgI(2) comprise three different crystal structures, all of which are built from corner-linked Hg(4)I(10) supertetrahedra. Two of them are end members with the maximum degree of order (MDO) of a polytypic layer structure; the third shows a three-dimensional linkage. This paper presents…
Synthesis of a nonionic water soluble semiconductive polymer
A new nonionic water-soluble fluorescent conjugated polymer is reported with hydroxyl and amide side chains surrounding an aromatic polymer backbone.
Atomic displacement parameters for spessartine Mn3Al2Si3O12 and their lattice-dynamical interpretation
A rigid-ion lattice-dynamical treatment accounts reasonably well for most of the atomic displacement parameters (ADPs) reported in the literature for a synthetic sample of spessartine Mn(3)Al(2)Si(3)O(12); the model accounts less well for the ADPs of the Mn atom. These results are similar to those obtained for the cor…
Porous silicon technology for RF integrated circuit applications
Coplanar transmission lines were fabricated on porous silicon layers of varying thickness, in the range of 1-15 /spl mu/m, on silicon substrates. For suitably thick porous silicon regions, the capacitive coupling to the conducting silicon substrate and the associated attenuation are suppressed. The use of porous silic…
The incommensurate modulation of the structure of Sr2Nb2O7
The incommensurately modulated structure of Sr(2)Nb(2)O(7) at room temperature is reported, as determined by single-crystal X-ray diffraction. The crystal structure of Sr(2)Nb(2)O(7) comprises slabs with a perovskite-type structure that are separated by planes of additional O atoms. The driving force for the modulatio…