Comment on “Atomic Shuffling Dominated Mechanism For Deformation Twinning In Magnesium”
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Materials Literature
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Dipolar Molecules as Impellers Achieving Electric-Field-Stimulated Release
Here we report the design of a new external electric field-controlled release system using functional dipolar molecules as nanoimpellers. The dipolar molecule 4-(3-cyanophenyl)butylene, which can reorient in response to external electric fields with different frequencies because of its strong inherent dipole moment, w…
Vanadium(II) Heptacyanomolybdate(III)-Based Magnet Exhibiting a High Curie Temperature of 110 K
We prepared a vanadium heptacyanomolybdate-based magnet, V(II)(2)[Mo(III)(CN)(7)].(pyrimidine)(2).4.5H(2)O (VMo), with a Curie temperature (T(C)) of 110 K, which is the highest T(C) value in [Mo(III)(CN)(7)]-based magnets. Additionally, Mn(II)(2)[Mo(III)(CN)(7)].(pyrimidine)(2).2H(2)O (MnMo) of a monoclinic structure…
Band-gap nonlinearity in perovskite structured solid solutions
Compositional effects on optical band-gap energy using end members of ABO3 perovskites have been investigated through an optical absorption with a UV-spectroscopy. Three examples are selected, namely, BaTiO3–CaTiO3, BaTiO3–BaZrO3, and SrTiO3–BaZrO3 solid solutions. To understand the role of high temperature phase equi…
Structural and Electrochemical Characterization of Metastable PtAu Bulk and Surface Alloys Prepared by Crossed-Beam Pulsed Laser Deposition
Crossed-beam pulsed laser deposition in a moderate He background gas pressure was used to prepare PtAu thin films. The Pt bulk content was determined by neutron activation analysis, whereas X-ray diffraction and X-ray photoelectron spectroscopy were used to assess the bulk and the surface structure of the films, respe…
Self-Assembly and Hierarchies in Pyridine-Containing Homopolymers and Block Copolymers with Hydrogen-Bonded Cholesteric Side-Chains
We investigate supramolecular complexes where a mesogenic molecule, cholesteryl hemisuccinate (CholHS), is hydrogen-bonded to a homopolymer, poly(4-vinylpyridine) (P4VP), to allow liquid crystallinity and to block copolymer polystyrene- block -poly(4-vinylpyridine) (PS- b -P4VP), to allow hierarchical self-assembly. B…
Nanoparticles on Polyelectrolytes at Low Concentration: Controlling Concentration and Size
Previously reported results on nanoparticle distribution control on polyelectrolyte multilayers at high concentrations are presented here for the case of low concentration ( Skirtach, A. G.; Dejugnat, C.; Braun, D.; Susha, A. S.; Rogach, A. L.; Sukhorukov, G. B. J. Phys. Chem. C 2007, 111, 555). In sharp contrast to t…
Positron annihilation study of the interfacial defects in ZnO nanocrystals: Correlation with ferromagnetism
High purity ZnO nanopowders were pressed into pellets and annealed in air between 100 and 1200 °C. The crystal quality and grain size of the ZnO nanocrystals were investigated by x-ray diffraction 2θ scans. Annealing induces an increase in the grain size from 25 to 165 nm with temperature increasing from 400 to 1200 °…
Lithium related deep and shallow acceptors in Li-doped ZnO nanocrystals
We study the existence of Li-related shallow and deep acceptor levels in Li-doped ZnO nanocrystals using electron paramagnetic resonance (EPR) and photoluminescence (PL) spectroscopy. ZnO nanocrystals with adjustable Li concentrations between 0% and 12% have been prepared using organometallic precursors and show a sig…
Infrared Induced Reactivity on the Surface of Isolated Size-Selected Clusters: Dissociation of N2O on Rhodium Clusters
Multiple photon infrared excitation of size-selected Rh(6)N(2)O(+) clusters drives surface chemistry resulting in partially oxidized clusters.
Emission color variation of (Ba,Sr)_3BP_3O_12:Eu^2+ phosphors for white light LEDs
A series of alkaline earth borophosphate phosphors, (Ba,Sr)(3)BP(3)O(12) doped with Eu(2+) ions, were synthesized by a solid state reaction. Two emission bands at 465 nm and 520 nm were attributed to the f-d transitions of doped Eu(2+) ions occupying in two different cation sites in host lattices and emission color va…
Evolution of Linear Absorption and Nonlinear Optical Properties in V-Shaped Ruthenium(II)-Based Chromophores
In this article, we describe a series of complexes with electron-rich cis-{Ru(II)(NH(3))(4)}(2+) centers coordinated to two pyridyl ligands bearing N-methyl/arylpyridinium electron-acceptor groups. These V-shaped dipolar species are new, extended members of a class of chromophores first reported by us (Coe, B. J. et a…
Single-Chamber Solid Oxide Fuel Cell Technology—From Its Origins to Today’s State of the Art
In single-chamber solid oxide fuel cells (SC-SOFCs), both anode and cathode are situated in a common gas chamber and are exposed to a mixture of fuel and oxidant. The working principle is based on the difference in catalytic activity of the electrodes for the respective anodic and cathodic reactions. The resulting dif…
Interaction of nitrogen plasmas with tungsten
The use of nitrogen seeding to reduce the edge plasma temperature has recently been successfully applied in ASDEX Upgrade. While the plasma performance was significantly improved compared with other seeding species such as Ar or Ne, questions remained as to the interaction of nitrogen with a tungsten first wall. In pa…
Low-Coordinate and Neutral Nitrido Complexes of Vanadium
Two neutral and four-coordinate vanadium(V)-nitrido complexes have been prepared via the thermolysis of metastable vanadium(III)-azido precursors. All complexes have been fully characterized by multinuclear NMR, FT-IR, isotopic labeling, and, in most instances, single crystal X-ray diffraction. On the basis of activat…
Synchrotron Speciation of Silver and Zinc Oxide Nanoparticles Aged in a Kaolin Suspension
Assessments of the environmental fate and mobility of nanoparticles must consider the behavior of nanoparticles in relevant environmental systems that may result in speciation changes over time. Environmental conditions may act on nanoparticles to change their size, shape, and surface chemistry. Changing these basic c…
Thermodynamic Effects in Nanoscale NaAlH4
The hydrogen uptake in NaAlH4 infiltrated into a microporous carbon fibre matrix is investigated. The composite material exhibits a significant change in its thermodynamic properties as can be seen from the comparison of the pressure composition isotherms of the encapsulated material with the one obtained for bulk NaA…
High K Capacitors and OFET Gate Dielectrics from Self‐Assembled BaTiO3 and (Ba,Sr)TiO3 Nanocrystals in the Superparaelectric Limit
Abstract Nanodielectrics is an emerging field with applications in capacitors, gate dielectrics, energy storage, alternatives to Li‐ion batteries, and frequency modulation in communications devices. Self‐assembly of high k dielectric nanoparticles is a highly attractive means to produce nanostructured films with impro…
Dynamical transitions and sliding friction of the phase-field-crystal model with pinning
We study the nonlinear driven response and sliding friction behavior of the phase-field-crystal (PFC) model with pinning including both thermal fluctuations and inertial effects. The model provides a continuous description of adsorbed layers on a substrate under the action of an external driving force at finite temper…
On Using Magnetic and optical methods to determine the size and characteristics of nanoparticles embedded in oxide semiconductors
Films of oxides doped with transition metals are frequently believed to have magnetic inclusions. Magnetic methods to determine the amount of nanophases and their magnetic characteristics are described. The amount of the sample that is paramagnetic may also be measured. Optical methods are described and shown to be ve…