Materials Literature
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Superconductivity in the potassium osmium oxide KOs2O6 crystallizing in the beta-pyrochlore structure is studied by means of electrical resistivity, magnetic susceptibility and specific heat. It is the second superconductor in the family of pyrochlore oxides, following the alfa-type pyrochlore oxide Cd2Re2O7 which is…
Contrasting views: Entrapment of a paramagnetic shift reagent for water protons inside liposomes dramatically improves the sensitivity of chemical exchange saturation transfer agents. The chemical shift of the water entrapped within the liposomes, relative to bulk water, depends upon the nature and concentration of th…
We present results of molecular simulations that predict the phases formed by self-assembly of nanorods functionalized by a polymer "tether." Microphase separation of the immiscible tethers and rods coupled with the liquid crystal ordering of the rods induces the formation of a cubic phase, a smectic C phase, a tetrag…
The motion of molecules on solid surfaces is of interest for technological applications, but it is also a theoretical challenge. We study the deterministic and thermal diffusive dynamics of a dimer moving on a periodic substrate. The deterministic motion of the dimer displays strongly nonlinear features and chaotic be…
A novel method is developed to enable the formation, positioning and patterning of individual metal nano-clusters with controllable and monodispersed sizes down to 1-2 nm-scale. Among wide range of potential applications, the nanoparticle arrays are used for deterministic synthesis of monodispersed single walled carbo…
We have performed a detailed study of the conductance characteristics obtained by point contact junctions realized between a normal Pt/Ir tip and syntered RuSr2GdCu2O8 (Ru-1212) samples. Indeed, this compound is subject of great interest due to the coexistence of both magnetic order and bulk superconductivity. In our…
A magnetoelectric (ME) laminate composite consisting of a symmetric longitudinally poled piezoelectric Pb(Mg1∕3Nb2∕3)O3–PbTiO3 crystal and two longitudinally magnetized magnetostrictive Tb1−xDyxFe2 layers has been developed that has a notably superior ME voltage coefficient, relative to previous laminate configuration…
Abstract A multiple aromatic ether linked phthalonitrile was synthesized and characterized. The oligomeric phthalonitrile monomer was prepared from the reaction of an excess amount of bisphenol A with 4,4′‐difluorobenzophenone in the presence of K 2 CO 3 as the base in an N,N ‐dimethylformamide/toluene solvent mixture…
Two different silver colloids were prepared by chemical reduction of silver nitrate with trisodium citrate and hydroxylamine hydrochloride to compare their characteristics in relation to their possible use in surface-enhanced Raman scattering (SERS) spectroscopy. The morphology and plasmon resonance of the single nano…
We present calculations of the lattice thermal conductivity of silicon that incorporate several commonly used empirical models of the interatomic potential. Second- and third-order force constants obtained from these potentials are used as inputs to an exact iterative solution of the inelastic phonon Boltzmann equatio…
Abstract Summary: The average lateral dimensions of cellulose microfibrils in paper sheets can be determined from the width of X‐ray Bragg peaks at half the maximum height. The method assumes it is the finite size of the crystallite which is the main contributor to peak broadening in the directions orthogonal to the l…
Anodization of titanium in a fluorinated dimethyl sulfoxide (DMSO) and ethanol mixture electrolyte is investigated. The prepared anodic film has a highly ordered nanotube-array surface architecture. Using a 20 V anodization potential (vs Pt) nanotube arrays having an inner diameter of 60 nm and 40 nm wall thickness ar…
We survey results of computer simulations for the structure and dynamics of supercooled polymer melts and films. Our survey is mainly concerned with features of a coarse grained polymer model—a bead–spring model—in the temperature regime above the critical glass temperature T c of the ideal mode-coupling theory (MCT).…
Here we investigate the kinetics of water-assisted CVD (henceforth denoted as supergrowth CVD) by a quantitative time-evolution analysis based on a simple growth model. We found that the supergrowth can be well described by a model where the dynamics of the catalyst activity is treated similar to radioactive decay. An…
A simple, chip-based implementation of a double-beam interferometer that can separate biomolecules based on size and that can compensate for changes in matrix composition is introduced. The interferometric biosensor uses a double-layer of porous Si comprised of a top layer with large pores and a bottom layer with smal…
Positively charged nanosheets with a lateral dimension of micrometers have been synthesized by directly delaminating a well-crystallized Mg−Al layered double hydroxide (LDH) in the nitrate form. The action of formamide on LDH crystals 10 μm in size led to a transparent solution. X-ray diffraction measurement on a glue…
Abstract The galvanic replacement reaction between a Ag template and HAuCl 4 in an aqueous solution transforms 30–200 nm Ag nanocubes into Au nanoboxes and nanocages (nanoboxes with porous walls). By controlling the molar ratio of Ag to HAuCl 4 , the extinction peak of resultant structures can be continuously tuned fr…
Neutron diffraction studies confirm that La2NiMnO6 is ferromagnetic with moments on Ni and Mn indicating NiII and MnIV (small and large spheres, respectively, in Figure). Electrical resistivity measurements show semiconducting behavior with a room temperature conductivity of ∼102 Ω cm and very high resistivity at low…
We derive a microscopic equation of motion for the dynamical orientational correlators of molecular crystals. Our approach is based upon mode coupling theory. Compared to liquids we find four main differences: (i) the memory kernel contains Umklapp processes if the total momentum of two orientational modes is outside…
The structures of the cubic ${\ensuremath{\alpha}}^{\ensuremath{'}}\text{\ensuremath{-}}{\mathrm{Al}}_{71.7}{\mathrm{Si}}_{7}{\mathrm{Cu}}_{3.8}{\mathrm{Fe}}_{17.5}$ and $\ensuremath{\alpha}\text{\ensuremath{-}}{\mathrm{Al}}_{55}{\mathrm{Si}}_{7}{\mathrm{Cu}}_{25.5}{\mathrm{Fe}}_{12.5}$ phases, $1∕1$ approximants of $…