Chong Hua、Songming Peng、Chang‐Ming Dong2008-08-29Macromolecules
A new class of linear-dendron-like poly(ε-caprolactone)- b -poly(ethylene oxide) (PCL- b -PEO) copolymers with unsymmetrical topology was synthesized via controlled ring-opening polymerization (ROP) of ε-caprolactone (CL) followed by a click conjugation with azide-terminated PEO (PEO-N 3 ). The dendron-like PCL termin…
Advanced Polymer Synthesis and CharacterizationClick Chemistry and ApplicationsDendrimers and Hyperbranched Polymers
Tatyana Bendikov、Aharon Rabinkov、Tanya Karakouz 等 5 位作者2008-08-29Analytical Chemistry
Discontinuous, island-type gold films (typically < or = 10 nm nominal thickness) prepared by evaporation of the metal on transparent substrates show a localized surface plasmon resonance (LSPR) extinction in the visible-to-NIR range and can be used as optical transducers for monitoring local refractive index change. S…
Gold and Silver Nanoparticles Synthesis and ApplicationsAdvanced biosensing and bioanalysis techniquesPlasmonic and Surface Plasmon Research
Emily Cottam、D.W.L. Hukins、Kenneth Lee 等 5 位作者2008-08-29Medical Engineering & Physics
This paper investigates the effect of sterilisation by gamma irradiation (dose 2.5Mrad) on the following properties of polycaprolactone (PCL): (1) degradation rate (catalysed by lipase), (2) mechanical properties, (3) the ability of cells to attach and subsequently grow on its surface. Gel permeation chromatography (G…
biodegradable polymer synthesis and propertiesElectrospun Nanofibers in Biomedical ApplicationsPolymer Nanocomposite Synthesis and Irradiation
J. T. Haraldsen、M. B. Stone、M. D. Lumsden 等 8 位作者2008-08-29arXiv
We report inelastic and elastic neutron scattering, magnetic susceptibility, and heat capacity measurements of polycrystalline sodium ruthenate (Na$_3$RuO$_4$). Previous work suggests this material consists of isolated tetramers of $S=3/2$ Ru$^{5+}$ ions in a so-called "lozenge" configuration. Using a Heisenberg antif…
Materials Science
Takashi Kajiwara、Motohiro Nakano、Shinya Takaishi 等 4 位作者2008-08-29Inorganic Chemistry
Tb (III)-Cu (II)-based single-molecule magnet (SMM) and non-SMM were synthesized to investigate the relationship between magnetic anisotropy and the symmetry of the ligand field by the reaction of [TbCu( o-vanilate) 2(NO 3) 3] with methoxypropylamine (MeOC 3H 6NH 2, 1) or ethoxyethylamine (EtOC 2H 4NH 2, 2). In both c…
Magnetism in coordination complexesPorphyrin and Phthalocyanine ChemistryLanthanide and Transition Metal Complexes
Weifeng Wei、Xinwei Cui、Weixing Chen 等 4 位作者2008-08-29The Journal of Physical Chemistry C
The crystal structure of anodically electrodeposited MnO 2 nanocrystals can be manipulated by introducing complexing agents in the electrodeposition solutions. MnO 2 nanocrystals with three types of crystal structures were observed: hexagonal ε-MnO 2 (complex-free), defective rock salt MnO 2 (ethylenediaminetetraaceti…
Advancements in Battery MaterialsSupercapacitor Materials and FabricationAdvanced battery technologies research
Theodore Lazarides、Daniel Sykes、Stephen Faulkner 等 5 位作者2008-08-29Chemistry - A European Journal
We have used time-resolved luminescence methods to study rates of photoinduced energy transfer (PEnT) from [M(bipy)3]2+ (M=Ru, Os) chromophores to Ln(III) ions with low-energy f-f states (Ln=Yb, Nd, Er) in d-f dyads in which the metal fragments are separated by a saturated -CH2CH2- spacer, a p-C6H4 spacer, or a p-(C6H…
Photochemistry and Electron Transfer StudiesLuminescence and Fluorescent MaterialsLanthanide and Transition Metal Complexes
Renguo Xie、Xiaogang Peng2008-08-29Angewandte Chemie International Edition
Paint by number: High-quality InAs quantum dots (QDs) for near-IR fluorescence (see picture) were synthesized by exploiting interparticle diffusion and self-focusing instead of using the traditional focusing of size distribution. InAs/CdSe core–shell QDs were grown and analyzed by a technique combining TEM and element…
Quantum Dots Synthesis And PropertiesChalcogenide Semiconductor Thin FilmsAdvanced Semiconductor Detectors and Materials
Mirko Arnold、Thorsten M. Gesing、Julia Martynczuk 等 4 位作者2008-08-29Chemistry of Materials
The mixed ionic-electronic conductor (MIEC) (Ba 0.5 Sr 0.5 )(Co 0.8 Fe 0.2 )O 3−δ (BSCF) is a renowned material with applications in membrane reactors and as cathodes in solid-oxide fuel cells. Despite BSCF’s large oxygen permeabilities, long-time phase instability at intermediate temperatures has been reported. Howev…
Advancements in Solid Oxide Fuel CellsMagnetic and transport properties of perovskites and related materialsElectronic and Structural Properties of Oxides
Zhongqing Wei、Daniel E. Barlow、Paul E. Sheehan2008-08-29Nano Letters
Charged molecular templates were created to direct the placement of single-layer graphite oxide (GO) sheets. The distribution of the GO sheets depended on the surface functionalization, background passivation, pH, and deposition time. Electrostatic attraction guides the templating of the GO sheets and, consequently, t…
Graphene research and applications2D Materials and ApplicationsMolecular Junctions and Nanostructures
Olivier Roubeau、Rodolphe Clérac2008-08-29European Journal of Inorganic Chemistry
Abstract The synthesis of transition‐metal high‐spin complexes and of infinite coordination networks of these high‐spin carriers now represents a recognized subdiscipline of coordination chemistry. This new research trend has been particularly encouraged by the discoveries that molecular and one‐dimensional coordinati…
Metal-Organic Frameworks: Synthesis and ApplicationsMagnetism in coordination complexesLanthanide and Transition Metal Complexes
Vladimir P. Torchilin2008-08-29Expert Opinion on Drug Delivery
BACKGROUND: Liposomes, phospholipids, nanosized bubbles with a bilayered membrane structure, have drawn a lot of interest as pharmaceutical carriers for drugs and genes. In particular, liposomes are widely used for drug delivery into tumors. OBJECTIVE: In many cases, to enhance the efficacy of the liposomal drugs, dru…
Nanoparticle-Based Drug DeliveryRNA Interference and Gene DeliveryUltrasound and Hyperthermia Applications
Jiaguang Han、Akhlesh Lakhtakia、Cheng-Wei Qiu2008-08-29Optics Express
We studied a metasurface constituted as a periodic array of semiconductor split-ring resonators. The resonance frequencies of the metasurface excited by normally incident light were found to be continuously tunable in the terahertz regime through an external magnetostatic field of suitable orientation. As such metasur…
Metamaterials and Metasurfaces ApplicationsPlasmonic and Surface Plasmon ResearchAdvanced Antenna and Metasurface Technologies
H. Luetkens、H.‐H. Klauß、R. Khasanov 等 13 位作者2008-08-29Physical Review Letters
We present zero field and transverse field muon spin relaxation experiments on the recently discovered Fe-based superconductor ${\mathrm{LaFeAsO}}_{1\ensuremath{-}x}{\mathrm{F}}_{x}$ ($x=0.075$ and $x=0.1$). The temperature dependence of the deduced superfluid density is consistent with a BCS $s$-wave or a dirty $d$-w…
Rare-earth and actinide compoundsCorporate Taxation and AvoidanceIron-based superconductors research
Wendy J. Shaw、John C. Linehan、Nathaniel K. Szymczak 等 8 位作者2008-08-29Angewandte Chemie International Edition
Looking to the future: The decomposition in solution of a potential hydrogen-storage compound, ammonia borane (AB), was investigated by in situ 11B NMR spectroscopy and ex situ 15N NMR spectroscopy. The reaction was found to be second order in AB with an activation barrier of (25±2) kcal mol−1. The second-order kineti…
Hydrogen Storage and MaterialsAmmonia Synthesis and Nitrogen ReductionChemical Synthesis and Characterization
Fudong Wang、Rui Tang、William E. Buhro2008-08-29Nano Letters
Tri-n-octylphosphine oxide (TOPO) is a commonly used solvent for nanocrystal synthesis. Commercial TOPO samples contain varying amounts of phosphorus-containing impurities, some of which significantly influence nanocrystal growth. Consequently, nanocrystal syntheses often give irreproducible results with different bat…
ZnO doping and propertiesQuantum Dots Synthesis And PropertiesChalcogenide Semiconductor Thin Films
J. L. Alonso、Xavier Andrade、Pablo Echenique 等 6 位作者2008-08-29arXiv
A new "on the fly" method to perform Born-Oppenheimer ab initio molecular dynamics (AIMD) is presented. Inspired by Ehrenfest dynamics in time-dependent density functional theory, the electronic orbitals are evolved by a Schroedinger-like equation, where the orbital time derivative is multiplied by a parameter. This p…
Materials Sciencephysics.comp-ph
E. Veena Gopalan、K A Malini、S. Saravanan 等 6 位作者2008-08-29Journal of Physics D Applied Physics
Nanoparticles of manganese ferrite were prepared by the chemical co-precipitation technique. The dielectric parameters, namely, real and imaginary dielectric permittivity (ε' and ε''), ac conductivity (σ ac ) and dielectric loss tangent (tanδ), were measured in the frequency range of 100 kHz–8 MHz at different tempera…
Multiferroics and related materialsMagnetic Properties and Synthesis of FerritesMagneto-Optical Properties and Applications
Si‐Fu Tang、A. Babai、Anja‐Verena Mudring2008-08-29Angewandte Chemie International Edition
Low melting, highly luminescent: [C3mim][Eu(Tf2N)4] (1), [C4mim][Eu(Tf2N)4], and [C4mpyr]2[Eu(Tf2N)5] are the first lanthanide ionic liquids that do not need stabilization of the liquid state by neutral coligands. They show excellent photophysical properties, such as long lifetimes of luminescence at large EuIII conce…
Organometallic Complex Synthesis and CatalysisIonic liquids properties and applicationsLanthanide and Transition Metal Complexes
J. B. Pendry2008-08-29Science
Time reversal and negative refraction have been shown to be intimately linked processes. We propose a scheme that exploits transitions between positive and negative frequencies to mimic negative refraction at an interface and hence to make a negatively refracting lens. The theory applies equally to electromagnetic and…
Metamaterials and Metasurfaces ApplicationsPhotonic Crystals and ApplicationsMicrowave Imaging and Scattering Analysis