Emma Engström、Ilia Rodushkin、Douglas C. Baxter 等 4 位作者2005-11-25Analytical Chemistry
A procedure is described for accurate Si isotope ratio measurements by multicollector inductively coupled plasma mass spectrometry (MC-ICPMS). Dissolved silicon was preconcentrated and separated from other elements present in natural surface waters using anion-exchange chromatography. The optimized procedure provides…
Geochemistry and Elemental AnalysisDiatoms and Algae ResearchSilicon Effects in Agriculture
Helén Jansson、R.G. Bergman、Jan Swenson2005-11-25The Journal of Physical Chemistry B
We present results obtained by dielectric spectroscopy in wide frequency (10(-2)-10(9) Hz) and temperature ranges on human hemoglobin in the three different solvents water, glycerol, and methanol, at a solvent level of 0.8 g of solvent/g of protein. In this broad frequency region, there are motions on several time-sca…
Protein Structure and DynamicsMaterial Dynamics and PropertiesSpectroscopy and Quantum Chemical Studies
M. Scott Shell、Pablo G. Debenedetti、Frank H. Stillinger2005-11-25Journal of Physics Condensed Matter
We use a recently derived reformulation of the diffusion constant (Stillinger and Debenedetti 2005 J. Phys. Chem. B 109 6604) to investigate heterogeneous dynamics and non-Gaussian diffusion in a binary Lennard-Jones mixture. Our work focuses on the joint probability distribution of particles with velocity v 0 at time…
Phase Equilibria and ThermodynamicsMaterial Dynamics and PropertiesThermodynamic properties of mixtures
Zhivko Zhelev、Rumiana Bakalova、Hideki Ohba 等 6 位作者2005-11-25Analytical Chemistry
In the present study, we describe the synthesis of highly luminescent uncoated water-soluble CdSe quantum dots (QDs) possessing the following characteristics: approximately 2 nm in diameter, with very good size distribution (in 95% homodispersed) accompanied by a broad-band photoluminescent spectrum. The synthetic pro…
Advanced biosensing and bioanalysis techniquesQuantum Dots Synthesis And PropertiesNanocluster Synthesis and Applications
Qingyi Lu、Feng Gao、Sridhar Komarneni2005-11-25Chemistry of Materials
Elemental selenium nanobelts have been synthesized for the first time by a novel and mild solution method. The synthetic reaction was carried out with cellulose as both reducing and morphology-directing agents in solution under simple hydrothermal conditions at low temperature, which is quite different from the therma…
Quantum Dots Synthesis And PropertiesSelenium in Biological SystemsCarbon and Quantum Dots Applications
Sergey G. Makarov、Christian Litwinski、Eugeny Ermilov 等 6 位作者2005-11-25Chemistry - A European Journal
Metal-free mononuclear, dinuclear and trinuclear phthalocyanines were prepared by a mixed cyclotetramerisation of a 1,2,4,5-tetracyanobenzene derivative and 4,5-bis(2,6-dimethylphenoxy)phthalonitrile. For the first time, a pi-electron-conjugated trinuclear phthalocyanine was synthesised with phthalocyanine units conne…
Photosynthetic Processes and MechanismsPorphyrin and Phthalocyanine ChemistrySurface Chemistry and Catalysis
Djamal Zerrouki、Benjamin Rotenberg、Sébastien Abramson 等 8 位作者2005-11-25Langmuir
We describe a six-step method for making colloidal clusters of 2, 3, or 4 silica particles with a radius of 1.2 microm. This method, originally described by Manoharan et al. (Manoharan, V. N.; Elsesser, M. T.; Pine, D. J. Science 2003, 301, 483), is based on the encapsulation of silica spheres in emulsion droplets. Th…
Photonic Crystals and ApplicationsMesoporous Materials and CatalysisPickering emulsions and particle stabilization
Alexandra S. Angelatos、Kiyofumi Katagiri、Frank Caruso2005-11-25Soft Matter
This paper provides an overview of our recent work in the area of bioinspired colloidal particles. We highlight how modifying the basic polyelectrolyte multilayer shell with materials such as light-absorbing gold nanoparticles, lipid bilayer membranes, and targeting ligands can functionalize colloids prepared the laye…
Nanoparticle-Based Drug DeliveryGold and Silver Nanoparticles Synthesis and ApplicationsPolymer Surface Interaction Studies
Rajendra R. Zope、Brett I. Dunlap2005-11-25arXiv
Our recent formulation of the analytic and variational Slater-Roothaan (SR) method, which uses Gaussian basis sets to variationally express the molecular orbitals, electron density and the one body effective potential of density functional theory, is reviewed. Variational fitting can be extended to the resolution of i…
Materials Sciencecond-mat.otherChemical Physics
Thomas Cardinaels、Kris Driesen、Tatjana N. Parac‐Vogt 等 8 位作者2005-11-25Chemistry of Materials
Liquid-crystalline complexes of rhenium(I), yttrium(III), lanthanum(III), neodymium(III), samarium(III), europium(III), erbium(III), and ytterbium(III) were obtained by coupling mesogenic 4-cyanobiphenyl groups via a long alkyl spacer to a substituted imidazo[4,5-f]-1,10-phenanthroline, which acts as the coordinating…
Supramolecular Chemistry and ComplexesMagnetism in coordination complexesLanthanide and Transition Metal Complexes
Gul Rahman、Dirk M. Guldi、Stéphane Campidelli 等 4 位作者2005-11-25Journal of Materials Chemistry
Electronically interacting single wall carbon nanotube–porphyrin nanohybrids were confirmed by microscopic and spectroscopic means to exhibit charge transfer features.
Carbon Nanotubes in CompositesGraphene research and applicationsElectrochemical Analysis and Applications
C. Goldmann、D. J. Gundlach、B. Batlogg2005-11-25arXiv
We report on the generation of a discrete trap state during negative gate bias stress in pentacene single crystal "flip-crystal" field-effect transistors with a SiO2 gate dielectric. Trap densities of up to 2*10^12 cm^-2 were created in the experiments. Trap formation and trap relaxation are distinctly different above…
Materials ScienceSoft Condensed Matter
Nicole E. Papen‐Botterhuis、Qianyao Sun、Pieter C. M. M. Magusin 等 5 位作者2005-11-25Chemistry - A European Journal
Herein we report the synthesis and characterization of hollow silica spheres with a narrow size distribution, uniform wall thickness, and a worm-like pore structure. The formation of these spheres was monitored by confocal laser scanning microscopy and dynamic light scattering. A model for the molecular build-up of th…
Zeolite Catalysis and SynthesisMesoporous Materials and CatalysisDiatoms and Algae Research
Choonsup Lee、Sam Y. Bae、Sohrab Mobasser 等 4 位作者2005-11-25Nano Letters
We have developed a new technique to fabricate an antireflection surface using silicon nanotips for use on a micro Sun sensor for Mars rovers. We have achieved randomly distributed nanotips of radii spanning from 20 to 100 nm and aspect ratio of approximately 200 using a two-step dry etching process. The 30 degrees sp…
Photonic and Optical DevicesNanowire Synthesis and ApplicationsOptical Coatings and Gratings
Vishwesha Guttal、David Stroud2005-11-25arXiv
We calculate the effective resistivity of a macroscopically disordered two dimensional conductor consisting of two components in a perpendicular magnetic field. When two components have equal area fractions, we use a duality theorem to show that the magnetoresistance is non-saturating and at high fields varies exactly…
cond-mat.dis-nnMaterials Science
John Mack、Yoshiaki Asano、Nagao Kobayashi 等 4 位作者2005-11-25Journal of the American Chemical Society
The first magnetic circular dichroism (MCD) spectra are reported for tetraphenyltetraacenaphthoporphyrin (TPTANP). The impact on the electronic structure of steric interactions between the fused acenaphthalene rings and the meso-tetraphenyl substituents is explored based on an analysis of the optical spectra of the Zn…
Photosynthetic Processes and MechanismsPorphyrin and Phthalocyanine ChemistryMetal-Catalyzed Oxygenation Mechanisms
Uwe Birkenheuer、Peter Fulde、Hermann Stoll2005-11-25arXiv
We present a simplified computational scheme in order to calculate the effects of electron correlations on the energy bands of diamond and silicon. By adopting a quasiparticle picture we compute first the relaxation and polarization effects around an electron set into a conduction band Wannier orbital. This is done by…
Materials Science
L. E Hueso、L. Granja、P. Levy 等 4 位作者2005-11-25arXiv
We report magnetic and electrical transport studies of an epitaxially grown trilayer thin film structure comprising La0.59Ca0.41MnO3 sandwiched between La0.67Ca0.33MnO3 electrodes. Since La0.59Ca0.41MnO3 lies at the edge of the thin film ferromagnetic metallic phase field, phase separation effects are expected. These…
Materials Science
Andrew N. Norris2005-11-25arXiv
The isotropic elastic moduli closest to a given anisotropic elasticity tensor are defined using three definitions of elastic distance, the standard Frobenius (Euclidean) norm, the Riemannian distance for tensors, and the log-Euclidean norm. The closest moduli are unique for the Riemannian and the log-Euclidean norms,…
Materials Science
Haim Diamant、Bianxiao Cui、Binhua Lin 等 4 位作者2005-11-25Journal of Physics Condensed Matter
We investigate theoretically and experimentally how the hydrodynamically correlated lateral motion of particles in a suspension confined between two surfaces is affected by the suspension concentration. Despite the long range of the correlations (decaying as 1/ r 2 with the inter-particle distance r ), the concentrati…
Material Dynamics and PropertiesGranular flow and fluidized bedsElectrostatics and Colloid Interactions