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Microrheology of cross-linked polyacrylamide networks

Bivash Dasgupta、David A. Weitz2005-02-24Physical Review E

Experiments investigating the local viscoelastic properties of a chemically cross-linked polymer are performed on polyacrylamide solutions in the sol and the gel regimes using polystyrene beads of varying sizes and surface chemistry as probes. The thermal motions of the probes are measured to obtain the elastic and vi…

Material Dynamics and PropertiesSurfactants and Colloidal SystemsRheology and Fluid Dynamics Studies

A phase field formulation of the Willmore problem

Qiang Du、Chun Liu、Rolf Ryham 等 4 位作者2005-02-24Nonlinearity

In this paper, we demonstrate, through asymptotic expansions, the convergence of a phase field formulation to model surfaces minimizing the mean curvature energy with volume and surface area constraints. Under the assumption of the existence of a smooth limiting surface, it is shown that the interface of a phase field…

Solidification and crystal growth phenomenaAdvanced Mathematical Modeling in EngineeringFluid Dynamics and Thin Films

Processing of Nickel–Zinc Ferrites Via the Citrate Precursor Route for High‐Frequency Applications

Anjali Verma、D. C. Dube2005-02-24Journal of the American Ceramic Society

Nickel–zinc ferrites of various compositions, Ni 1− x Zn x Fe 2 O 4 where x =0.2, 0.4, 0.5, and 0.6 investigated in the present work, have been prepared by the citrate precursor method. The complex permittivity (∈′− j ∈″) and permeability (μ′− j μ″) of the ferrites were measured at X‐band (8–12 GHz) microwave frequenc…

Multiferroics and related materialsMagnetic Properties and Synthesis of FerritesElectromagnetic wave absorption materials

Tailoring Fe/Ag Superparamagnetic Composites by Multilayer Deposition

J. Balogh、D. Kaptás、L. F. Kiss 等 10 位作者2005-02-24arXiv

The magnetic properties of Fe/Ag granular multilayers were examined by SQUID magnetization and Mossbauer spectroscopy measurements. Very thin (0.2 nm) discontinuous Fe layers show superparamagnetic properties that can be tailored by the thickness of both the magnetic and the spacer layers. The role of magnetic interac…

Materials Science

Point defect dynamics in bcc metals

Jörg Rottler、David J. Srolovitz、Roberto Car2005-02-24Physical Review B

We present an analysis of the time evolution of self-interstitial atom and vacancy (point defect) populations in pure bcc metals under constant irradiation flux conditions. Mean-field rate equations are developed in parallel to a kinetic Monte Carlo (kMC) model. When only considering the elementary processes of defect…

Fusion materials and technologiesNuclear Materials and PropertiesIon-surface interactions and analysis

Thermal conduction of carbon nanotubes using molecular dynamics

Zhenhua Yao、Jian‐Sheng Wang、Baowen Li 等 4 位作者2005-02-24Physical Review B

The heat flux autocorrelation functions of carbon nanotubes (CNT's) with different radii and lengths are calculated using equilibrium molecular dynamics with periodic boundary conditions. The thermal conductance of CNT's is also calculated using the Green-Kubo formula from linear response theory. By pointing out an am…

Carbon Nanotubes in CompositesGraphene research and applicationsThermal properties of materials

Nanoparticle size distribution estimation by full-pattern powder diffraction analysis

A. Cervellino、C. Giannini、A. Guagliardi 等 4 位作者2005-02-24arXiv

The increasing scientific and technological interest in nanoparticles has raised the need for fast, efficient and precise characterization techniques. Powder diffraction is a very efficient experimental method, as it is straightforward and non-destructive. However, its use for extracting information regarding very sma…

Materials Science

Lifetime Widths of Surface States on Magnetic Lanthanide Metals

A. Bauer、D. Wegner、G. Kaindl2005-02-24arXiv

Low-temperature scanning tunneling spectroscopy is used to study electronic structure and dynamics of d-like surface states of trivalent lanthanide metals from La to Lu. The magnetic exchange splitting of these states is found to scale with the 4f spin multiplied by an effective exchange-coupling constant that increas…

Materials Sciencecond-mat.other

Response to Comment on "Epitaxial BiFeO 3 Multiferroic Thin Film Heterostructures"

Junling Wang、A. Schöll、Haimei Zheng 等 14 位作者2005-02-24Science

In this response, we report the results of additional experiments that bear on the issues raised in the comment by Eerenstein et al . ([ 1 ][1]) and suggest some additional possible reasons for the results they have obtained. In Wang et al . ([ 2 ][2]), we reported on the ferroelectric and magnetic

Ferroelectric and Piezoelectric MaterialsMultiferroics and related materials

Generalized and Facile Synthesis Approach to N-Doped Highly Graphitic Mesoporous Carbon Materials

Yongde Xia、Robert Mokaya2005-02-24Chemistry of Materials

The synthesis and characterization of porous graphitic carbon materials via chemical vapor deposition (CVD) using various mesoporous silicas including SBA-12, SBA-15, MCM-48, MCM-41, and HMS as solid templates is presented. The use of acetonitrile as carbon precursor generates N-doped carbon (CNx type) materials with…

Supercapacitor Materials and FabricationZeolite Catalysis and SynthesisMesoporous Materials and Catalysis

Radiation‐induced grafting of glycidyl methacrylate onto high‐density polyethylene (HDPE) and radiation lamination of HDPE

Zhirong Li、Huiliang Wang2005-02-23Journal of Applied Polymer Science

Abstract Radiation‐induced grafting of glycidyl meth‐acrylate (GMA) onto high‐density polyethylene (HDPE) and the radiation lamination of HDPE by bulk grafting of GMA were reported. The effects of irradiation dose, monomer concentration, and atmosphere on grafting were investigated. The extent of grafting initially in…

Polymer Nanocomposites and PropertiesFiber-reinforced polymer compositesPolymer Nanocomposite Synthesis and Irradiation

Synthèse et étude cristallographique d’un nouveau composé de coordination asymétrique de l'uranium(IV) lié à deux ligands du type polytungstate [(H3SbIIIW17O59)UIV(HW5O18)]11–

Yves Jeannin2005-02-23Comptes Rendus Chimie

L’hétéropolytungstate [(H 3 Sb III W 17 O 59 )U IV (HW 5 O 18 )] 11– a été préparé à partir de tungstate de sodium et, soit de fluorure, soit de chlorure d’uranium(IV). L’étude cristallographique montre que l’atome central d’uranium(IV) est au centre d’un antiprisme d’Archimède. Il est coordonné par quatre atomes d’ox…

Metal-Organic Frameworks: Synthesis and ApplicationsRadioactive element chemistry and processingPolyoxometalates: Synthesis and Applications

Selenium-Containing π-Conjugated Compounds for Electronic Molecular Materials

Kazuo Takimiya、Tetsuo Otsubo2005-02-23Phosphorus, sulfur, and silicon and the related elements

Novel selenium-containing π-conjugated compounds have been studied for the development of organic metals, superconductors, and field-effect-transistors. Methylenedithiotetraselenafulvalene (MDT-TSF) and its related electron donors are effectively synthesized by the recently developed synthetic method consisting of the…

Organic Electronics and PhotovoltaicsPerovskite Materials and ApplicationsOrganic and Molecular Conductors Research

Two-length-scale behavior near the ferroelectric phase transition ofSn2P2S6

J. Hlinka、R. Currat、M. de Boissieu 等 5 位作者2005-02-23Physical Review B

Synchrotron x-ray diffraction studies of a ${\mathrm{Sn}}_{2}{\mathrm{P}}_{2}{\mathrm{S}}_{6}$ crystal near the continuous ferroelectric phase transition have revealed that the critical scattering contains two independent components. The extraneous narrow component appears to originate from the strained, near-surface…

Glass properties and applicationsCrystal Structures and PropertiesSolid-state spectroscopy and crystallography

Heterogeneous polyamide 66/syndiotactic polystyrene blends: Phase structure and thermal and mechanical properties

Jan Kolařı́k、Luca Fambri、Miroslav Šlouf 等 4 位作者2005-02-23Journal of Applied Polymer Science

Abstract The structural and physical properties of polyamide 66 (PA66)/syndiotactic polystyrene (sPS) blends were studied with electron microscopy, wide‐angle X‐ray scattering (WAXS), differential scanning calorimetry (DSC), dynamic mechanical thermal analysis, and tensile creep, stress–strain, and impact measurements…

Polymer crystallization and propertiesPolymer Nanocomposites and Propertiesbiodegradable polymer synthesis and properties

Multitechnique characterization of thin films of immiscible polymer systems: PS–b‐PMMA diblock copolymers and PS–PMMA symmetric blends

Lekshmi Kailas、Bernard Nysten、Jean‐Nicolas Audinot 等 5 位作者2005-02-23Surface and Interface Analysis

Abstract Immiscible polymer systems are known to form various kinds of phase‐separated structures capable of producing self‐assembled patterns at the surface. In this study, different surface characterization methods were utilized to study the surface morphology and composition produced after annealing thin polymer fi…

Polymer Surface Interaction StudiesBlock Copolymer Self-AssemblyNanopore and Nanochannel Transport Studies

Effect of “glutaraldehyde” functionality on network formation in poly(vinyl alcohol) membranes

Helen K. Purss、Greg G. Qiao、David H. Solomon2005-02-23Journal of Applied Polymer Science

Abstract The use of higher‐functionality oligomers of glutaraldehyde on network formation was investigated and compared with glutaraldehyde monomer in step‐growth reactions. The effect of using such oligomers in network formation depends on the stoichiometry, which alters either the branching or both the branching and…

Microfluidic and Capillary Electrophoresis Applicationsbiodegradable polymer synthesis and propertiesAnalytical Chemistry and Sensors

Precursor Routes to Semiconductor Quantum Dots

Paul O’Brien、Mohammad Azad Malik、Neerish Revaprasadu2005-02-23Phosphorus, sulfur, and silicon and the related elements

Quantum Dots are unique for two very important reasons both of which can potentially be commercially exploited: •The electronic and optical properties of Quantum Dots are dependent on the particle size.•As the Quantum Dot nanoparticle becomes smaller the ratio of the number of surface atoms to those in the interior in…

Quantum Dots Synthesis And PropertiesChalcogenide Semiconductor Thin FilmsNanocluster Synthesis and Applications

Periodic Hexagonal Mesostructured Chalcogenides Based on Platinum and [SnSe4]4- and [SnTe4]4- Precursors. Solvent Dependence of Nanopore and Wall Organization

Pantelis N. Trikalitis、T. Bakas、Mercouri G. Kanatzidis2005-02-23Journal of the American Chemical Society

Mesostructured chalcogenide-based materials with long-range order and semiconducting properties can be prepared using suitable molecular building blocks, linkage metal ions and surfactant molecules. In this paper we present surfactant templated, open framework platinum tin selenide and telluride materials assembled us…

Quantum Dots Synthesis And PropertiesChalcogenide Semiconductor Thin FilmsCrystal Structures and Properties