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Laser-Induced Reshaping of Metallodielectric Nanoshells under Femtosecond and Nanosecond Plasmon Resonant Illumination

Carla M. Aguirre、Cristin E. Moran、J. F. Young 等 4 位作者2004-05-01The Journal of Physical Chemistry B

Absorption of pulsed laser light energy at the plasmon resonant wavelength of silica−gold core−shell nanoparticles results in a reshaping of the nanoparticle's metal shell layer. Dramatically distinct and reproducible changes in nanoparticle morphology occur as a function of laser pulse width in the femtosecond versus…

Gold and Silver Nanoparticles Synthesis and ApplicationsNonlinear Optical Materials StudiesLaser-Ablation Synthesis of Nanoparticles

Seasonal persistence and stability of diatom communities in rivers: are there habitat specific differences?

Janne Soininen、Pertti Eloranta2004-05-01European Journal of Phycology

Epilithic, epiphytic and epipelic diatoms were sampled at four sampling stations monthly from June to October in three boreal rivers in South Finland to examine the seasonal community persistence and stability of diatom communities in three habitats. The variation of successive samples in ordination space using Non-Me…

Freshwater macroinvertebrate diversity and ecologyDiatoms and Algae ResearchAquatic Invertebrate Ecology and Behavior

Polymorphism and devitrification of nifedipine under controlled humidity: a combined FT‐Raman, IR and Raman microscopic investigation

K. L. Andrew Chan、Oliver S. Fleming、Sergei G. Kazarian 等 6 位作者2004-05-01Journal of Raman Spectroscopy

Abstract FT‐Raman and FT‐IR spectroscopy and Raman microscopy were employed to identify the structural characteristics of one amorphous and three crystalline phases of nifedipine, a common antihypertension drug of the 1,4‐dihydropyridine family. A significant fraction of the nifedipine molecules in the glass are found…

Crystallography and molecular interactionsNonlinear Optical Materials ResearchSpectroscopy Techniques in Biomedical and Chemical Research

Immiscible Poly(L‐lactide)/Poly(ε‐caprolactone) Blends: Influence of the Addition of a Poly(L‐lactide)‐Poly(oxyethylene) Block Copolymer on Thermal Behavior and Morphology

Giovanni Maglio、Mario Malinconico、Anna Migliozzi 等 4 位作者2004-05-01Macromolecular Chemistry and Physics

Abstract Summary: A binary blend of poly ( L ‐lactide) (PLLA) and poly( ε ‐caprolactone) (PCL) of composition 70:30 by weight was prepared using a twin screw miniextruder and investigated by differential scanning calorimetry (DSC), optical microscopy and scanning electron microscopy (SEM). Ternary 70:30:2 blends were…

Polymer crystallization and propertiesbiodegradable polymer synthesis and propertiesAdditive Manufacturing and 3D Printing Technologies

Effect of Composition Distribution on Microphase-Separated Structure from BAB Triblock Copolymers

Atsushi Noro、M. Iinuma、Jirô Suzuki 等 5 位作者2004-05-01Macromolecules

The effects of composition distribution on microphase-separated structures formed by monodisperse BAB triblock copolymers were investigated. Monodisperse nine parent BAB triblock copolymers consisting of polystyrene for A and poly(2-vinylpyridine) for B were prepared by anionic living polymerization. These nine copoly…

Advanced Polymer Synthesis and CharacterizationPolymer Surface Interaction StudiesBlock Copolymer Self-Assembly

Strain-Induced Molecular Orientation and Crystallization in Natural and Synthetic Rubbers under Uniaxial Deformation by In-situ Synchrotron X-ray Study

Shigeyuki Toki、Igors Šics、Shaofeng Ran 等 11 位作者2004-05-01Rubber Chemistry and Technology

Abstract In-situ synchrotron wide-angle X-ray diffraction (WAXD) studies and simultaneous measurements of stress and strain during uniaxial stretching of various vulcanized rubbers were carried out (at room temperature and 0°C) to reveal the strain-induced molecular orientation and crystallization relationships. Rubbe…

Polymer crystallization and propertiesPolymer Nanocomposites and Propertiesbiodegradable polymer synthesis and properties

Metallographische Gefügeuntersuchungen von Magnesiumlegierungen / The Metallographical Examination of Magnesium Alloys

Volker Kree、Jan Bohlen、Dietmar Letzig 等 4 位作者2004-05-01Practical Metallography

Article Metallographische Gefügeuntersuchungen von Magnesiumlegierungen / The Metallographical Examination of Magnesium Alloys was published on May 1, 2004 in the journal Practical Metallography (volume 41, issue 5).

Magnesium Alloys: Properties and ApplicationsEngineering and Materials Science Studies

Intrinsic Defects in ZnO Films Grown by Molecular Beam Epitaxy

Tomohiko Tatsumi、Miki Fujita、Noriaki Kawamoto 等 5 位作者2004-05-01Japanese Journal of Applied Physics

We have investigated the intrinsic defects in ZnO films grown by molecular beam epitaxy by annealing them in O 2 and N 2 atmosphere. We found that there is a good correlation between the annealing condition and photoluminescence characteristics. The results of annealing experiments suggest that the photoluminescence a…

ZnO doping and propertiesGas Sensing Nanomaterials and SensorsGa2O3 and related materials

Photooxidation in Water by New Hybrid Molecular Photocatalysts Integrating an Organic Sensitizer with a Polyoxometalate Core

Marcella Bonchio、Mauro Carraro、Gianfranco Scorrano 等 4 位作者2004-05-01Advanced Synthesis & Catalysis

Abstract Hybrid compounds consisting of an organic sensitizer and a polyoxometalate unit were synthesized following two strategies: a) the covalent functionalization of lacunary decatungstosilicate with organosilylfulleropyrrolidines; b) the charge interaction between cationic sensitizers and the polyoxoanions, yieldi…

Polyoxometalates: Synthesis and ApplicationsChemical Synthesis and ReactionsOxidative Organic Chemistry Reactions

Ca-Mg and K-Mg mixing around non-bridging O atoms in silicate glasses: An investigation using 17 O MAS and 3QMAS NMR

Jeffrey R. Allwardt、Jonathan F. Stebbins2004-05-01American Mineralogist

In an effort to improve the physical accuracy of models of the thermodynamics of silicate melts, we describe a systematic study of the extent of modifying cation mixing, using 17 O 3QMAS NMR, in a series of Ca-Mg and K-Mg silicate glasses. The spectra for the mixed cation Ca 2-2x Mg 2x Si 2 O 6 glass show that only on…

Geological and Geochemical AnalysisMaterial Dynamics and PropertiesGlass properties and applications

Mechanical response and rheological properties of polycarbonate layered‐silicate nanocomposites

Alex J. Hsieh、Paul Moy、Frederick L. Beyer 等 7 位作者2004-05-01Polymer Engineering and Science

Abstract The effect of clay loading on the mechanical behavior and melt state linear viscoelastic properties of intercalated polycarbonate (PC) nanocomposites was investigated. At low frequencies, the linear dynamic oscillatory moduli data revealed diminished frequency dependence with increasing nanoclay loading. The…

Polymer crystallization and propertiesPolymer Nanocomposites and Propertiesbiodegradable polymer synthesis and properties

Silicoaluminum Carbonitride with Anomalously High Resistance to Oxidation and Hot Corrosion

Li Nan An、Yan Wang、Lavanya Bharadwaj 等 10 位作者2004-05-01Advanced Engineering Materials

Due to their excellent thermal and mechanical properties silicon‐based ceramics and composites are prime candidates for high temperature structural applications. In this communication the authors report for the first time that amorphous silicoaluminum carbonitride (SiAlCN) ceramics possess anomalously high resistance…

Advanced ceramic materials synthesisGlass properties and applicationsAdvanced materials and composites

In Vivo Tissue-Engineered Small-Caliber Arterial Graft Prosthesis Consisting of Autologous Tissue (Biotube)

Yasuhide Nakayama、Hatsue Ishibashi‐Ueda、Keiichi Takamizawa2004-05-01Cell Transplantation

In this study, vascular-like tubular tissues called biotubes, consisting of autologous tissues, were prepared using in vivo tissue engineering. Their mechanical properties were evaluated for application as a small-caliber artificial vascular prosthesis. The biotubes were prepared by embedding six kinds of polymeric ro…

Aortic Disease and Treatment ApproachesElectrospun Nanofibers in Biomedical ApplicationsTissue Engineering and Regenerative Medicine

Development of field emission displays

Shigeo Itoh、Mitsuru Tanaka、Takeshi Tonegawa2004-05-01Journal of Vacuum Science & Technology B Microelectronics and Nanometer Structures Processing Measurement and Phenomena

Field emission displays (FED) are drawing attention as one of the most promising flat panel displays. Currently, the development stage of Spindt-type FEDs with Mo emitter is close to an end. The monocolor Spindt-type FEDs are being supplied to the market, and the color FEDs are ready for mass production. FED is also e…

Carbon Nanotubes in CompositesGraphene research and applicationsSemiconductor materials and devices

Deformation twinning in nanocrystalline Pd

Harald Rösner、Jürgen Markmann、Jörg Weißmüller2004-05-01Philosophical Magazine Letters

Defect structures of plastically deformed nanocrystalline Pd investigated by high-resolution transmission electron microscopy are presented. Material with an average grain size of about 15 nm was prepared by inert-gas condensation, and this was plastically deformed by cold rolling up to a true strain of 0.32 at a stra…

Microstructure and mechanical propertiesMetal and Thin Film MechanicsHigh-Velocity Impact and Material Behavior

Why the fast relaxation in the picosecond to nanosecond time range can sense the glass transition

K. L. Ngai2004-05-01The Philosophical Magazine A Journal of Theoretical Experimental and Applied Physics

The fast relaxation measured by quasielastic neutron and light scattering on the picosecond to nanosecond time scales when expressed as mean square displacement as a function of temperature shows a change in slope at or near the conventional glass transition temperature in a manner like those of the enthalpy and volum…

Material Dynamics and PropertiesGlass properties and applicationsTheoretical and Computational Physics

Microstructure and Properties of an HfB2‐SiC Composite for Ultra High Temperature Applications

F. Monteverde、A. Bellosi2004-05-01Advanced Engineering Materials

An ultra‐high‐temperature ceramic (UHTC) based on HfB 2 was produced. The microstructure consisted of fine and regular diboride grains (2 μm average size), with SiC particulate distributed intergranularly, not rarely in clustered formation, and low levels of secondary phases were identified. The resulting thermo‐mecha…

Advanced ceramic materials synthesisMXene and MAX Phase MaterialsAdvanced materials and composites

High-voltage single-crystal diamond diodes

Daniel J. Twitchen、Andrew J. Whitehead、Steven E. Coe 等 7 位作者2004-05-01IEEE Transactions on Electron Devices

Demonstration of a 2.5-kV diamond diode is provided by electrical measurements using a circular gold Schottky contact, with an area >1 mm/sup 2/, on large area freestanding single-crystal diamond consisting of a thin high purity layer (1/spl times/0/sup 19/ [B]/cm/sup 3/) substrate with an ohmic back contact. The diod…

Metal and Thin Film MechanicsDiamond and Carbon-based Materials ResearchForce Microscopy Techniques and Applications

Optical switching of vanadium dioxide thin films deposited by reactive pulsed laser deposition

M. Soltani、Mohamed Chaker、E. Haddad 等 5 位作者2004-05-01Journal of Vacuum Science & Technology A Vacuum Surfaces and Films

The parameters of reactive pulsed laser deposition were successfully optimized for fabrication of vanadium dioxide thin films. It is observed that the O2 concentration in Ar gas and the total deposition pressure are critical in stabilizing the single VO2 phase. Thermochromic VO2 and V1−xWxO2 (x=0.014) thin films were…

Gas Sensing Nanomaterials and SensorsAdvanced Memory and Neural ComputingTransition Metal Oxide Nanomaterials

New Technologies for Drug Delivery Across the Blood Brain Barrier

Alexander V. Kabanov、Elena V. Batrakova2004-05-01Current Pharmaceutical Design

The blood-brain barrier (BBB) efficiently restricts penetration of therapeutic agents to the brain from the periphery. Therefore, discovery of new modalities allowing for effective delivery of drugs and biomacromolecules to the central nervous system (CNS) is of great need and importance for treatment of neurodegenera…

Nanoparticle-Based Drug DeliveryDrug Transport and Resistance MechanismsAdvanced Drug Delivery Systems