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Static dielectric constant of isolated silicon nanocrystals embedded in a SiO2 thin film

C. Y. Ng、T. P. Chen、Lu Ding 等 7 位作者2006-02-03Applied Physics Letters

The static dielectric constant of isolated silicon nanocrystals (nc-Si) embedded in a SiO2 thin film synthesized by Si+ implantation has been determined from capacitance measurement based on the Maxwell–Garnett effective medium approximation and the stopping and range of ions in matter simulation. For the nc-Si with a…

Semiconductor materials and devicesSilicon Nanostructures and PhotoluminescenceSemiconductor materials and interfaces

Partial and split dislocation configurations in nanocrystalline metals

S. V. Bobylev、M. Yu. Gutkin、I. A. Ovid’ko2006-02-03Physical Review B

A theoretical model is suggested that describes the generation of partial and split dislocations at grain boundaries in nanocrystalline metals. The ranges of parameters (such as grain size and level of external stress) are theoretically revealed at which the formation of partial dislocation semi-loops is energetically…

Microstructure and mechanical propertiesSurface Treatment and Residual StressElectromagnetic Effects on Materials

Dynamics of Sulfonated Polystyrene Copolymers Using Broadband Dielectric Spectroscopy

Pornpen Atorngitjawat、Robert J. Klein、James Runt2006-02-03Macromolecules

We examine the dynamics of acid and methylated precursors to sulfonated polystyrene ionomers. Dielectric relaxation spectroscopy was the primary tool used in the investigation of the dynamics, and dynamic mechanical analysis, Fourier transform infrared spectroscopy, and differential scanning calorimetry were employed…

Material Dynamics and PropertiesIonic liquids properties and applicationsThermodynamic properties of mixtures

Synthesis, characterization, effect of architecture on crystallization, and spherulitic growth of poly(L‐lactide)‐b‐poly(ethylene oxide) copolymers with different branch arms

Chen Cai、Lu Wang、Chang‐Ming Dong2006-02-03Journal of Polymer Science Part A Polymer Chemistry

Abstract Well‐defined poly( L ‐lactide)‐ b ‐poly(ethylene oxide) (PLLA‐ b ‐PEO) copolymers with different branch arms were synthesized via the controlled ring‐opening polymerization of L ‐lactide followed by a coupling reaction with carboxyl‐terminated poly(ethylene oxide) (PEO); these copolymers included both star‐sh…

Polymer crystallization and propertiesbiodegradable polymer synthesis and propertiesElectrospun Nanofibers in Biomedical Applications

First-principles study of the anisotropic thermal expansion of wurtzite ZnS

Shaoqing Wang2006-02-03Applied Physics Letters

In this letter, a first-principles study of the anisotropic thermal expansion of wurtzite ZnS in the framework of the density-functional theory and the density-functional perturbation theory is reported. The compound in zinc blende structure is also studied for comparison. The curves of the linear and volume thermal e…

Quantum Dots Synthesis And Propertiesnanoparticles nucleation surface interactionsChemical and Physical Properties of Materials

Determination of the Exciton Binding Energy in Single-Walled Carbon Nanotubes

Zhenjia Wang、Hermen Pedrosa、Todd D. Krauss 等 4 位作者2006-02-03Physical Review Letters

We report that measurements of the Raman intensity versus applied voltage are sensitive to filling of the density of states and enable us to measure the second band gap in specific semiconducting single-walled carbon nanotubes (SWNTs). Raman scattering preferentially selects sets of SWNTs whose excitonic transitions a…

Carbon Nanotubes in CompositesGraphene research and applicationsMechanical and Optical Resonators

Effect of uniaxial compressive pre-stress on ferroelectric properties of soft PZT ceramics

Rattikorn Yimnirun、Yongyut Laosiritaworn、Supattra Wongsaenmai2006-02-03Journal of Physics D Applied Physics

The effect of uniaxial compressive pre-stress on the ferroelectric properties of commercial soft PZT ceramics is investigated. The ferroelectric properties under the uniaxial compressive pre-stress of the ceramics are observed at stress up to 24 MPa using a compressometer in conjunction with a modified Sawyer–Tower ci…

Ferroelectric and Piezoelectric MaterialsMultiferroics and related materialsMicrowave Dielectric Ceramics Synthesis

Structural and Photoisomerization Cross Studies of Polar Photochromic Monomeric Glasses Forming Surface Relief Gratings

Éléna Ishow、Bertrand Lebon、Yaning He 等 7 位作者2006-02-03Chemistry of Materials

A novel class of photochromic materials based on polar azo derivatives containing functionalized biphenyl substituents has been synthesized. Once melt and cooled, these compounds formed amorphous transparent monomeric materials whose glass transition temperatures depend mainly on the bulkiness of the biphenyl substitu…

Liquid Crystal Research AdvancementsPhotochemistry and Electron Transfer StudiesPhotochromic and Fluorescence Chemistry

Properties and phase transition of the ordered perovskite Pb2MnWO6

J. Blasco、R.I. Merino、J. Garcı́a 等 4 位作者2006-02-03Journal of Physics Condensed Matter

Pb 2 MnWO 6 has been synthesized and its structure determined by powder x-ray diffraction. This sample undergoes a first order structural phase transition at ∼445 K. This transition is coupled to a change in the electrical properties manifested by a sharp discontinuity of the dielectric permittivity at the phase trans…

Ferroelectric and Piezoelectric MaterialsMultiferroics and related materialsAdvanced Condensed Matter Physics

Transport properties of a-SnxSb20Se80−x(8 ⩽x⩽ 18) chalcogenide glass

Praveen Kumar、K. S. Bindra、Nikhil Suri 等 4 位作者2006-02-03Journal of Physics D Applied Physics

X-ray diffraction and differential scanning calorimetric studies were performed on bulk Sn–Sb–Se chalcogenide alloys, which were obtained by the conventional melt quenching technique. The addition of Sn reduces the crystalline nature of Sb20Se80 chalcogenide alloy and amorphous samples are obtained for a-SnxSb20Se80−x…

Glass properties and applicationsChalcogenide Semiconductor Thin FilmsPhase-change materials and chalcogenides

Control of the ZnO Nanowires Nucleation Site Using Microfluidic Channels

Sang Hyun Lee、Jong‐Won Lee、D. C. Oh 等 12 位作者2006-02-03The Journal of Physical Chemistry B

We report on the growth of uniquely shaped ZnO nanowires with high surface area and patterned over large areas by using a poly(dimethylsiloxane) (PDMS) microfluidic channel technique. The synthesis uses first a patterned seed template fabricated by zinc acetate solution flowing though a microfluidic channel and then g…

ZnO doping and propertiesNanowire Synthesis and ApplicationsNanomaterials and Printing Technologies

Ceramic Matrix Composites

作者信息未提供2006-02-03OpenAlex

Part 1 Fibre, whisker and particulate-reinforced ceramic composites: Fibrous monolithic ceramics Whisker reinforced silicon nitride ceramics Fibre reinforced glass/glass-ceramic matrix composites Particulate composites. Part 2 Graded and layered composites: Functionally-graded ceramic composites SiAlON based functiona…

Advanced ceramic materials synthesisAdditive Manufacturing and 3D Printing TechnologiesSynthesis and properties of polymers

Influence of Shear Flow on the Specific Volume and the Crystalline Morphology of Isotactic Polypropylene

Maurice H. E. Van der Beek、Gwm Gerrit Peters、H.E.H. Meijer2006-02-03Macromolecules

The influence of shear flow on the temperature evolution of the specific volume and the crystalline morphology of two iPP's, differing in weight-averaged molar mass M̄ w, was investigated at nonisothermal conditions and elevated pressures, using a custom-designed dilatometer. These conditions are typically in the rang…

Polymer crystallization and propertiesPolymer Nanocomposites and PropertiesRheology and Fluid Dynamics Studies

Gas solubility of carbon dioxide in poly(lactic acid) at high pressures

Nelson S. Oliveira、John R. Dorgan、João A. P. Coutinho 等 6 位作者2006-02-03Journal of Polymer Science Part B Polymer Physics

Abstract The sorption of carbon dioxide in poly(lactic acid) (PLA) was studied by quartz crystal microbalance at high pressures. To address the effect of the D isomer present in the polymer on the gas sorption, measurements were performed in PLA with two different L:D contents, 80:20 and 98:2. New data for the solubil…

Advanced Sensor and Energy Harvesting MaterialsMembrane Separation and Gas TransportPolymer Foaming and Composites

Novel Functional Hyperbranched Polyether Polyols as Prospective Drug Delivery Systems

Leto‐Aikaterini Tziveleka、Christina Kontoyianni、Zili Sideratou 等 5 位作者2006-02-03Macromolecular Bioscience

Abstract Summary: Multifunctional hyperbranched polyether polyols bearing protective poly(ethylene glycol) (PEG) chains with or without the folate targeting ligand at their end have been prepared. Solubilization in these polymers of a fluorescent probe, pyrene, and an anticancer drug, tamoxifen, was physicochemically…

RNA Interference and Gene DeliveryDendrimers and Hyperbranched PolymersSynthesis and Characterization of Heterocyclic Compounds

Chemical Substituent Effects on Morphological Transitions in Styrene−Butadiene−Styrene Triblock Copolymer Grafted with Polyhedral Oligomeric Silsesquioxanes

Daniel B. Drazkowski、André Lee、Timothy S. Haddad 等 4 位作者2006-02-03Macromolecules

A series of hybrid organic/inorganic triblock copolymers of polystyrene−butadiene−polystyrene (SBS) grafted with polyhedral oligomeric silsesquioxane (POSS) molecules with different chemical constituents were synthesized by a hydrosilation method. Four POSS macromers, R‘R 7 Si 8 O 12, were designed to contain a single…

Corrosion Behavior and InhibitionBlock Copolymer Self-AssemblySilicone and Siloxane Chemistry

Surface transfer doping of diamond

J. Ristein2006-02-03Journal of Physics D Applied Physics

Hydrogen-terminated diamond can exhibit a pronounced two-dimensional hole conductivity when it is exposed to appropriate adsorbates. This phenomenon was first encountered in the form of the so-called hydrogen-induced surface conductivity but is meanwhile understood as a novel kind of doping mechanism by which the surf…

High-pressure geophysics and materialsSemiconductor materials and devicesDiamond and Carbon-based Materials Research

Synthesis and room temperature ferromagnetism of FeCo-codoped ZnO nanowires

Luoqin Liu、Bin Xiang、X. Z. Zhang 等 5 位作者2006-02-03Applied Physics Letters

FeCo-codoped ZnO nanowires were synthesized by in situ doping with iron and cobalt using a chemical vapor deposition method. Structure and compositional analysis indicated that the as-prepared nanowires were single- crystalline and FeCo codoped. No FeCo clusters and other secondary phases were found in the nanowires.…

ZnO doping and propertiesCopper-based nanomaterials and applicationsGa2O3 and related materials

Preparation of a Nanowire‐Structured Polyaniline Composite and Gas Sensitivity Studies

Xingfa Ma、Guang Li、Mang Wang 等 6 位作者2006-02-03Chemistry - A European Journal

To obtain organic nanowire sensors with high sensitivity and rapid response times, based on the inducement effect of surfactants during in situ polymerization, nanostructured polyaniline composites are obtained by using a chemical oxidation method by adding a small amount of surfactant. A casting method is employed on…

Electrochemical sensors and biosensorsConducting polymers and applicationsAnalytical Chemistry and Sensors

Molding Mineral within Microporous Hydrogels by a Polymer-Induced Liquid-Precursor (PILP) Process

Xingguo Cheng、Laurie B. Gower2006-02-03Biotechnology Progress

Natural biominerals often have exquisite morphologies, where the cells exercise a high degree of crystallographic control through secretion of biological macromolecules and regulation of ion transport. One important example is the sea urchin spine. It has recently been shown to be formed through deposition of a transi…

Calcium Carbonate Crystallization and InhibitionMarine Biology and Environmental ChemistryCephalopods and Marine Biology