Susan Dadbin、Masoud Frounchi2003-05-22Journal of Applied Polymer Science
Abstract Tough, optically clear simultaneous interpenetrating polymer networks (SINs) of polyurethane (PU) and poly(allyl diglycol carbonate) (ADC) at different compositions were synthesized. The effects of the molecular weight of PU soft segment on the morphology, mechanical properties, and thermal transition behavio…
Polymer Nanocomposites and PropertiesPolymer composites and self-healingEpoxy Resin Curing Processes
A. Tilke、L. Pescini、H. Lorenz 等 4 位作者2003-05-22Applied Physics Letters
We realized bolometers in suspended highly n-doped silicon nanowires with lateral dimensions down to about 40 nm. Random dopant fluctuations in the suspended wires lead to the formation of multiple tunnel junctions, utilized for Coulomb blockade thermometry. In the low bias regime, we observe relaxation via discrete a…
Thermal properties of materialsAdvanced Thermodynamics and Statistical MechanicsThermal Radiation and Cooling Technologies
Asiloé J. Mora、Andrew N. Fitch、Belkis Ramírez 等 6 位作者2003-05-22Acta Crystallographica Section B Structural Science
The crystal structure of lithium benzilate hemihydrate (C(14)H(11)O(3)(-)Li(+).0.5H(2)O) was solved from synchrotron powder diffraction data. This compound crystallizes in the monoclinic space group P2(1)/a. The structure was solved via the direct space search for two benzilate fragments using the simulated-annealing…
Crystallography and molecular interactionsChemical Synthesis and CharacterizationX-ray Diffraction in Crystallography
Lijun Jiang、Yee Cheong Lam、C. Y. Yue 等 6 位作者2003-05-22Journal of Applied Polymer Science
Abstract Interfacial slip at high‐density polyethylene (HDPE)/polystyrene (PS) and high‐impact polystyrene (HIPS)/PS interfaces under steady shear was studied. The multilayer structure and energy model for steady shear proposed by Lam and colleagues was employed. Results indicated that there was no interfacial slip at…
Polymer crystallization and propertiesPolymer Nanocomposites and PropertiesRheology and Fluid Dynamics Studies
Charoen Nakason、Azizon Kaesaman、Adisai Rungvichaniwat 等 5 位作者2003-05-22Journal of Applied Polymer Science
Abstract Graft copolymers of natural rubber (NR) and methyl methacrylate (MMA) were prepared using cumene hydroperoxide and tetraethylene pentamine as redox initiators via the semibatch emulsion polymerization technique. Various molar percentage ratios of NR/MMA were studied in the grafting reaction (i.e., 95/5, 90/10…
Polymer crystallization and propertiesPolymer Nanocomposites and Propertiesbiodegradable polymer synthesis and properties
Yongguo Zhou、Yuedong Yang、X.X. Guo 等 4 位作者2003-05-22Journal of Applied Polymer Science
Abstract Copper chitosan complexes prepared by different specifications of chitosan and copper sulfate were used as urea sorbents. Experimental results showed that the adsorption capacity for urea of copper chitosan increased with an increasing degree of deacetylation and decreasing molecular weight of chitosan. The u…
Nanocomposite Films for Food PackagingElectrospun Nanofibers in Biomedical ApplicationsPolymer Surface Interaction Studies
Longan Shang、Min Jiang、Chul Hee Ryu 等 6 位作者2003-05-22Biotechnology and Bioengineering
In order to see the effect of CO(2) inhibition resulting from the use of pure oxygen, we carried out a comparative fed-batch culture study of polyhydroxybutyric acid (PHB) production by Ralstonia eutropha using air and pure oxygen in 5-L, 30-L, and 300-L fermentors. The final PHB concentrations obtained with pure O(2)…
Enzyme Catalysis and Immobilizationbiodegradable polymer synthesis and propertiesMicrobial metabolism and enzyme function
Wenbing Hu、Daan Frenkel、Vincent B. F. Mathot2003-05-22The Journal of Chemical Physics
We report Monte Carlo simulations of a lattice-polymer model that can account for both polymer crystallization and liquid–liquid demixing in solutions of semiflexible homopolymers. In our model, neighboring polymer segments can have isotropic interactions that affect demixing, and anisotropic interactions that are res…
Polymer crystallization and propertiesMaterial Dynamics and PropertiesBlock Copolymer Self-Assembly
Yuri Martı́nez-Ratón、José A. Cuesta2003-05-22The Journal of Chemical Physics
The first goal of this article is to study the validity of the Zwanzig model for liquid crystals to predict transitions to inhomogeneous phases (like smectic and columnar) and the way polydispersity affects these transitions. The second goal is to analyze the extension of the Zwanzig model to a binary mixture of rods…
Liquid Crystal Research AdvancementsMaterial Dynamics and PropertiesMolecular spectroscopy and chirality
F. Spaziani、M.C. Rossi、S. Salvatori 等 5 位作者2003-05-22Applied Physics Letters
A diamond detector structure for uniform and efficient collection of photogenerated carriers in the ultraviolet spectral range is presented. The device operating principle is based on the contemporary collection of both photogenerated carriers in the bulk, and photoelectrons emitted from the diamond surface. A three-e…
Diamond and Carbon-based Materials ResearchGa2O3 and related materialsPhotocathodes and Microchannel Plates
Thorsten Trupke、Martin A. Green、Peter Würfel2003-05-22Journal of Applied Physics
Based on a simple two-level system, we discuss optical gain in materials with indirect optical transitions. We show that contrary to direct materials the absolute value of the negative absorption coefficient, which describes the optical gain, can be orders of magnitude larger in indirect semiconductors than the positi…
Thin-Film Transistor TechnologiesSilicon Nanostructures and PhotoluminescenceNanowire Synthesis and Applications
Xiaozhen Lu、Andréa Prosperetti、Ruediger Toegel 等 4 位作者2003-05-22Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
It is known from experiment that the light emission from a sonoluminescing bubble can be increased by using more than one driving frequency. In this paper, a systematic method to determine the optimal conditions of pressure amplitude and relative phase for this effect is described. As a specific application, a two-fre…
Ultrasound and Hyperthermia ApplicationsUltrasound and Cavitation PhenomenaPhotoacoustic and Ultrasonic Imaging
Islam A. Salama、Nathaniel R. Quick、Aravinda Kar2003-05-22Journal of Applied Physics
A nanosecond pulsed laser direct-write and doping (LDWD) technique is used for the fabrication of carbon-rich silicon carbide nanoribbons heterostructure in a single crystal 4H–SiC wafer. Characterization by high-resolution transmission electron microscope and selected area electron diffraction pattern revealed the pr…
Carbon Nanotubes in CompositesGraphene research and applicationsDiamond and Carbon-based Materials Research
Jian Gong、Xiangdan Li、Bin Ding 等 5 位作者2003-05-22Journal of Applied Polymer Science
Abstract For the first time, high‐percentage molybdosilicic acid fiber mats (20–80% H 4 SiMo 12 O 40 ) were prepared using the electrospinning technique. The fiber mats were characterized by IR, XRD, and DSC. The results indicated that poly(vinyl alcohol) was changed from a semicrystalline to an amorphous state with a…
Supercapacitor Materials and FabricationConducting polymers and applicationsElectrospun Nanofibers in Biomedical Applications
Steven C. Seel、Carl V. Thompson2003-05-22Journal of Applied Physics
During the deposition of films that grow by the Volmer–Weber mechanism, crystallites nucleate as isolated islands, grow larger to impinge with other islands, and eventually coalesce into a continuous film. Tensile stress generation due to grain boundary formation during island coalescence, commonly referred to as isla…
Metal and Thin Film MechanicsDiamond and Carbon-based Materials ResearchAdhesion, Friction, and Surface Interactions
Li‐Min Wang、C. Austen Angell2003-05-22The Journal of Chemical Physics
We give a brief review of how activation energies from scan-rate-dependent Tg studies have been correlated with those for viscosity and other relaxation processes, in order to place the present study in context with previous work, including that referred to in the comment. Then we examine the ensuing question of the e…
Material Dynamics and PropertiesTheoretical and Computational PhysicsChemical Thermodynamics and Molecular Structure
Lyudmila M. Bronstein、Dmitri M. Chernyshov、Robert L. Karlinsey 等 9 位作者2003-05-22Chemistry of Materials
Cationic and anionic microgels based on sulfonated polystyrene and poly(ethylmethacryltetramethylammonium chloride) and containing Pd and Pt nanoparticles were used as templates along with polystyrene- block -poly(ethylene oxide) block copolymers for casting nanoporous alumina and aluminosilica with nanoparticles. The…
Mesoporous Materials and CatalysisCatalysis for Biomass ConversionCatalysis and Hydrodesulfurization Studies
G. Lucadamo、Douglas L. Medlin2003-05-22Science
Using electron microscopy, we identify local, intergranular regions of hexagonal close-packing at a grain boundary in gold. By analyzing the topological defects that connect this layer to the adjacent face-centered cubic grains, we explain the geometric origin of this interfacial reconstruction. We extend this analysi…
Microstructure and mechanical propertiesIon-surface interactions and analysisnanoparticles nucleation surface interactions
Junbo Gao、José-María Sansiñena、Haiyan Wang2003-05-22Chemistry of Materials
Polyaniline (PANI) porous asymmetric membranes were prepared using a phase-inversion technique, and their bending−recovery behavior induced by sorption and desorption of chemical vapors was studied. It was found that the bending−recovery rates and maximum bending angles of the membranes were different in various vapor…
Advanced Sensor and Energy Harvesting MaterialsConducting polymers and applicationsDielectric materials and actuators
Yasukazu Murakami、Daisuke Shindo、Katsunari Oikawa 等 5 位作者2003-05-22Applied Physics Letters
Behaviors of magnetic domains with cooling in a Ni51Fe22Ga27 ferromagnetic shape memory alloy were examined by electron holography and Lorentz microscopy. A peculiar meshy pattern was observed in the Lorentz microscope image of the parent phase, being concurrent with the anomaly in the thermomagnetization curve. The m…
Magnetic and transport properties of perovskites and related materialsShape Memory Alloy TransformationsPaleontology and Evolutionary Biology