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Alkali Silicates and Crystalline Silicic Acids

Scott M. Auerbach、Kathleen A. Carrado、Prabir K. Dutta2004-03-23OpenAlex

Silicates occur in a great number of minerals and rocks as well as in numerous technical products. Materials containing silicates constitute the basis of many different branches of industry. Apart from their principal applications in the construction, glass, and ceramic industries, siliceous materials have achieved an…

Zeolite Catalysis and SynthesisMesoporous Materials and CatalysisClay minerals and soil interactions

Dynamic rheological properties of high‐density polyethylene/polystyrene blends extruded in the presence of ultrasonic oscillations

Guangshun Chen、Shaoyun Guo、Yuntao Li2004-03-23Journal of Applied Polymer Science

Abstract The linear rheological properties of high‐density polyethylene (HDPE), polystyrene (PS), and HDPE/PS (80/20) blends were used to characterize their structural development during extrusion in the presence of ultrasonic oscillations. The master curves of the storage shear modulus ( G ′) and loss shear modulus (…

Polymer crystallization and propertiesRheology and Fluid Dynamics StudiesPolymer Foaming and Composites

Effects of solvent adsorption on solution properties of poly(vinyl alcohol)/dimethylsulfoxide/water ternary systems

Shi‐Jie Hong、Hsing‐Tsai Huang、Po‐Da Hong2004-03-23Journal of Applied Polymer Science

Abstract In this study, the solvent adsorption phenomena of poly(vinyl alcohol) (PVA) in cosolvent mixtures of dimethylsulfoxide (DMSO; solvent 1) and water (solvent 2) were investigated. Typically, this cosolvent mixture could form hydrogen‐bonded DMSO/(water) 2 complexes, involving one DMSO and two water molecules.…

Advanced Polymer Synthesis and Characterizationbiodegradable polymer synthesis and propertiesPolymer Science and PVC

Determination of a novel structure by a combination of long-wavelength sulfur phasing and radiation-damage-induced phasing

M.S. Weiss、Gerd J. Mander、Reiner Hedderich 等 6 位作者2004-03-23Acta Crystallographica Section D Biological Crystallography

The structure of the 115 amino-acid residue protein DsvC was determined based on the anomalous scattering provided by the five S atoms present in the structure. By collecting the diffraction data at a wavelength of 1.9 A, the anomalous signal provided by the S atoms was enhanced. However, significant radiation damage…

Protein Structure and DynamicsMass Spectrometry Techniques and ApplicationsEnzyme Structure and Function

La-induced conversion between the ferroelectric and antiferroelectric incommensurate phases inPb1−xLax(Zr1−yTiy)O3

T. Asada、Yasuhito Koyama2004-03-23Physical Review B

In La-substituted ${\mathrm{Pb}}_{1\ensuremath{-}x}{\mathrm{La}}_{x}({\mathrm{Zr}}_{0.95}{\mathrm{Ti}}_{0.05}){\mathrm{O}}_{3},$ an increase in the La content $x$ served to convert the ferroelectric incommensurate (FI) phase into the antiferroelectric incommensurate (AI) phase around $x=0.01.$ In order to elucidate th…

Ferroelectric and Piezoelectric MaterialsCrystal Structures and PropertiesSolid-state spectroscopy and crystallography

Vascular graft healing. III. FTIR analysis of ePTFE graft samples from implanted bigrafts

Jacqueline Murray–Wijelath、Donald J. Lyman、Errol S. Wijelath2004-03-23Journal of Biomedical Materials Research Part B Applied Biomaterials

A bigraft, composed of a 30-microm internodal distance expanded polytetrafluoroethylene (ePTFE) arterial graft segment and a preclotted polyethylene terephthalate arterial graft segment, was used to study the healing process of two different materials in the same dog. Healing was followed by FTIR-ATR spectroscopy and…

Electrospun Nanofibers in Biomedical ApplicationsPolymer Surface Interaction StudiesTissue Engineering and Regenerative Medicine

Self-Assembled Na12[WZn3(ZnW9O34)2] as an Industrially Attractive Multi-Purpose Catalyst for Oxidations with Aqueous Hydrogen Peroxide

Peter T. Witte、Paul L. Alsters、Walther Jary 等 7 位作者2004-03-23Organic Process Research & Development

Eleven W-based catalyst systems for alkene epoxidation with aqueous H 2 O 2 were compared under identical conditions and at equal level of 0.1 mol % W-atoms. Of these, those based on a combination of H 2 WO 4 and a methyltrioctylammonium phase transfer catalyst turned out to be most active in particular systems that c…

Polyoxometalates: Synthesis and ApplicationsCatalysis and Oxidation ReactionsOxidative Organic Chemistry Reactions

Kaolin modified with new resin–iron chelate as flame retardant system for polypropylene

Adel B. Shehata、Mohamed Hassan、N. A. Darwish2004-03-23Journal of Applied Polymer Science

Abstract Polypropylene's fire‐retardant properties can be improved by using modified kaolin. Modification was done by reaction of kaolin with a prepared resin–iron chelate. Polypropylene samples were loaded with different amounts of kaolin, modified kaolin, and their mixture. Ignition properties of the produced sample…

Polymer Nanocomposites and PropertiesFire dynamics and safety researchFlame retardant materials and properties

Assessing crystallization droplets using birefringence

Aude Echalier、Rashi Glazer、Vilmos Fülöp 等 4 位作者2004-03-23Acta Crystallographica Section D Biological Crystallography

In this paper, the detection of crystalline elements in protein crystallization droplets containing precipitate is illustrated using the rotating-polarizer microscope technique. The sensitivity of this automated birefringence technique enables the detection of microcrystals in a precipitate that appears to be amorphou…

Protein Structure and DynamicsEnzyme Structure and FunctionCrystallization and Solubility Studies

Electron Delocalization in One-Electron Oxidized Aniline Oligomers, Paradigms for Polyaniline. A Study by Paramagnetic Resonance in Fluid Solution

B. Grossmann、Jürgen Heınze、Thomas Moll 等 6 位作者2004-03-23The Journal of Physical Chemistry B

How far is an electron delocalized in organic conducting polymers? Insights into this aspect are presented by analyzing the spin distribution in radical cations of seven differently substituted aniline oligomers. The paramagnetic stages of dimers, tetramers, and hexamers were studied by EPR/ENDOR spectroscopy in fluid…

Organic Electronics and PhotovoltaicsConducting polymers and applicationsElectrochemical Analysis and Applications

Unusual Component Dynamics in Poly(ethylene oxide)/Poly(methyl methacrylate) Blends As Probed by Deuterium NMR

K. L. Ngai、C. M. Roland2004-03-23Macromolecules

We analyze recent deuterium NMR data on blends of poly(ethylene oxide) (PEO) with poly(methyl methacrylate) (PMMA), using a model for the blend dynamics based on the coupling model. This model has previously been shown to describe the relaxation properties of blends whose component dynamics are strongly composition de…

Material Dynamics and PropertiesAdvanced Physical and Chemical Molecular InteractionsNMR spectroscopy and applications

Spin-glass behavior inLa(Fe1−xMnx)11.4Si1.6compounds

Fang Wang、Jian Zhang、Yuanfu Chen 等 7 位作者2004-03-23Physical Review B

The magnetic properties of $\mathrm{La}({\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}{)}_{11.4}{\mathrm{Si}}_{1.6}$ $(0<~x<~0.08)$ compounds were investigated. A reentrant spin glass behavior for the sample with $x=0.06$ and a paramagnetic-to-spin glass transition for the sample with $x=0.08$ were observed.…

Magnetic and transport properties of perovskites and related materialsRare-earth and actinide compoundsMagnetic Properties of Alloys

Study on hot air aging and thermooxidative degradation of peroxide prevulcanized natural rubber latex film

Bei‐Long Zhang、Mei Chen、Ning‐Jian Ao 等 5 位作者2004-03-23Journal of Applied Polymer Science

Abstract The air‐aging process at 120°C and the thermooxidative degradation of peroxide prevulcanized natural rubber latex (PPVL) film were studied with FTIR and thermal gravity (TG) and differential thermal gravity (DTG) analysis, respectively. The result of FTIR shows that the OH and COOH absorption of the rubber…

Polymer crystallization and propertiesPolymer Nanocomposites and PropertiesPolymer composites and self-healing

Anomalous behavior of spin-wave resonances inGa1−xMnxAsthin films

Tatiana G. Rappoport、Paweł Redliński、X. Liu 等 6 位作者2004-03-23Physical Review B

We report ferromagnetic and spin-wave resonance absorption measurements on high quality epitaxially grown ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As}$ thin films. We find that these films exhibit robust ferromagnetic long-range order, based on the fact that up to seven resonances are detected at low…

Magnetic properties of thin filmsZnO doping and propertiesMagnetic and transport properties of perovskites and related materials

Hole-doping effect on the thermoelectric properties and electronic structure of CoSi

C. S. Lue、Y. K. Kuo、Chaur-Chi Huang 等 4 位作者2004-03-23Physical Review B

We report the effect of Al substitution on the temperature-dependent electrical resistivity, Seebeck coefficient, as well as thermal conductivity in the binary compound cobalt monosilicide. It is found that the substitution of Al onto the Si sites causes a dramatic decrease in the electrical resistivity and lattice th…

Advanced Thermoelectric Materials and DevicesThermal properties of materialsThermal Expansion and Ionic Conductivity

Dimeric Aluminum Chloride Complexes of N-Alkoxyalkyl-β-ketoimines: Activation with Propylene Oxide To Form Efficient Lactide Polymerization Catalysts

Simon Doherty、R. John Errington、N. Housley 等 4 位作者2004-03-23Organometallics

The ter- and tetradentate N -alkoxyalkyl-β-ketoimines CH 3 C(O)CH 2 C(NCH 2 CHROH)CH 3 { L 1 - 3 } react with diethylaluminum chloride to afford the dimeric chloride bridged complexes [{ L 1 - 3 }AlCl] 2 ( 1a − c ), which are activated by addition of propylene oxide or cyclohexene oxide to afford efficient initiators…

Organometallic Complex Synthesis and Catalysisbiodegradable polymer synthesis and propertiesCarbon dioxide utilization in catalysis

Determination of dissociable groups in natural and regenerated cellulose fibers by different titration methods

Lidija Fras、Janne Laine、Per Stenius 等 6 位作者2004-03-23Journal of Applied Polymer Science

Abstract Different titration methods were applied with the purpose to determine the dissociation properties of a natural (cotton) and regenerated (viscose, modal and lyocell) cellulose fibers. Potentiometric and conductometric titration were used to determine the content of acidic groups. pK values were determined by…

Surface Modification and SuperhydrophobicityAdvanced Cellulose Research StudiesElectrostatics and Colloid Interactions

Nanoscale Cage-like Structures Derived from Polyisoprene-Containing Shell Cross-linked Nanoparticle Templates

Jeffrey L. Turner、Karen L. Wooley2004-03-23Nano Letters

Hollowed materials of nanoscopic dimensions offer exciting possibilities in a number of fields such as therapeutics and imaging. The production of nanoscopic cage-like materials is described, based upon the excavation of shell cross-linked nanoparticle (SCK) templates. This report focuses upon extensive characterizati…

Nanoparticle-Based Drug DeliveryAdvanced Polymer Synthesis and CharacterizationPolymer Surface Interaction Studies

Layered Double Hydroxides (Ldhs)

Zhi Ping Xu、Paul S. Braterman、Faith Yarberry2004-03-23OpenAlex

In this chapter we present an overview of what we regard as the most significant areas of recent activity in layered double hydroxide chemistry, using documents known to us through mid-2002, with occasional later examples. While we have attempted to give credit to the initiators in each area, we make no claims to ascr…

Polyoxometalates: Synthesis and ApplicationsLayered Double Hydroxides Synthesis and ApplicationsInorganic Chemistry and Materials

Feedback processes in cellulose thermal decomposition: implications for fire-retarding strategies and treatments

Rowena Ball、Andy C. McIntosh、J. Brindley2004-03-23Combustion Theory and Modelling

A simple dynamical system that models the competitive thermokinetics and chemistry of cellulose decomposition is examined, with reference to evidence from experimental studies indicating that char formation is a low activation energy exothermal process and volatilization is a high activation energy endothermal process…

Lignin and Wood ChemistryFire dynamics and safety researchFlame retardant materials and properties