Florin Dan、Cleopatra Vasiliu‐Oprea1998-01-10Journal of Applied Polymer Science
The relationship between the type of activator and the morphology of polycaproamide (PCA) powders was investigated. The powders were prepared by anionic polymerization of caprolactam in ethylbenzene using sodium caprolactamate as initiator and CO2, diisopropylcarbodiimide, and dicyclohexylcarbodiimide as activators. T…
biodegradable polymer synthesis and propertiesMembrane Separation and Gas TransportSynthesis and properties of polymers
Qin Sun、Dong Zhang1998-01-10Journal of Applied Polymer Science
Meltblown is one of the fastest growing processes for nonwoven production. The design of the coat-hanger geometry of a die is very important for meltblown technology. In this article, melt rheological properties were studied based on capillary rheometry, followed by analysis and simulation of the melt flow in the die…
Material Properties and ProcessingTextile materials and evaluationsRheology and Fluid Dynamics Studies
Darrel L. Negelein、Rong Lin、Robert L. White1998-01-10Journal of Applied Polymer Science
Effects of catalyst acidity and the restricted reaction volume afforded by HZSM-5 on the catalytic cracking of polypropylene are described. Polypropylene cracking by silica—alumina and HZSM-5 catalysts yields olefins as primary volatile products. In addition, HZSM-5 channels restrict carbenium ion rearrangements and f…
Polymer crystallization and propertiesZeolite Catalysis and SynthesisPolymer Nanocomposites and Properties
François Guyon、Annig Pondaven、J.-M. Kerbaol 等 4 位作者1998-01-10Inorganic Chemistry
(1,2-Naphthalocyaninato)lutetium(III), bis(1,2-naphthalocyaninato)lutetium(III), and tris(1,2-naphthalocyaninato)dilutetium(III) have been synthesized in good yields. These complexes were characterized by UV-visible, (1)H NMR, and mass spectroscopies and by electrochemical techniques. Bis(1,2-naphthalocyaninato)luteti…
Electrochemical Analysis and ApplicationsPorphyrin and Phthalocyanine ChemistryAnalytical Chemistry and Sensors
Enrique R. Losilla、Miguel Á. G. Aranda、S. Bruque 等 6 位作者1998-01-10Chemistry of Materials
The structures and electrical properties of four NASICON compositions, Na 1.4 M 1.6 In 0.4 (PO 4 ) 3 (M = Ti, Sn, Hf, Zr), have been determined and compared. Rietveld refinement of powder X-ray diffraction data confirmed the basic rhombohedral NASICON structure with random occupancy of the octahedral In/M sites, full…
Solid-state spectroscopy and crystallographyX-ray Diffraction in CrystallographyChemical Synthesis and Characterization
Luiz G. Ferreira、C. Wolverton、Alex Zunger1998-01-09arXiv
The success of the "Cluster Variation Method" (CVM) in reproducing quite accurately the free energies of Monte Carlo (MC) calculations on Ising models is explained in terms of identifying a cancellation of errors: We show that the CVM produces correlation functions that are too close to zero, which leads to an overest…
Materials Science
S. Vásquez1998-01-08The Journal of Chemical Physics
As part of a series of studies on energy transfer processes between optical centers in condensed matter, an analysis is made of the problem of a crystalline system made up by a majority of regular optical centers and small amounts of defective optical centers. Within the conceptual framework of the crystal model, anal…
Luminescence Properties of Advanced MaterialsPhotorefractive and Nonlinear OpticsGlass properties and applications
Gagik G. Gurzadyan、T.-H. Tran-Thi、T. Gustavsson1998-01-08The Journal of Chemical Physics
Depopulation of the S2 excited electronic state of the Zn-tetraphenylporphyrin (ZnTPP) was monitored by measuring the decay of S2→S0 and the rise of S1→S0 fluorescence using the up-conversion fluorescence technique with a time-resolution of 120 fs. The lifetime of the S2 electronic state, measured for ZnTPP in ethanol…
Porphyrin and Phthalocyanine ChemistryPhotodynamic Therapy Research StudiesPhotochemistry and Electron Transfer Studies
M. W. Matsen1998-01-08The Journal of Chemical Physics
Monodisperse melts of ABC linear triblock copolymer are examined using self-consistent field theory (SCFT). Our study is restricted to symmetric triblocks, where the A and C blocks are equal in size and the A/B and B/C interactions are identical. Furthermore, we focus on the regime where B forms the majority domain. T…
Theoretical and Computational PhysicsBlock Copolymer Self-AssemblyRheology and Fluid Dynamics Studies
Dong‐Kyun Seo、Nithin Gupta、Myung‐Hwan Whangbo 等 5 位作者1998-01-08Inorganic Chemistry
Tight-binding electronic band structures of cesium trihalometalates CsGeX(3) (X = Cl, Br) were calculated to examine the pressure-dependence of their crystal structures and band gaps as well as their primitive cubic to rhombohedral structural phase transitions. In agreement with experiment, our calculations show that…
Solid-state spectroscopy and crystallographyCrystal Structures and PropertiesPerovskite Materials and Applications
G. Caldarelli、R. Cafiero、A. Gabrielli1998-01-08arXiv
We introduce a model for fractures in quenched disordered media. This model has a deterministic extremal dynamics, driven by the energy function of a network of springs (Born Hamiltonian). The breakdown is the result of the cooperation between the external field and the quenched disorder. This model can be considered…
cond-mat.stat-mechMaterials Science
Noritaka Mizuno、Makoto Misono1998-01-08OpenAlex
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeterogeneous CatalysisNoritaka Mizuno and Makoto MisonoView Author Information Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113, Japan Cite this: Chem. Rev. 1998, 98, 1, 199–218Publication Date (Web):Janua…
Chemical Synthesis and ReactionsPolyoxometalates: Synthesis and ApplicationsMetal-Organic Frameworks: Synthesis and Applications
Ramchandra Pode、S J Dhoble1998-01-07Journal of Physics D Applied Physics
In recent years much attention has been paid to the study of radiation-induced defects in laser and luminescent materials, since they affect the optical and stimulated emission properties. Defects in : powder prepared by solid state diffusion have been studied by thermoluminescence (TL) and fluorescence measurements.…
Random lasers and scattering mediaLuminescence Properties of Advanced MaterialsSolid State Laser Technologies
Hisanobu Ogoshi、T. Mizutani1998-01-07Accounts of Chemical Research
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMultifunctional and Chiral Porphyrins: Model Receptors for Chiral RecognitionHisanobu Ogoshi and Tadashi MizutaniView Author Information Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Sakyo-ku, Kyoto 606-01, Japa…
Molecular Sensors and Ion DetectionSurface Chemistry and CatalysisPorphyrin and Phthalocyanine Chemistry
Yurii Matatov-Meytal、Moshe Sheintuch1998-01-07OpenAlex
The paper reviews solid-catalyzed oxidation and reduction processes for the treatment of wastewater that contains small concentrations of toxic compounds and for which separation is not economical while biological treatment is not feasible. Specifically, the objectives are (1) to understand the interactions between ca…
Catalytic Processes in Materials ScienceEnvironmental remediation with nanomaterialsAdvanced oxidation water treatment
Myong H. Lim、Christopher F. Blanford、Andreas Stein1998-01-07OpenAlex
Mercaptopropyl-functionalized porous silicates were synthesized by the co-condensation of (mercaptopropyl)triethoxysilane and tetramethoxysilane in the presence of a cationic surfactant. The ordered hexagonal arrays of channels in the extracted product were microporous (14 Å pore diameter) and contained high concentra…
Chemical Synthesis and ReactionsChemical Synthesis and CharacterizationMesoporous Materials and Catalysis
Eugenio Coronado、Carlos J. Gómez‐García1998-01-07OpenAlex
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxometalate-Based Molecular MaterialsEugenio Coronado and Carlos J. Gómez-GarcíaView Author Information Departamento de Química Inorgànica, Universitat de València, Doctor Moliner 50, 46100 Burjassot, Spain Cite this: Chem. Rev. 1998, 98, 1, 273–296Publication Date (Web)…
Polyoxometalates: Synthesis and ApplicationsMetal-Organic Frameworks: Synthesis and ApplicationsVanadium and Halogenation Chemistry
Toshihiro Yamase1998-01-07OpenAlex
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhoto- and Electrochromism of Polyoxometalates and Related MaterialsToshihiro YamaseView Author Information Research Laboratory of Resources Utilization, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226, JapanCite this: Chem. Rev. 1998, 98, 1, 307–326Pu…
Advanced Nanomaterials in CatalysisPolyoxometalates: Synthesis and ApplicationsConducting polymers and applications
José Luís de Paiva、George Cury Kachan1998-01-06Industrial & Engineering Chemistry Research
The absorption of dilute NO x gas was studied, at atmospheric pressure, in an industrial column packed with 25-mm plastic Pall rings. The scrubbing liquid was a dilute hydrogen peroxide solution. NO x removal efficiencies of 75−91% were obtained for gas mixtures with partial pressures of NO x in the range of 62.8−460…
Catalysis and Oxidation ReactionsIndustrial Gas Emission ControlCatalytic Processes in Materials Science
Peter D. Battle、Mark Green、J. Lago 等 6 位作者1998-01-06Chemistry of Materials
The crystal and magnetic structures of the n = 3 Ruddlesden−Popper phase with the ideal composition Ca 4 Mn 3 O 10 have been studied using X-ray and neutron powder diffraction. The crystal structure at 293 K is relatively insensitive to the partial pressure of oxygen used in sample preparation. A sample prepared in ai…
Multiferroics and related materialsAdvanced Condensed Matter PhysicsMagnetic and transport properties of perovskites and related materials