Srikanth Sastry、David S. Corti、Pablo G. Debenedetti 等 4 位作者1997-11-01Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
Packings of spheres serve as useful models of the geometry of many physical systems; in particular, the description of the void region in such packings (the region not occupied by the spheres) is crucial in many studies. The void region is, in general, composed of disconnected cavities. We present an algorithm for dec…
Material Dynamics and PropertiesPolysaccharides Composition and ApplicationsAdsorption, diffusion, and thermodynamic properties of materials
Beisong Cheng、Orde Q. Munro、Helder M. Marques 等 4 位作者1997-11-01Journal of the American Chemical Society
The crystal structures of three porphyrin diacid species, [H 4 OEP](ClO 4 ) 2, [H 4 TPP](ClO 4 ) 2, and [H 4 TMP](ClO 4 ) 2, have been determined from low-temperature X-ray diffraction data to delineate how the peripheral substituents of the porphyrin affect the overall molecular flexibility . [H 4 OEP](ClO 4 ) 2 (|C…
Porphyrin and Phthalocyanine ChemistryHemoglobin structure and functionPorphyrin Metabolism and Disorders
Sarah L. Clark、Martha F. Montague、Paula T. Hammond1997-11-01Macromolecules
A new method for the patterning of ionic layer-by-layer assembled films with micron-sized features is presented. Self-assembled monolayers (SAMs) were used as templates to direct the deposition of sulfonated polystyrene (SPS) and poly(diallyldimethylammonium chloride) (PDAC) multilayers onto a surface. Both polyelectr…
Polymer Surface Interaction StudiesMolecular Junctions and NanostructuresDendrimers and Hyperbranched Polymers
Krzysztof Matyjaszewski、Scott G. Gaynor1997-11-01Macromolecules
The homopolymerization of 2-((2-bromopropionyl)oxy)ethyl acrylate (BPEA) by atom transfer radical polymerization (ATRP), a “living”/controlled radical polymerization system, has yielded a hyperbranched polymer. Variation of the reaction conditions and especially the concentration of copper(II) in the polymerization sy…
Advanced Polymer Synthesis and CharacterizationDendrimers and Hyperbranched PolymersSynthesis and properties of polymers
R. W. Ruhwandl、Eugene M. Terentjev1997-11-01Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
We use a Monte Carlo algorithm to simulate the director field around a spherical inclusion in a uniform nematic liquid crystal matrix. The resulting structure crucially depends on the relative strength of the nematic bulk elasticity and the director anchoring on the particle surface. When this anchoring is weak, the d…
Liquid Crystal Research AdvancementsPhotonic Crystals and ApplicationsAdvanced Materials and Mechanics
Mehmet A. Akbas、Peter K. Davies1997-11-01Journal of the American Ceramic Society
Extensive studies that have been conducted on the Pb(Mg 1/3 Nb 2/3 )O 3 (PMN) family of relaxor ferroelectrics have led to the establishment and acceptance of the“space‐charge” model as a basis for explaining their structures and dielectric properties. In this model, the arrangement of the metal cations on the octahed…
Ferroelectric and Piezoelectric MaterialsMultiferroics and related materialsMicrowave Dielectric Ceramics Synthesis
Kunimitsu Morishige、Keiichi Nobuoka1997-11-01The Journal of Chemical Physics
In order to study the freezing/melting behavior of pore water, we performed x-ray diffraction measurements of water confined inside the cylindrical pores of two kinds of siliceous MCM-41 with different pore size and one kind of aluminosilicate MCM-41 as a function of temperature. The results show that its freezing/mel…
Zeolite Catalysis and SynthesisMesoporous Materials and CatalysisAerogels and thermal insulation
Xiaoping Li、Wei‐Heng Shih1997-11-01Journal of the American Ceramic Society
Clustering has an important effect on the tetragonal‐cubic transformation of barium titanate (BaTiO 3 ) particles. Small particles that would be cubic if they were by themselves can be tetragonal if they are in a cluster. The effects of clustering are shown in the behavior of the c/a ratio of the particles and the ent…
Ferroelectric and Piezoelectric MaterialsMicrowave Dielectric Ceramics SynthesisElectronic and Structural Properties of Oxides
Krzysztof Matyjaszewski、Scott G. Gaynor、Axel H. E. Müller1997-11-01Macromolecules
The self-condensing vinyl polymerization (SCVP) of 2-((2-bromopropionyl)oxy)ethyl acrylate (BPEA) has resulted in the formation of hyperbranched polyacrylates. The polymerization mechanism used to polymerize the BPEA was atom transfer radical polymerization (ATRP), a “living”/controlled radical polymerization. This pa…
Advanced Polymer Synthesis and CharacterizationDendrimers and Hyperbranched PolymersSynthesis and properties of polymers
Huey‐Min Lai、Graciela W. Padua1997-11-01Cereal Chemistry
ABSTRACT A new method for preparation of zein films involving plasticization of zein with oleic acid to form an intermediate moldable resin was presented. The resin was stretched over rigid frames to form thin membranes that were set in flexible films. The objective of the study was to investigate the effect of film p…
Nanocomposite Films for Food PackagingPolymer Surface Interaction StudiesSilk-based biomaterials and applications
San Ping Jiang、S. P. S. Badwal1997-11-01Journal of The Electrochemical Society
H{sub 2} oxidation has been studied for Pt and Ni electrodes for different H{sub 2}/H{sub 2}O ratios at 1,000 C in solid oxide fuel cells using yttria-tetragonal zirconia electrolyte by galvanostatic current interruption and electrochemical impedance spectroscopy. The results clearly indicate that the mechanism and ki…
Electrocatalysts for Energy ConversionAdvancements in Solid Oxide Fuel CellsFuel Cells and Related Materials
Jon‐Paul Strachan、Steve Gentemann、Jyoti Seth 等 7 位作者1997-11-01Journal of the American Chemical Society
The rational design of molecular photonic devices requires a thorough understanding of all factors affecting electronic communication among the various constituents. To explore how electronic factors mediate both excited- and ground-state electronic communication in multiporphyrin arrays, we have conducted a detailed…
Porphyrin and Phthalocyanine ChemistryMolecular Junctions and NanostructuresPhotochemistry and Electron Transfer Studies
Bruce Dunn、Jeffrey I. Zink1997-11-01Chemistry of Materials
The use of molecular probes to study the nature of the local environment around dopants in silicate sol−gel materials is reviewed. The review selectively focuses on probes of pore solvent composition and molecule−matrix interactions using electronic spectroscopy. The sol−gel environment is complex; to systematize the…
Mesoporous Materials and CatalysisPhotochemistry and Electron Transfer StudiesAnalytical Chemistry and Sensors
Robert V. Slone、Joseph T. Hupp1997-11-01Inorganic Chemistry
Luminescent multiporphyrin molecular square assemblies have been synthesized in high yield from Re(CO)5Cl and a highly soluble dipyridylporphyrin ligand. Both free-base and ZnII-metalated variants of squares have been synthesized. The ZnII-containing squares are capable of strongly binding selected polyimine ligands i…
Molecular Sensors and Ion DetectionSupramolecular Chemistry and ComplexesPorphyrin and Phthalocyanine Chemistry
Peter G. C. Campbell、Michael R. Twiss、Kevin J. Wilkinson1997-11-01Canadian Journal of Fisheries and Aquatic Sciences
Reference humic substances (fulvic and humic acid) were used to demonstrate the adsorption of natural dissolved organic marter (DOM) onto the surfaces of phytoplankton (<i>Chlorella pyrenoidosa</i>, <i>Synechococcus leopoliensis</i>) and isolated fish gill cells (<i>Salmo salar</i>)…
Marine and coastal ecosystemsAlgal biology and biofuel productionDiatoms and Algae Research
Zheyuan Huang、Pen‐Cheng Wang、Alan G. MacDiarmid 等 5 位作者1997-11-01Langmuir
This paper describes the use of patterned self-assembled monolayers (SAMs) in area-selective deposition of conducting polymers (polypyrrole and polyaniline) on insulating, hydroxyl-terminated surfaces such as Si/SiO 2 and glass. Patterned SAMs of octadecylsiloxane were generated on the hydroxyl-terminated surfaces usi…
Advanced Sensor and Energy Harvesting MaterialsConducting polymers and applicationsMolecular Junctions and Nanostructures
Ravi Srinivasan、I‐Ming Hsing、Peter E. Berger 等 9 位作者1997-11-01AIChE Journal
Abstract Silicon‐based microfabrication of a novel chemical reactor (microreactor) having submillimeter flow channels with integrated heaters, and flow and temperature sensors is described. The potential application of this reactor to partial‐oxidation reactions is explored by using Pt‐catalyzed NH 3 oxidation as a mo…
Electrocatalysts for Energy ConversionCatalytic Processes in Materials ScienceSemiconductor materials and devices
K. Vijaya Sarathy、Gargi Raina、Ramkuber T. Yadav 等 5 位作者1997-11-01The Journal of Physical Chemistry B
A simple procedure has been developed to prepare thiol-derivatized nanoparticles of metals. The procedure involves the transfer of well-characterized metal hydrosols to a hydrocarbon medium containing the thiol. Thiol-derivatized nanoparticles Au, Ag, and Pt of near spherical shape forming nanocrystalline arrays have…
Gold and Silver Nanoparticles Synthesis and ApplicationsQuantum Dots Synthesis And PropertiesNanocluster Synthesis and Applications
Keiko A. Koyano、Takashi Tatsumi、Yoshinori Tanaka 等 4 位作者1997-11-01The Journal of Physical Chemistry B
The stability of Si-MCM-48 to moisture and compression can be improved by trimethylsilylation, as a result of the increase in hydrophobicity. Moreover, the stability is retained after calcination, although the calcined material is no longer hydrophobic. This stabilizing effect was also observed for Si-MCM-41 and Ti-MC…
Metal-Organic Frameworks: Synthesis and ApplicationsZeolite Catalysis and SynthesisMesoporous Materials and Catalysis
D. A. Garanin、Eugene M. Chudnovsky1997-11-01Physical review. B, Condensed matter
The dynamical theory of thermally activated resonant magnetization tunneling in uniaxially anisotropic magnetic molecules such as Mn${}_{12}\mathrm{Ac}$$(S=10)$ is developed. The observed slow dynamics of the system is described by master equations for the populations of spin levels. The latter are obtained by the adi…
Magnetism in coordination complexesLanthanide and Transition Metal ComplexesElectron Spin Resonance Studies