Yoichiro Ishimaru、Makoto Kitano、Harumi Kumada 等 5 位作者1998-04-11Inorganic Chemistry
Complexes of bis(hexafluoroacetylacetonato)copper(II) [Cu(hfac)(2)] ligated with 3- and 4-(N-oxyl-tert-butylamino)pyridines (3NOPy and 4NOPy) and N-{3- and 4-(N-oxyl-tert-butylamino)phenyl}imidazoles (3NOIm and 4NOIm) were prepared. The 1:2 complexes [Cu(hfac)(2)(3NOPy and 4NOPy)(2)] have hexacoordinated octahedral st…
Magnetism in coordination complexesLanthanide and Transition Metal ComplexesElectron Spin Resonance Studies
Vishal Bansal、Robert L. Shambaugh1998-04-11Industrial & Engineering Chemistry Research
An on-line experimental technique was developed for the measurement of fiber diameter and temperature during the melt-blowing process. The experimentally determined diameters and temperatures were compared with a mathematical model for melt-blowing.
High voltage insulation and dielectric phenomena
Mei‐Rong Huang、Xin‐Gui Li1998-04-11Journal of Applied Polymer Science
Cellulose, cellulose diacetate (CDA), cellulose triacetate (CTA), cellulose nitrate (CN), and cellulose phosphate (CP) were subjected to dynamic thermogravimetry in nitrogen and air. The thermostability of the cellulose and its esters was estimated, taking into account the values of initial thermal degradation tempera…
Polymer Nanocomposites and PropertiesAdvanced Cellulose Research StudiesPolymer Science and PVC
Stephan L. Logunov、Tyler P. Green、Sylvie Marguet 等 4 位作者1998-04-11The Journal of Physical Chemistry A
The relaxation dynamics of charge carriers in 4 nm CdS colloidal quantum dots are studied by means of picosecond time-resolved fluorescence and femtosecond transient absorption experiments. We also studied the effects of the adsorption of viologen derivatives as electron acceptors on the surface of these particles. Fr…
Gold and Silver Nanoparticles Synthesis and ApplicationsQuantum Dots Synthesis And PropertiesChalcogenide Semiconductor Thin Films
Akira Shimizu、Teruaki Okushima、Kazuki Koshino1998-04-11arXiv
Using microscopic models in which both photons and excitons are treated as microscopic degrees of freedom, we discuss polaritons of two cases: One is the case when excitonic parameters are time dependent. The time dependence causes creation of polaritons from a "false vacuum." % We present the creation spectra of both…
Materials Sciencephysics.opticsquant-ph
Akira Shimizu、Masamichi Yamanishi1998-04-11arXiv
We consider generation of an electrical pulse by an optical pulse in the ``virtual excitation'' regime. The electronic system, which is any electro-optic material including a quantum well structure biased by a dc electric field, is assumed to be coupled to an external circuit. It is found that the photon frequency is…
Materials Sciencephysics.opticsquant-ph
Dawn A. Bonnell1998-04-10Acta Materialia
The electronic properties of metal-ceramic interfaces are found to vary with the size of the interface in the range of 3–100 nm. Interface properties can be extracted from variations in apparent heights of metal clusters, as measured by scanning tunneling microscopy, of small clusters on atomically smooth oxide surfac…
Catalytic Processes in Materials ScienceElectronic and Structural Properties of OxidesSurface and Thin Film Phenomena
Véronique Receveur‐Brechot、D. Durand、Michel Desmadril 等 4 位作者1998-04-10FEBS Letters
In order to investigate the effect of concentration in biological processes such as protein folding, small angle neutron scattering measurements were used to determine the second virial coefficient of solutions of both native and strongly denatured phosphoglycerate kinase and the radius of gyration of the protein at z…
Protein Structure and DynamicsProtein purification and stabilityEnzyme Structure and Function
Steven J. Taylor、James P. Morken1998-04-10Science
A general method is introduced for the rapid and simultaneous evaluation of each member of large encoded catalyst libraries for the ability to catalyze a reaction in solution. The procedure was used to select active catalysts from a library of potential polymer-bound multifunctional catalysts. From approximately 7000…
Computational Drug Discovery MethodsChemical Synthesis and AnalysisMachine Learning in Materials Science
Kwon Yon Musick、Qiao‐Sheng Hu、Lin Pu1998-04-09Macromolecules
Copolymers of 1,1‘-binaphthyl and oligothiophenes have been synthesized by using the Suzuki coupling reaction. These polymers are soluble in organic solvents such as chloroform and THF. The higher molecular weight polymers have shown high thermal stability. These binaphthyl−thiophene copolymers have well-defined conju…
Organic Electronics and PhotovoltaicsConducting polymers and applicationsLuminescence and Fluorescent Materials
Oskar Liivak、Amy Blye、Neeral Shah 等 4 位作者1998-04-09Macromolecules
A microfabricated spinneret is described that is capable of spinning meters of fibers from solutions containing as little as 10 mg of purified protein. Using the spinneret, regenerated Bombyx mori fibers were made using various processing parameters. A log−linear relationship was found between the maximum stress susta…
Electrospun Nanofibers in Biomedical ApplicationsViral Infectious Diseases and Gene Expression in InsectsSilk-based biomaterials and applications
Burak Erman、James E. Mark1998-04-08Macromolecules
Polymer networks having a bimodal distribution of network chain lengths can be prepared by end-linking two sets of chains having different molecular weights. These unusual elastomers frequently have better mechanical properties than those having a unimodal distribution, which suggests that trimodal distributions could…
Structural Behavior of Reinforced ConcretePolymer Nanocomposites and PropertiesPolymer composites and self-healing
Jerry L. Reddinger、John R. Reynolds1998-04-08Chemistry of Materials
We report a series of novel bis(salicylidene) metal complexes that undergo oxidative electropolymerization to afford polymers comprised of three different backbone constitutions and a variety of film colors. The ligand architecture, being either N, N ‘-bis(salicylidene)-3,4-diaminothiophene (SALOTH) or N, N ‘-bis(sali…
Conducting polymers and applicationsPorphyrin and Phthalocyanine ChemistryPolyoxometalates: Synthesis and Applications
David S. Hays、Gregory C. Fu1998-04-08The Journal of Organic Chemistry
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTDevelopment of Bu3SnH-Catalyzed Processes: Efficient Reduction of Azides to AminesDavid S. Hays and Gregory C. FuView Author Information Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 Cite this: J. Org. Chem. 1998, 63, 9,…
Machine Learning in Materials ScienceAdvanced Materials Characterization Techniques
Sanjay Rastogi、Han Goossens、P. J. Lemstra1998-04-08Macromolecules
In situ small- and wide-angle X-ray scattering (SAXS and WAXS) experiments combined with Raman spectroscopy and thermal analysis have been performed to study the phase behavior of syndiotactic polystyrene (sPS) solutions. Three different solvents were used, respectively, decalin, benzyl methacrylate, and cyclohexyl me…
Polymer crystallization and propertiesPolymer Nanocomposites and PropertiesEpoxy Resin Curing Processes
Steven Zabarnick1998-04-08Energy & Fuels
Chemical kinetic modeling was used to simulate the autoxidation of jet fuel including the chemistry of peroxy radical inhibiting antioxidants and hydroperoxide decomposing species. Recent experimental measurements of oxygen concentration during autoxidation of model hydrocarbon solvents were used to “calibrate” the ra…
Spectroscopy and Quantum Chemical StudiesThermal and Kinetic AnalysisChemical Thermodynamics and Molecular Structure
Brian K. Schroth、Garrison Sposito1998-04-08Environmental Science & Technology
Hexanoic (hex) and fulvic acid (FA), representing early and later stages of landfill leachate evolution, were examined for influence on trace metal adsorption by a poorly crystal lized kaolinite (KGa-2). Our experiments represented a model approach to examine possible reaction mechanisms in an environmentally importan…
Heavy metals in environmentClay minerals and soil interactionsMine drainage and remediation techniques
J. Araña、Pilar Ramı́rez de la Piscina、Jordi Llorca 等 6 位作者1998-04-08Chemistry of Materials
Silica-supported bimetallic MSn (M = Ni, Pd, Pt) samples have been prepared by two consecutive impregnation steps with solutions of [MCl 2 (PPh 3 ) 2 ] complexes and SnCl 2, respectively. After treatment in H 2 at 673 K, these materials were characterized in detail by X-ray diffraction (XRD), conventional transmission…
Catalytic Processes in Materials ScienceSemiconductor materials and devicesElectronic and Structural Properties of Oxides
Eric Cockayne、Karin M. Rabe1998-04-08arXiv
In this article, we motivate the detailed comparison of the physical properties of individual configurations of a ferroelectric solid solution as a means toward developing first principles models for these systems. We compare energies, dielectric constants epsilon_infinity, mode effective charges of local polar distor…
Materials Science
A. Tanguy、M. Gounelle、S. Roux1998-04-08arXiv
We study the effect of long-range elastic interactions in the dynamical behavior of an elastic chain driven quasi-statically in a quenched random pinning potential and in the strong pinning limit. This is a generic situation occuring in solid friction, crack propagation, wetting front motion, ... Tuning the exponent o…
cond-mat.dis-nnMaterials ScienceSoft Condensed Matter