Biswajit Choudhury、Alan C. Weedon、James R. Bolton1998-09-25Langmuir
The photoelectrochemistry of two new groups of surfactant carboxyporphyrins is described. The surface active porphyrins deposited onto a SnO 2 semiconductor surface exhibit an unusual photoelectrochemical effect: a substantial and stable photocurrent/photovoltage is generated in modified photoelectrode cells that poss…
Photosynthetic Processes and MechanismsPorphyrin and Phthalocyanine ChemistryPhotochemistry and Electron Transfer Studies
Zhaohui Lei、Anand S. Vaidyalingam、Prabir K. Dutta1998-09-25The Journal of Physical Chemistry B
Photochemical studies of molecules in the organized voids of microporous frameworks is an area of considerable research interest. In this study, we have examined the spectroscopy and photochemistry of trans -azobenzene introduced into the 8 Å channels of an aluminophosphate framework, AlPO 4 -5. The acidity of alumino…
Advanced Photocatalysis TechniquesPolyoxometalates: Synthesis and ApplicationsCovalent Organic Framework Applications
Enos A. Axtell、Ju‐Hsiou Liao、Mercouri G. Kanatzidis1998-09-25Inorganic Chemistry
From the reaction of Au with alkali metal polysulfide liquids, LiAuS and NaAuS were discovered. Orange crystals of LiAuS crystallize in the monoclinic space group C2/c, (no. 15), with a = 8.994(2) Å, b = 8.956(2) Å, c = 7.201(3) Å, beta = 128.68(1) degrees, and Z = 8. Light-yellow planks of NaAuS crystallize in the or…
Rare-earth and actinide compoundsIron-based superconductors researchInorganic Chemistry and Materials
J.A. Halfen、Jeffrey J. Bodwin、Vincent L. Pecoraro1998-09-25Inorganic Chemistry
Chiral 12-metallacrown-4 complexes can now be obtained in high yield using resolved β-phenylalanine hydroxamic acids as organic scaffolding. These new copper(II) compounds bear a striking resemblance based on size and shape to Cu(II) tetraphenylporphyrin. This suggests that metallacrowns may be useful alternatives to…
Magnetism in coordination complexesPorphyrin and Phthalocyanine ChemistrySurface Chemistry and Catalysis
G. E. Welsh、D.J. Blundell、Alan H. Windle1998-09-25Macromolecules
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTA Transient Liquid Crystalline Phase as a Precursor for Crystallization in Random Co-polyester FibersG. E. Welsh, D. J. Blundell, and A. H. WindleView Author Information Department of Materials Science and Metallurgy, University of…
Liquid Crystal Research AdvancementsTextile materials and evaluationsMaterial Properties and Processing
Shiou‐Jyh Hwu1998-09-25Chemistry of Materials
In an attempt to abstract the structural units of widely known silicate, phosphate, and arsenate compounds based on a transition-metal oxide (TM oxide) framework, we have gained some new insight into the study of “nanostructured” materials and their corresponding electronic and magnetic properties. In this review, we…
Luminescence Properties of Advanced MaterialsCrystal Structures and PropertiesAdvanced Condensed Matter Physics
Kazuyuki Ishii、Yoshiharu Hirose、Nagao Kobayashi1998-09-25Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSelective Population from the Excited Multiplet States to the Triplet Ground State in a Phthalocyanine: A New Concept for Controlling Magnetic Properties by PhotoexcitationKazuyuki Ishii, Yoshiharu Hirose, and Nagao KobayashiView Author Information Department of Chemis…
Magnetism in coordination complexesPorphyrin and Phthalocyanine ChemistrySynthesis and Properties of Aromatic Compounds
Brian K. Hubbard、Marjan Koch、David R. J. Palmer 等 5 位作者1998-09-25Biochemistry
The genes encoding the enzymes in the (D)-glucarate/galactarate catabolic pathway have been identified in the Escherichia coli genome. These encode, in three transcriptional units, (D)-glucarate dehydratase (GlucD), galactarate dehydratase, 5-keto-4-deoxy-(D)-glucarate aldolase, tartronate semialdehyde reductase, a gl…
Bacterial Genetics and BiotechnologyEnzyme Structure and FunctionBiochemical and Molecular Research
Johannes Elschner、G. Schmidt1998-09-25Mathematical Methods in the Applied Sciences
The aim of the paper is to provide the mathematical foundation of effective numerical algorithms for the optimal design of periodic binary gratings. Special attention is paid to reliable methods for the computation of diffraction efficiencies and of the gradients of certain functionals with respect to the parameters o…
Electromagnetic Scattering and AnalysisElectromagnetic Simulation and Numerical MethodsOptical Coatings and Gratings
Christine L. Maupin、David Parker、J. A. Gareth Williams 等 4 位作者1998-09-25Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTCircularly Polarized Luminescence from Chiral Octadentate Complexes of Yb(III) in the Near-InfraredChristine L. Maupin, David Parker, J. A. Gareth Williams, and James P. RiehlView Author Information Department of Chemistry Michigan Technological University 1400 Townsen…
Magnetism in coordination complexesLuminescence and Fluorescent MaterialsLanthanide and Transition Metal Complexes
Loong‐Tak Lim、Yoshinori Mine、Marvin A. Tung1998-09-25Journal of Agricultural and Food Chemistry
A methodology for preparing biodegradable films from egg white proteins was developed in this study. Film formation was based on the partial denaturation of egg white proteins by a preheating treatment at pH 10.5, followed by enzymatic polymerization of the proteins at 50 °C, pH 8.2, using a Ca 2+ -independent microbi…
Proteins in Food SystemsNanocomposite Films for Food PackagingMicroencapsulation and Drying Processes
Arjen Boersma、J. van Turnhout、Michael Wübbenhorst1998-09-25Macromolecules
Dielectric relaxation analysis was carried out on the main chain thermotropic liquid crystalline copolyesteramide Vectra B950. The dielectric spectra of Vectra B950 show four relaxations, instead of three as cited in the literature. These correspond, from high to low temperature, to the glass transition, the rotation…
Liquid Crystal Research AdvancementsNonlinear Optical Materials ResearchMolecular spectroscopy and chirality
A. Hucht、K. D. Usadel1998-09-25arXiv
The reorientation transition of the magnetization of ferromagnetic films is studied on a microscopic basis within Heisenberg spin models. Analytic expressions for the temperature dependent anisotropy are derived from which it is seen that the reduced magnetization in the film surface at finite temperatures plays a cru…
Materials Sciencecond-mat.stat-mech
F. J. Solis、M. Olvera de la Cruz1998-09-25arXiv
We analyze, by means of an RPA calculation, the conditions under which a mixture of oppositely charged polyelectrolytes can micro-segregate in the neighborhood of a charged surface creating a layered structure. A number of stable layers can be formed if the surface is sufficiently strongly charged even at temperatures…
Materials ScienceSoft Condensed Matter
Warren C. W. Chan、Shuming Nie1998-09-25OpenAlex
Highly luminescent semiconductor quantum dots (zinc sulfide-capped cadmium selenide) have been covalently coupled to biomolecules for use in ultrasensitive biological detection. In comparison with organic dyes such as rhodamine, this class of luminescent labels is 20 times as bright, 100 times as stable against photob…
Advanced biosensing and bioanalysis techniquesQuantum Dots Synthesis And PropertiesAdvanced Biosensing Techniques and Applications
Marcel P. Bruchez、Mario M. Moronne、Peter Gin 等 5 位作者1998-09-25OpenAlex
Semiconductor nanocrystals were prepared for use as fluorescent probes in biological staining and diagnostics. Compared with conventional fluorophores, the nanocrystals have a narrow, tunable, symmetric emission spectrum and are photochemically stable. The advantages of the broad, continuous excitation spectrum were d…
Advanced biosensing and bioanalysis techniquesQuantum Dots Synthesis And PropertiesNanocluster Synthesis and Applications
Anthony Guiseppi‐Elie、Ann M. Wilson、Andrew S. Sujdak1998-09-24ACS symposium series
We have synthesized highly hydrophilic, chemically responsive materials we call electroconductive gels. They are formed as an interpenetrating network of an electroconductive polymer and a hydrophilic hydrogel. Polymers were formulated form UV polymerizable hydrophilic monomer such as hydroxyethyl methacrylate (HEMA),…
Electrochemical sensors and biosensorsConducting polymers and applicationsAnalytical Chemistry and Sensors
Mingming Guo、William J. Brittain1998-09-24Macromolecules
It is generally agreed in the literature that transesterification leads to or enhances miscibility; that is, transesterification is a necessary condition for miscibility in the polyester blends. We present here, for the first time, indirect and direct experimental evidence to prove that this statement is not completel…
Polymer crystallization and propertiesPolymer Nanocomposites and PropertiesBlock Copolymer Self-Assembly
Véronique Nardello、J. Marko、G. Vermeersch 等 4 位作者1998-09-24Inorganic Chemistry
The disproportionation of aqueous hydrogen peroxide catalyzed by sodium tungstate has been investigated with regard to the multiplicity of the oxygen molecules released. Trapping experiments and detection of the IR luminescence of (1)O(2) have shown that the yield of (1)O(2) is virtually quantitative. The mono-, di-,…
Nanoplatforms for cancer theranosticsPhotodynamic Therapy Research StudiesPolyoxometalates: Synthesis and Applications
Biswajit Choudhury、Alan C. Weedon、James R. Bolton1998-09-24Langmuir
The surface chemistry of two new groups of surfactant carboxyporphyrins is described. These materials exhibit well-behaved monomolecular films at an air−water interface. In compressed monolayers, the porphyrin ring appears to be oriented so that the plane of the ring is perpendicular to the surface. The surface-pressu…
Photosynthetic Processes and MechanismsPorphyrin and Phthalocyanine ChemistryPhotochemistry and Electron Transfer Studies