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Cationic, water‐soluble, fluorene‐containing poly(arylene ethynylene)s: Effects of water solubility on aggregation, photoluminescence efficiency, and amplified fluorescence quenching in aqueous solutions

Yan‐Qin Huang、Quli Fan、Xiaomei Lü 等 8 位作者2006-08-25Journal of Polymer Science Part A Polymer Chemistry

Abstract Three novel fluorene‐containing poly(arylene ethynylene)s with amino‐functionalized side groups were synthesized through the Sonogashira reaction. They were poly{9,9‐bis[6′‐( N,N ‐diethylamino)hexyl]‐2,7‐fluorenylene ethynylene}‐ alt ‐ co ‐{2,5‐bis[3′‐( N,N ‐diethylamino)‐1′‐oxapropyl]‐1,4‐phenylene} ( P1 ),…

Perovskite Materials and ApplicationsOrganic Light-Emitting Diodes ResearchLuminescence and Fluorescent Materials

Synthesis and Characterization of Biocompatible Polymer Interlayers on Titanium Implant Materials

Nina Adden、Lara J. Gamble、David G. Castner 等 6 位作者2006-08-25Biomacromolecules

A bifunctional copolymer series of (4-vinylbenzyl)phosphonic acid diethylester and N-acryloxysuccinimide was developed as an interlayer with the aim of immobilizing proteins on titanium surfaces. Copolymers with varying compositions were synthesized, and an alternating copolymerization of the two monomers was found. T…

Polymer Surface Interaction StudiesMolecular Junctions and NanostructuresForce Microscopy Techniques and Applications

Nanoscale Silica Capsules Ordered on a Substrate: Oxidation of Nanocellular Thin Films of Poly(styrene‐b‐dimethylsiloxane)

Lei Li、Hideaki Yokoyama2006-08-25Angewandte Chemie International Edition

Small capsules: Nanoscale silica capsules can be synthesized by the oxidation of nanoscale bubbles in the poly(dimethylsiloxane) domains of poly(styrene-b-dimethylsiloxane). These nanobubbles are introduced by a process involving supercritical carbon dioxide. The nanocapsules are opened up after dry etching (see AFM i…

Mesoporous Materials and CatalysisPolymer Surface Interaction StudiesPickering emulsions and particle stabilization

A Photoswitchable Miniprotein Based on the Sequence of Avian Pancreatic Polypeptide

Simon Jurt、Andreas Aemissegger、Peter Güntert 等 5 位作者2006-08-25Angewandte Chemie International Edition

Flip a switch: A peptide capable of adopting different conformations is constructed upon insertion of an azobenzene linker into the polypeptide backbone. A simple transformation (irradiation or heating) can be used to switch from one form to the other.

Chemical Synthesis and AnalysisSupramolecular Self-Assembly in MaterialsPhotochromic and Fluorescence Chemistry

Nucleation and growth of droplets at a liquid-gas interface

Alexander Nepomnyashchy、A. A. Golovin、A. E. Tikhomirova 等 4 位作者2006-08-25Physical Review E

The nucleation of liquid droplets at a liquid-gas interface from a saturated vapor in the gas phase, as well as the droplet growth after the nucleation are studied. These two processes determine the formation of a regular hexagonal array of drops on the surface of an evaporating film of polymer solution that is used f…

Block Copolymer Self-AssemblyFluid Dynamics and Thin Filmsnanoparticles nucleation surface interactions

A Depth‐Resolved In‐Situ Study of the Reduction and Oxidation of Ni‐Based Anodes in Solid Oxide Fuel Cells

Anke Hagen、Henning Friis Poulsen、Trine Klemenso̸ 等 7 位作者2006-08-25Fuel Cells

Abstract The stability of Ni‐YSZ anodes as part of solid oxide fuel cells (SOFCs) towards redox cycling is an important issue for successfully introducing the technology. Detailed knowledge of the NiO‐Ni transitions and their impact on the mechanical integrity of the whole system is necessary to improve the overall st…

Advancements in Solid Oxide Fuel CellsMagnetic and transport properties of perovskites and related materialsElectronic and Structural Properties of Oxides

Computational Model for Transport in Nanotube-Based Composites With Applications to Flexible Electronics

Satish Kumar、Muhammad A. Alam、Jayathi Y. Murthy2006-08-25ASME Journal of Heat and Mass Transfer

Thermal and electrical transport in a new class of nanocomposites composed of random isotropic two-dimensional ensembles of nanotubes or nanowires in a substrate (host matrix) is considered for use in the channel region of thin-film transistors (TFTs). The random ensemble of nanotubes is generated numerically and each…

Organic Electronics and PhotovoltaicsCarbon Nanotubes in CompositesThermal properties of materials

Poly(DEAEMa-co-PEGMa): A New pH-Responsive Comb Copolymer Stabilizer for Emulsions and Dispersions

Sheikh Shahalom、Tony Tong、Simon Emmett 等 4 位作者2006-08-25Langmuir

Stimulus responsive copolymers are an important class of surfactants that are attracting growing attention in the literature. When used to stabilize colloids, they confer responsiveness to an otherwise nonresponsive system. In this work, a new pH-responsive comb copolymer surfactant, poly(DEAEMa-co-PEGMa), where DEAEM…

Advanced Polymer Synthesis and CharacterizationSurfactants and Colloidal SystemsPickering emulsions and particle stabilization

Polymer Films on Electrodes: Investigation of Ion Transport at Poly(3,4-ethylenedioxythiophene) Films by Scanning Electrochemical Microscopy

Nianjun Yang、Cynthia G. Zoski2006-08-25Langmuir

Electropolymerization, morphology characterization, and ion transport of poly(3,4-ethylenedioxythiophene) (PEDOT) films doped with different counterions (chloride, ferrocyanide (FCN), and poly(p-styrenesulfonate) (PSS-)) on a platinum electrode were investigated using scanning electrochemical microscopy (SECM) during…

Conducting polymers and applicationsElectrochemical Analysis and ApplicationsAnalytical Chemistry and Sensors

Drug loading of nanoporous TiO 2 films

Arturo A. Ayón、Michael Cantu、Kalpana Chava 等 9 位作者2006-08-25Biomedical Materials

The loading of therapeutic amounts of drug on a nanoporous TiO(2) surface is described. This novel drug-loading scheme on a biocompatible surface, when employed on medical implants, will benefit patients who require the deployment of drug-eluting implants. Anticoagulants, analgesics and antibiotics can be considered o…

Nanoparticle-Based Drug DeliveryCatalytic Processes in Materials ScienceMesoporous Materials and Catalysis

Mechanical Properties of Polyelectrolyte Complex Films Based on Polyvinylamine and Carboxymethyl Cellulose

Xianhua Feng、Robert Pelton、Marc Leduc2006-08-25Industrial & Engineering Chemistry Research

Homogeneous polyelectrolyte complex films were cast from mixtures of poly(vinylamine- co -vinylformamide) and carboxymethyl cellulose (CMC) in 50% formic acid aqueous solution with compositions varying between CMC blended with pure polyvinylamine (PVAm) and CMC blended with pure poly( N -vinylformamide) (PNVF). The te…

biodegradable polymer synthesis and propertiesElectrospun Nanofibers in Biomedical ApplicationsPolymer Surface Interaction Studies

In Situ Fabrication of A Water-Soluble, Self-Doped Polyaniline Nanocomposite: The Unique Role of DNA Functionalized Single-Walled Carbon Nanotubes

Yufeng Ma、Shah Raj Ali、Ling Wang 等 6 位作者2006-08-25Journal of the American Chemical Society

Dispersion of carbon nanotubes into solvents affects their surface chemistries, electronic structures, and subsequent functionalization. In this Communication, a water-soluble self-doped polyaniline nanocomposite was fabricated by in situ polymerization of the 3-aminophenylboronic acid monomers in the presence of sing…

Organic Electronics and PhotovoltaicsElectrochemical sensors and biosensorsConducting polymers and applications

Electronic Phase Separation in Correlated Oxides: The Phenomenon, Its Present Status and Future Prospects

Vijay B. Shenoy、D. D. Sarma、C. N. R. Rao2006-08-25ChemPhysChem

Many transition metal oxide materials of high chemical purity are not necessarily monophasic. Thus, single crystals of chemically pure rare earth manganites and cobaltates of the general formula Ln(1-x)A(x)MO(3) (Ln=rare earth metal, A=alkaline earth metal, M=Mn, Co) exhibit the phenomenon of electronic phase separati…

Magnetic and transport properties of perovskites and related materialsAdvanced Condensed Matter PhysicsElectronic and Structural Properties of Oxides

Photon Counting Statistics for Blinking CdSe−ZnS Quantum Dots: A Lévy Walk Process

G. Margolin、V. Protasenko、M. Kuno 等 4 位作者2006-08-25The Journal of Physical Chemistry B

We analyze photon statistics of blinking CdSe-ZnS nanocrystals interacting with a continuous wave laser field, showing that the process is described by a ballistic Lévy walk. In particular, we show that Mandel's Q parameter, describing the fluctuations of the photon counts, is increasing with time even in the limit of…

Quantum Dots Synthesis And Propertiesstochastic dynamics and bifurcationRandom lasers and scattering media

First Isolation of Individual Silicate Platelets from Clay Exfoliation and Their Unique Self-Assembly into Fibrous Arrays

Jiang‐Jen Lin、Chien‐Chia Chu、Ming‐Li Chiang 等 4 位作者2006-08-25The Journal of Physical Chemistry B

Thin silicate platelets in a dimension of approximately 80 x 80 x 1 nm(3) are isolated for the first time by a newly developed process involving one-step exfoliation of natural montmorillonite clay and toluene/aqueous NaOH extraction. The platelets are observed to be polygon shape by transmission electron microscopy (…

Polymer Nanocomposites and PropertiesMesoporous Materials and CatalysisClay minerals and soil interactions

Effect of thickness on the stability of transparent conducting impurity‐doped ZnO thin films in a high humidity environment

Tadatsugu Minami、Toshihiro Miyata、Y. Ohtani 等 4 位作者2006-08-25physica status solidi (RRL) - Rapid Research Letters

Abstract The resistivity of transparent conducting Al‐ and Ga‐doped ZnO (AZO and GZO) thin films prepared with a thickness in the range from 20 to 200 nm on glass substrates at a temperature below 200 °C was found to increase with exposure time when tested in a high humidity environment (air at 90% relative humidity a…

ZnO doping and propertiesThin-Film Transistor TechnologiesCopper-based nanomaterials and applications

Excitation mechanisms of individualCdTe∕ZnTequantum dots studied by photon correlation spectroscopy

J. Suffczyński、T. Kazimierczuk、M. Goryca 等 12 位作者2006-08-25Physical Review B

Systematic measurements of auto- and cross-correlations of photons emitted from individual $\mathrm{Cd}\mathrm{Te}∕\mathrm{Zn}\mathrm{Te}$ quantum dots under pulsed excitation were used to elucidate nonresonant excitation mechanisms in this self-assembled system. Memory effects extending over a few excitation pulses h…

Quantum Dots Synthesis And PropertiesChalcogenide Semiconductor Thin FilmsAdvanced Semiconductor Detectors and Materials

Frustration-Induced Valence-Bond Ordering in a New Quantum Triangular Antiferromagnet Based on [Pd(dmit)2]

Masafumi Tamura、Akiko Nakao、Reìzo Kato2006-08-25Journal of the Physical Society of Japan

The temperature dependence of magnetic susceptibility, χ( T ), of the P 2 1 / m crystal of a novel [Pd(dmit) 2 ] salt, (C 2 H 5 )(CH 3 ) 3 P[Pd(dmit) 2 ] 2 , has been measured. The observed χ( T ) above 30 K is reproduced by the model of a spin-1/2 Heisenberg antiferromagnet on a triangular lattice with the exchange c…

Physics of Superconductivity and MagnetismMagnetism in coordination complexesOrganic and Molecular Conductors Research

Synthetic Strategies and Structural Aspects of Metal-Mediated Multiporphyrin Assemblies

Elisabetta Iengo、Ennio Zangrando、Enzo Alessio2006-08-25Accounts of Chemical Research

Porphyrins play a major role as active chromophores in artificial systems mimicking the natural photoinduced processes. The formation of coordination bonds between peripheral donor sites on the porphyrins and external metal fragments has proven to be an efficient alternative to covalent synthesis for the construction…

Photosynthetic Processes and MechanismsPorphyrin and Phthalocyanine ChemistrySurface Chemistry and Catalysis

Organometallic Hydroxides of Transition Elements

Herbert W. Roesky、Sanjay Singh、K. K. Mohammed Yusuff 等 5 位作者2006-08-25Chemical Reviews

Northern Illinois University DeKalb,Institut fu¨r Anorganische Chemie & Southern Methodist University

Polyoxometalates: Synthesis and ApplicationsChemical Synthesis and ReactionsVanadium and Halogenation Chemistry