Advanced Functional Materials

Cover image for Vol. 16 Issue 16

October, 2006

Volume 16, Issue 16

Pages 2049–2178

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Editorial
    5. Feature Article
    6. Full Papers
    7. Index
    1. Cover Picture: Controlled Encapsulation of Hydrophobic Liquids in Hydrophilic Polymer Nanofibers by Co-electrospinning (Adv. Funct. Mater. 16/2006)

      J. E. Díaz, A. Barrero, M. Márquez and I. G. Loscertales

      Article first published online: 16 OCT 2006 | DOI: 10.1002/adfm.200690056

      Co-electrospinning of a hydrophilic polymer and a hydrophobic fluid (oil) results in fabrication of beaded micro- and nanofibers (see figure) with the oil efficiently encapsulated inside the beads. The bead size is rather uniform, with either a monomodal or a bimodal distribution. The “load” of oil can be simply adjusted by controlling the fluid flow rates.

  2. Contents

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Editorial
    5. Feature Article
    6. Full Papers
    7. Index
    1. Contents: Adv. Funct. Mater. 16/2006 (pages 2049–2055)

      Article first published online: 16 OCT 2006 | DOI: 10.1002/adfm.200690054

  3. Editorial

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Editorial
    5. Feature Article
    6. Full Papers
    7. Index
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      Hitting the Mark (pages 2057–2058)

      K. Grieve

      Article first published online: 16 OCT 2006 | DOI: 10.1002/adfm.200600868

      Mark of excellence: Advanced Functional Materials has enjoyed another remarkable year, with all critical indicators pointing to ever-improving quality and importance. In this Editorial, the Deputy Editor outlines the factors that allow the journal to continue to hit its target of publishing in-depth reports on the highest-quality materials science.

  4. Feature Article

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Editorial
    5. Feature Article
    6. Full Papers
    7. Index
    1. Theoretical Design of Catalysts for the Heterolytic Splitting of H2 (pages 2061–2076)

      Ł. Maj and W. Grochala

      Article first published online: 15 SEP 2006 | DOI: 10.1002/adfm.200500891

      Thumbnail image of graphical abstract

      The theoretical design of catalysts to accelerate the sluggish charge/discharge kinetics of lightweight hydrogen storage materials is addressed. Density functional theory calculations show that compounds with the coordinatively unsaturated > Ti[DOUBLE BOND] Si < unit depicted in the figure exhibit favorable thermodynamics and a very low barrier for heterolytic H2 addition, and can thus serve as novel H2 transfer catalysts for selected proton–hydride hydrogen storage systems.

  5. Full Papers

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Editorial
    5. Feature Article
    6. Full Papers
    7. Index
    1. Sub-kilogram-Scale One-Pot Synthesis of Highly Luminescent and Monodisperse Core/Shell Quantum Dots by the Successive Injection of Precursors (pages 2077–2082)

      J. I. Kim and J.-K. Lee

      Article first published online: 7 SEP 2006 | DOI: 10.1002/adfm.200600291

      Thumbnail image of graphical abstract

      A one-pot synthesis of highly luminescent core/shell quantum dots is devised based on the successive injection of precursors, without the need to purify any intermediates. CdSe cores are encapsulated within a ZnSe shell or a double-layer ZnSe/ZnS shell, and these core/shell nanoparticles can readily be made water soluble by exchanging the surface ligands. Significantly, this synthesis is readily scalable to sub- kilogram quantities (see figure).

    2. Fabrication of Organized Porphyrin-Nanotube-Attached Heat-Sensitive Polyelectrolyte Capsules (pages 2083–2088)

      S. Sadasivan, K. Köhler and G. B. Sukhorukov

      Article first published online: 15 SEP 2006 | DOI: 10.1002/adfm.200600189

      Thumbnail image of graphical abstract

      Polyelectrolyte capsules with attached fluorescent porphyrin nanotubes (see figure) have been prepared by a facile method. Aggregation of porphryins to form nanotubes is carried out in the microenvironments of the polyelectrolyte capsules to obtain hollow shells with radially emerging porphyrin nanotubes. Such nanotubes can act as optical waveguides, and the entire nanotube/microcapsule system should mimic the architecture of chlorosomes.

    3. A Supramolecular Chiroptical Switch Using an Amorphous Azobenzene Polymer (pages 2089–2094)

      M. J. Kim, S. J. Yoo and D. Y. Kim

      Article first published online: 19 SEP 2006 | DOI: 10.1002/adfm.200600130

      Thumbnail image of graphical abstract

      Elliptically polarized light (EPL) induces long-range chiral alignment of azobenzenes in an amorphous polymer matrix. The induced supramolecular helical orientation is reversibly switched by alternately irradiating the film with right- and left-handed EPL from a visible laser, as depicted schematically in the figure. The fatigue resistance of the chiroptical switching response is seen to vary with the absorption wavelength.

    4. Electronic Formulations—Photopatterning of Luminescent Conjugated Polymers (pages 2095–2102)

      O. Solomeshch, V. Medvedev, P. R. Mackie, D. Cupertino, A. Razin and N. Tessler

      Article first published online: 19 SEP 2006 | DOI: 10.1002/adfm.200600146

      Thumbnail image of graphical abstract

      Guidelines for creating electronic formulations that can be used in organic light-emitting diode materials are presented. This concept is used to produce a formulation that is compatible with a family of electroluminescent poly(phenylenevinylene) polymers, rendering them photocrosslinkable. The patterning ability is shown via the construction of a single pixel that is half green and half orange.

    5. Patterned Color and Fluorescent Images with Polydiacetylene Supramolecules Embedded in Poly(vinyl alcohol) Films (pages 2103–2109)

      J.-M. Kim, Y. B. Lee, S. K. Chae and D. J. Ahn

      Article first published online: 19 SEP 2006 | DOI: 10.1002/adfm.200600039

      Thumbnail image of graphical abstract

      Selective UV irradiation of poly(vinyl alcohol) films containing diacetylene monomer through a photomask results in the generation of color (without heating) and both color and fluorescent images (after heating). Patterned two-color (blue and red) images in the polymer film are readily obtained (see figure) by a sequential process of photomasked irradiation, heating, and unmasked irradiation.

    6. Controlled Encapsulation of Hydrophobic Liquids in Hydrophilic Polymer Nanofibers by Co-electrospinning (pages 2110–2116)

      J. E. Díaz, A. Barrero, M. Márquez and I. G. Loscertales

      Article first published online: 19 SEP 2006 | DOI: 10.1002/adfm.200600204

      Thumbnail image of graphical abstract

      Co-electrospinning of a hydrophilic polymer and a hydrophobic fluid (oil) results in fabrication of beaded micro- and nanofibers (see figure) with the oil efficiently encapsulated inside the beads. The bead size is rather uniform, with either a monomodal or a bimodal distribution. The “load” of oil can be simply adjusted by controlling the fluid flow rates.

    7. Effects of Photo-oxidation on the Performance of Poly[2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylene vinylene]:[6,6]-Phenyl C61-Butyric Acid Methyl Ester Solar Cells (pages 2117–2126)

      R. Pacios, A. J. Chatten, K. Kawano, J. R. Durrant, D. D. C. Bradley and J. Nelson

      Article first published online: 19 SEP 2006 | DOI: 10.1002/adfm.200500714

      Thumbnail image of graphical abstract

      Organic photovoltaic devices are susceptible to photodegradation (see figure) under exposure to oxygen. This study analyzes the effect of photodegradation on the key processes of light absorption, charge transport, and recombination, and on device performance. Deterioration of charge mobilities is identified as an important factor.

    8. Forces between Surfactant-Coated ZnS Nanoparticles in Dodecane: Effect of Water (pages 2127–2134)

      A. R. Godfrey Alig, M. Akbulut, Y. Golan and J. Israelachvili

      Article first published online: 15 SEP 2006 | DOI: 10.1002/adfm.200500705

      Thumbnail image of graphical abstract

      Trace amounts of water molecules (black in figure) in organic solvent (red) are shown to penetrate the interface between surfactant head groups (green) and ZnS nanoparticles, causing nanoparticle aggregation. The water has a profound effect on the interactions and structure of the nanoparticle assemblies in thin films, which in turn affect their physical properties. These effects should be considered in the design of thin-film processing methodologies.

    9. High-Rate LiFePO4 Electrode Material Synthesized by a Novel Route from FePO4 · 4H2O (pages 2135–2140)

      Y. Wang, J. Wang, J. Yang and Y. Nuli

      Article first published online: 19 SEP 2006 | DOI: 10.1002/adfm.200600442

      Thumbnail image of graphical abstract

      LiFePO4 fine powder with a single olivine phase is synthesized from FePO4 · 4 H2O by a novel route via the intermediate NH4FePO4. As the cathode material for lithium-ion batteries, LiFePO4 containing 2.8 wt % of carbon coating supplies a discharge capacity of 159 mA h g–1 at 0.5 C rate (see figure) and shows large capacities and excellent rechargeability under high-rate conditions.

    10. A Hybrid Supercapacitor Fabricated with a Carbon Nanotube Cathode and a TiO2–B Nanowire Anode (pages 2141–2146)

      Q. Wang, Z. H. Wen and J. H. Li

      Article first published online: 19 SEP 2006 | DOI: 10.1002/adfm.200500937

      Thumbnail image of graphical abstract

      A new hybrid supercapacitor comprising a carbon nanotube (CNT) cathode and a TiO2–B nanowire (TNW) anode is fabricated. The device exhibits the synergistic effects of the two 1D nanomaterials (see figure), and represents a very promising energy-storage system. The energy density of the supercapacitor is comparable to that of an activated-carbon–Li4Ti5O12 supercapacitor, and is twice that of a CNT–CNT supercapacitor. Optimization is ongoing.

    11. Preparation of Near-IR Fluorescent Nanoparticles for Fluorescence-Anisotropy-Based Immunoagglutination Assay in Whole Blood (pages 2147–2155)

      T. Deng, J.-S. Li, J.-H. Jiang, G.-L. Shen and R.-Q. Yu

      Article first published online: 19 SEP 2006 | DOI: 10.1002/adfm.200600149

      Thumbnail image of graphical abstract

      Methylene-blue-doped core/shell near-IR fluorescent nanoparticles showing negligible background fluorescence and low inner-filtration interference in complex biological systems have been prepared (see figure). They are utilized in the development of an immunoagglutination assay method based on fluorescence-anisotropy measurements, used for alpha-fetoprotein detection in whole-blood samples.

    12. Efficient Polymer Electrophosphorescent Devices with Interfacial Layers (pages 2156–2162)

      X. H. Yang, F. Jaiser, B. Stiller, D. Neher, F. Galbrecht and U. Scherf

      Article first published online: 15 SEP 2006 | DOI: 10.1002/adfm.200500834

      Thumbnail image of graphical abstract

      Efficient red-light-emitting phosphorescent polymer diodes have been prepared with insoluble interfacial polymer layers (PFB). A clear correlation between device performance and the energy level positions (see figure) of the interlayer material relative to those of the other components is established, highlighting the importance of electron blocking for achieving efficient electrophosphorescence.

    13. Effects of Structural Variation on the Photocatalytic Performance of Hydrothermally Synthesized BiVO4 (pages 2163–2169)

      J. Yu and A. Kudo

      Article first published online: 15 SEP 2006 | DOI: 10.1002/adfm.200500799

      Thumbnail image of graphical abstract

      Highly crystalline monoclinic scheelite BiVO4powders with variable shapes and morphologies can be selectively synthesized using a hydrothermal process (see figure) over a wide range of pH. The effects of local structural variation on the photocatalytic performance of the synthesized BiVO4 photocatalysts are discussed.

    14. Shape Change and Color Gamut in Gold Nanorods, Dumbbells, and Dog Bones (pages 2170–2176)

      X. Xu and M. B. Cortie

      Article first published online: 15 SEP 2006 | DOI: 10.1002/adfm.200500878

      Thumbnail image of graphical abstract

      The changes in the optical properties of gold nanorods with deviations in shape from prolate ellipsoid to right cylindrical, dumbbell, phi, and dog-bone-like are examined. A broad and flexile color gamut can be obtained (see figure).

  6. Index

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Editorial
    5. Feature Article
    6. Full Papers
    7. Index

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