Advanced Functional Materials

Cover image for Vol. 16 Issue 12

August, 2006

Volume 16, Issue 12

Pages 1521–1642

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Full Papers
    5. Index
    1. Cover Picture: Arresting, Fixing, and Separating Dimers Composed of Uniform Silica Colloidal Spheres (Adv. Funct. Mater. 12/2006)

      M. Ibisate, Z. Zou and Y. Xia

      Article first published online: 25 JUL 2006 | DOI: 10.1002/adfm.200690044

      Silica dimers have been synthesized by adding tetraethylorthosilicate (TEOS) to a colloidal suspension. The TEOS hydrolyzes and condenses to arrest and fix the dimers that result from constant collisions between the spheres. Monodisperse dimers (see figure and cover) with a yield as high as 50 % are routinely obtained. This yield could be increased to 80 % by centrifugation in a density gradient medium.

  2. Contents

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Full Papers
    5. Index
    1. Contents: Adv. Funct. Mater. 12/2006 (pages 1521–1526)

      Article first published online: 25 JUL 2006 | DOI: 10.1002/adfm.200690042

  3. Full Papers

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Full Papers
    5. Index
    1. Production and Potential of Bioactive Glass Nanofibers as a Next-Generation Biomaterial (pages 1529–1535)

      H.-W. Kim, H.-E. Kim and J. C. Knowles

      Article first published online: 27 JUN 2006 | DOI: 10.1002/adfm.200500750

      Thumbnail image of graphical abstract

      Bioactive glass nanofibers with diameters of tens to hundreds of nanometers (84 nm on average, see inset) can be electrospun from a sol–gel solution. The nanofibers exhibit excellent bioactivity, inducing growth of the bone-forming mineral hydroxycarbonate apatite on their surfaces (see figure). Such bioactive nanofibers are therefore considered to be potentially applicable in bone regeneration.

    2. Composite Luminescent Material for Dual Sensing of Oxygen and Temperature (pages 1536–1542)

      S. M. Borisov, A. S. Vasylevska, Ch. Krause and O. S. Wolfbeis

      Article first published online: 28 JUN 2006 | DOI: 10.1002/adfm.200500778

      Thumbnail image of graphical abstract

      Noninvasive, simultaneous temperature and oxygen sensing using luminescent probes incorporated into, respectively, organic copolymer microparticles and a biocompatible hydrogel polymer matrix are described. The material is suitable for temperature-compensated oxygen sensing, and for imaging temperature in the range 0–60 °C. This enables one to “see” (rather than “feel”) temperature in this important range (see figure).

    3. Synthesis of a Hydrothermally Stable, Periodic Mesoporous Material Containing Magnetite Nanoparticles, and the Preparation of Oriented Films (pages 1543–1548)

      M. Alvaro, C. Aprile, H. Garcia and C. J. Gómez-García

      Article first published online: 4 JUL 2006 | DOI: 10.1002/adfm.200500766

      Thumbnail image of graphical abstract

      A hierarchically structured mesoporous silicate containing magnetite nanoparticles is prepared using a task-specific ligand that is able to bind to magnetite and allows interaction with a structure-directing agent (see scheme). Oriented films of this material, which exhibits a remarkable hydrothermal stability, are then easily prepared by using magnetic fields.

    4. Self-Assembly of m-Diethynylbenzene Macrocycles Containing Exoannular Chiral Side Chains (pages 1549–1554)

      Y. Tobe, T. Nagai, S. Araki, T. Ichikawa, A. Nomoto, M. Sonoda and K. Hirose

      Article first published online: 4 JUL 2006 | DOI: 10.1002/adfm.200500306

      Thumbnail image of graphical abstract

      m-Diethynylbenzene macrocycles that have exoannular chiral side chains (see figure) self-assemble both in solution and on the surface of quartz glass to form chiral aggregates. The aggregates are comprised of various hierarchical orders depending on the conditions, and are studied using circular dichroism spectroscopy and atomic force microscopy.

    5. Capillary Force Lithography: Fabrication of Functional Polymer Templates as Versatile Tools for Nanolithography (pages 1555–1565)

      C. M. Bruinink, M. Péter, P. A. Maury, M. de Boer, L. Kuipers, J. Huskens and D. N. Reinhoudt

      Article first published online: 3 JUL 2006 | DOI: 10.1002/adfm.200500629

      Thumbnail image of graphical abstract

      High-resolution polymer templates can be fabricated from micrometer-sized masters by capillary force lithography and applied to the fabrication of stamps for soft lithography, molds for nanoimprint lithography, and etch masks for metals (see figure). The templates permit creation of structures on the 100 nm scale.

    6. The Influence of TiO2 Particle Size in TiO2/CuInS2 Nanocomposite Solar Cells (pages 1566–1576)

      R. O'Hayre, M. Nanu, J. Schoonman, A. Goossens, Q. Wang and M. Grätzel

      Article first published online: 27 JUN 2006 | DOI: 10.1002/adfm.200500647

      Thumbnail image of graphical abstract

      The size of TiO2 particles employed in CuInS2/TiO2 nanocomposite solar cells dramatically influences the photovoltaic performance. Cells built from large (300 nm) TiO2 crystallites significantly outperform cells built from small (9 nm) crystallites (see figure), largely due to the increased transport resistance associated with the small crystallites.

    7. Control and Suppression of Surface Relief Gratings in Liquid-Crystalline Perfluoroalkyl–Azobenzene Polymers (pages 1577–1581)

      F. You, M. Y. Paik, M. Häckel, L. Kador, D. Kropp, H.-W. Schmidt and C. K. Ober

      Article first published online: 3 JUL 2006 | DOI: 10.1002/adfm.200500711

      Thumbnail image of graphical abstract

      Surface relief gratings (SRGs, figure right) have been developed using semifluorinated azobenzene liquid-crystalline side-chain polymers (figure left) with different perfluoroalkyl lengths. Sufficient length of the fluorinated side-chains causes complete suppression of the SRGs, owing to self-assembled liquid-crystalline order at the surface. This indicates the surface-dependent nature of SRG formation.

    8. Stable and Efficient White Electroluminescent Devices Based on a Single Emitting Layer of Polymer Blends (pages 1582–1589)

      P.-I Shih, Y.-H. Tseng, F.-I. Wu, A. K. Dixit and C.-F. Shu

      Article first published online: 4 JUL 2006 | DOI: 10.1002/adfm.200500767

      Thumbnail image of graphical abstract

      An orange-light-emitting polymer has been synthesized by incorporating low-bandgap benzoselenadiazole (BSeD) moieties into a blue-light-emitting polyfluorene copolymer (PFTO). Bright white-light-emitting diodes based on single-layer blends of PFTO and PFTO-BSeD5 (9 wt %) have been fabricated and give a pure white-light emission that remains almost unchanged over a wide range of biases (see figure).

    9. DNA-Assisted Monolayer Immobilization of 2D Opaline Arrays (pages 1590–1598)

      S. Kim, B. Yang, S. Hou, J. Lee and F. Papadimitrakopoulos

      Article first published online: 27 JUN 2006 | DOI: 10.1002/adfm.200500782

      Thumbnail image of graphical abstract

      DNA supramolecular recognition is employed for the immobilization of 2D opaline arrays of monodisperse polystyrene colloidal microspheres (see scheme). The selective removal of non-specifically bound multilayers is accomplished below the melting point of the hybridized oligo-DNAs. DNA hybridization plays an important role in immobilizing the first monolayer of 2D opaline arrays onto the substrate.

    10. Monomolecular-Layer Ba5Ta4O15 Nanosheets: Synthesis and Investigation of Photocatalytic Properties (pages 1599–1607)

      T.-G. Xu, C. Zhang, X. Shao, K. Wu and Y.-F. Zhu

      Article first published online: 25 JUL 2006 | DOI: 10.1002/adfm.200500849

      Thumbnail image of graphical abstract

      Ba5Ta4O15 nanosheets with monomolecular-layer thicknesses (see figure; width: 1 μm) are synthesized by a hydrothermal method without exfoliation/delamination. The formation mechanism for these nanosheets, which show high catalytic activity, is thought to involve dissolution–crystallization. The synthesis process presented provides a simple and easy route to Ba5Ta4O15 nanosheets.

    11. Enhancement of Modulus, Strength, and Toughness in Poly(methyl methacrylate)-Based Composites by the Incorporation of Poly(methyl methacrylate)-Functionalized Nanotubes (pages 1608–1614)

      D. Blond, V. Barron, M. Ruether, K. P. Ryan, V. Nicolosi, W. J. Blau and J. N. Coleman

      Article first published online: 3 JUL 2006 | DOI: 10.1002/adfm.200500855

      Thumbnail image of graphical abstract

      Functionalized carbon nanotubes can be used to enhance poly(methyl methacrylate) stiffness, strength, and toughness. However, this reinforcement tends to decrease at volume fractions greater than 0.2% owing to nanotube aggregation. Shown in the figure are polymer-covered nanotubes bridging a crack in a polymer–nanotube composite film.

    12. Orange and Red Organic Light-Emitting Devices Employing Neutral Ru(II) Emitters: Rational Design and Prospects for Color Tuning (pages 1615–1626)

      Y.-L. Tung, L.-S. Chen, Y. Chi, P.-T. Chou, Y.-M. Cheng, E. Y. Li, G.-H. Lee, C.-F. Shu, F.-I. Wu and A. J. Carty

      Article first published online: 25 JUL 2006 | DOI: 10.1002/adfm.200500901

      Thumbnail image of graphical abstract

      The rational design of a new series of charge-neutral Ru(II) metal complexes is reported here. Ruthenium complexes with isoquinolyl ligands have been utilized as dopant emitters for the fabrication of red and red-orange OLEDs (see figure). The high efficiencies and low turn-on voltage obtained using inexpensive Ru marks a significant advance in the field of organic displays.

    13. Arresting, Fixing, and Separating Dimers Composed of Uniform Silica Colloidal Spheres (pages 1627–1632)

      M. Ibisate, Z. Zou and Y. Xia

      Article first published online: 4 JUL 2006 | DOI: 10.1002/adfm.200600228

      Thumbnail image of graphical abstract

      Silica dimers have been synthesized by adding tetraethylorthosilicate (TEOS) to a colloidal suspension. The TEOS hydrolyzes and condenses to arrest and fix the dimers that result from constant collisions between the spheres. Monodisperse dimers (see figure and cover) with a yield as high as 50 % are routinely obtained. This yield could be increased to 80 % by centrifugation in a density gradient medium.

    14. Bridged Nanocrystals in Biominerals and Their Biomimetics: Classical Yet Modern Crystal Growth on the Nanoscale (pages 1633–1639)

      Y. Oaki, A. Kotachi, T. Miura and H. Imai

      Article first published online: 3 JUL 2006 | DOI: 10.1002/adfm.200600262

      Thumbnail image of graphical abstract

      Calcium carbonate biominerals and their biomimetics are made by the oriented architecture of bridged nanocrystals associated with polymers. The nanoscopic mineral bridges direct the crystal growth, leading to a variety of macroscopic morphologies (see figure). Crystal growth can thus be used in materials processing for a wide range of applications.

  4. Index

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Full Papers
    5. Index

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