Advanced Functional Materials

Cover image for Advanced Functional Materials

December, 2003

Volume 13, Issue 12

Pages 903–987

    1. Template-Assisted Self-Assembly of Spherical Colloids into Complex and Controllable Structures (pages 907–918)

      Y. Xia, Y. Yin, Y. Lu and J. McLellan

      Version of Record online: 4 NOV 2003 | DOI: 10.1002/adfm.200300002

      Dewetting of colloidal suspensions across countered surfaces has been combined with capillary forces to assemble spherical colloids into complex and well-controlled structures that include circular rings, polygonal and polyhedral clusters, and linear, zigzag, and spiral chains. It is also possible to generate hetero-aggregates in the configuration of HF and H2O molecules that contain spherical colloids of different sizes, compositions, densities, functions, or a combination of these features.

    2. Anisotropic Change of Liquid-Crystal Domains by Polarized Infrared Pulse Laser Irradiation for a Columnar Mesophase (pages 919–924)

      H. Monobe, K. Kiyohara, N. Terasawa, M. Heya, K. Awazu and Y. Shimizu

      Version of Record online: 17 NOV 2003 | DOI: 10.1002/adfm.200304471

      A novel technique to control the columnar alignment of highly viscous liquid crystals has been investigated. A uniform anisotropic alignment change was observed upon IR laser irradiation for a hexagonal columnar mesophase and the relationship between the aligned columnar axis and the incident polarization was investigated. The Figure shows a laser-drawn “H” in a Colh mesophase film viewed with a polarization microscope.

    3. Oriented Growth of Self-Assembled Polyaniline Nanowire Arrays Using a Novel Method (pages 925–928)

      H. Qiu, J. Zhai, S. Li, L. Jiang and M. Wan

      Version of Record online: 17 NOV 2003 | DOI: 10.1002/adfm.200304366

      The combination of self-assembly and template-directed synthesis techniques has led to a novel method for the fabrication of highly oriented polyaniline (PANI) nanowires (see Figure), it is reported. Particular benefits are that the template does not have to be removed and the lengths of the wires can be roughly controlled by means of the polymerization time—the advantages of both the self-assembly and template worlds.

    4. Copper-Assisted Weak Polyelectrolyte Multilayer Formation on Microspheres and Subsequent Film Crosslinking (pages 929–937)

      P. Schuetz and F. Caruso

      Version of Record online: 17 NOV 2003 | DOI: 10.1002/adfm.200304483

      Multilayer films of weak polyelectrolytes are formed on microspheres by the layer-by-layer deposition of a polyamine and poly(acrylic acid). These layers are subsequently crosslinked and the coated core particles removed by solvent dissolution to yield crosslinked capsular colloids (see Figure). This work provides a platform for the generation of the next range of complex, multifunctional solid and hollow particles.

    5. Fabrication of Conducting Polymer and Complementary Gold Microstructures Using Polymer Brushes as Templates (pages 938–942)

      F. Zhou, W. Liu, J. Hao, T. Xu, M. Chen and Q. Xue

      Version of Record online: 17 NOV 2003 | DOI: 10.1002/adfm.200304469

      Conducting polymer and complementary gold patterns are generated by selective electrodeposition and etching on chemically tethered polymer brush templates (see Figure). These are prepared by monolayer surface-initiated atomic transfer radical polymerization and subsequent photopatterning. A polymer brush can efficiently block electrodeposition while its etching resistant capability is closely related to its lypohydrophilic characteristics.

    6. Preparation of Hollow Zeolite Spheres and Three-Dimensionally Ordered Macroporous Zeolite Monoliths with Functionalized Interiors (pages 943–948)

      A. Dong, N. Ren, W. Yang, Y. Wang, Y. Zhang, D. Wang, J. Hu, Z. Gao and Y. Tang

      Version of Record online: 17 NOV 2003 | DOI: 10.1002/adfm.200304405

      A wide range of guest materials with dimensions ranging from nanometers to micrometers were encapsulated into both discrete hollow zeolite spheres (see Figure) and three-dimensionally ordered macroporous zeolite monoliths. The guest materials were first incorporated into the mesopores of the silica spheres, and then encapsulated spontaneously while the hollow zeolite spheres formed during the following hydrothermal process.

    7. Polyaniline–Silica Composite Conductive Capsules and Hollow Spheres (pages 949–954)

      Z. Niu, Z. Yang, Z. Hu, Y. Lu and C.C. Han

      Version of Record online: 17 NOV 2003 | DOI: 10.1002/adfm.200304460

      Capsules and hollow spheres (see Figure) of conducting polyaniline (PANi)–inorganic silica composite with tunable core and interior cavity size are prepared using core–gel-shell particle templates. Incorporation of silica into PANi capsules and hollow spheres makes them more robust while the same conductivity level is maintained. Introduction of PANi into silica capsules and hollow spheres makes them conducting.

    8. Hydrothermal Synthesis of Rare Earth (Tb, Y) Hydroxide and Oxide Nanotubes (pages 955–960)

      Y.-P. Fang, A.-W. Xu, L.-P. You, R.-Q. Song, J.C. Yu, H.-X. Zhang, Q. Li and H.-Q. Liu

      Version of Record online: 17 NOV 2003 | DOI: 10.1002/adfm.200304470

      Synthesis of single-crystalline rare earth (Tb, Y) hydroxide nanotubes is demonstrated. Nanotubular structures grow through a dissolution–recrystallization process by hydrothermal treatment of the corresponding bulk crystals in the presence of alkali. Hydroxide nanotubes were calcined in air to produce the corresponding oxide nanotubes (as shown in the scanning electron microscopy (SEM) image, right).

    9. Synthesis of Carbon Nanotubes Using Microwave Radiation (pages 961–966)

      E.H. Hong, K.-H. Lee, S.H. Oh and C.-G. Park

      Version of Record online: 17 NOV 2003 | DOI: 10.1002/adfm.200304396

      A method for the synthesis of carbon nanotubes (CNTs) using microwave radiation is presented. CNTs were successfully synthesized by microwave heating of the catalyst loaded on various supports and organic polymer substrates such as carbon black, silica powder, and organic polymer substrates (Teflon and polycarbonate). The Figure shows CNTs grown on a Teflon substrate with a CoSx catalyst.

    10. 2,7-Bis(diarylamino)-9,9-dimethylfluorenes as Hole-Transport Materials for Organic Light-Emitting Diodes (pages 967–973)

      R.D. Hreha, C.P. George, A. Haldi, B. Domercq, M. Malagoli, S. Barlow, J.-L. Brédas, B. Kippelen and S.R. Marder

      Version of Record online: 17 NOV 2003 | DOI: 10.1002/adfm.200304464

      Three 2,7-bis(diarylamino)-9,9-dimethylfluorenes have been synthesized (see Figure). Compared to their biphenyl-bridged analogues, glass-transition temperatures are higher and ionization potentials are lower. Hole mobilities are in a similar range for fluorene and biphenyl species, but lower zero-field mobilities are found for the former. Fluorene and biphenyl species with similar ionization potential show similar behavior in light-emitting diodes.