Advanced Materials

Cover image for Vol. 21 Issue 8

February 23, 2009

Volume 21, Issue 8

Pages 839–928

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review Article
    6. Communications
    7. Research News
    8. Index
    1. Zinc Oxide Microstructures: Zinc Oxide Microtowers by Vapor Phase Homoepitaxial Regrowth (Adv. Mater. 8/2009)

      Zhengwei Pan, John D. Budai, Zu Rong Dai, Wenjun Liu, M. Parans Paranthaman and Sheng Dai

      Article first published online: 19 FEB 2009 | DOI: 10.1002/adma.200990025

      Thumbnail image of graphical abstract

      Simultaneous axial and radial epitaxies can be achieved by growing ZnO microtowers by repeating a growth cycle several times, report Zhengwei Pan and co-workers on p. 890. The as-grown ZnO microtowers display a preferential growth habit of hexagonal prism–dihexagonal pyramid. Some rare or new growth habits such as dihexagonal prism–dihexagonal pyramid, hexagonal prism–trihexagonal pyramid and dihexagonal prism–trihexagonal pyramid (as shown on the cover) have also been identified.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review Article
    6. Communications
    7. Research News
    8. Index
    1. Organic LEDs: The Simple Way to Solution-Processed Multilayer OLEDs – Layered Block-Copolymer Networks by Living Cationic Polymerization (Adv. Mater. 8/2009)

      Anne Köhnen, Nina Riegel, Jonas H.-W. M. Kremer, Hans Lademann, David C. Müller and Klaus Meerholz

      Article first published online: 19 FEB 2009 | DOI: 10.1002/adma.200990026

      Thumbnail image of graphical abstract

      A novel strategy for simple, intelligent, and cost-effective fabrication of multilayer OLEDs by solution-processing is demonstrated by Klaus Meerholz and co-workers on p. 879. The cover shows the self-smoothing of thin polymer films using this method, termed “layer-by-layer crosslinking” (LBLX). LBLX enables the crosslinking and smoothing of several polymer layers on top of each other simply by using a heat and wash procedure.

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review Article
    6. Communications
    7. Research News
    8. Index
    1. Contents: (Adv. Mater. 8/2009) (pages 839–844)

      Article first published online: 19 FEB 2009 | DOI: 10.1002/adma.200990027

  4. Review Article

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review Article
    6. Communications
    7. Research News
    8. Index
    1. Polymeric Materials for Gene Delivery and DNA Vaccination (pages 847–867)

      David N. Nguyen, Jordan J. Green, Juliana M. Chan, Robert Langer and Daniel G. Anderson

      Article first published online: 4 DEC 2008 | DOI: 10.1002/adma.200801478

      Thumbnail image of graphical abstract

      This Review highlights recent advances in the design of novel polymeric gene delivery systems for achieving nonviral DNA vaccination. Both microparticle and nanoparticle polymeric systems can be tailored for interaction with antigen presenting cells to improve transfection efficiency, stimulate the innate immune system, and achieve strong humoral and cellular responses to plasmid-encoded antigens.

  5. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review Article
    6. Communications
    7. Research News
    8. Index
    1. Facile Synthesis of Fe2O3 Nanocrystals without Fe(CO)5 Precursor and One-Pot Synthesis of Highly Fluorescent Fe2O3–CdSe Nanocomposites (pages 869–873)

      Chung Yen Ang, Louise Giam, Zheng Ming Chan, Alex W. H. Lin, Hongwei Gu, Eamonn Devlin, Georgia C. Papaefthymiou, Subramanian Tamil Selvan and Jackie Y. Ying

      Article first published online: 15 DEC 2008 | DOI: 10.1002/adma.200801273

      Thumbnail image of graphical abstract

      γ-Fe2O3 nanocrystals are synthesized in high yield (2 g) without a hazardous precursor and with a less-expensive oxidant in a one-pot synthesis (see figure). Bifunctional magnetic quantum-dot (γ-Fe2O3–CdSe) nanocomposites are also synthesized in high yield, with a photoluminescence quantum yield of up to 42%.

    2. Length-Dependent Mechanics of Carbon-Nanotube Networks (pages 874–878)

      Sameer S. Rahatekar, Krzysztof K. Koziol, Steven R. Kline, Erik K. Hobbie, Jeffrey W. Gilman and Alan H. Windle

      Article first published online: 12 DEC 2008 | DOI: 10.1002/adma.200802670

      Thumbnail image of graphical abstract

      The microstructure and deformation mechanics of carbon-nantotube networks are measured, and demonstrate a crossover from strain-induced deformation, dominated by aggregates of short rigid nanorods, to deformation dominated by individual long semi-flexible nanotubes. Our results suggest that short nanotubes provide the same network attributes as long ones at modestly higher concentrations, but with a significantly lower network yield stress, which implies better processability.

    3. The Simple Way to Solution-Processed Multilayer OLEDs – Layered Block-Copolymer Networks by Living Cationic Polymerization (pages 879–884)

      Anne Köhnen, Nina Riegel, Jonas H.-W. M. Kremer, Hans Lademann, David C. Müller and Klaus Meerholz

      Article first published online: 23 DEC 2008 | DOI: 10.1002/adma.200801556

      Thumbnail image of graphical abstract

      Solution-processed multilayered OLEDs are fabricated through a conceptually novel, simple, intelligent, and cost-effective strategy, namely “layer-by-layer cross-linking” (LBLX). It enables the use of a wide range of conventional and low-priced wet deposition techniques (e.g., all printing techniques), and is based on “PEDOT-initiated cross-linking” of oxetane-functionalized polymers, which resembles the “grafting-from” approach.

    4. Direct Determination of Dopant Site Selectivity in Ordered Perovskite CaCu3Ti4O12 Polycrystals by Aberration-Corrected STEM (pages 885–889)

      Si-Young Choi, Sung-Yoon Chung, Takahisa Yamamoto and Yuichi Ikuhara

      Article first published online: 30 DEC 2008 | DOI: 10.1002/adma.200802728

      Thumbnail image of graphical abstract

      Through a combination of aberration-corrected HAADF-STEM and the EELS at the atomic level, it is found that added La in CaCu3Ti4O12 is selectively substituted for Ca, rather than Cu. The present study suggests that imaging based on STEM combined with EELS can be utilized as a powerful tool that reveals the atomic-level distribution of cation dopants in complex oxides.

    5. Zinc Oxide Microtowers by Vapor Phase Homoepitaxial Regrowth (pages 890–896)

      Zhengwei Pan, John D. Budai, Zu Rong Dai, Wenjun Liu, M. Parans Paranthaman and Sheng Dai

      Article first published online: 14 JAN 2009 | DOI: 10.1002/adma.200802138

      Thumbnail image of graphical abstract

      Simultaneous axial and radial epitaxies can be achieved on growing ZnO microtowers through a regrowth technique of repeating the same growth circle for several times. The as-grown ZnO microtowers display a preferential growth habit of hexagonal prism–dihexagonal pyramid. The apexes of the pyramidal towers are very sharp, with a radius of curvature as small as 2 to 50 nm.

    6. Template-Free Tuning of Nanopores in Carbonaceous Polymers through Ionothermal Synthesis (pages 897–901)

      Pierre Kuhn, Aurélien Forget, Jürgen Hartmann, Arne Thomas and Markus Antonietti

      Article first published online: 12 DEC 2008 | DOI: 10.1002/adma.200802304

      Thumbnail image of graphical abstract

      Template-free tuning of nanopores in highly porous carbonaceous polymers can be achieved through polymerization of dicyanobiphenyl at high temperatures in a ZnCl2 melt.

    7. Production of Ultrahigh-Molecular-Weight Polyethylene/Pristine MWCNT Composites by Half-Titanocene Catalysts (pages 902–905)

      Sungjin Park and Insung S. Choi

      Article first published online: 23 DEC 2008 | DOI: 10.1002/adma.200801674

      Thumbnail image of graphical abstract

      MWCNT/ Ultrahigh-molecular-weight polyethylene (UHMWPE) composites, where pristine MWCNTs are well dispersed in the UHMWPE matrices, are produced using MWCNT/half-titanocene hybrids as catalysts. The diameter of the UHMWPE-coated MWCNT strands produced is about 30–70 nm, while the diameter of the pristine MWCNTs used is 10–15 nm. UHMWPE composites with a molecular weight greater than 2 × 106 are produced.

    8. Dispersible Ferromagnetic FePt Nanoparticles (pages 906–909)

      Jaemin Kim, Chuanbing Rong, J. Ping Liu and Shouheng Sun

      Article first published online: 18 DEC 2008 | DOI: 10.1002/adma.200801620

      Thumbnail image of graphical abstract

      A simple method to produce ferromagnetic FePt nanoparticle dispersions by thermal annealing of core/shell-structured FePt/MgO nanoparticles and removal of MgO in the presence of hexadecanethiol and oleic acid is reported. The ferromagnetic FePt nanoparticles have a room temperature coercivity of 1 T and magnetization of 56.4 emu per gram of FePt, and are suitable for single-particle magnetism studies and other magnetic applications.

    9. Utilizing Highly Crystalline Pyroelectric Material as Functional Gate Dielectric in Organic Thin-Film Transistors (pages 910–915)

      Nguyen Thanh Tien, Young Gug Seol, Le Huynh Anh Dao, Hwa Young Noh and Nae-Eung Lee

      Article first published online: 18 DEC 2008 | DOI: 10.1002/adma.200801831

      Thumbnail image of graphical abstract

      Highly crystalline P(VDF-TrFE) materials have a large remnant polarization that causes the ID–VD curves to have no current saturation in the region where they normally would. This high crystallinity also results in a positive pyroelectricity, which is different from the conventional low response and nonlinear negative pyroelectricity.

    10. Saturation, Relaxation, and Dissociation of Excited Triplet Excitons in Conjugated Polymers (pages 916–919)

      Xudong Yang, Chang-Lyoul Lee, Sebastian Westenhoff, Xinping Zhang and Neil C. Greenham

      Article first published online: 18 DEC 2008 | DOI: 10.1002/adma.200802597

      Thumbnail image of graphical abstract

      Femtosecond pump-probe spectroscopy is used to measure the excited state absorption dynamics in triplet excitons generated by continuous wave excitation of a conjugated polymer. Saturation of the T1Tn transition is observed, allowing a cross-section of 2.0 × 10−16 cm2 to be established. Relaxation to T1 occurs with a 300 fs timescale, but 20% of Tn states dissociate into charges.

  6. Research News

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review Article
    6. Communications
    7. Research News
    8. Index
    1. The Digital Revolution: A New Paradigm for Microfluidics (pages 920–925)

      Mohamed Abdelgawad and Aaron R. Wheeler

      Article first published online: 23 DEC 2008 | DOI: 10.1002/adma.200802244

      Thumbnail image of graphical abstract

      We review the state-of-the-art in digital microfluidics, a technique in which discrete droplets are manipulated by applying electrical fields to an array of electrodes. A discussion of device formats, actuation physics, and biological and nonbiological applications is presented. Along the way, we identify the key players in the field, and speculate on the advances and challenges that lie ahead.

  7. Index

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review Article
    6. Communications
    7. Research News
    8. Index

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