Advanced Materials

Cover image for Vol. 22 Issue 28

July 27, 2010

Volume 22, Issue 28

Pages 2979–3092

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Review
    7. Communications
    8. Research News
    1. Organic Nonvolatile Memory: Nanostructured Anode Material for High-Power Battery System in Electric Vehicles (Adv. Mater. 28/2010)

      Khalil Amine, Ilias Belharouak, Zonghai Chen, Taison Tran, Hiroyuki Yumoto, Naoki Ota, Seung-Taek Myung and Yang-Kook Sun

      Article first published online: 21 JUL 2010 | DOI: 10.1002/adma.201090091

      Thumbnail image of graphical abstract

      Takhee Lee and co-workers demonstrate on p. 3071 that organic nonvolatile memory devices can be fabricated on flexible substrates. The organic nonvolatile memory devices show rewritable and nearly consistent switching characteristics, regardless of the bending circumstances. The stable switching performance of the organic memory devices with bending stress is a promising property, ultimately enhancing the possibility of the application for flexible organic memory devices.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Review
    7. Communications
    8. Research News
    1. Cell-Compatible Hydrogels: A Microfluidic Hydrogel Capable of Cell Preservation without Perfusion Culture under Cell-Based Assay Conditions (Adv. Mater. 28/2010)

      Yan Xu, Kae Sato, Kazuma Mawatari, Tomohiro Konno, Kihoon Jang, Kazuhiko Ishihara and Takehiko Kitamori

      Article first published online: 21 JUL 2010 | DOI: 10.1002/adma.201090092

      Thumbnail image of graphical abstract

      Yan Xu and co-workers report on p. 3017 on a phospholipid polymer hydrogel that exhibits a remarkable ability to preserve cells on microfluidic chips without perfusion culture under cell-based assay conditions, with characteristics including maintenance of high cell viability, restraint of cell proliferation, and minimization of cellular function loss over a period of days and weeks. This material could establish a revolutionary flexibility for cellbased applications.

  3. Contents

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

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Review
    7. Communications
    8. Research News
    1. Fluorescent Nanoparticles Based on Self-Assembled π-Conjugated Systems (pages 2985–2997)

      Adrien Kaeser and Albertus P. H. J. Schenning

      Article first published online: 9 JUN 2010 | DOI: 10.1002/adma.201000427

      Thumbnail image of graphical abstract

      The increasing field of fluorescent materials for bioimaging and sensingapplications has generated a lot of interest for nanoparticles based on π-conjugated systems. This progress report highlights the important advancements achieved in the self-assembly of polymeric and discrete molecules, and the development of these nanoparticles toward advanced nanobiotechnological applications.

  5. Review

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Review
    7. Communications
    8. Research News
    1. Engineering Nanoassemblies of Polysaccharides (pages 2998–3016)

      Soheil Boddohi and Matt J. Kipper

      Article first published online: 30 JUN 2010 | DOI: 10.1002/adma.200903790

      Thumbnail image of graphical abstract

      Polysaccharides have many biochemical and biomechanical functions that depend upon their nanoscale structure in their native biological contexts. Here we review recent developments in techniques to tune the assembly of polysaccharides at the nanometer length scale. This body of work is leading to new understanding of the emergent biological properties of polysaccharide nanoassemblies.

  6. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Review
    7. Communications
    8. Research News
    1. A Microfluidic Hydrogel Capable of Cell Preservation without Perfusion Culture under Cell-Based Assay Conditions (pages 3017–3021)

      Yan Xu, Kae Sato, Kazuma Mawatari, Tomohiro Konno, Kihoon Jang, Kazuhiko Ishihara and Takehiko Kitamori

      Article first published online: 25 MAY 2010 | DOI: 10.1002/adma.201000006

      Thumbnail image of graphical abstract

      A 2-methacryloyloxyethyl phosphorylcholine (MPC) polymer hydrogel exhibits a remarkable ability to preserve cells on microfluidic chips without perfusion culture under cell-based assay conditions, with characteristics of maintenance of high cell viability, restraint of cell proliferation, and minimization of cellular function loss over a period of days and weeks. This would establish a revolutionary flexibility for cell-based applications.

    2. Micro-demultiplexer of Coupled Resonator Optical Waveguide Fabricated by Microspheres (pages 3022–3026)

      Tadashi Mitsui, Yutaka Wakayama, Tsunenobu Onodera, Takeru Hayashi, Naoki Ikeda, Yoshimasa Sugimoto, Tadashi Takamasu and Hidetoshi Oikawa

      Article first published online: 20 MAY 2010 | DOI: 10.1002/adma.201000155

      Thumbnail image of graphical abstract

      A micro-demultiplexer of a coupled resonator optical waveguide composed of polystyrene microspheres is fabricated by a self-assembly technique in colloidal suspension on a lithographically patterned substrate. The spectrum of propagating light taken at the 60°-branch (Point 2) shows sharper peaks than that taken at Point 1 while the spectrum taken at the 30°-branch (Point 3) shows broader peaks.

    3. Polymer-Embedded Carbon Nanotube Ribbons for Stretchable Conductors (pages 3027–3031)

      Yingying Zhang, Chris J. Sheehan, Junyi Zhai, Guifu Zou, Hongmei Luo, Jie Xiong, Y. T. Zhu and Q. X. Jia

      Article first published online: 1 JUN 2010 | DOI: 10.1002/adma.200904426

      Thumbnail image of graphical abstract

      A transparent stretchable conductor, in which well-aligned CNT ribbons are embedded in poly(dimethylsiloxane) (PDMS) (CNT/PDMS film), is presented. Due to the good inter-tube contact and stable CNT arrangement in the CNT ribbons, the CNT/PDMS film can maintain stable conductivity under repetitive stretching to strains up to 100%.

    4. Fluorene Based Conjugated Polyelectrolyte/Silica Nanocomposites: Charge-Mediated Phase Aggregation at the Organic–Inorganic Interface (pages 3032–3037)

      Rachel C. Evans, Andreia G. Macedo, Swapna Pradhan, Ullrich Scherf, Luís D. Carlos and Hugh D. Burrows

      Article first published online: 9 JUN 2010 | DOI: 10.1002/adma.200904377

      Thumbnail image of graphical abstract

      Polyfluorene based conjugated polyelectrolyte/silica nanocomposites are fabricated using sol-gel processing. Ionic termination groups on the conjugated polyelectrolyte lateral chains are shown to control the interaction at the inorganic-organic interface, leading to macroscale homogeneity and nanophase separation in a single material. The extent of nanophase separation is determined by the nature of the ionic groups, which may provide a means of controlling donor-acceptor distances in hybrid systems.

    5. A Versatile “Click” Chemistry Precursor of Functional Polystyrene Nanoparticles (pages 3038–3041)

      Lorea Oria, Roberto Aguado, José A. Pomposo and Juan Colmenero

      Article first published online: 2 JUN 2010 | DOI: 10.1002/adma.201000243

      Thumbnail image of graphical abstract

      The synthesis of a versatile “click” chemistry precursor of functional polystyrene nanoparticles is reported. The resulting nanoparticles thereof offer inherent characteristics of ultrasmall polymeric nanoparticles (size ≈4 nm) plus interesting functionalization possibilities, opening the door to new hybrid, soft nano-objects, bridging the gap between synthetic and natural polymers.

    6. Development of Extracellular Matrices Mimicking Stepwise Adipogenesis of Mesenchymal Stem Cells (pages 3042–3047)

      Takashi Hoshiba, Naoki Kawazoe, Tetsuya Tateishi and Guoping Chen

      Article first published online: 1 JUN 2010 | DOI: 10.1002/adma.201000038

      Thumbnail image of graphical abstract

      A novel type of extracellular matrices, stepwise adipogenesis-mimicking matrices, was developed from cultured mesenchymal stem cells controlled at different stages of adipogenesis. The matrices derived from stem cells, and the cells controlled at early and late stages of adipogenesis showed different effects on stem cell differentiation.

    7. Nanoscale Imaging of the Interface Dynamics in Polymer Blends by Femtosecond Pump-Probe Confocal Microscopy (pages 3048–3051)

      Dario Polli, Giulia Grancini, Jenny Clark, Michele Celebrano, Tersilla Virgili, Giulio Cerullo and Guglielmo Lanzani

      Article first published online: 24 JUN 2010 | DOI: 10.1002/adma.200904387

      Thumbnail image of graphical abstract

      A polymer blend of a polyfluorene and an inert matrix is imaged with an innovative time-resolved confocal microscope. Local pump-probe signals (excited-state generation and deactivation) with sub-200-fs temporal resolution and 300-nm spatial resolution are measured. Peculiar dynamics at the interface between the segregated domains, invisible to standard optical microscopy, due to different inter-chain interactions and charge separation photophysics are detected.

    8. Nanostructured Anode Material for High-Power Battery System in Electric Vehicles (pages 3052–3057)

      Khalil Amine, Ilias Belharouak, Zonghai Chen, Taison Tran, Hiroyuki Yumoto, Naoki Ota, Seung-Taek Myung and Yang-Kook Sun

      Article first published online: 1 JUN 2010 | DOI: 10.1002/adma.201000441

      Thumbnail image of graphical abstract

      A new MSNP-LTO anode is developed to enable a high-power battery system that provides three times more power than any existing battery system. It shows excellent cycle life and low-temperature performance, and exhibits unmatched safety characteristics.

    9. All-Carbon Electronic Devices Fabricated by Directly Grown Single-Walled Carbon Nanotubes on Reduced Graphene Oxide Electrodes (pages 3058–3061)

      Bing Li, Xiehong Cao, Hock Guan Ong, Jun Wei Cheah, Xiaozhu Zhou, Zongyou Yin, Hai Li, Junling Wang, Freddy Boey, Wei Huang and Hua Zhang

      Article first published online: 1 JUN 2010 | DOI: 10.1002/adma.201000736

      Thumbnail image of graphical abstract

      A simple method for fabrication of all carbon CNT-rGO devices was developed, where the individual long-aligned SWCNT directly grew by CVD to connect with rGO electrodes scratched by non-metal objects.

    10. Light Emission Characteristics and Mechanics of Foldable Inorganic Light-Emitting Diodes (pages 3062–3066)

      Sang-Il Park, An-Phong Le, Jian Wu, Yonggang Huang, Xiuling Li and John A. Rogers

      Article first published online: 14 MAY 2010 | DOI: 10.1002/adma.201000591

      Thumbnail image of graphical abstract

      Strategies are presented for forming inorganic, microscale light emitting diodes in interconnected arrays on plastic substrates, configured to accommodate extreme levels of bending, with negligible changes in the electrical properties or the emission wavelengths in the devices. The studies include quantitative analysis of the underlying mechanics and experimental measurements of bending induced shifts in the emission wavelength.

    11. Facile and Scalable Fabrication of Well-Aligned and Closely Packed Single-Walled Carbon Nanotube Films on Various Substrates (pages 3067–3070)

      Bin Wang, Yanfeng Ma, Na Li, Yingpeng Wu, Feifei Li and Yongsheng Chen

      Article first published online: 28 APR 2010 | DOI: 10.1002/adma.201000705

      Thumbnail image of graphical abstract

      Horizontal alignment of single-walled carbon nanotubes (SWNTs) in large-area (square centimeter scale) films is achieved by a facile approach. Combining in situ arc discharge growth of SWNTs with a weak (0.56 T) magnetic field allows aligned SWNT films to be fabricated on various substrates, including flexible plastics. Moreover, the film size, thickness, location and orientation can all be controlled.

    12. Stable Switching Characteristics of Organic Nonvolatile Memory on a Bent Flexible Substrate (pages 3071–3075)

      Yongsung Ji, Byungjin Cho, Sunghoon Song, Tae-Wook Kim, Minhyeok Choe, Yung Ho Kahng and Takhee Lee

      Article first published online: 1 JUN 2010 | DOI: 10.1002/adma.200904441

      Thumbnail image of graphical abstract

      Organic nonvolatile memory devices fabricated on flexible substrates showed rewritable and nearly consistent switching characteristics, regardless of the bending circumstances. This stable memory performance with bending stress is a promising property for the practical memory devices in future flexible electronics.

    13. White-Light-Emitting Diodes with Quantum Dot Color Converters for Display Backlights (pages 3076–3080)

      Eunjoo Jang, Shinae Jun, Hyosook Jang, Jungeun Lim, Byungki Kim and Younghwan Kim

      Article first published online: 31 MAY 2010 | DOI: 10.1002/adma.201000525

      Thumbnail image of graphical abstract

      Highly luminescent, multiply passivated green- and red-light-emitting quantum dots are used as color converters in InGaN blue LEDs to achieve external quantum efficiencies of 72% and 34%, respectively. White QD-LEDs prepared for a display backlight are shown to have an efficacy of 41 lm W−1 and color reproducibility of 100% compared to the NTSC standard in CIE 1931. Finally, a 46 inch LCD TV panel (see image) using the QD-LED backlight is successfully demonstrated for the first time.

    14. Designed Organophosphonate Self-Assembled Monolayers Enhance Device Performance of Pentacene-Based Organic Thin-Film Transistors (pages 3081–3085)

      Kung-Ching Liao, Ahmad G. Ismail, Laurent Kreplak, Jeffrey Schwartz and Ian G. Hill

      Article first published online: 8 JUN 2010 | DOI: 10.1002/adma.201001310

      Thumbnail image of graphical abstract

      Excellent device characteristics are measured for a pentacene-based thin film transistor where the SiO2 gate dielectric is terminated with a self-assembled monolayer of 9,10-dinaphthylanthracene-2-phosphonate in which calculated molecular spacings are about 0.7 nm. This creates channels that are on the order of the “thickness” of an aromatic π system, which could allow for intercalation of pentacene units, favoring a π-stacking motif for this first pentacene layer.

  7. Research News

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Review
    7. Communications
    8. Research News
    1. Reversed Crystal Growth: Implications for Crystal Engineering (pages 3086–3092)

      Wuzong Zhou

      Article first published online: 20 APR 2010 | DOI: 10.1002/adma.200904320

      Thumbnail image of graphical abstract

      The discovery of a reversed crystal growth route in zeolite analcime implies that crystal growth does not always follow classic theory. Aggregation of nanoparticles may dominate in early-stage crystal growth, followed by surface crystallization, and then extension from surface to core. Recent developments and evidence of such a novel phenomenon in other materials are discussed.

SEARCH

SEARCH BY CITATION