Advanced Materials

Cover image for Vol. 21 Issue 17

May 4, 2009

Volume 21, Issue 17

Pages 1655–1772

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Communications
    7. Research News
    8. Index
    1. Ordered Gold Nanoarrays: 3D Ordered Gold Strings by Coating Nanoparticles with Mesogens (Adv. Mater. 17/2009)

      Xiangbing Zeng, Feng Liu, Alan G. Fowler, Goran Ungar, Liliana Cseh, Georg H. Mehl and J. Emyr Macdonald

      Article first published online: 22 APR 2009 | DOI: 10.1002/adma.200990057

      Thumbnail image of graphical abstract

      Liquid-crystal-coated gold nanoparticles exhibit 3D long-range ordering in strings jacketed by rod-like mesogens (shown in green) with controllable interparticle spacing. The work reported on p. 1746 by Goran Ungar and co-workers demonstrates a new method of assembling ordered metal nanoparticle superlattices, in a step towards developing self-assembled metamaterials. The cover shows red, yellow, and blue nanoparticles lying at different heights and forming a rhombohedral lattice.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Communications
    7. Research News
    8. Index
    1. Artifical Muscles: Nanocomposite Hydrogel with High Toughness for Bioactuators (Adv. Mater. 17/2009)

      Min Kyoon Shin, Geoffrey M. Spinks, Su Ryon Shin, Sun I. Kim and Seon Jeong Kim

      Article first published online: 22 APR 2009 | DOI: 10.1002/adma.200990058

      Thumbnail image of graphical abstract

      The inside cover shows a nanofibrous hydrogel based on ferritin for a bioinspired nanocomposite actuator, reported in work by Seon Jeong Kim and co-workers on p. 1712. The ferritin-based nanofibrous hydrogels demonstrate synergy between the ferritin protein and a synthetic polymer matrix, as the protein shell of ferritin behaves like an elastic nanospring in the polymer. The actuator is reversibly actuated by chemical energy under external tensile stress, showing improved response speed in comparison to bulk and microfiber hydrogels, coming closer to the goal of mimicking the performance of natural muscle.

  3. Contents

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

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Communications
    7. Research News
    8. Index
    1. Structure–Property Relation of SrTiO3/LaAlO3 Interfaces (pages 1665–1677)

      Mark Huijben, Alexander Brinkman, Gertjan Koster, Guus Rijnders, Hans Hilgenkamp and Dave H. A. Blank

      Article first published online: 2 MAR 2009 | DOI: 10.1002/adma.200801448

      Thumbnail image of graphical abstract

      The interface between the insulating oxides SrTiO3 and LaAlO3 shows a variety of transport properties. The properties of the interface can be explained by three structural aspects: oxygen vacancies, structural deformations (including cation disorder), and electronic interface reconstruction. Irrespective of the origin of mobile charge at these heterointerfaces, once harnessed and controlled all could lead to heterostructures, where the properties are determined by strong correlation effects, and therefore full of surprises.

  5. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Communications
    7. Research News
    8. Index
    1. Dispersion of Graphene Sheets in Organic Solvent Supported by Ionic Interactions (pages 1679–1683)

      Yanyu Liang, Dongqing Wu, Xinliang Feng and Klaus Müllen

      Article first published online: 6 FEB 2009 | DOI: 10.1002/adma.200803160

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      Organic solution-processable graphene sheets were prepared using a large-scale novel approach based on a transfer process assisted by ionic interactions. Smooth monolayer graphene sheets were easily fabricated on a substrate from organic solution. Such a noncovalent functionalization preserves the extended aromatic conjugation of reduced graphene sheets, giving rise to high-conductivity cast films.

    2. Antimicrobial Activity of Silver Nanocrystals Encapsulated in Mesoporous Silica Nanoparticles (pages 1684–1689)

      Monty Liong, Bryan France, Kenneth A. Bradley and Jeffrey I. Zink

      Article first published online: 9 FEB 2009 | DOI: 10.1002/adma.200802646

      Thumbnail image of graphical abstract

      Silver nanocrystals encapsulated in mesoporous silica nanoparticles are prepared by coating hydrophobic silver nanocrystals with amphiphilic surfactants and growing mesostructured silica around the materials. The nanoparticles can be used as antimicrobial agents for both Gram-positive and -negative bacteria through oxidative dissolution of the silver nanocrystals. The surface characteristics of the silica exterior affect the binding to the bacteria and the cytotoxicity.

    3. Highly Efficient Green-Light-Emitting Diodes Based on CdSe@ZnS Quantum Dots with a Chemical-Composition Gradient (pages 1690–1694)

      Wan Ki Bae, Jeonghun Kwak, Ji Won Park, Kookheon Char, Changhee Lee and Seonghoon Lee

      Article first published online: 2 FEB 2009 | DOI: 10.1002/adma.200801908

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      Highly efficient green-light-emitting diodes (LEDs) based on CdSe@ZnS quantum dots (QDs) with a chemical-composition gradient are demonstrated. Through the moderate control of QD coverage in multilayered devices, excellent device performance has been achieved. The color-saturated green-light emission (see figure for Commission Internationale de l'Eclairage (CIE) co-ordinates) is mainly from the QD layers (more than 99% of total emission).

    4. Ga2Te3Sb5—A Candidate for Fast and Ultralong Retention Phase-Change Memory (pages 1695–1699)

      Kin-Fu Kao, Chain-Ming Lee, Ming-Jung Chen, Ming-Jinn Tsai and Tsung-Shune Chin

      Article first published online: 9 FEB 2009 | DOI: 10.1002/adma.200800423

      Thumbnail image of graphical abstract

      Incongruent melting phenomenon shows the feasibility of multilevel control using the phase-change material Ga2Te3Sb5 (Ga-TS). Electrical results showed that Ga-TS cells require 25% less RESET current than do GST cells. Meanwhile it possesses a high programming speed, ultralong data retention extrapolated to one million years at 120 °C, and superior thermal properties for phase-change random-access-memory applications.

    5. Is There a ZnO Face Stable to Atomic Hydrogen? (pages 1700–1706)

      Giovanni Bruno, Maria Michela Giangregorio, Graziella Malandrino, Pio Capezzuto, Ignazio L. Fragalà and Maria Losurdo

      Article first published online: 20 FEB 2009 | DOI: 10.1002/adma.200802579

      Thumbnail image of graphical abstract

      The interaction of atomic hydrogen with ZnO depends on ZnO polarity. O-polar (000−1) ZnO is stable to atomic hydrogen; Zn-polar (0001) ZnO is partially attacked by atomic hydrogen, affording a self-inhibiting reaction that enriches the surface in metallic Zn; nonpolar (11−20) ZnO is completely etched by atomic hydrogen; and the nonpolar (10−10) ZnO is roughened during interaction with atomic hydrogen.

    6. Hexyl-Derivatized Poly(3,4-ethylenedioxyselenophene): Novel Highly Stable Organic Electrochromic Material with High Contrast Ratio, High Coloration Efficiency, and Low-Switching Voltage (pages 1707–1711)

      Mao Li, Asit Patra, Yana Sheynin and Michael Bendikov

      Article first published online: 6 FEB 2009 | DOI: 10.1002/adma.200802259

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      A novel family of electrochromic materials has been discovered. The electropolymerized poly(hexyl-3,4-ethylenedioxyselenophene) film switches color between a highly absorbing pure blue and a nearly colorless bleached state, achieves both a high contrast ratio of 88–89% and a high CE of up to 773 cm2 C−1 while showing a fast switching time and remarkable stability with the contrast ratio remaining 48% after 10000 cycles.

    7. Nanocomposite Hydrogel with High Toughness for Bioactuators (pages 1712–1715)

      Min Kyoon Shin, Geoffrey M. Spinks, Su Ryon Shin, Sun I. Kim and Seon Jeong Kim

      Article first published online: 19 FEB 2009 | DOI: 10.1002/adma.200802205

      Thumbnail image of graphical abstract

      Ferritin-based nanofibrous hydrogels that demonstrate synergy between the ferritin protein and the synthetic polymer matrix are fabricated. The hybrid hydrogels showed enhanced mechanical properties and repeated expansion and contraction without showing severe creep during pH switching. The ferritin nanoparticles incorporated into the hydrogel nanofibers improved the actuation stability of a hydrogel actuator by acting as elastic nanosprings in a nanoscale polymer.

    8. Organic–Inorganic Sol–Gel Composites Incorporating Semiconductor Nanocrystals for Optical Gain Applications (pages 1716–1720)

      Miri Kazes, Tsiala Saraidarov, Renata Reisfeld and Uri Banin

      Article first published online: 5 FEB 2009 | DOI: 10.1002/adma.200802883

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      Organic-inorganic sol-gel composite incorporating highly emitting CdSe/ZnS quantum dots and CdSe/CdS/ZnS quantum rods is reported. Optical gain measurements conducted on a quantum rod/sol-gel composite film show stable room temperature amplified spontaneous emission under ambient conditions.

    9. Controllable Growth of 0D to Multidimensional Nanostructures of a Novel Porphyrin Molecule (pages 1721–1725)

      Changshui Huang, Liping Wen, Huibiao Liu, Yuliang Li, Xiaofeng Liu, Mingjian Yuan, Jin Zhai, Lei Jiang and Daoben Zhu

      Article first published online: 20 FEB 2009 | DOI: 10.1002/adma.200802114

      Thumbnail image of graphical abstract

      Control of the progressive growth of porphyrin triads from 0D to multidimensional nanostructures is achieved. Electron-microscopy images vividly record the growth process and confirm that the molecules are able to self-assemble into spherical vesicles, thereafter continually growing into tadpole-like vesicles, nanotubes, and Y-like nanotubes.

    10. Gold “Nanograils” with Tunable Dipolar Multiple Plasmon Resonances (pages 1726–1731)

      Chul-Joon Heo, Se-Heon Kim, Se Gyu Jang, Su Yeon Lee and Seung-Man Yang

      Article first published online: 19 FEB 2009 | DOI: 10.1002/adma.200802776

      Thumbnail image of graphical abstract

      Gold “nanograils”, novel plasmonic nanostructures that can be represented as three different-sized rings connected vertically by curved surfaces, similar to a miniaturized grail, are presented. Reflectance measurements and FDTD simulations demonstrate the existence of strong multiple plasmon resonances with the same dipolar symmetry around the sharp ring edges of the nanograils.

    11. Self-Organized Nanocrystalline Organosilicates in Organic-Inorganic Hybrid Films (pages 1732–1736)

      Masahide Takahashi, Cristiana Figus, Tongjit Kichob, Stefano Enzo, Maria Casula, Massimiliano Valentini and Plinio Innocenzi

      Article first published online: 20 FEB 2009 | DOI: 10.1002/adma.200802937

      Thumbnail image of graphical abstract

      Organic-inorganic hybrid films containing layered organosilica nanocrystals are obtained by an alcohol-free hydrolytic sol-gel process from a mono-functionalized organically modified alkoxide. Kinetically controlled self-organization is used to design the hybrid nanocomposite films. The layered nanocrystals are shown to be oriented within the films, which exhibited optical anisotropy (Δn > 10−3); the hybrid nanocomposite material is shown to be suitable for microfabrication by soft lithography.

    12. Reversible Luminescent Switching in a [Eu(SiW10MoO39)2]13−-Agarose Composite Film by Photosensitive Intramolecular Energy Transfer (pages 1737–1741)

      Zhongliang Wang, Ying Ma, Ruili Zhang, Aidong Peng, Qing Liao, Zongwei Cao, Hongbing Fu and Jiannian Yao

      Article first published online: 19 FEB 2009 | DOI: 10.1002/adma.200803321

      Thumbnail image of graphical abstract

      Transparent, flexible, self-supporting EuSiWMo/agarose composite films are fabricated by a combination of hydrogel chemistry and a casting technique, and present reversible, high-contrast luminescence photoswitching modulated by inorganic photochromic components through intramolecular resonance-energy transfer. Two-dimensional recording employing the luminescence as read-out signals is accomplished in this novel recording medium.

    13. Antimicrobial Nanotubes Consisting of Ag-Embedded Peptidic Lipid-Bilayer Membranes as Delivery Vehicles (pages 1742–1745)

      Yong Zhou, Masaki Kogiso, Masumi Asakawa, Sijun Dong, Ryoiti Kiyama and Toshimi Shimizu

      Article first published online: 19 FEB 2009 | DOI: 10.1002/adma.200803072

      Thumbnail image of graphical abstract

      Functional drug-delivery vehicles consisting of Ag-embedded bilayer membranes of a peptidic lipid nanotube (LNT) are synthesized. The Ag–LNTs possess antimicrobial ability against E coli, contributing to the release of Ag+ into the aqueous culture. The Ag–LNTs may be applicable to the delivery of DNA or biotechnological drugs that are usually sensitive to changes in their surroundings.

    14. 3D Ordered Gold Strings by Coating Nanoparticles with Mesogens (pages 1746–1750)

      Xiangbing Zeng, Feng Liu, Alan G. Fowler, Goran Ungar, Liliana Cseh, Georg H. Mehl and J. Emyr Macdonald

      Article first published online: 2 MAR 2009 | DOI: 10.1002/adma.200803403

      Thumbnail image of graphical abstract

      Gold nanoparticles covered with a nematic liquid-crystal ligand laterally attached via a thioalkyl spacer and a thioalkane “diluent” exhibit 3D ordering in strings jacketed by the mesogens with controllable interparticle spacing. The particles form rhombohedral, hexagonal, and rectangular columnar superlattices, not the usual packing modes of spheres.

    15. Monodisperse, Polymeric Nano- and Microsieves Produced with Interference Holography (pages 1751–1755)

      An Maria Prenen, J. C. A. “Hans” van der Werf, Cornelis W. M. Bastiaansen and Dick J. Broer

      Article first published online: 9 FEB 2009 | DOI: 10.1002/adma.200803177

      Thumbnail image of graphical abstract

      Monodisperse microfiltration membranes are fabricated using interference lithography. The versatility of this technique to produce polymeric membranes optimized for flow and selectivity characteristics with a wide variety of pore geometries and dimensions is demonstrated.

    16. Field Emission of Single-Layer Graphene Films Prepared by Electrophoretic Deposition (pages 1756–1760)

      Zhong-Shuai Wu, Songfeng Pei, Wencai Ren, Daiming Tang, Libo Gao, Bilu Liu, Feng Li, Chang Liu and Hui-Ming Cheng

      Article first published online: 25 FEB 2009 | DOI: 10.1002/adma.200802560

      Thumbnail image of graphical abstract

      Homogeneous single-layer graphene films are fabricated using an electrophoretic deposition technique, and their field-emission properties are investigated. The graphene films show high density, uniform thickness, numerous edges normal to the film surface, and good interface contact and adhesion with the substrate, and consequently show excellent field-emission properties.

    17. Water-Miscible Liquid Multiwalled Carbon Nanotubes (pages 1761–1765)

      Maurizio Fagnoni, Antonella Profumo, Daniele Merli, Daniele Dondi, Piercarlo Mustarelli and Eliana Quartarone

      Article first published online: 19 FEB 2009 | DOI: 10.1002/adma.200801994

      Thumbnail image of graphical abstract

      Viscous, water-miscible, liquid multiwalled carbon nanotubes with an extraordinarily high degree of functionalization (hf-MWCNTs) have been obtained by means of a deep-sidewall modification process. The hf-MWCNTs behave as an ionic liquid, with a conductivity of 1 mS cm−1 at 100 °C. The unique properties of this material render it suitable in a wide spectrum of applications, ranging from nanomedicine to energetics.

  6. Research News

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Report
    6. Communications
    7. Research News
    8. Index
    1. Multifunctional Composites of Ceramics and Single-Walled Carbon Nanotubes (pages 1767–1770)

      Nitin P. Padture

      Article first published online: 23 FEB 2009 | DOI: 10.1002/adma.200802270

      Thumbnail image of graphical abstract

      Polycrystalline ceramic/single wall carbon nanotubes (SWNTs) composites possess unique grain boundaries containing 1D tortuous SWNTs bundles that form 2D tangled embedded nets. This unprecedented grain-boundary structure allows tailoring of multifunctional composites with unique combinations of desirable mechanical (toughness, strength, creep) and transport (electrical, thermal) properties. A brief discussion and analysis of recent developments in these composites are presented.

  7. Index

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

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