Advanced Materials

Cover image for Vol. 21 Issue 40

October 26, 2009

Volume 21, Issue 40

Pages 3965–4057

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
    1. Lanthanide Nanocrystals: Colloidal Tm3+/Yb3+-Doped LiYF4 Nanocrystals: Multiple Luminescence Spanning the UV to NIR Regions via Low-Energy Excitation (Adv. Mater. 40/2009)

      Venkataramanan Mahalingam, Fiorenzo Vetrone, Rafik Naccache, Adolfo Speghini and John A. Capobianco

      Version of Record online: 16 OCT 2009 | DOI: 10.1002/adma.200990149

      Thumbnail image of graphical abstract

      LiYF4 nanoparticles co-doped with thulium and ytterbium ions show multiple emissions in the region covering the ultraviolet to the near-infrared following excitation with low-energy radiation via a multiphoton process known as upconversion, in work reported by John Capobianco and co-workers on p. 4025. These versatile diamond-shaped nanoparticles have been identified as candidates for potential integration in various applications including cell labeling and imaging, solution-based fast scintillation, as well as anti-counterfeiting.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
    1. Photoluminescent Fibers: Anisotropic Self-Assembly of Photoluminescent Oligo(p-Phenylenevinylene) Derivatives in Liquid Crystals: An Effective Strategy for the Macroscopic Alignment of π-Gels (Adv. Mater. 40/2009)

      Yuki Hirai, S. Santhosh Babu, Vakayil K. Praveen, Takuma Yasuda, Ayyappanpillai Ajayaghosh and Takashi Kato

      Version of Record online: 16 OCT 2009 | DOI: 10.1002/adma.200990150

      Thumbnail image of graphical abstract

      Takashi Kato, Ayyappanpillai Ajayaghosh, and co-workers report on p. 4029 that aligned photoluminescent π-conjugated fibers are formed through anisotropic self-assembly of oligo(p-phenylenevinylene) gelators in smectic and nematic liquid crystals. The aligned fibers exhibit polarized photoluminescent properties. These self-assembled liquid-crystalline composites may be applicable to new types of electro-optical and photonic materials.

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
  4. Review

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
    1. Nanomaterials for Neural Interfaces (pages 3970–4004)

      Nicholas A. Kotov, Jessica O. Winter, Isaac P. Clements, Edward Jan, Brian P. Timko, Stéphane Campidelli, Smita Pathak, Andrea Mazzatenta, Charles M. Lieber, Maurizio Prato, Ravi V. Bellamkonda, Gabriel A. Silva, Nadine Wong Shi Kam, Fernando Patolsky and Laura Ballerini

      Version of Record online: 8 JUL 2009 | DOI: 10.1002/adma.200801984

      Thumbnail image of graphical abstract

      Many mechanical, electrical, optical, and other properties of nanomaterials make them ideal candidates for neural applications. In this work we review current concepts, successes, challenges, and future prospects of research at the interface of nanomaterials and neural technologies. Special attention is given to identification of the most significant problems of neural applications and specific nanomaterials that can contribute to their resolution.

  5. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
    1. Vertically Aligned Nanowires on Flexible Silicone using a Supported Alumina Template prepared by Pulsed Anodization (pages 4005–4010)

      Stefan Mátéfi-Tempfli and Mária Mátéfi-Tempfli

      Version of Record online: 2 JUN 2009 | DOI: 10.1002/adma.200900344

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      Carpets of vertically aligned nanowires on flexible substrates are successfully realized by a template method. Applying special pulsed anodization conditions, defect-free nanoporous alumina structures supported on polydimethylsiloxane (PDMS), a flexible silicone elastomer, are created. By using this template with nanopores ending on a conducting underlayer, a high-density nanowire array can be simply grown by direct DC-electrodeposition on the top of the silicone rubber.

    2. On the Stability of Amorphous Minerals in Lobster Cuticle (pages 4011–4015)

      Ali Al-Sawalmih, Chenghao Li, Stefan Siegel, Peter Fratzl and Oskar Paris

      Version of Record online: 28 MAY 2009 | DOI: 10.1002/adma.200900295

      Thumbnail image of graphical abstract

      In situ X-ray diffraction during heating of lobster cuticle reveals three regions of thermally induced transformations: 1)Chitin decomposition, 2) amorphous calcium carbonate (ACC) – calcite transformation, and 3) amorphous calcium phosphate (ACP) – hydroxyapatite transformation. These results provide new insights into the stabilization mechanisms of amorphous biominerals based on ACC and ACP.

    3. Morphology- and Color-Tunable Bright Fibers with High Concentration of CdTe Nanocrystals Assembled through Sol–Gel Reaction (pages 4016–4019)

      Ping Yang, Masanori Ando and Norio Murase

      Version of Record online: 28 MAY 2009 | DOI: 10.1002/adma.200900733

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      Intensely luminescent fibers are prepared by the self-assembly of hybrid SiO2-coated CdTe nanocrystals (NCs), SiO2 monomers, and a complex of Cd2+ and thioglycolic acid. These fibers exhibit tunable photoluminescent colors (yellow to red) and morphologies (tubal, solid, and belt-like) with an extremely high concentration of CdTe NCs by controlling the preparation parameters.

    4. Production of Quantum Dot Barcodes Using Biological Self-Assembly (pages 4020–4024)

      Sakandar Rauf, Andrew Glidle and Jon M. Cooper

      Version of Record online: 2 JUN 2009 | DOI: 10.1002/adma.200900223

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      A new strategy to produce stable barcodes using biological self-assembly of streptavidin- and biotin-functionalized quantum dots is reported. Such systems are of potential use in multiplexed immunoassay and nucleic acid hybridization assays.

    5. Colloidal Tm3+/Yb3+-Doped LiYF4 Nanocrystals: Multiple Luminescence Spanning the UV to NIR Regions via Low-Energy Excitation (pages 4025–4028)

      Venkataramanan Mahalingam, Fiorenzo Vetrone, Rafik Naccache, Adolfo Speghini and John A. Capobianco

      Version of Record online: 29 JUN 2009 | DOI: 10.1002/adma.200901174

      Thumbnail image of graphical abstract

      Highly dispersible Tm3+/Yb3+-doped LiYF4 nanocrystals were synthesized using a thermal decomposition method. Upon excitation with a NIR diode laser (980 nm), the dilute dispersion of the nanocrystals exhibits several strong emissions in regions spanning the deep-UV to NIR, all originating from a single dopant/sensitizer (Tm3+/Yb3+) combination. The material is envisioned to have potential interests in anti-counterfeiting, biomedicine and solution-based scintillation applications.

    6. Anisotropic Self-Assembly of Photoluminescent Oligo(p-Phenylenevinylene) Derivatives in Liquid Crystals: An Effective Strategy for the Macroscopic Alignment of π-Gels (pages 4029–4033)

      Yuki Hirai, S. Santhosh Babu, Vakayil K. Praveen, Takuma Yasuda, Ayyappanpillai Ajayaghosh and Takashi Kato

      Version of Record online: 3 AUG 2009 | DOI: 10.1002/adma.200901344

      Thumbnail image of graphical abstract

      Aligned photoluminescent fibers are formed by the self assembly of an oligo-(p-phenylenevinylene) derivative (OPV) in oriented liquid crystals (see figure). The aligned fibers of OPV show polarized yellow emission in the direction of the long axis of fibers. New types of electro-optical and photonic systems can be visualized in the future as the polarized luminescence of these fibers is combined with the dynamic properties of the liquid crystals.

    7. Effect of Molecular Morphology on Amplified Spontaneous Emission of Bis-Styrylbenzene Derivatives (pages 4034–4038)

      Ryota Kabe, Hajime Nakanotani, Tomo Sakanoue, Masayuki Yahiro and Chihaya Adachi

      Version of Record online: 28 MAY 2009 | DOI: 10.1002/adma.200803588

      Thumbnail image of graphical abstract

      Molecular aggregation greatly affects the fluorescence quantum efficiency, transient lifetime, and amplified spontaneous emission (ASE) of bis-styrylbenzene derivatives. We compare the optical properties for various morphologies (solution, film, doped film, and single crystalline state) (see figure) and demonstrate that ambipolar operation of a 1,4-bis(4-methylstyryl) benzene layer in field-effect transistors leads to intense blue electroluminescence with a rather sharp emission width.

    8. Localized Synthesis of Metal Nanoparticles Using Nanoscale Corona Discharge in Aqueous Solutions (pages 4039–4044)

      Sayan Bhattacharyya, David Staack, Elina A. Vitol, Riju Singhal, Alexander Fridman, Gary Friedman and Yury Gogotsi

      Version of Record online: 24 JUN 2009 | DOI: 10.1002/adma.200900673

      Thumbnail image of graphical abstract

      Highly localized and controlled metal nanoparticle synthesis using nanoscale corona discharge in aqueous solutions is illustrated. As a case study, gold nanoparticles are successfully deposited at the very tip of carbon nanopipettes to act as surface-enhanced Raman spectroscopy (SERS) probes.

    9. Magnetically Triggered Reversible Controlled Drug Delivery from Microfabricated Polymeric Multireservoir Devices (pages 4045–4049)

      Kaiyong Cai, Zhong Luo, Yan Hu, Xiuyong Chen, Yanjian Liao, Li Yang and Linhong Deng

      Version of Record online: 28 MAY 2009 | DOI: 10.1002/adma.200900593

      Thumbnail image of graphical abstract

      The pulsed reversible release of dual drugs from biodegradable polymeric multireservoir devices is successfully demonstrated. The controlled release is achieved by incorporating magnetic particles in the devices as switch carriers. It is possible to intentionally switch on/off the drug release at any desired time for a chosen duration.

    10. Low-Cost Fabrication of Transparent Hard Replica Molds for Imprinting Lithography (pages 4050–4053)

      Joohee Kim, Mihee Kim, Min Jung Lee, Ji Soo Lee, Kyusoon Shin and Youn Sang Kim

      Version of Record online: 2 JUN 2009 | DOI: 10.1002/adma.200803243

      Thumbnail image of graphical abstract

      A new and cost-effective replica fabrication method for transparent and hard molds used in imprinting lithography is presented. The process uses a polymer copy as a carrier. Replicated hard molds eliminate the need for direct contact between the master and the patterned polymer on the substrate, and thus reduce contamination of the master.

    11. Synthesis of Half-Channels by the Anionic Polymerization of Ethylene Oxide Initiated by Modified Cyclodextrin (pages 4054–4057)

      Nezha Badi, Loïc Auvray and Philippe Guégan

      Version of Record online: 2 JUN 2009 | DOI: 10.1002/adma.200802982

      Thumbnail image of graphical abstract

      Amphiphilic star-shaped oligomers are produced by anionic polymerization of ethylene oxide (EO) using per-2,3-di-O-heptyl-β-(or γ)cyclodextrins as initiators — a versatile way of synthesizing artificial channels bearing one polyEO branch per glucose unit. The behavior of the amphiphilic molecules in lipid membranes is studied by electrical measurements, which confirms the formation of transient, well-defined dimeric ionic channels (see figure).

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