Advanced Functional Materials

Cover image for Vol. 23 Issue 15

April 19, 2013

Volume 23, Issue 15

Pages 1857–1973

  1. Cover Picture

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      Zeolites: Hierarchical FAU- and LTA-Type Zeolites by Post-Synthetic Design: A New Generation of Highly Efficient Base Catalysts (Adv. Funct. Mater. 15/2013) (page 1857)

      Danny Verboekend, Tobias C. Keller, Sharon Mitchell and Javier Pérez-Ramírez

      Version of Record online: 14 APR 2013 | DOI: 10.1002/adfm.201370073

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      On page 1923 Javier Pérez-Ramírez and co-workers establish methods involving acid and optionally base treatments to prepare hierarchical FAU and LTA-type zeolites. By conquering the latter Al-rich frameworks, the full compositional and topological flexibility desired in the design of hierarchical zeolites by post-synthetic strategies is accomplished. Upon functionalization, the mesoporous X, Y, and A zeolites display superior performance as base catalysts. Carolina Flores is acknowledged for perfecting the cover artwork.

  2. Inside Front Cover

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      Thin Films: On Proton Conductivity in Porous and Dense Yttria Stabilized Zirconia at Low Temperature (Adv. Funct. Mater. 15/2013) (page 1858)

      Barbara Scherrer, Meike V.F. Schlupp, Dieter Stender, Julia Martynczuk, Jan G. Grolig, Huan Ma, Peter Kocher, Thomas Lippert, Michel Prestat and Ludwig J. Gauckler

      Version of Record online: 14 APR 2013 | DOI: 10.1002/adfm.201370074

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      On page 1957 Barbara Scherrer and co-workers report changes in electrical conductivity at low temperatures that occur when grain size, grain shape, and the porosity of nanoporous zirconiabased thin films are varied. The cover image shows a false-colored scanning transmission electron microscopy (STEM) image of a yttria stabilized zirconia (YSZ) thin film with a thickness of about 300 nm contacted with platinum. The bright areas within the YSZ thin film are pores, which conduct protons at temperatures below 400 °C.

  3. Back Cover

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      Carbon Nanotubes: Atomistic Investigation of Load Transfer Between DWNT Bundles “Crosslinked” by PMMA Oligomers (Adv. Funct. Mater. 15/2013) (page 1976)

      Mohammad Naraghi, Graham H. Bratzel, Tobin Filleter, Zhi An, Xiaoding Wei, SonBinh T. Nguyen, Markus J. Buehler and Horacio D. Espinosa

      Version of Record online: 14 APR 2013 | DOI: 10.1002/adfm.201370075

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      On page 1883 Markus J. Buehler, Horacio D. Espinosa, and co-workers report a study designed to probe the interfacial shear strength between carbon nanotube (CNT) bundles, which is a key element in the bottom-up hierarchical design of CNT fibers with unprecedented mechanical performance. The back cover image blends renderings from atomistic and coarse-grain molecular dynamics simulations with scanning electron microscopy images of shearing between surface-functionalized doublewalled nanotube (DWNT) bundles. The background shows a mat of CNT bundles from which a pair of bundles is selected for testing.

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      Masthead: (Adv. Funct. Mater. 15/2013)

      Version of Record online: 14 APR 2013 | DOI: 10.1002/adfm.201370076

  5. Contents

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    3. Inside Front Cover
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  6. Full Papers

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    1. Strong Spin-Lattice Coupling Through Oxygen Octahedral Rotation in Divalent Europium Perovskites (pages 1864–1872)

      Hirofumi Akamatsu, Yu Kumagai, Fumiyasu Oba, Koji Fujita, Katsuhisa Tanaka and Isao Tanaka

      Version of Record online: 19 NOV 2012 | DOI: 10.1002/adfm.201202477

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      First-principles calculations reveal that in divalent europium perovskites EuMO3 (M = Ti, Zr, and Hf), antiferomagnetic superexchange interactions via nd states of the B-site M cations (n = 3, 4, and 5, respectively) are enhanced by rotations of the MO6 octahedra. The octahedral rotations involved in a structural change from cubic equation imageto orthorhombic Pbnm structures point the M nd orbitals at the Eu sites, leading to a significant overlap between the M nd and Eu 4f orbitals.

    2. Functional Graphenic Materials Via a Johnson−Claisen Rearrangement (pages 1873–1882)

      Stefanie A. Sydlik and Timothy M. Swager

      Version of Record online: 6 NOV 2012 | DOI: 10.1002/adfm.201201954

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      The hydroxyl functionalities in graphene oxide (GO) are subjected to Johnson−Claisen rearrangement conditions, which trades the labile CO bond for a robust CC bond. Further functionalization allows for the synthesis of highly charged, water-soluble graphene. The negatively and positively charged graphenes (zeta potentials of –75 mV and +56 mV), are successfully used to build layer-by-layer (LBL) constructs.

    3. Atomistic Investigation of Load Transfer Between DWNT Bundles “Crosslinked” by PMMA Oligomers (pages 1883–1892)

      Mohammad Naraghi, Graham H. Bratzel, Tobin Filleter, Zhi An, Xiaoding Wei, SonBinh T. Nguyen, Markus J. Buehler and Horacio D. Espinosa

      Version of Record online: 6 NOV 2012 | DOI: 10.1002/adfm.201201358

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      In situ chemical vapor deposition functionalization of CNT bundles by PMMA-like oligomers enhances the shear strength of the bundle junctions by about an order of magnitude compared with “bare” van der Waals (vdW) interactions between pristine CNTs. Through a combination of nanomechanics experimental studies and multiscale simulations, the enhancement of shear strength is attributed to an interlocking mechanism of polymer chains in the bundles, dominated by vdW interactions, and stretching and alignment of chains during shearing.

    4. Nanostructured Porous Silicon-Solid Lipid Nanocomposite: Towards Enhanced Cytocompatibility and Stability, Reduced Cellular Association, and Prolonged Drug Release (pages 1893–1902)

      Dongfei Liu, Ermei Mäkilä, Hongbo Zhang, Barbara Herranz, Martti Kaasalainen, Päivi Kinnari, Jarno Salonen, Jouni Hirvonen and Hélder A. Santos

      Version of Record online: 6 NOV 2012 | DOI: 10.1002/adfm.201202491

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      Thermally hydrocarbonized porous silicon−solid lipid nanocomposites (THCPSi−SLNCs) on a ratio 1:1 prepared by the solid-in-oil-in-water emulsion solvent evaporation method are produced in order to enhance the suspensibility of the nanoparticles and the stability against aggregation in aqueous buffer solutions, as well as to increase the particle surface smoothness and cytocompatibility, reduce the particle's cellular association, increase the in vitro stability in human plasma, and prolong the loaded drug release.

    5. Mixed Aerogels from Au and CdTe Nanoparticles (pages 1903–1911)

      Thomas Hendel, Vladimir Lesnyak, Laura Kühn, Anne-Kristin Herrmann, Nadja C. Bigall, Lars Borchardt, Stefan Kaskel, Nikolai Gaponik and Alexander Eychmüller

      Version of Record online: 9 NOV 2012 | DOI: 10.1002/adfm.201201674

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      Mixed metal–semiconductor nanocrystal aerogels, which are light-emitting and highly porous macroscopic monoliths, are fabricated. Thiol-stabilized CdTe and Au nanoparticles from aqueous synthesis act as building blocks. The content and the properties of the aerogels are tuned by variation of the initial CdTe to Au nanoparticle ratio. Materials of this type combining the optical and catalytic properties of their nanoscale building blocks with very high porosity of the gel structure are of special interest for applications in nanosensing and photocatalysis.

    6. Self-Assembly of Nanostructured, Complex, Multication Films via Spontaneous Phase Separation and Strain-Driven Ordering (pages 1912–1918)

      Sung Hun Wee, Yanfei Gao, Yuri L. Zuev, Karren L. More, Jianyong Meng, Jianxin Zhong, George M. Stocks and Amit Goyal

      Version of Record online: 12 NOV 2012 | DOI: 10.1002/adfm.201202101

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      Spontaneous self-assembly of a multication nanophase in another multication matrix phase is a promising bottom-up approach to fabricate novel, nanocomposite structures for a range of applications. The first complimentary experimental and theoretical studies are reported to first understand and then control or guide the self-assembly of insulating BaZrO3 nanodots within REBa2Cu3O7–δ (RE = rare earth elements including Y, REBCO) superconducting films. The results have broad implications for fabrication of controlled self-assembled nanostructures for a range of applications via strain-tuning.

    7. A Nonvolatile Spintronic Memory Element with a Continuum of Resistance States (pages 1919–1922)

      Yeyu Fang, R. K. Dumas, T. N. Anh Nguyen, S. M. Mohseni, S. Chung, C. W. Miller and Johan Åkerman

      Version of Record online: 5 NOV 2012 | DOI: 10.1002/adfm.201202319

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      A virtually continuous range of resistance states is demonstrated in graded anisotropy pseudo spin valves. An analysis of first-order reversal curves combined with magnetic force microscopy shows that the origin of the effect is the field-dependent population of up and down domains in the free layer.

    8. Hierarchical FAU- and LTA-Type Zeolites by Post-Synthetic Design: A New Generation of Highly Efficient Base Catalysts (pages 1923–1934)

      Danny Verboekend, Tobias C. Keller, Sharon Mitchell and Javier Pérez-Ramírez

      Version of Record online: 7 NOV 2012 | DOI: 10.1002/adfm.201202320

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      Hierarchical FAU and LTA-type zeolites are prepared through post-synthetic strategies and display exceptional performance in base catalysis. A thorough characterization demonstrates that the presence of a secondary level of mesoporosity facilitates the introduction of base functionality by alkali ion exchange or nitridation in ammonia. The enhanced activity in the Knoevenagel condensation of benzaldehyde with malononitrile emphasizes that, in the design of basic zeolite catalysts, auxiliary porosity plays a key role.

    9. Self-Assembly of Selective Interfaces in Organic Photovoltaics (pages 1935–1946)

      Scott A. Mauger, Lilian Chang, Stephan Friedrich, Christopher W. Rochester, David M. Huang, Peng Wang and Adam J. Moulé

      Version of Record online: 22 NOV 2012 | DOI: 10.1002/adfm.201201874

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      It is shown that the metal capping electrode in an organic photovoltaic device affects the stratification of materials in the bulk heterojunction (BHJ) and that solvent additives can inhibit stratification. It is found that some metals can donate charge to (6,6)-phenyl-C61-butyric acid methyl ester (PCBM). The enrichment and charging of PCBM at the interface with the metal increases device power conversion efficiency.

    10. Dual-Functional Poly(3,4-ethylenedioxythiophene)/MnO2 Nanoellipsoids for Enhancement of Neurite Outgrowth and Exocytosed Biomolecule Sensing in PC12 Cells (pages 1947–1956)

      Sojin Kim, Wan-Kyu Oh, Yoon Seon Jeong and Jyongsik Jang

      Version of Record online: 2 NOV 2012 | DOI: 10.1002/adfm.201202198

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      A poly(3,4-ethylenedioxythiophene) (PEDOT)/MnO2 nanoellipsoid is fabricated for facilitating the neurite outgrowth during differentiation and detecting exocytized biomolecules from PC12 cells. PC12 cells co-incubated with PEDOT/MnO2 nanoellipsoids and nerve growth factor demonstrate enhanced neurite outgrowth. Exocytosis of catecholamines is electrically detected by a PEDOT/MnO2 nanoellipsoid sensor

    11. On Proton Conductivity in Porous and Dense Yttria Stabilized Zirconia at Low Temperature (pages 1957–1964)

      Barbara Scherrer, Meike V.F. Schlupp, Dieter Stender, Julia Martynczuk, Jan G. Grolig, Huan Ma, Peter Kocher, Thomas Lippert, Michel Prestat and Ludwig J. Gauckler

      Version of Record online: 15 NOV 2012 | DOI: 10.1002/adfm.201202020

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      The electrical conductivity below 400 °C of porous yttria stabilized zirconia (YSZ) deviates from the oxygen-ion conductivity due to proton conduction via chemisorbed water in the form of hydroxyl groups at the inner surface. Below 120 °C, proton conductivity via physisorbed water in the nanoporous microstructures sets in (Grotthuss mechanism). Dense thin films show oxygen-ion conductivity only and no proton conductivity is present.

    12. Elucidating Mechanisms of Diffusion-Based Calcium Carbonate Synthesis Leads to Controlled Mesocrystal Formation (pages 1965–1973)

      Johannes Ihli, Pieter Bots, Alexander Kulak, Liane G Benning and Fiona C Meldrum

      Version of Record online: 5 NOV 2012 | DOI: 10.1002/adfm.201201742

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      Elucidation of the changes in solution that accompany CaCO3 precipitation by the widely used ammonia diffusion method enables replication of calcite mesocrystals via a simple and highly reproducible titration-based method. The experiments also demonstrate that aggregation-based growth, which generates these complex structures, is promoted by high and constant supersaturation levels, giving insight into the mechanisms of mesocrystal formation.

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