Advanced Functional Materials

Cover image for Vol. 23 Issue 38

October 11, 2013

Volume 23, Issue 38

Pages 4757–4869

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    4. Masthead
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      Shape-Memory Materials: Shape-Memory Microfluidics (Adv. Funct. Mater. 38/2013) (page 4757)

      Aditya Balasubramanian, Robert Morhard and Christopher J Bettinger

      Article first published online: 8 OCT 2013 | DOI: 10.1002/adfm.201370237

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      Vascularization in complex organisms plays an important role in reducing the characteristic diffusion length scale of tissue structures with large dimensions. This work by C. J. Bettinger and co-workers defines biomimetic strategies for vascularization of synthetic shape-memory materials. On page 4832, embedded microvascular networks accelerate phase transitions and increase recovery rates in stimuli-responsive polymers by reducing the characteristic diffusion length scale of the bulk material.

  2. Inside Front Cover

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    3. Inside Front Cover
    4. Masthead
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      Molecular Electronics: Single-Crystal Organic Nanowire Electronics by Direct Printing from Molecular Solutions (Adv. Funct. Mater. 38/2013) (page 4758)

      Kyung S. Park, Boram Cho, Jangmi Baek, Jae K. Hwang, Haiwon Lee and Myung M. Sung

      Article first published online: 8 OCT 2013 | DOI: 10.1002/adfm.201370238

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      Single-crystal organic nanowires are synthesized by M. M. Sung and co-workers using the self-assembly and crystallization of organic molecules within nanoscale channels of molds. The nanowires are then directly transferred to specific positions on substrates to generate nanowire arrays via a direct printing process, liquid-bridgemediated nanotransfer molding. On page 4776, repeated application of the direct printing process is used to produce organic nanowire-integrated electronics with two- or three-dimensional complex structures on large-area flexible substrates.

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      Masthead: (Adv. Funct. Mater. 38/2013)

      Article first published online: 8 OCT 2013 | DOI: 10.1002/adfm.201370239

  4. Contents

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      Contents: (Adv. Funct. Mater. 38/2013) (pages 4759–4763)

      Article first published online: 8 OCT 2013 | DOI: 10.1002/adfm.201370240

  5. Frontispiece

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      Micropatterning: Regulation of Stem Cell Fate in a Three-Dimensional Micropatterned Dual-Crosslinked Hydrogel System (Adv. Funct. Mater. 38/2013) (page 4764)

      Oju Jeon and Eben Alsberg

      Article first published online: 8 OCT 2013 | DOI: 10.1002/adfm.201370241

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      3D, dual-crosslinked, oxidized hydrogels with spatially tunable physical properties are micropatterned on page 4765 by O. Jeon and E. Alsberg. Photoencapsulated human adipose-derived stem cell proliferation rate and osteogenic and chondrogenic differentiation are found to be functions of the micropattern size. The physical properties in this system therefore introduce a new parameter for regulating various cellular behaviors, and a novel platform for studying the proliferation and differentiation of stem cells in a spatially controlled manner for tissue engineering and regenerative medicine applications.

  6. Full Papers

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    1. Regulation of Stem Cell Fate in a Three-Dimensional Micropatterned Dual-Crosslinked Hydrogel System (pages 4765–4775)

      Oju Jeon and Eben Alsberg

      Article first published online: 11 APR 2013 | DOI: 10.1002/adfm.201300529

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      Three-dimensional micropatterning of dual-crosslinked oxidized, methacrylated alginate (OMA)/8-arm PEG amine (PEG) hydrogels containing human adipose-derived stem cells (hASCs) is employed to regulate hASC fate. The micropatterned dual-crosslinked OMA/PEG hydrogels for hASC encapsulation yield relatively uniform cell clusters, which scale in size with micropatterned dimensions.

    2. Single-Crystal Organic Nanowire Electronics by Direct Printing from Molecular Solutions (pages 4776–4784)

      Kyung S. Park, Boram Cho, Jangmi Baek, Jae K. Hwang, Haiwon Lee and Myung M. Sung

      Article first published online: 9 APR 2013 | DOI: 10.1002/adfm.201203540

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      Single-crystal organic nanowire arrays are generated by a direct printing method that enables the simultaneous synthesis, alignment, and patterning of nanowires. Repeated application of the direct printing process can be used to produce high-performance organic nanowire-integrated electronics with two- or three-dimensional complex structures.

    3. Catalytic Saloplastics: Alkaline Phosphatase Immobilized and Stabilized in Compacted Polyelectrolyte Complexes (pages 4785–4792)

      Patricia Tirado, Andreas Reisch, Emilie Roger, Fouzia Boulmedais, Loïc Jierry, Philippe Lavalle, Jean-Claude Voegel, Pierre Schaaf, Joseph B. Schlenoff and Benoît Frisch

      Article first published online: 10 APR 2013 | DOI: 10.1002/adfm.201300117

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      Alkaline phosphatase (ALP) is immobilized in compact polyelectrolyte complexes (CoPECs). The materials obtained in this way retain the biocatalytic activity of the enzyme, protect it from elevated temperature, and allow its fine tuning by salt concentration and temperature. Co-immobilization of magnetic particles yields easily handleable magnetic materials.

    4. Ductile Biodegradable Mg-Based Metallic Glasses with Excellent Biocompatibility (pages 4793–4800)

      Hai-Jun Yu, Jun-Qiang Wang, Xue-Tao Shi, Dmitri V. Louzguine-Luzgin, Hong-Kai Wu and John H. Perepezko

      Article first published online: 26 APR 2013 | DOI: 10.1002/adfm.201203738

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      Mg-based metallic glasses have good ductility and excellent cell compatibility when properly alloyed by Yb. The good bending and tensile ductility is likely due to the formation of dense shear bands and large plastic zones. The improved cell compatibility can be attributed to the good corrosion resistance and the reduced release of cations and hydrogen.

    5. Self-Defensive Biomaterial Coating Against Bacteria and Yeasts: Polysaccharide Multilayer Film with Embedded Antimicrobial Peptide (pages 4801–4809)

      G. Cado, R. Aslam, L. Séon, T. Garnier, R. Fabre, A. Parat, A. Chassepot, J.-C. Voegel, B. Senger, F. Schneider, Y. Frère, L. Jierry, P. Schaaf, H. Kerdjoudj, M.-H. Metz-Boutigue and F. Boulmedais

      Article first published online: 16 APR 2013 | DOI: 10.1002/adfm.201300416

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      Polysaccharide multilayer films, based on antimicrobial peptide functionalized hyaluronic acid as polyanion and chitosan as polycation, are deposited on planar surfaces with the aim of designing a self-defensive coating against both bacteria and yeasts.

    6. Turning ABO3 Antiferroelectrics into Ferroelectrics: Design Rules for Practical Rotation-Driven Ferroelectricity in Double Perovskites and A3B2O7 Ruddlesden-Popper Compounds (pages 4810–4820)

      Andrew T. Mulder, Nicole A. Benedek, James M. Rondinelli and Craig J. Fennie

      Article first published online: 6 MAY 2013 | DOI: 10.1002/adfm.201300210

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      A microscopic theory for hybrid improper ferroelectrics is reported, whereby a spontaneous polarization emerges from an antiferroelectric state owing to the combination of octahedral rotations and cation ordering. A materials design framework is constructed based on crystal-chemistry descriptors rooted in group theory, enabling the design of artificial oxides with large electric polarizations and small energetic switching barriers.

    7. Sensitization of Er3+ Infrared Photoluminescence Embedded in a Hybrid Organic-Inorganic Copolymer containing Octahedral Molybdenum Clusters (pages 4821–4825)

      Yann Molard, Christophe Labbé, Julien Cardin and Stéphane Cordier

      Article first published online: 18 APR 2013 | DOI: 10.1002/adfm.201300417

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      Integrating Er3+ ions in a hybrid Mo6-PMMA hybrid matrix enables the sensitization of its IR photoluminescence upon irradiation anywhere in the octahedral metallic cluster absorption band. Meanwhile, it causes a noticeable decrease of the Mo6 red luminescence. Mo6 clusters being covalently linked to polymer strands, the hybrid material shows excellent aging behavior, leaving promising perspectives for telecom applications.

    8. Interactive Growth Effects of Rare-Earth Nanoparticles on Nanorod Formation in YBa2Cu3Ox Thin Films (pages 4826–4831)

      F. Javier Baca, Timothy J. Haugan, Paul N. Barnes, Terry G. Holesinger, Boris Maiorov, Rongtao Lu, Xiang Wang, Joshua N. Reichart and Judy Z. Wu

      Article first published online: 19 APR 2013 | DOI: 10.1002/adfm.201203660

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      Average BaZrO3 nanorod lengths are shown to increase at a significantly higher rate in YBa2Cu3O7–x, compared to composite films double-doped with Y2O3 nanoparticles and BaZrO3, when the growth temperature is increased. From this, the significance of interactive effects between dopants is demonstrated; this can provide additional control over nanostructured composite films.

    9. Shape-Memory Microfluidics (pages 4832–4839)

      Aditya Balasubramanian, Robert Morhard and Christopher J Bettinger

      Article first published online: 6 MAY 2013 | DOI: 10.1002/adfm.201203618

      Thumbnail image of graphical abstract

      Vascularization in complex organisms plays an important role in reducing the characteristic diffusion length scale of tissue structures with large dimensions. This strategy is recapitulated in synthetic shape-memory materials. Vascular networks accelerate phase transitions and increase recovery rates in stimuli-responsive polymers by reducing the characteristic diffusion length scale of the bulk material.

    10. Leaf-like Graphene Oxide with a Carbon Nanotube Midrib and Its Application in Energy Storage Devices (pages 4840–4846)

      Ziyang Guo, Jie Wang, Fei Wang, DanDan Zhou, Yongyao Xia and Yonggang Wang

      Article first published online: 9 APR 2013 | DOI: 10.1002/adfm.201300130

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      A novel leaf-like graphene oxide (GO) with a carbon nanotube (CNT) midrib is prepared from vapor growth carbon fiber (VGCF) using the conventional Hummers method. The CNT midrib provides a natural electron diffusion path for this leaf-like GO, and therefore, this leaf-like GO with a CNT midrib displays excellent performance when applied in energy storage devices, including Li-O2 batteries, Li-ion batteries, and supercapacitors.

    11. Engineering of Facets, Band Structure, and Gas-Sensing Properties of Hierarchical Sn2+-Doped SnO2 Nanostructures (pages 4847–4853)

      Hongkang Wang, Kunpeng Dou, Wey Yang Teoh, Yawen Zhan, Tak Fu Hung, Feihu Zhang, Jiaqiang Xu, Ruiqin Zhang and Andrey L. Rogach

      Article first published online: 9 APR 2013 | DOI: 10.1002/adfm.201300303

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      Flower-like hierarchical SnO2 nanostructures are assembled from single-crystalline SnO2 nanosheets with high-index (11equation image) and (10equation image) exposed facets. Sn2+ self-doping leads to formation of tunable oxygen vacancy bandgap states and extended absorption in the visible spectral range. This work highlights the possibility of simultaneous engineering of surface energetics and electronic properties of SnO2 based materials.

    12. Tuning of the Photovoltaic Parameters of Molecular Donors by Covalent Bridging (pages 4854–4861)

      Dora Demeter, Victorien Jeux, Philippe Leriche, Philippe Blanchard, Yoann Olivier, Jérôme Cornil, Riccardo Po and Jean Roncali

      Article first published online: 9 APR 2013 | DOI: 10.1002/adfm.201300427

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      Covalent bridging of the dicyanovinyl group with the adjacent thiophene ring of small push-pull molecular donors based on triarylamines leads to a significant improvement of the efficiency of the resulting organic solar cells due to the simultaneous increase of the fill factor and open-circuit voltage.

    13. Large-Area Flexible Core–Shell Graphene/Porous Carbon Woven Fabric Films for Fiber Supercapacitor Electrodes (pages 4862–4869)

      Xiao Li, Xiaobei Zang, Zhen Li, Xinming Li, Peixu Li, Pengzhan Sun, Xiao Lee, Rujing Zhang, Zhenghong Huang, Kunlin Wang, Dehai Wu, Feiyu Kang and Hongwei Zhu

      Article first published online: 8 APR 2013 | DOI: 10.1002/adfm.201300464

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      Direct synthesis of multi-layer graphene and porous carbon woven composite films by chemical vapor deposition is reported. The composite films integrate the dual advantages of graphene and porous carbon, having not only the excellent electrical properties and flexibility of graphene but also the porous characteristics of amorphous carbon, creating a new platform for a variety of applications, such as supercapacitors.

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