Advanced Functional Materials

Cover image for Advanced Functional Materials

June 24, 2008

Volume 18, Issue 12

Pages 1715–1864

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Full Papers
    6. Correction
    7. Index
    1. Cover Picture: Surface Engineered Carboxymethylchitosan/Poly(amidoamine) Dendrimer Nanoparticles for Intracellular Targeting (Adv. Funct. Mater. 12/2008)

      Joaquim M. Oliveira, Noriko Kotobuki, Alexandra P. Marques, Rogério P. Pirraco, Johan Benesch, Motohiro Hirose, Silgia A. Costa, João F. Mano, Hajime Ohgushi and Rui L. Reis

      Article first published online: 18 JUN 2008 | DOI: 10.1002/adfm.200890045

      Thumbnail image of graphical abstract

      Highly branched, biodegradable, biocompatible macromolecular systems were developed by surface engineering poly(amidoamine) dendrimer nanoparticles with a water-soluble chitosan derivative, as reported by Joaquim M. Oliveira and co-workers on p. 1840. These structures were organized into sphere-like nanoparticles that have the potential to be used as intracellular drug-delivery carriers for a wide range of applications that require efficient intracellular delivery of biological agents tomodulate the behavior of stem cells, for example, their proliferation and differentiation. These applications might include the use of differentiation factors to act within cells (see cover) or genetic material.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Full Papers
    6. Correction
    7. Index
    1. Inside Front Cover: (Adv. Funct. Mater. 12/2008)

      Article first published online: 18 JUN 2008 | DOI: 10.1002/adfm.200890046

      Thumbnail image of graphical abstract

      Surprisingly, a simple, cost-effective, chemical binding system, that is, an epoxide group, is found to successfully compete with the expensive biological binding mechanism of extracellular matrix protein gel (ECM). Here, osteoblasts are shown to exhibit preferential adhesion to the epoxide functional monolayer (black areas) over the microcontact printed ECM (blue areas). A proliferation study and MTT test did not reveal any adverse side effects of epoxide functional monolayers on the cells.

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Full Papers
    6. Correction
    7. Index
    1. Contents: (Adv. Funct. Mater. 12/2008) (pages 1715–1721)

      Article first published online: 18 JUN 2008 | DOI: 10.1002/adfm.200890047

  4. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Full Papers
    6. Correction
    7. Index
    1. Enhanced Osteoblast Adhesion to Epoxide-Functionalized Surfaces (pages 1723–1731)

      David C. Trimbach, Brandis Keller, Rahila Bhat, Sergiy Zankovych, Rüdiger Pöhlmann, Siegmund Schröter, Jörg Bossert and Klaus D. Jandt

      Article first published online: 3 JUN 2008 | DOI: 10.1002/adfm.200701491

      Thumbnail image of graphical abstract

      Preferential adhesion of osteoblasts to epoxide areas of a micropatterned substrate is demonstrated; the substrate consists of epoxide (black areas in figure) and extracellular matrix protein gel functionalized areas (green). This result is confirmed by an adhesion study on unpatterned substrates, including tissue culture polystyrene controls. A proliferation study and MTT test did not reveal any adverse side effects of the epoxide-functionalized surfaces.

    2. MEL-type Pure-Silica Zeolite Nanocrystals Prepared by an Evaporation-Assisted Two-Stage Synthesis Method as Ultra-Low-k Materials (pages 1732–1738)

      Yan Liu, Minwei Sun, Christopher M. Lew, Junlan Wang and Yushan Yan

      Article first published online: 6 JUN 2008 | DOI: 10.1002/adfm.200701134

      Thumbnail image of graphical abstract

      An evaporation-assisted two-stage synthesis method to significantly decrease the nanocrystal size of MEL-type pure-silica zeolite (PSZ) without sacrificing crystal yield is reported. 98.4% of the primary particles, around 14 nm in size, are successfully preserved in the final suspension after evaporating 60 wt% of solvent. Ultra-low-dielectric-constant films prepared with the synthesized suspensions show minimal striations (left vs. right films in figure: 0 vs. 60 wt% evaporated) and improved mechanical strength.

    3. Nanoscale Membrane Strips for Benign Sensing of HgII Ions: A Route to Commercial Waste Treatments (pages 1739–1750)

      Sherif A. El-Safty, Deivasigamani Prabhakaran, Yoshimichi Kiyozumi and Fujio Mizukami

      Article first published online: 16 JUN 2008 | DOI: 10.1002/adfm.200800035

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      The design of chromophore probes with long hydrophobic tails into membrane discs transforms the HgII ion-sensing system into smart, stable strips with visual detection of ultratrace concentrations at the same frequency as the human eye (see figure). The optical sensor strips are easily portable and storable; they are well suited to areas of on-site and in-situ field analysis.

    4. Neural Networks Grown on Organic Semiconductors (pages 1751–1756)

      Eva Bystrenova, Marta Jelitai, Ilaria Tonazzini, Adina N. Lazar, Martin Huth, Pablo Stoliar, Chiara Dionigi, Marcello G. Cacace, Bert Nickel, Emilia Madarasz and Fabio Biscarini

      Article first published online: 12 JUN 2008 | DOI: 10.1002/adfm.200701350

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      Living neurons adhere, grow, and differentiate on pentacene thin-films of only a few monolayers thickness, whereby the thin-films remain unaltered by the interfacial forces that are exerted through the cells. Stem cells remain viable for days and form neural networks on the same material. This is an important step towards the development of bio-organic electronic transducers for cellular signals from neural networks.

    5. Bipolar Charge Transport in PCPDTBT-PCBM Bulk-Heterojunctions for Photovoltaic Applications (pages 1757–1766)

      Mauro Morana, Matthias Wegscheider, Alberta Bonanni, Nikos Kopidakis, Sean Shaheen, Markus Scharber, Zhengguo Zhu, David Waller, Russell Gaudiana and Christoph Brabec

      Article first published online: 16 JUN 2008 | DOI: 10.1002/adfm.200701428

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      The bipolar charge transport in PCPDTBT-PCBM blends, a high potential system for photovoltaic applications, is studied in detail. The results define the transport properties in the low bandgap polymer and its mixing behavior with the methanofullerene improving the understanding of the key limitations for the solar cell performances.

    6. VEGF-Functionalized Polyelectrolyte Multilayers as Proangiogenic Prosthetic Coatings (pages 1767–1775)

      Sabine Müller, Géraldine Koenig, Anne Charpiot, Christian Debry, Jean-Claude Voegel, Philippe Lavalle and Dominique Vautier

      Article first published online: 6 JUN 2008 | DOI: 10.1002/adfm.200701233

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      Polyelectrolyte multilayer films containing vascular endothelial growth factor (VEGF) stimulate adhesion and proliferation of human endothelial cells (HUVEC) on porous titanium implants. These effects result from specific activation of the VEGFR2-induced signaling pathway and activation of tyrosine-phosphorylated proteins (see figure).

    7. Individual Dissolution of Single-Walled Carbon Nanotubes by Using Polybenzimidazole, and Highly Effective Reinforcement of Their Composite Films (pages 1776–1782)

      Minoru Okamoto, Tsuyohiko Fujigaya and Naotoshi Nakashima

      Article first published online: 6 JUN 2008 | DOI: 10.1002/adfm.200701257

      Thumbnail image of graphical abstract

      Polybenzimidazole (PBI) acts as a good dispersant for single-walled carbon nanotubes (SWNTs) in both solution and film. SWNT/PBI composite films have been successfully fabricated without visible aggregation of the SWNTs. Just a small addition (0.06 wt %) of SWNTs improves the mechanical properties of the PBI films by ca. 50% (see figure) without reducing their thermal stabilities. PBI is thought to wrap around the SWNT sidewalls.

    8. Effects of Solvent Mixtures on the Nanoscale Phase Separation in Polymer Solar Cells (pages 1783–1789)

      Yan Yao, Jianhui Hou, Zheng Xu, Gang Li and Yang Yang

      Article first published online: 10 JUN 2008 | DOI: 10.1002/adfm.200701459

      Thumbnail image of graphical abstract

      The evolution of nanoscale phase separation in polymer:fullerene solar cells with mixture solvents is discussed. Optimum morphology is formed both laterally and vertically during spin-coating with better device performance. Supported by AFM, TEM, and XPS results, we proposed a model and identified relevant parameters for the additive, such as solubility and vapor pressure.

    9. Synthesis and Application of Graphitic Carbon with High Surface Area (pages 1790–1798)

      Bao Yu Xia, Jian Nong Wang, Xiao Xia Wang, Jun Jie Niu, Zhao Min Sheng, Ming Ruo Hu and Qing Chun Yu

      Article first published online: 6 JUN 2008 | DOI: 10.1002/adfm.200701263

      Thumbnail image of graphical abstract

      A new approach for the synthesis of graphitic carbon is reported. With the addition of NH4CSN, graphitic carbon shells form that have a smaller size and thinner walls (see image) and thus a much higher surface area.Supported on such carbon, Pt catalystsshow a significant improvement inelectrochemical activity over catalystssupported on carbon with a low surface area.

    10. Swelling-Agent-Free Synthesis of Siliceous and Functional Mesocellular Foam-Like Mesophases by Using a Carboxy-Terminated Triblock Copolymer (pages 1799–1808)

      Yu-Chuan Hsu, Yung-Hsun Chang and Chia-Min Yang

      Article first published online: 10 JUN 2008 | DOI: 10.1002/adfm.200701096

      Thumbnail image of graphical abstract

      Synthesis of mesocellular foam (MCF)-like silica mesophases by carboxy-terminated Pluronic P123 and without the use of a swelling agent has been discovered. MCF-like carbon materials have also been prepared by a nanocasting route. This synthesis route can also be applied to the cocondensation synthesis of functional MCF-like materials (see figure).

    11. Syntheses, Properties and Electrochemical Activity of Carbon Microtubes Modified with Amino Groups (pages 1809–1823)

      Xiaofeng Wang, Xiaoqing Liu, Linfei Lai, Siyue Li, Jian Weng, Zhimin Zhou, Qiang Cui, Xin Chen, Minyuan Cao and Qiqing Zhang

      Article first published online: 6 JUN 2008 | DOI: 10.1002/adfm.200701020

      Thumbnail image of graphical abstract

      Amino-functionalized and magnetite-encapsulated carbon microtubes (NH2-ME-CMTs) are obtained by decomposing a ferrocene/hexabromobenzene mixture in the presence of ammonia in a one-step process. The one-step method does not change the electrochemical properties or break the backbone structure of the carbon microtubes.

    12. Protein-Based Hydrogels with Tunable Dynamic Responses (pages 1824–1831)

      Zhijie Sui, William J. King and William L. Murphy

      Article first published online: 10 JUN 2008 | DOI: 10.1002/adfm.200701288

      Thumbnail image of graphical abstract

      The dynamic response of protein-based, dynamic hydrogels can be tuned via two distinct mechanisms: varying the molecular weight between crosslinks and varying the fractional mass of poly(ethylene glycol)-calmodulin conjugates in solution during crosslinking. Changes in macroscopic material properties are induced by nanometer-scale conformational change of calmodulin from an extended state to a collapsed state upon binding to a small molecule ligand.

    13. Solution-Deposited Zinc Oxide and Zinc Oxide/Pentacene Bilayer Transistors: High Mobility n-Channel, Ambipolar, and Nonvolatile Devices (pages 1832–1839)

      Bhola Nath Pal, Phylicia Trottman, Jia Sun and Howard E. Katz

      Article first published online: 10 JUN 2008 | DOI: 10.1002/adfm.200701430

      Thumbnail image of graphical abstract

      Solution-processed n-channel zinc oxide (ZnO) field effect transistors (FET) show varied charge transport properties depending on ZnO thickness and the presence of an added p-channel pentacene overlayer, including n-only, ambipolar and p-channel. The ambipolar transistor shows well-balanced hole/electron transport, and the p-channel transistor showed strong memory effects.

    14. Surface Engineered Carboxymethylchitosan/Poly(amidoamine) Dendrimer Nanoparticles for Intracellular Targeting (pages 1840–1853)

      Joaquim M. Oliveira, Noriko Kotobuki, Alexandra P. Marques, Rogério P. Pirraco, Johan Benesch, Motohiro Hirose, Silgia A. Costa, João F. Mano, Hajime Ohgushi and Rui L. Reis

      Article first published online: 10 JUN 2008 | DOI: 10.1002/adfm.200800165

      Thumbnail image of graphical abstract

      Novel highly branched biodegradable and biocompatible macromolecular systems are developed by surface engineering poly(amidoamine) dendrimer nanoparticles with a water-soluble chitosan-derivative. Such structures organize into spherelike nanoparticles that are proposed to be used as intracellular carriers of drugs such as dexamethasone aimed at controlling the behavior of stem cells, namely their proliferation and differentiation.

    15. Nanoimprint Lithography and the Role of Viscoelasticity in the Generation of Residual Stress in Model Polystyrene Patterns (pages 1854–1862)

      Yifu Ding, Hyun Wook Ro, Kyle J. Alvine, Brian C. Okerberg, Jing Zhou, Jack F. Douglas, Alamgir Karim and Christopher L. Soles

      Article first published online: 10 JUN 2008 | DOI: 10.1002/adfm.200701402

      Thumbnail image of graphical abstract

      Relaxation time map of various molecular mass polystyrene (PS) is used in thermal embossing nanoimprint lithography (NIL). With the proper selections of the imprinting temperature and time, process-induced stress can be controlled for a given PS. This effect can be directly measured by tracking the rate of the imprinted pattern leveling under thermal annealing.

  5. Correction

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Full Papers
    6. Correction
    7. Index
    1. You have free access to this content
      The Very-Low Shear Modulus of Multi-Walled Carbon Nanotubes Determined Simultaneously with the Axial Young's Modulus via in situ Experiments

      Xian-Long Wei, Yang Liu, Qing Chen, Ming-Sheng Wang and Lian-Mao Peng

      Article first published online: 18 JUN 2008 | DOI: 10.1002/adfm.200890049

      This article corrects:
  6. Index

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Full Papers
    6. Correction
    7. Index

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