Advanced Functional Materials

Cover image for Advanced Functional Materials

September 23, 2008

Volume 18, Issue 18

Pages 2631–2836

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Feature Article
    6. Full Papers
    7. Index
    1. Cover Picture: Uniform Rattle-type Hollow Magnetic Mesoporous Spheres as Drug Delivery Carriers and their Sustained-Release Property (Adv. Funct. Mater. 18/2008)

      Wenru Zhao, Hangrong Chen, Yongsheng Li, Liang Li, Meidong Lang and Jianlin Shi

      Article first published online: 16 SEP 2008 | DOI: 10.1002/adfm.200890072

      Thumbnail image of graphical abstract

      The cover, designed by Liangming Xiong, illustrates the work of Jianlin Shi, Wenru Zhao and co-workers that is reported on page 2780. Here, a novel kind of rattle-type hollow magnetic mesoporous sphere is described that can be used for the storage and release of ibuprofen. The material shows enhanced drug-loading capacity and reasonably high magnetization strength and is therefore expected to be suitable for targeted drug delivery.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Feature Article
    6. Full Papers
    7. Index
    1. Inside Front Cover: Photoconducting Bragg Mirrors based on TiO2 Nanoparticle Multilayers (Adv. Funct. Mater. 18/2008)

      Mauricio E. Calvo, Silvia Colodrero, T. Cristina Rojas, Juan Antonio Anta, Manuel Ocaña and Hernán Míguez

      Article first published online: 16 SEP 2008 | DOI: 10.1002/adfm.200890073

      Thumbnail image of graphical abstract

      Photoconducting Bragg mirrors are made by alternating layers of TiO2 nanoparticles of different size and aggregation state to create a periodic modulation of the refractive index. In this picture, a series of Bragg mirrors with different lattice constant, thus displaying different structural color, is shown with a TEM image of a cross section of a layer of TiO2 crystallites deposited on a silicon wafer in the background. This work, by Hernán Míguez and co-workers is described on page 2708.

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Feature Article
    6. Full Papers
    7. Index
    1. Contents: (Adv. Funct. Mater. 18/2008) (pages 2631–2638)

      Article first published online: 16 SEP 2008 | DOI: 10.1002/adfm.200890074

  4. Feature Article

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Feature Article
    6. Full Papers
    7. Index
    1. ‘Mechanical Engineering’ of Elastomeric Proteins: Toward Designing New Protein Building Blocks for Biomaterials (pages 2643–2657)

      Hongbin Li

      Article first published online: 1 SEP 2008 | DOI: 10.1002/adfm.200800480

      Thumbnail image of graphical abstract

      Enhancing the mechanical stability of a protein can be realized by mutating the protein to increase the free energy barrier for the mechanical unfolding. The mechanical stability of proteins is measured by single molecule atomic force microscopy. Strategies are being developed to rationally and systematically tune the mechanical stability of proteins.

  5. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Feature Article
    6. Full Papers
    7. Index
    1. Effect of SWNT Defects on the Electron Transfer Properties in P3HT/SWNT Hybrid Materials (pages 2659–2665)

      Jianxin Geng, Byung-Seon Kong, Seung Bo Yang, Sang Cheon Youn, Sohyun Park, Taiha Joo and Hee-Tae Jung

      Article first published online: 1 AUG 2008 | DOI: 10.1002/adfm.200800496

      Thumbnail image of graphical abstract

      P3HT/SWNT hybrids are prepared by exploiting the ππ interaction between the two components, resulting in efficient dispersion of carbon nanotubes in P3HT solution. Electron transfer takes place from the photo-excited P3HT to the carbon nanotubes; this transfer is remarkably disrupted by defects on the SWNT surfaces.

    2. Light-Emission Performance of Silicon Nanocrystals Deduced from Single Quantum Dot Spectroscopy (pages 2666–2672)

      Jan Valenta, Anna Fucikova, František Vácha, František Adamec, Jana Humpolíčková, Martin Hof, Ivan Pelant, Kateřina Kůsová, Kateřina Dohnalová and Jan Linnros

      Article first published online: 1 SEP 2008 | DOI: 10.1002/adfm.200800397

      Thumbnail image of graphical abstract

      Photoluminescence properties of individual porous silicon nanoparticles are investigated and related to the macroscopic performance of the SiO2 passivated Si nanocrystals. Combined application of both wide-field imaging microspectroscopy and confocal single-photon-counting microscopy enables detection of spectra of individual nanocrystals within porous Si grains and study of their on–off blinking statistics.

    3. Theoretical and Experimental Studies of Bending of Inorganic Electronic Materials on Plastic Substrates (pages 2673–2684)

      Sang-Il Park, Jong-Hyun Ahn, Xue Feng, Shuodao Wang, Yonggang Huang and John A. Rogers

      Article first published online: 1 SEP 2008 | DOI: 10.1002/adfm.200800306

      Thumbnail image of graphical abstract

      Various failure modes (i.e., cracking, slipping, or delamination) of single crystalline silicon ribbons on plastic substrates are observed, depending on the ribbons thickness, at large degrees of bending. These failure modes are controlled by surface strain, interfacial shear stress, and interfacial normal stress Mechanics of these modes are investigated by theoretical model.

    4. Charged Rod-Like Nanoparticles Assisting Single-Walled Carbon Nanotube Dispersion in Water (pages 2685–2691)

      Changwoo Doe, Sung-Min Choi, Steven R. Kline, Hyung-Sik Jang and Tae-Hwan Kim

      Article first published online: 1 SEP 2008 | DOI: 10.1002/adfm.200800321

      Thumbnail image of graphical abstract

      A new dispersant, charged rod-like nanoparticle (cROD), which simultaneously utilizes three different dispersion mechanisms including surfactant adsorption, polymer wrapping, and charge repulsion to synergistically enhance the dispersion of SWNTs in water has been demonstrated. Simultaneous application of the three different dispersion mechanisms is achieved by using polymerized charged rod-like nanoparticles which have hydrophobic cores surrounded by hydrophilic surfaces with controlled surface charge densities. (see figure).

    5. Soft Nanopatterning on Light-Emitting Inorganic–Organic Composites (pages 2692–2698)

      Luana Persano, Sandra Molle, Salvatore Girardo, Antonio A. R. Neves, Andrea Camposeo, Ripalta Stabile, Roberto Cingolani and Dario Pisignano

      Article first published online: 1 SEP 2008 | DOI: 10.1002/adfm.200800244

      Thumbnail image of graphical abstract

      The nanopatterning of nanocomposites made by luminescent inorganic nanocrystals and light-emitting conjugated polymers is demonstrated by soft moulding lithography. Vertical nanofluidics is exploited to overcome the polymer transport difficulties intrinsic in materials incorporating nanocrystals, and the rheology, fluorescence, absolute quantum yield, and emission directionality of the nanostructured composites are investigated.

      Corrected by:

      Correction: Soft Nanopatterning on Light-Emitting Inorganic-Organic Composites

      Vol. 19, Issue 9, Article first published online: 8 MAY 2009

    6. Formation of Chiral Mesopores in Conducting Polymers by Chiral-Lipid-Ribbon Templating and “Seeding” Route (pages 2699–2707)

      Chaxing Fan, Huibin Qiu, Juanfang Ruan, Osamu Terasaki, Yong Yan, Zhixiang Wei and Shunai Che

      Article first published online: 17 JUL 2008 | DOI: 10.1002/adfm.200701456

      Thumbnail image of graphical abstract

      Conducting polymer nanofibers with controllable chiral mesopores in the size, the shape, and handedness have been synthesized by chiral lipid ribbon templating and “seeding” route. The structure and chirality of helical ribbon-pores have been reconstructed by electron tomography.

    7. Photoconducting Bragg Mirrors based on TiO2 Nanoparticle Multilayers (pages 2708–2715)

      Mauricio E. Calvo, Silvia Colodrero, T. Cristina Rojas, Juan Antonio Anta, Manuel Ocaña and Hernán Míguez

      Article first published online: 1 SEP 2008 | DOI: 10.1002/adfm.200800039

      Thumbnail image of graphical abstract

      Photoconducting multilayer films of TiO2 nanoparticles that display bright structural color (see figure) are presented. This effect results from the modulation of the refractive index in 1D, which is achieved by controlling the degree of porosity of each layer. The photoelectric response of the films is determined by the interplay between the photonic and conducting properties of the ensemble.

    8. Evaluation of Digitally Encoded Layer-by-layer Coated Microparticles as Cell Carriers (pages 2716–2723)

      Farzaneh Fayazpour, Bart Lucas, Roosmarijn E. Vandenbroucke, Stefaan Derveaux, Jan Tavernier, Sam Lievens, Joseph Demeester and Stefaan C. De Smedt

      Article first published online: 1 SEP 2008 | DOI: 10.1002/adfm.200800255

      Thumbnail image of graphical abstract

      Photophysically encoded microparticles coated with polyelectrolytes and magnetic nanoparticles by a layer-by-layer method allow the growth of cells on their suface. The digital code in the microcarriers maintains its readability by confocal laser scanning microscopy. Cells grown on the polyelectrolyte layer can become transduced by adenoviral particles hosted by the polyelectrolyte layer. The encoded microcarriers are promising materials for use in biomedical and pharmaceutical in-vitro research where cells are used as tools.

    9. An Alternative Copolymer of Carbazole and Thieno[3,4b]-Pyrazine: Synthesis and Mercury Detection (pages 2724–2732)

      Yingping Zou, Meixiu Wan, Guangyi Sang, Mingfu Ye and Yongfang Li

      Article first published online: 20 AUG 2008 | DOI: 10.1002/adfm.200800567

      Thumbnail image of graphical abstract

      A donor-π-acceptor alternative copolymer of carbazole and a thieno[3,4b]-pyrazine unit [P(CZ-TPZ)] is synthesized by the Wittig–Horner reaction. P(CZ-TPZ) can be used as Hg2+ chemosensor by dual-channel assays of colorimetry and fluorometry with high selectivity and high sensitivity. This is the first report on the pyrazine-containing polymers that show an interesting Hg2+ sensing ability.

    10. Hierarchical Inorganic–Organic Nanocomposites Possessing Amphiphilic and Morphological Complexities: Influence of Nanofiller Dispersion on Mechanical Performance (pages 2733–2744)

      Jinqi Xu, Jeremy W. Bartels, David A. Bohnsack, Tzu-Chia Tseng, Michael E. Mackay and Karen L. Wooley

      Article first published online: 1 SEP 2008 | DOI: 10.1002/adfm.200701490

      Thumbnail image of graphical abstract

      Amphiphilic crosslinked nanocomposites possessing ternary compositions and complex morphologies are prepared from hyperbranched fluoropolymers, poly(ethylene glycol), and single-walled CNTs or Si nanoparticles. The composites exhibit unique mechanical properties: the tensile moduli are dependent upon physical or chemical incorporation of the nanofillers, the surface chemistry, and whether the entire complex material is dry or swollen with water.

    11. Platinum Lead Nanostructures: Formation, Phase Behavior, and Electrocatalytic Properties (pages 2745–2753)

      Shengchun Yang, Zhenmeng Peng and Hong Yang

      Article first published online: 1 SEP 2008 | DOI: 10.1002/adfm.200800266

      Thumbnail image of graphical abstract

      The synthesis and electrocatalytic property of both face-centered cubic and hexagonal close-packed PtPb nanorods are described. The platinum-rich cubic Pt100−xPbx nanorods form first while the thermodynamically stable hexagonal Pt50Pb50 forms at a relatively long reaction time or high temperature. These PtPb alloys show very high mass current density in methanol oxidation reaction in comparison to pure platinum.

    12. Solution-Processible Red Iridium Dendrimers based on Oligocarbazole Host Dendrons: Synthesis, Properties, and their Applications in Organic Light-Emitting Diodes (pages 2754–2762)

      Junqiao Ding, Jianhong Lü, Yanxiang Cheng, Zhiyuan Xie, Lixiang Wang, Xiabin Jing and Fosong Wang

      Article first published online: 1 SEP 2008 | DOI: 10.1002/adfm.200800259

      Thumbnail image of graphical abstract

      Multifunctional red iridium dendrimers suitable to low-cost solution processing technologies have been synthesized and used for electrophosphorescent devices by associating oligocarbazole host as dendrons with red emissive Ir complex dopant as the core. With the third-generation dendrimer red-G3, the peak external quantum efficiencies of 6.3% for non-doped devices and 11.9% for doped devices have been demonstrated, which are well comparable with those of vacuum-deposited small molecular phosphors.

    13. Bulk Synthesis and Surface Patterning of Nanoporous Metals and Alloys from Supraspherical Nanoparticle Aggregates (pages 2763–2769)

      Rafal Klajn, Timothy P. Gray, Paul J. Wesson, Benjamin D. Myers, Vinayak P. Dravid, Stoyan K. Smoukov and Bartosz A. Grzybowski

      Article first published online: 1 SEP 2008 | DOI: 10.1002/adfm.200800293

      Thumbnail image of graphical abstract

      Supraspheres composed of hundreds to thousands of metal nanoparticles adhere to one another and assemble into extended networks of microscopic dimensions. Upon heating and removal of coating organics, the nanoparticles comprising these structures coalesce and gradually transform into nanoporous metals. By adjusting the compositions and sizes of the supraspheres, it is possible to prepare mono- and multicomponent materials with controlled porosity and surface area.

    14. Synthesis, Characterization, Two-Photon Absorption, and Optical Limiting Properties of Ladder-Type Oligo-p-phenylene-Cored Chromophores (pages 2770–2779)

      Qingdong Zheng, Sandesh K. Gupta, Guang S. He, Loon-Seng Tan and Paras N. Prasad

      Article first published online: 21 JUL 2008 | DOI: 10.1002/adfm.200800419

      Thumbnail image of graphical abstract

      A series of ladder-type oligo-p-phenylene-cored chromophores are synthesized and characterized. For the ladder-type tetraphenylene cored chromophore, a strong two-photon excited fluorescence can be easily observed even with an unfocused laser beam (see graphic). An improved optical limiting behavior was demonstrated using the ladder-type pentaphenylene cored chromophore.

    15. Uniform Rattle-type Hollow Magnetic Mesoporous Spheres as Drug Delivery Carriers and their Sustained-Release Property (pages 2780–2788)

      Wenru Zhao, Hangrong Chen, Yongsheng Li, Liang Li, Meidong Lang and Jianlin Shi

      Article first published online: 1 SEP 2008 | DOI: 10.1002/adfm.200701317

      Thumbnail image of graphical abstract

      A novel kind of rattle-type hollow magnetic mesoporous sphere with Fe3O4 particles encapsulated in the cores of mesoporous silica microspheres has been fabricated. The storage and release of ibuprofen, as a typical example, is demonstrated. Such a material has the merits of both enhanced drug-loading capacity and significant magnetization strength and is expected to be applied to targeted drug delivery.

    16. Dependence of Transformation Temperatures of NiTi-based Shape-Memory Alloys on the Number and Concentration of Valence Electrons (pages 2789–2794)

      Mehrdad Zarinejad and Yong Liu

      Article first published online: 30 JUL 2008 | DOI: 10.1002/adfm.200701423

      Thumbnail image of graphical abstract

      Increasing valence electron concentration (cv) of NiTi-based alloys results in lower martensite start transformation temperatures (Ms). This is a consequence of higher elastic moduli of the alloys as the interatomic bonding is affected by the change in the electronic structure.

    17. Traversing the Metal-Insulator Transition in a Zintl Phase: Rational Enhancement of Thermoelectric Efficiency in Yb14Mn1−xAlxSb11 (pages 2795–2800)

      Eric S. Toberer, Catherine A. Cox, Shawna R. Brown, Teruyuki Ikeda, Andrew F. May, Susan M. Kauzlarich and G. Jeffrey Snyder

      Article first published online: 1 SEP 2008 | DOI: 10.1002/adfm.200800298

      Thumbnail image of graphical abstract

      The solid solution Yb14Mn1−xAlxSb11 shows enhancement of the thermoelectric figure of merit, zT, compared with Yb14MnSb11. Replacing Mn2+ with Al3+ reduces the concentration of charge conducting holes, leading to an increase in the Seebeck coefficient at the expense of the increased electrical resistivity. At the optimum carrier concentration, a maximum zT of 1.3 at 1223 K is obtained.

    18. The Role of the Interface in CO Oxidation on Au/CeO2 Multilayer Nanotowers (pages 2801–2807)

      Zheng Zhou, Steven Kooi, Maria Flytzani-Stephanopoulos and Howard Saltsburg

      Article first published online: 1 SEP 2008 | DOI: 10.1002/adfm.200800025

      Thumbnail image of graphical abstract

      Au/CeO2 multilayer nanotowers can be used to study CO oxidation. The activity is found to scale with the total length of Au/pCeO2 interfaces, which is varied quantitatively while the film thickness and total Au and CeO2 surface area remain fixed (see figure). Deactivation with time-on-stream is commensurate with relaxation of the gold films, as measured by a drop in their lattice strain.

    19. Luminescent Tags on Fullerenes: Eu3+ Complexes with Pendant Fullerenes (pages 2808–2814)

      Anita Fuchsbauer, Olesya A. Troshina, Pavel A. Troshin, Robert Koeppe, Rimma N. Lyubovskaya and Niyazi Serdar Sariciftci

      Article first published online: 1 SEP 2008 | DOI: 10.1002/adfm.200800377

      Thumbnail image of graphical abstract

      Eu3+ complexes with fullerene ligands for biomedical applications can be obtained via ligand exchange reaction. The complexes show the characteristic emission lines of the trivalent europium ion, therefore this is the first step towards a luminescence labeling of fullerenes soluble in aqueous or organic media.

    20. Tailor-made Polymeric Membranes based on Segmented Block Copolymers for CO2 Separation (pages 2815–2823)

      Anja Car, Chrtomir Stropnik, Wilfredo Yave and Klaus-Viktor Peinemann

      Article first published online: 1 SEP 2008 | DOI: 10.1002/adfm.200800436

      Thumbnail image of graphical abstract

      Different PEO-PBT multiblock copolymers are used to prepare carbon dioxide selective membranes. The carbon dioxide permeability runs through a maximum when plotted versus the molecular weight of the PEO block.

    21. Effect of Oligothienyl Chain Length on Tuning the Solar Cell Performance in Fluorene-Based Polyplatinynes (pages 2824–2833)

      Li Liu, Cheuk-Lam Ho, Wai-Yeung Wong, Kai-Yin Cheung, Man-Kin Fung, Wai-Ting Lam, Aleksandra B. Djurišić and Wai-Kin Chan

      Article first published online: 1 SEP 2008 | DOI: 10.1002/adfm.200800439

      Thumbnail image of graphical abstract

      Tuning the polymer solar cell efficiency and charge transport properties effectively in soluble fluorene-derived polyplatinynes by varying the chain length of oligothienyl components is described. This tuning strategy for solar energy conversion provides a novel access toward high-performance polymer solar cells and demonstrates the potential of conjugated metallopolymers for efficient power generation.

  6. Index

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

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