Advanced Materials

Cover image for Vol. 19 Issue 23

December, 2007

Volume 19, Issue 23

Pages 4091–4304

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Reports
    6. Review
    7. Communications
    8. Index
    1. Cover Picture: Reversible Control of Ordering Transitions at Aqueous/Liquid Crystal Interfaces Using Functional Amphiphilic Polymers (Adv. Mater. 23/2007)

      M. I. Kinsinger, B. Sun, N. L. Abbott and D. M. Lynn

      Version of Record online: 29 NOV 2007 | DOI: 10.1002/adma.200790091

      Thumbnail image of graphical abstract

      Functional amphiphilic polymers designed to assemble at interfaces between a nematic liquid crystal and immiscible aqueous phases trigger ordering transitions that result in changes in the optical appearance of the liquid crystal (see figure and cover). The resulting polymer-functionalized interfaces respond reversibly to changes in the pH of aqueous solutions and suggest approaches to the design of fluid interfaces that respond actively or reversibly to a broad range of environmental stimuli.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Reports
    6. Review
    7. Communications
    8. Index
    1. Inside Front Cover: Polymer–Silicon Flexible Structures for Fast Chemical Vapor Detection (Adv. Mater. 23/2007)

      S. Singamaneni, M. E. McConney, M. C. LeMieux, H. Jiang, J. O. Enlow, T. J. Bunning, R. R. Naik and V. V. Tsukruk

      Version of Record online: 29 NOV 2007 | DOI: 10.1002/adma.200790092

      Thumbnail image of graphical abstract

      Stimuli-responsive microactuators controlled by the interfacial stress across the polymer/silicon interface are introduced as simple, miniature, and flexible sensing platforms for chemical vapor detection. The sensors detect water vapor with sensitivities of ± 10 parts per billion (±0.00005% relative humidity) and faster than previously recorded response times. These characteristics make the bimaterial silicon cantilevers excellent candidates for critical security and defense needs as well as for environmental monitoring.

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Reports
    6. Review
    7. Communications
    8. Index
  4. Progress Reports

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Reports
    6. Review
    7. Communications
    8. Index
    1. Electrostatic Properties of Ideal and Non-ideal Polar Organic Monolayers: Implications for Electronic Devices (pages 4103–4117)

      A. Natan, L. Kronik, H. Haick and R. T. Tung

      Version of Record online: 29 NOV 2007 | DOI: 10.1002/adma.200701681

      Thumbnail image of graphical abstract

      The properties of polar organic monolayers and their main uses in shaping the properties of electronic devices are reviewed and explained. We emphasize the role of long-range, cooperative effects and the differences between the electrical properties of uniform and non-uniform monolayers.

    2. Peeling Back the Layers: Controlled Erosion and Triggered Disassembly of Multilayered Polyelectrolyte Thin Films (pages 4118–4130)

      D. M. Lynn

      Version of Record online: 31 OCT 2007 | DOI: 10.1002/adma.200701748

      Thumbnail image of graphical abstract

      Layer-by-layer deposition can be used to assemble thin multilayered films using a broad range of materials. These methods provide new opportunities to design thin films that provide spatial, temporal, or active control over the release of incorporated agents. In this Progress Report, we highlight recent work toward the design of multilayered films that permit control over film erosion and provide opportunities for the localized release of macromolecules, such as DNA and proteins, from surfaces.

  5. Review

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Reports
    6. Review
    7. Communications
    8. Index
    1. Increasing the Complexity of Magnetic Core/Shell Structured Nanocomposites for Biological Applications (pages 4131–4144)

      V. Salgueiriño-Maceira and M. A. Correa-Duarte

      Version of Record online: 31 OCT 2007 | DOI: 10.1002/adma.200700418

      Thumbnail image of graphical abstract

      Core/shell structured nanoparticles can be prepared with features that combine properties of different materials and can therefore be classified by how these features are distributed in the final morphology, attending to connected or isolated materials which end up in interacting or not interacting functionalities. In particular, we have focused on magnetic core/shell structured particles with a directly connected, coupled, or isolated second functionality.

  6. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Reports
    6. Review
    7. Communications
    8. Index
    1. Electro-Optical Switching in a Blue Phase III Exhibited by a Chiral Liquid Crystal Oligomer (pages 4145–4148)

      M. Sato and A. Yoshizawa

      Version of Record online: 31 OCT 2007 | DOI: 10.1002/adma.200700903

      Thumbnail image of graphical abstract

      The fast electric-field-induced phase transition from blue phase III (BPIII) to nematic (N) phase of a newly designed chiral liquid crystal possessing molecular biaxiality (see figure) is reported. The present finding can offer fast electro-optical switching between a well black state of the BPIII and a homogeneous bright state of the induced N phase without surface treatment.

    2. Microfabrication of Anisotropic Organic Materials via Self-Organization of an Ionic Perylenemonoimide (pages 4149–4152)

      L. Huang, S.-W. Tam-Chang, W. Seo and K. Rove

      Version of Record online: 12 NOV 2007 | DOI: 10.1002/adma.200700085

      Thumbnail image of graphical abstract

      Ionic perylenemonoimide (see figure) forms crystals that exhibit dichroic absorption and anisotropic fluorescence emission in the visible light region. The self-organization of this compound on a micropatterned polymer template leads to the formation of anisotropic fluorescent materials in micropatterns.

    3. Tailoring the Properties of Artificially Layered Ferroelectric Superlattices (pages 4153–4159)

      M. Dawber, N. Stucki, C. Lichtensteiger, S. Gariglio, P. Ghosez and J.-M. Triscone

      Version of Record online: 12 NOV 2007 | DOI: 10.1002/adma.200700965

      Thumbnail image of graphical abstract

      The polarization of PbTiO3/SrTiO3superlattices is experimentally tuned from 0–60 μC/cm–2 and the transition temperature from room temperature to 1000 K while maintaining a perfect crystal structure and low leakage currents (see figure). A simple model based on Landau theory is developed as a guide for the straightforward production of samples with ferroelectric properties designed for particular applications.

    4. Novel Thiophene-Thiazolothiazole Copolymers for Organic Field-Effect Transistors (pages 4160–4165)

      I. Osaka, G. Sauvé, R. Zhang, T. Kowalewski and R. D. McCullough

      Version of Record online: 30 OCT 2007 | DOI: 10.1002/adma.200701058

      Thumbnail image of graphical abstract

      A semiconducting polymer bearing the thiazolothiazole moiety in the polythiophene backbone (see figure) is synthesized. The polymer is found to have small bandgap and large ionization potential. Despite the low molecular weight, the polymer exhibited a high field-effect mobility after annealing. A high on/off ratio suggests the polymer possesses high stability against oxygen doping. The polymer device also showed good environmental stability.

    5. Efficient Solar Cells Using All-Organic Nanocrystalline Networks (pages 4166–4171)

      F. Yang, K. Sun and S. R. Forrest

      Version of Record online: 26 OCT 2007 | DOI: 10.1002/adma.200700837

      Thumbnail image of graphical abstract

      A full-organic donor/acceptor (DA) network formed by crystalline molecules is introduced to organic solar cells. Structural analysis shows that the network is composed of donor and acceptor nanocrystals. The increased DA interface area increases photo current generation and the interconnected networks form conductive pathways for charge extraction. The solar cell using nanocrystalline DA network shows a three-fold improvement on photocurrent over that of a bilayer cell using the same DA combination.

    6. A Bit per Particle: Electrostatic Assembly of CdSe Quantum Dots as Memory Elements (pages 4172–4176)

      B. C. Das, S. K. Batabyal and A. J. Pal

      Version of Record online: 30 OCT 2007 | DOI: 10.1002/adma.200700309

      Thumbnail image of graphical abstract

      Two-dimensional arrays of CdSe nanoparticles are fabricated via electrostatic assembly. The size of the particles ranges down to the quantum dot regime. Individual particles and arrays of particles exhibit electrical bistability and associated memory phenomenon. The bistability, which is due to charge confinement in the particles, results in experimental evidence of quantum dots as memory elements storing a bit per particle (see figure).

    7. Enhanced Photoconductivity in Thin-Film Semiconductors Optically Coupled to Photonic Crystals (pages 4177–4182)

      P. G. O'Brien, N. P. Kherani, S. Zukotynski, G. A. Ozin, E. Vekris, N. Tetreault, A. Chutinan, S. John, A. Mihi and H. Míguez

      Version of Record online: 12 NOV 2007 | DOI: 10.1002/adma.200700564

      Thumbnail image of graphical abstract

      The photoconductivity of a thin semiconductor film is enhanced by depositing a photonic crystal layer on its backside. As shown in the figure, simulations indicate that the enhanced photoconductivity arises from the resonant modes in the film–photonic-crystal constructs and exceeds the enhancement obtained by depositing a perfect mirror onto the film.

      Corrected by:

      Correction: Enhanced Photoconductivity in Thin-Film Semiconductors Optically Coupled to Photonic Crystals

      Vol. 19, Issue 24, 4326, Version of Record online: 11 DEC 2007

    8. Quasi-ternary Nanoparticle Superlattices Through Nanoparticle Design (pages 4183–4188)

      E. V. Shevchenko, J. Kortright, D. V. Talapin, S. Aloni and A. P. Alivisatos

      Version of Record online: 12 NOV 2007 | DOI: 10.1002/adma.200701470

      Thumbnail image of graphical abstract

      Three component nanoparticle superlattices that are isostructural with binary ionic and intermetallic compounds are obtained by co-crystallization of multi-component nanoparticles (see figure). Self-assembly of multicomponent nanoparticles greatly extends the combinations of possible materials types which can be intermixed on the nanoscale.

    9. Electron Beam Projection Nanopatterning Using Crystal Lattice Images Obtained from High Resolution Transmission Electron Microscopy (pages 4189–4193)

      H.-S. Lee, B.-S. Kim, H.-M. Kim, J.-S. Wi, S.-W. Nam, K.-B. Jin, Y. Arai and K.-B. Kim

      Version of Record online: 12 NOV 2007 | DOI: 10.1002/adma.200701119

      Thumbnail image of graphical abstract

      An electron beam projection lithography technique that employs the various crystalline lattice images available in high-resolution transmission electron microscopy is reported. We successfully fabricated periodic arrays of various patterned structures with feature sizes of about 25 nm using single-crystalline Si and β-Si3N4 as the mask materials.

    10. Aligned Nanocables: Controlled Sheathing of CuO Nanowires by a Self-Assembled Tubular Glycolipid (pages 4194–4197)

      Y. Zhou, S. Kamiya, H. Minamikawa and T. Shimizu

      Version of Record online: 29 NOV 2007 | DOI: 10.1002/adma.200701189

      Thumbnail image of graphical abstract

      Aligned nanocables, consisting of CuO nanowire cores and lipid nanotube shells, are prepared by sheathing an aligned array of CuO nanowires with a self-assembled tubular glycolipid (see figure). The sheath thickness of the nanocable is tunable by changing the incubation temperature of the lipid on the CuO nanowire.

    11. Ultrastrong, Stiff, and Lightweight Carbon-Nanotube Fibers (pages 4198–4201)

      X. Zhang, Q. Li, T. G. Holesinger, P. N. Arendt, J. Huang, P. D. Kirven, T. G. Clapp, R. F. DePaula, X. Liao, Y. Zhao, L. Zheng, D. E. Peterson and Y. Zhu

      Version of Record online: 31 OCT 2007 | DOI: 10.1002/adma.200700776

      Thumbnail image of graphical abstract

      Carbon nanotube (CNT) fibers that are many times stronger and stiffer per weight than the best existing engineering fibers and over twenty times better than other reported CNT fibers are described (see figure). Additionally, these CNT fibers are nonbrittle and tough, making them far superior to existing materials for preventing catastrophic failure.

    12. Injection-induced De-doping in a Conducting Polymer during Device Operation: Asymmetry in the Hole Injection and Extraction Rates (pages 4202–4207)

      P.-J. Chia, L.-L. Chua, S. Sivaramakrishnan, J.-M. Zhuo, L.-H. Zhao, W.-S. Sim, Y.-C. Yeo and P. K-H. Ho

      Version of Record online: 7 NOV 2007 | DOI: 10.1002/adma.200700086

      Thumbnail image of graphical abstract

      A mechanism is described that can alter the doping level of conducting polymers during normal electrical injection, which arises from differential charge extraction/ injection into transport sites, and which is likely to be an intrinsic feature of the hopping transport itself. This and not Joule heating is the cause of the conductance decay in PEDT:PSS at strong electrical injection, in which the polyelectrolyte counter-ion also plays a key role. Neutral (non-acidic) PEDT:PSS is more stable in this regard.

    13. Reversible Control of Ordering Transitions at Aqueous/Liquid Crystal Interfaces Using Functional Amphiphilic Polymers (pages 4208–4212)

      M. I. Kinsinger, B. Sun, N. L. Abbott and D. M. Lynn

      Version of Record online: 31 OCT 2007 | DOI: 10.1002/adma.200700718

      Thumbnail image of graphical abstract

      Functional amphiphilic polymers designed to assemble at interfaces between a nematic liquid crystal and immiscible aqueous phases trigger ordering transitions that result in changes in the optical appearance of the liquid crystal (see figure and cover). The resulting polymer-functionalized interfaces respond reversibly to changes in the pH of aqueous solutions and suggest approaches to the design of fluid interfaces that respond actively or reversibly to a broad range of environmental stimuli.

    14. Formation of the Interfacial Dipole at Organic-Organic Interfaces: C60/Polymer Interfaces (pages 4213–4217)

      W. Osikowicz, M. P. de Jong and W. R. Salaneck

      Version of Record online: 31 OCT 2007 | DOI: 10.1002/adma.200700622

      Thumbnail image of graphical abstract

      Conditions for spontaneous charge transfer across C60/polymer interfaces (in the ground state) are mapped out with aid of photoelectron spectroscopy. The polymers and C60 interact weakly, i.e., the electronic states of the organic semiconductors are coupled only by tunneling, which in turn results in transfer of complete charges across interfaces.

    15. Ultrathin Multilayered Films Assembled from “Charge-Shifting” Cationic Polymers: Extended, Long-Term Release of Plasmid DNA from Surfaces (pages 4218–4223)

      J. Zhang and D. M. Lynn

      Version of Record online: 7 NOV 2007 | DOI: 10.1002/adma.200701028

      Thumbnail image of graphical abstract

      Ultrathin multilayered films can be designed to release plasmid DNA for three months by using side-chain functionalized ‘charge-shifting' cationic polymers. Slow hydrolysis of the side chains of these polymers facilitates film disruption and release of DNA over periods longer than films fabricated using degradable cationic polymers, and suggests approaches to the fabrication of thin films for the localized and long-term release of DNA, proteins, or other agents from surfaces.

    16. Three-Color White Electroluminescence from a Single Polymer System with Blue, Green and Red Dopant Units as Individual Emissive Species and Polyfluorene as Individual Polymer Host (pages 4224–4228)

      J. Liu, L. Chen, S. Y. Shao, Z. Y. Xie, Y. X. Cheng, Y. H. Geng, L. X. Wang, X. B. Jing and F. S. Wang

      Version of Record online: 12 NOV 2007 | DOI: 10.1002/adma.200701104

      Thumbnail image of graphical abstract

      A white electroluminescent single polymer system with both high electroluminescence efficiency and excellent color rendering index (CRI) value is developed by covalently attaching blue, green, and red dopant units as individual light-emitting species to the side chain of polyfluorene as individual polymer host. A luminous efficiency of 8.6 cd A–1, CIE coordinates of (0.33, 0.36) and CRI value of 88 was demonstrated with their single-layer devices.

    17. Growth of an Ordered Crystalline Organic Heterojunction (pages 4229–4233)

      R. R. Lunt, J. B. Benziger and S. R. Forrest

      Version of Record online: 12 NOV 2007 | DOI: 10.1002/adma.200701572

      Thumbnail image of graphical abstract

      A several-hundred Ångstrom thick ordered crystalline organic heterojunction consisting of copper phthalocyanine (CuPc) and 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) is grown by organic vapor phase deposition (OVPD) on a template alkali- halide substrate. This method of low-temperature thin-film templating combines the control of film growth with crystalline ordering approaching that of organic single crystals, producing potentially useful heterojunctions for high efficiency organic thin-film devices.

    18. Micropumps Based on the Enhanced Electroosmotic Effect of Aluminum Oxide Membranes (pages 4234–4237)

      J.-Y. Miao, Z.-L. Xu, X.-Y. Zhang, N. Wang, Z-Y. Yang and P. Sheng

      Version of Record online: 12 NOV 2007 | DOI: 10.1002/adma.200700767

      Thumbnail image of graphical abstract

      We have successfully decorated Micro-/nanochannel surfaces of annealed anodic aluminum oxide (AAO) membranes are decorated to greatly enhance their electroosmotic effect as well as the structural stability. The micro/nanopumps made from annealed AAO membranes with thin silica coating on the inner surfaces of the nanochannels exhibited a large dynamic range of pumping rates, low operating voltages and high maximum flow rates.

    19. Biomimetic pH Sensitive Polymersomes for Efficient DNA Encapsulation and Delivery (pages 4238–4243)

      H. Lomas, I. Canton, S. MacNeil, J. Du, S. P. Armes, A. J. Ryan, A. L. Lewis and G. Battaglia

      Version of Record online: 12 NOV 2007 | DOI: 10.1002/adma.200700941

      Thumbnail image of graphical abstract

      A novel gene delivery vector based on the ability of a synthetic amphiphilic block copolymer to mimic biological phospholipids by forming membrane-enclosed structures, specifically nanometer-sized vesicles, is presented. A pH-sensitive diblock copolymer forms vesicles (polymersomes) at neutral pH, and dissolves completely as unimers at endocytic pH (see figure). GFP-encoding plasmid DNA are successfully encapsulated inside the polymer vesicles, and delivered intracellularly.

    20. Magnetically Anisotropic Cobalt and Iron Nanofibers via Electrospinning (pages 4244–4247)

      M. Graeser, M. Bognitzki, W. Massa, C. Pietzonka, A. Greiner and J. H. Wendorff

      Version of Record online: 12 NOV 2007 | DOI: 10.1002/adma.200700849

      Thumbnail image of graphical abstract

      Magnetically anisotropic cobalt and iron nanofibers (see figure) are obtained via oriented polymer-supported electrospinning and subsequent reduction and thermal treatment. The cobalt and iron nature of the fibers is confirmed by XRD analysis. Fibers of both metals show ferromagnetic behavior. Parallel aligned iron nanofibers revealed anisotropic hysteresis loops depending on field-fiber orientation.

    21. Polymer–Silicon Flexible Structures for Fast Chemical Vapor Detection (pages 4248–4255)

      S. Singamaneni, M. E. McConney, M. C. LeMieux, H. Jiang, J. O. Enlow, T. J. Bunning, R. R. Naik and V. V. Tsukruk

      Version of Record online: 12 NOV 2007 | DOI: 10.1002/adma.200701419

      Thumbnail image of graphical abstract

      Stimuli-responsive microactuators controlled by the interfacial stress across the polymer/silicon interface are introduced as simple, miniature, and flexible sensing platforms for chemical vapor detection. The sensors detect water vapor with sensitivities of ± 10 parts per billion (±0.00005% relative humidity) and faster than previously recorded response times. These characteristics make the bimaterial silicon cantilevers excellent candidates for critical security and defense needs as well as for environmental monitoring.

    22. Highly Ordered Pd Nanowire Arrays as Effective Electrocatalysts for Ethanol Oxidation in Direct Alcohol Fuel Cells (pages 4256–4259)

      C. W. Xu, H. Wang, P. K. Shen and S. P. Jiang

      Version of Record online: 12 NOV 2007 | DOI: 10.1002/adma.200602911

      Thumbnail image of graphical abstract

      Pd nanowire arrays (NWAs) with high electrochemically active surface area (see figure) are successfully fabricated using anodized aluminum oxide electrodeposition. The electrocatalytic activity and stability of the Pd NWAs for ethanol electrooxidation are not only significantly higher that of conventional Pd film electrodes, but also higher than that of well-established commercial PtRu/C electrocatalysts. The Pd NWAs show great potential as electrocatalysts for ethanol electrooxidation in alkaline media in direct ethanol fuel cells.

    23. Progress in Rechargeable Magnesium Battery Technology (pages 4260–4267)

      D. Aurbach, G. S. Suresh, E. Levi, A. Mitelman, O. Mizrahi, O. Chusid and M. Brunelli

      Version of Record online: 14 NOV 2007 | DOI: 10.1002/adma.200701495

      Thumbnail image of graphical abstract

      A new generation of rechargeable magnesium batteries with improved performance is presented. The cathodes are Chevrel phases of the Mo6S8-ySey (y =0, 1, 2) type. The partial substitution of S by Se in these materials enables a very fast and reversible Mg intercalation at capacities close to the theoretical values, due to structural changes in the Mg insertion sites and increase in the polarizability of the anionic framework of the host. New electrolyte solutions with electrochemical windows wider than 3 V are also briefly reported.

    24. e-Beam Nanopatterned Photo-Responsive Bacteriorhodopsin-Containing Hydrogels (pages 4268–4271)

      I. Saaem and J. Tian

      Version of Record online: 12 NOV 2007 | DOI: 10.1002/adma.200701401

      Thumbnail image of graphical abstract

      A photoresponsive nanopatterned hydrogel is demonstrated by combining a pH-sensitive polyelectrolyte, poly(acrylic acid), with bacteriorhodopsin, a light-activated proton pump capable of causing local pH changes. Utilizing electron-beam lithography (EBL) on glass substrates, surface-attached, nanopatterned hydrogels were fabricated capable of de-swelling upon green light illumination.

    25. Bulk Metallic Glass with Benchmark Thermoplastic Processability (pages 4272–4275)

      G. Duan, A. Wiest, M. L. Lind, J. Li, W.-K. Rhim and W. L. Johnson

      Version of Record online: 14 NOV 2007 | DOI: 10.1002/adma.200700969

      Thumbnail image of graphical abstract

      Simple microreplication experiments carried out in open air using relatively low applied pressures demonstrate superior thermoplastic processability of newly designed bulk metallic glass. It is the microformed impression of a United States dime coin (see figure) made on the surface of metallic glass wafers at ∼370 °C. This bulk metallic glass exhibits benchmark characteristics of thermoplastic processing and will hopefully broaden the engineering applications of amorphous metals.

    26. Inorganic Nanotubes as Nanoreactors: The First MoS2 Nanopods (pages 4276–4278)

      M. Remškar, A. Mrzel, M. Viršek and A. Jesih

      Version of Record online: 14 NOV 2007 | DOI: 10.1002/adma.200701784

      Thumbnail image of graphical abstract

      MoS2nanopods, spherical MoS2 nanoparticles grow in a confined geometry of MoS2 nanotube reactors, which subsequently serve as nanocontainers and enable safe handling and simple release of the particles on stimulation.

    27. The Effect of Template Phase on the Structures of As-Synthesized Silica Nanoparticles with Fragile Didodecyldimethylammonium Bromide Vesicles as Templates (pages 4279–4283)

      L. X. Zhang, P. C. Li, X. H. Liu, L. W. Du and E. K. Wang

      Version of Record online: 14 NOV 2007 | DOI: 10.1002/adma.200701228

      Thumbnail image of graphical abstract

      The effect of template phase on the structures of as-synthesized silica nanoparticles with fragile DDAB vesicles as templates is reported. It is found that the template phase plays a critical role in the growth process of silica: the unstable DDAB vesicles in liquid-crystalline phase often lead to the formation of mesostructured solid spheres, and the rather stable DDAB vesicles in gel phase lead to the formation of hollow spheres with less mesostructures.

    28. Transparent Film Heater Using Single-Walled Carbon Nanotubes (pages 4284–4287)

      Y.-H. Yoon, J.-W. Song, D. Kim, J. Kim, J.-K. Park, S.-K. Oh and C.-S. Han

      Version of Record online: 29 NOV 2007 | DOI: 10.1002/adma.200701173

      Thumbnail image of graphical abstract

      A transparent heater is produced from single-walled carbon nanotubes (SWCNTs) with a high thermal conductivity. A transparent conducting SWCNT film is fabricated on glass or polymer substrates by using a vacuum infiltration method. SWCNT films with a transparency of 65–97 % and a sheet resistance of 230–3500 Ω square–1 are demonstated. These films are good candidates for many applications that require transparent film heaters.

    29. B6O-Based Composite to Rival Polycrystalline Cubic Boron Nitride (pages 4288–4291)

      C. Chen, D. He, Z. Kou, F. Peng, L. Yao, R. Yu and Y. Bi

      Version of Record online: 29 NOV 2007 | DOI: 10.1002/adma.200700836

      Thumbnail image of graphical abstract

      A one-step sintering process is developed to prepare nanostructured super-hard B6O?B4C compacts (see figure) from a mixture of B, B2O3, and B4C precursors at a mild pressure of ∼3GPa and high temperatures ranging from 1500–1900 K. The sintered B6O–B4C compacts exhibit hardness values comparable to commercially available polycrystalline BN and are used for the high-speed cutting of hardened steel.

    30. Filled and Hollow Carbon Nanofibers by Coaxial Electrospinning of Alcell Lignin without Binder Polymers (pages 4292–4296)

      M. Lallave, J. Bedia, R. Ruiz-Rosas, J. Rodríguez-Mirasol, T. Cordero, J. C. Otero, M. Marquez, A. Barrero and I. G. Loscertales

      Version of Record online: 29 NOV 2007 | DOI: 10.1002/adma.200700963

      Thumbnail image of graphical abstract

      This work reports the formation of both solid and hollow lignin micro- and nanofibers, at room temperature and without polymer binders, by co-electrospinning. These fibers, after thermal stabilization, are carbonized to produce hollow and solid carbon nanofibers (see figure) with specific surface areas similar to values found for active carbon.

    31. Hole–Mask Colloidal Lithography (pages 4297–4302)

      H. Fredriksson, Y. Alaverdyan, A. Dmitriev, C. Langhammer, D. S. Sutherland, M. Zäch and B. Kasemo

      Version of Record online: 29 NOV 2007 | DOI: 10.1002/adma.200700680

      Thumbnail image of graphical abstract

      Hole-mask colloidal lithography (HCL) represents a truly versatile and simple bottom-up nanofabrication method based on colloidal self-assembly lithographic patterning. The HCL technique provides an effective means of patterning vast surface areas with diverse functional nanoarchitectures. Examples include arrays of nanodiscs, oriented elliptical nanostructures, (binary) nanodisc pairs, nanocones on extended surfaces and nanodiscs embedded in a surrounding matrix.

  7. Index

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Progress Reports
    6. Review
    7. Communications
    8. Index

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