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Cover image for Vol. 9 Issue 7

April 8, 2013

Volume 9, Issue 7

Pages 961–1115

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Corrigendum
    8. Correspondence
    9. Frontispiece
    10. Communications
    11. Full Papers
    1. Microfluidics: High Yield, Reproducible and Quasi-Automated Bilayer Formation in a Microfluidic Format (Small 7/2013) (page 961)

      Verena C. Stimberg, Johan G. Bomer, Iris van Uitert, Albert van den Berg and Séverine Le Gac

      Article first published online: 2 APR 2013 | DOI: 10.1002/smll.201370037

      Thumbnail image of graphical abstract

      A sophisticated planar model of a cell membrane is designed by S. Le Gac and co-workers, comprising various types of phospholipids and including membrane proteins as, for instance, ion channels. Such membrane models are prepared in the microfluidic platform reported on page 1076 in a quasi-automated manner with a near-100% yield, and are characterized in situ using both electrical and optical techniques. The versatility of the platform is illustrated, with application in experimentation on membranes prepared from various lipid species, electrical measurements on individual nanopores, and early drug screening assays using gramicidin peptides.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Corrigendum
    8. Correspondence
    9. Frontispiece
    10. Communications
    11. Full Papers
    1. Organic Nanocrystals: Atomically Flat, Large-Sized, Two-Dimensional Organic Nanocrystals (Small 7/2013) (page 962)

      Hui Jiang, Keke K. Zhang, Jun Ye, Fengxia Wei, Peng Hu, Jun Guo, Chunyong Liang, Xiaodong Chen, Yang Zhao, L. E. McNeil, Wenping Hu and Christian Kloc

      Article first published online: 2 APR 2013 | DOI: 10.1002/smll.201370038

      Thumbnail image of graphical abstract

      The charge-carrier transport process of perylene is simulated in a single crystal field-effect transistor on the molecular scale by H. Jiang, Y. Zhao, W. Hu, C. Kloc and co-workers. Charge carriers can be transported in different directions, resulting in anisotropy. Atomically-flat, large-sized, 2D organic nanocrystals can be obtained. Based on this ideal structure, 3D models of molecular packing of perylene are made to show possible charge-carrier transport directions. Both experiments and theoretical calculations on page 990 show that the preferred route of intermolecular transport is along the [001] direction, highlighted in the image with a beam of white light.

  3. Back Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Corrigendum
    8. Correspondence
    9. Frontispiece
    10. Communications
    11. Full Papers
    1. Hierarchical Structures: Novel Three-Dimensional Nanoporous Alumina as a Template for Hierarchical TiO2 Nanotube Arrays (Small 7/2013) (page 1120)

      Daoai Wang, Lianbing Zhang, Woo Lee, Mato Knez and Lifeng Liu

      Article first published online: 2 APR 2013 | DOI: 10.1002/smll.201370039

      Thumbnail image of graphical abstract

      Hierarchical titania nanotube arrays are replicated from an anodic aluminium oxide membrane with three-dimensionally distributed nanopore structures by D. Wang, L. Liu, and co-workers using atomic layer deposition. On page 1025, anodization in phosphoric acid is accomplished under very harsh conditions using rough, chemically etched, microstructured aluminium foils. The microstructured aluminium provides a unique platform to explore the 3D evolution of oxide nanopores during anodization. More importantly, the resulting 3D nanoporous alumina can act as a general template to fabricate a wide range of hierarchical micro-/nanostructures that cannot be easily realized by conventional physical and chemical means.

  4. Masthead

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Corrigendum
    8. Correspondence
    9. Frontispiece
    10. Communications
    11. Full Papers
    1. Masthead: (Small 7/2013)

      Article first published online: 2 APR 2013 | DOI: 10.1002/smll.201370040

  5. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Corrigendum
    8. Correspondence
    9. Frontispiece
    10. Communications
    11. Full Papers
    1. Contents: (Small 7/2013) (pages 963–969)

      Article first published online: 2 APR 2013 | DOI: 10.1002/smll.201370041

  6. Corrigendum

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Corrigendum
    8. Correspondence
    9. Frontispiece
    10. Communications
    11. Full Papers
    1. You have free access to this content
      Corrigendum: Microfluidics for Manipulating Cells (page 969)

      Xuan Mu, Wenfu Zheng, Jiashu Sun, Wei Zhang and Xingyu Jiang

      Article first published online: 2 APR 2013 | DOI: 10.1002/smll.201300501

      This article corrects:

      Microfluidics for Manipulating Cells

      Vol. 9, Issue 1, 9–21, Article first published online: 30 AUG 2012

  7. Correspondence

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Corrigendum
    8. Correspondence
    9. Frontispiece
    10. Communications
    11. Full Papers
    1. Intracellular Uptake and Toxicity of Ag and CuO Nanoparticles: A Comparison Between Nanoparticles and their Corresponding Metal Ions (pages 970–982)

      Pontus Cronholm, Hanna L. Karlsson, Jonas Hedberg, Troy A. Lowe, Lina Winnberg, Karine Elihn, Inger Odnevall Wallinder and Lennart Möller

      Article first published online: 7 JAN 2013 | DOI: 10.1002/smll.201201069

      Thumbnail image of graphical abstract

      This study investigates the role of a Trojan horse-type mechanism for the toxicity of Ag-nano and CuO-nano particles, i.e., the importance of the solid particle to mediate cellular uptake and subsequent release of toxic species inside the cell. The results confirm a high uptake of CuO-nano and Ag-nano particles compared to their corresponding ions. CuO-nano induced toxicity, whereas no toxicity was observed for Ag-nano, most likely due to low intracellular release of silver ions.

  8. Frontispiece

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Corrigendum
    8. Correspondence
    9. Frontispiece
    10. Communications
    11. Full Papers
    1. SiCN: SiCN Nanofibers with a Diameter Below 100 nm Synthesized via Concerted Block Copolymer Formation, Microphase Separation, and Crosslinking (Small 7/2013) (page 983)

      Saravana K. T. Pillai, Winfried P. Kretschmer, Christine Denner, Günter Motz, Markus Hund, Andreas Fery, Martin Trebbin, Stefan Förster and Rhett Kempe

      Article first published online: 2 APR 2013 | DOI: 10.1002/smll.201370042

      Thumbnail image of graphical abstract

      SiCN fibers with a mean diameter of 50 nm and an aspect ratio of up to 100 are produced in a two-step process by R. Kempe and co-workers. The key step to fabricate the longitudinal and crosssectional views of the mesofibers shown here is a concerted block-copolymer synthesis, microphase separation, and cross linking at 140 °C followed by pyrolysis at 1100 °C. Inexpensive components like a commercially available silazane and polyethylene are linked. The fibers may find application in electronic devices, as components of ceramic matrix composites, as fiber beds in hightemperature nano-filtering like diesel fine dust removal, or as thermally robust and chemically inert catalyst supports. Furthermore, the SiCN nanofibers introduced on page 984 are a promising alternative to ultrathin carbon fibers, due to their oxidation resistance.

  9. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Corrigendum
    8. Correspondence
    9. Frontispiece
    10. Communications
    11. Full Papers
    1. SiCN Nanofibers with a Diameter Below 100 nm Synthesized via Concerted Block Copolymer Formation, Microphase Separation, and Crosslinking (pages 984–989)

      Saravana K. T. Pillai, Winfried P. Kretschmer, Christine Denner, Günter Motz, Markus Hund, Andreas Fery, Martin Trebbin, Stefan Förster and Rhett Kempe

      Article first published online: 19 NOV 2012 | DOI: 10.1002/smll.201202121

      Thumbnail image of graphical abstract

      Ultrathin SiCN fibers are produced from inexpensive carbosilazane-polyethylene block copolymers. The two-step synthesis consists of a concerted block copolymer formation, microphase separation and crosslinking step, followed by pyrolysis. The fibers have a mean diameter of 45 nm and an aspect ratio of up to 100.

    2. Atomically Flat, Large-Sized, Two-Dimensional Organic Nanocrystals (pages 990–995)

      Hui Jiang, Keke K. Zhang, Jun Ye, Fengxia Wei, Peng Hu, Jun Guo, Chunyong Liang, Xiaodong Chen, Yang Zhao, L. E. McNeil, Wenping Hu and Christian Kloc

      Article first published online: 22 NOV 2012 | DOI: 10.1002/smll.201202390

      Thumbnail image of graphical abstract

      Large-sized, 2D single crystals of perylene are grown by both solution-cast and physical vapor transport methods. The crystals have a atomically flat parallelogram morphology and the aspect ratios of the lateral extension compared to the thickness are up to 103. The atomically flat feature leads to good interface contact, making a single-crystal field-effect transistor with higher mobility. The mobility of atomically flat crystals can be 103–104 times higher than rough crystals.

    3. Three-Dimensional CdS–Titanate Composite Nanomaterials for Enhanced Visible-Light-Driven Hydrogen Evolution (pages 996–1002)

      Yanyan Zhang, Yuxin Tang, Xinfeng Liu, Zhili Dong, Huey Hoon Hng, Zhong Chen, Tze Chien Sum and Xiaodong Chen

      Article first published online: 13 DEC 2012 | DOI: 10.1002/smll.201202156

      Thumbnail image of graphical abstract

      3D Hierarchical echinus-like titanate spheres (HETSs), serving as the supporting material for CdS nanoparticles, are synthesized via a fast one-step hydrothermal method. The obtained 3D CdS–HETS composite materials show enhanced H2 generation under visible light irradiation.

    4. Loading Metal Nanostructures on Cotton Fabrics as Recyclable Catalysts (pages 1003–1007)

      Baocheng Yang, Chunmei Zhao, Manda Xiao, Feng Wang, Chuanhao Li, Jianfang Wang and Jimmy C. Yu

      Article first published online: 13 DEC 2012 | DOI: 10.1002/smll.201202023

      Thumbnail image of graphical abstract

      Noble metal nanostructures of varying compositions and shapes are loaded on cotton fabrics. The fabric-supported metal nanostructures can function as effective catalysts for different liquid-phase catalytic reactions. They exhibit superior recyclability, with the catalytic activities remaining nearly unchanged even after ten cycles of catalytic reactions for all of the three tested reactions.

    5. Replication of Bone Marrow Differentiation Niche: Comparative Evaluation of Different Three-Dimensional Matrices (pages 1008–1015)

      Meghan J. Cuddihy, Yichun Wang, Charles Machi, Joong Hwan Bahng and Nicholas A. Kotov

      Article first published online: 21 DEC 2012 | DOI: 10.1002/smll.201202133

      Thumbnail image of graphical abstract

      The comparative evaluation of different 3D matrices—Matrigel, Puramatrix, and inverted colloidal crystal (ICC) scaffolds—provides a perspective for studying the pathology and potential cures for many blood and bone marrow diseases, and further proves the significance of 3D cultures with direct cell–cell contacts for in vitro mimicry of the human stem cell niche.

    6. Programmed Colorimetric Logic Devices Based on DNA–Gold Nanoparticle Interactions (pages 1016–1020)

      Qiao Jiang, Zhen-Gang Wang and Baoquan Ding

      Article first published online: 4 JAN 2013 | DOI: 10.1002/smll.201201760

      Thumbnail image of graphical abstract

      A system including nucleic acid strands and unmodified gold nanopartcles is activated to perform programmed logic functions, using pH and DNA as inputs and the plasmonic-related color change of gold nanoparticles as the output. The complexity of the logic devices can be simply enhanced by appropriate engineering.

    7. Responsive Helical Self-Assembly of AgNO3 and Melamine Through Asymmetric Coordination for Ag Nanochain Synthesis (pages 1021–1024)

      Jinbo Fei, Liang Gao, Jie Zhao, Cuiling Du and Junbai Li

      Article first published online: 13 NOV 2012 | DOI: 10.1002/smll.201202299

      Thumbnail image of graphical abstract

      Responsive nanohelices can be self-assembled via asymmetric coordination bonding between AgNO3 and melamine. Silver nanochains composed of nanoparticles can be synthesized simply by photo-reduction of the above complex.

    8. Novel Three-Dimensional Nanoporous Alumina as a Template for Hierarchical TiO2 Nanotube Arrays (pages 1025–1029)

      Daoai Wang, Lianbing Zhang, Woo Lee, Mato Knez and Lifeng Liu

      Article first published online: 3 DEC 2012 | DOI: 10.1002/smll.201201784

      Thumbnail image of graphical abstract

      Hierarchical micro-/nano-structures made easy. By using extremely rough, chemically etched microstructured aluminium foils, anodization in phosphoric acid under very harsh conditions, e.g., 10 wt% phosphoric acid and room temperature, can be repeatedly accomplished without suffering from breakdown. As a result, an alumina membrane with a three-dimensionally distributed nanopore structure is formed, which can be used as a general template to fabricate hierarchical micro-/nano-structures.

    9. Oxidation Level-Dependent Zwitterionic Liposome Adsorption and Rupture by Graphene-based Materials and Light-Induced Content Release (pages 1030–1035)

      Alexander C.-F. Ip, Biwu Liu, Po-Jung Jimmy Huang and Juewen Liu

      Article first published online: 13 DEC 2012 | DOI: 10.1002/smll.201202710

      Thumbnail image of graphical abstract

      Liposomes may be stably adsorbed or ruptured on graphene-based materials, depending on the oxidation state of graphene. IR-induced liposome leakage is achieved, since graphene oxide does not induce liposome leakage spontaneously.

    10. Controlled Synthesis of Double-Wall a-FePO4 Nanotubes and their LIB Cathode Properties (pages 1036–1041)

      Ren Cai, Hai Liu, Wenyu Zhang, Huiteng Tan, Dan Yang, Yizhong Huang, Huey Hoon Hng, Tuti Mariana Lim and Qingyu Yan

      Article first published online: 13 DEC 2012 | DOI: 10.1002/smll.201202291

      Thumbnail image of graphical abstract

      Double-wall amorphous FePO4 nanotubes are prepared by an oil-phase chemical route. The inward diffusion of vacancies and outward diffusion of ions through passivation layers result in double-wall nanotubes with thin walls. Such a process can be extended to prepare hollow polydedral nanocrystals and hollow ellipsoids. The double-wall FePO4 nanotubes show interesting cathode performance in Li ion batteries.

    11. Ultra-Rapid Growth of Biphasic Nanowires in Micro- and Hypergravity (pages 1042–1046)

      Michael Veith, Juseok Lee, Herbert Schmid and Cenk Aktas

      Article first published online: 13 DEC 2012 | DOI: 10.1002/smll.201201833

      Thumbnail image of graphical abstract

      Aluminium/aluminium oxide wires form under microgravity, earth conditions, and hypergravity in different forms. While under 0.04 G the biphasic wires are predominantly linear, they form bundles of wires of high curvature at 1 G and 1.8 G. The absence (0.04 G) and presence (1 G, 1.8 G) of gradients are reflected by the agglomeration and growth direction of the nanowires.

    12. Mesoporous Metallic Cells: Design of Uniformly Sized Hollow Mesoporous Pt–Ru Particles with Tunable Shell Thicknesses (pages 1047–1051)

      Hamed Ataee-Esfahani, Jian Liu, Ming Hu, Nobuyoshi Miyamoto, Satoshi Tominaka, Kevin C. W. Wu and Yusuke Yamauchi

      Article first published online: 27 DEC 2012 | DOI: 10.1002/smll.201202539

      Thumbnail image of graphical abstract

      A new class of hollow mesoporous Pt–Ru and Pt particles with uniform size, named ‘mesoporous metallic cells’, are synthesized through a dual-templating approach using colloidal silica particles and non-ionic surfactants. To realize the full potential of mesoporous metals as electrocatalysts, the shell thicknesses, compositions, and hollow cavity sizes are precisely controlled.

    13. Multicolor Hybrid Upconversion Nanoparticles and Their Improved Performance as Luminescence Temperature Sensors Due to Energy Transfer (pages 1052–1057)

      Rui Chen, Van Duong Ta, Fen Xiao, Qinyuan Zhang and Handong Sun

      Article first published online: 4 JAN 2013 | DOI: 10.1002/smll.201202287

      Thumbnail image of graphical abstract

      By combining upconversion nanoparticles (UCNPs) with rhodamine 6G (R6G) dye molecules, multicolor emission based on energy transfer is achieved. The complexes can be dissolved in epoxy resin, and self-assembled hemispherical microstructures are fabricated through a hydrophobic effect. A luminescence temperature sensor takes advantage of the high temperature sensitivity of the complexes due to energy transfer.

  10. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Corrigendum
    8. Correspondence
    9. Frontispiece
    10. Communications
    11. Full Papers
    1. Ultra-High Optical Absorption Efficiency from the Ultraviolet to the Infrared Using Multi-Walled Carbon Nanotube Ensembles (pages 1058–1065)

      Anupama B. Kaul, James B. Coles, Michael Eastwood, Robert O. Green and Prabhakar R. Bandaru

      Article first published online: 11 DEC 2012 | DOI: 10.1002/smll.201202232

      Thumbnail image of graphical abstract

      Plasma-synthesized, ultra-thin,vertically oriented carbon nanotube ensembles on metals exhibit 100X superior optical absorption properties compared to the reference over a broad spectral range into the IR. The nanoabsorbers are remarkably rugged and do not degrade at temperatures as high as 400 °C, and are attractive for anti-reflection coatings, sensors, and energy-harvesting devices.

    2. Highly Conductive Carbon Nanotube Matrix Accelerates Developmental Chloride Extrusion in Central Nervous System Neurons by Increased Expression of Chloride Transporter KCC2 (pages 1066–1075)

      Wolfgang Liedtke, Michele Yeo, Hongbo Zhang, Yiding Wang, Michelle Gignac, Sara Miller, Ken Berglund and Jie Liu

      Article first published online: 10 DEC 2012 | DOI: 10.1002/smll.201201994

      Thumbnail image of graphical abstract

      Few-walled carbon nanotubes (fwCNTs) with very high electrical conductivity, when used as culture matrix for primary nerve cells from the central nervous system, force the neurons to lower their chloride faster. Mechanistic insights are provided into how fwCNTs exert their powerful impact on nerve cells’ chloride homeostasis, which underlies inhibitory transmission in the central nervous system.

    3. High Yield, Reproducible and Quasi-Automated Bilayer Formation in a Microfluidic Format (pages 1076–1085)

      Verena C. Stimberg, Johan G. Bomer, Iris van Uitert, Albert van den Berg and Séverine Le Gac

      Article first published online: 9 NOV 2012 | DOI: 10.1002/smll.201201821

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      A microfluidic platform is presented for experimentation on planar cell membrane models and membrane proteins, using a combination of electrical and optical techniques. The applicability of the device is demonstrated for in-depth studies on membrane properties; confocal imaging of phase separation in ternary membrane systems; single protein measurements; and indirect assessment of membrane property alterations using the sensitivity of gramicidin to its environment.

    4. Modulation of Lumen Formation by Microgeometrical Bioactive Cues and Migration Mode of Actin Machinery (pages 1086–1095)

      Yifeng Lei, Omar F. Zouani, Lila Rami, Christel Chanseau and Marie-Christine Durrieu

      Article first published online: 15 NOV 2012 | DOI: 10.1002/smll.201202410

      Thumbnail image of graphical abstract

      Peptide micropatterning on polymer surfaces are designed to control endothelial cell (EC) functions. ECs form tubular structures with a central lumen depending on both microgeometrical cues of peptide micropatterns and different migration modes of actin machinery on the peptide micropatterns.

    5. Single Quantum Dot Analysis Enables Multiplexed Point Mutation Detection by Gap Ligase Chain Reaction (pages 1096–1105)

      Yunke Song, Yi Zhang and Tza-Huei Wang

      Article first published online: 13 DEC 2012 | DOI: 10.1002/smll.201202242

      Thumbnail image of graphical abstract

      A novel quantum dot (QD) nano-assay is designed for multiplexed mutation detection. The ligation assay generates DNA–QD nanocomplexes emitting fluorescence of various color combinations as an indication of the specific genotype of the analyzed sample. The assay enables multiplexed mutation detection in a sensitive and specific manner without a need for separation procedures.

    6. Correct Spectral Conversion between Surface-Enhanced Raman and Plasmon Resonance Scattering from Nanoparticle Dimers for Single-Molecule Detection (pages 1106–1115)

      Kyuwan Lee and Joseph Irudayaraj

      Article first published online: 27 DEC 2012 | DOI: 10.1002/smll.201201985

      Thumbnail image of graphical abstract

      A surface-enhanced Raman scattering (SERS) nanoruler concept for measuring interparticle distance is proposed, based on the one-to-one correspondence with localized. surface plasmon resonance. DNA-functionalized gold nanoparticles are used to construct dimers with head–head and tail–tail configurations to examine the SERS shaping effect for different interparticle distances. This concept is applicable to detection, quantification, and distance measurement.

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