Advanced Materials Interfaces

Cover image for Vol. 1 Issue 2

April, 2014

Volume 1, Issue 2

  1. Cover Picture

    1. Top of page
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    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Frontispiece
    8. Communications
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    10. Full Papers
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      Silicon Nanocrystals: Direct Bandgap Silicon: Tensile-Strained Silicon Nanocrystals (Adv. Mater. Interfaces 2/2014)

      Kateřina Kůsová, Prokop Hapala, Jan Valenta, Pavel Jelínek, Ondřej Cibulka, Lukáš Ondič and Ivan Pelant

      Article first published online: 15 APR 2014 | DOI: 10.1002/admi.201470008

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      Methyl-passivated silicon nanocrystals, such as the one in the foreground of the cover image, are capable of fast and efficient luminescence although their bulk counterpart is an indirect semiconductor. K. Kû sová and co-workers show in article 1300042 that appropriately chosen surface capping tensilestrains the crystalline core and thus transforms this form of silicon into a material with a fundamental direct bandgap.

  2. Inside Front Cover

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    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Frontispiece
    8. Communications
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      Surface Patterning: Digital Liquid Patterning: A Versatile Method for Maskless Generation of Liquid Patterns and Gradients (Adv. Mater. Interfaces 2/2014)

      Alexander N. Efremov, Michael Grunze and Pavel A. Levkin

      Article first published online: 15 APR 2014 | DOI: 10.1002/admi.201470009

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      The inside cover image is a 2D pattern of water surface-tension-confined channels formed on an array of hydrophilic spots (“digits”) surrounded by hydrophobic barriers. This method, called digital liquid patterning (DLP), allows for the formation of liquid patterns of arbitrary and easily variable geometries without the need for the fabrication of new photomasks for every pattern with a different geometry. Further details can be found in article 1300075 by P. A. Levkin and co-workers.

  3. Back Cover

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      Complex Nanomaterials: Laser-Directed Self-Organization and Reaction Control in Complex Systems: A Facile Synthesis Route for Functional Materials (Adv. Mater. Interfaces 2/2014)

      Hendrik Reinhardt, Clemens Pietzonka, Bernd Harbrecht and Norbert Hampp

      Article first published online: 15 APR 2014 | DOI: 10.1002/admi.201470014

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      The back cover displays a colored electron microscopy image of vertically aligned nanorod arrays consisting of graded transition metal oxides. Nanomaterials of such complexity are considerably difficult to create using standard processes. As N. Hampp and co-workers report in article 1300060, directed self-organization in multicomponent precursors appears to be a powerful concept for this upcoming challenge in nanoscience.

  4. Masthead

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      Masthead: (Adv. Mater. Interfaces 2/2014)

      Article first published online: 15 APR 2014 | DOI: 10.1002/admi.201470013

  5. Contents

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    3. Inside Front Cover
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      Contents: (Adv. Mater. Interfaces 2/2014)

      Article first published online: 15 APR 2014 | DOI: 10.1002/admi.201470010

  6. Frontispiece

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      Biotemplates: Scalable Nanomanufacturing of Virus-templated Coatings for Enhanced Boiling (Adv. Mater. Interfaces 2/2014)

      Md Mahamudur Rahman, Emre Ölçeroğlu and Matthew McCarthy

      Article first published online: 15 APR 2014 | DOI: 10.1002/admi.201470011

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      Phase-change heat transfer is used in a variety of large-scale applications and plays a critical role in the production and consumption of energy. As such, there is a need to develop scalable manufacturing strategies for the implementation of robust nanostructured coatings to enhance these processes through interfacial engineering. In article 1300107, M. McCarthy and co-workers demonstrate the use of biological templates for the scalable nanomanufacturing of virusstructured coatings showing enhanced pool boiling performance.

  7. Communications

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    1. Scalable Nanomanufacturing of Virus-templated Coatings for Enhanced Boiling

      Md Mahamudur Rahman, Emre Ölçeroğlu and Matthew McCarthy

      Article first published online: 11 FEB 2014 | DOI: 10.1002/admi.201300107

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      Biotemplated nanostructures for enhanced boiling are demonstrated using the scalable nanomanufacturing of high-surface-area virus-structured coatings on copper, aluminum, stainless steel, and silicon surfaces. Superhydrophilic coatings based on self-assembly of the Tobacco mosaic virus are cheap and scalable to real-world applications, and are shown here to enhance critical heat flux and heat transfer coefficient by up to 200%.

    2. Synthesis and Characterization of Layered Tin Monoxide Thin Films with Monocrystalline Structure on III–V Compound Semiconductor

      Pekka Laukkanen, Jouko Lång, Marko Punkkinen, Mikhail Kuzmin, Marjukka Tuominen, Muhammad Yasir, Johnny Dahl, Veikko Tuominen, Kalevi Kokko, Ville Polojärvi, Joel Salmi, Ville-Markus Korpijärvi, Arto Aho, Antti Tukiainen, Mircea Guina, Hannu-Pekka Hedman and Risto Punkkinen

      Article first published online: 27 DEC 2013 | DOI: 10.1002/admi.201300022

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      Synthesis of layered SnO with a monocrystalline structure on a semiconductor substrate is demonstrated using a vacuum deposition method as well as diffraction, microscopy, and spectroscopy characterization.

    3. Digital Liquid Patterning: A Versatile Method for Maskless Generation of Liquid Patterns and Gradients

      Alexander N. Efremov, Michael Grunze and Pavel A. Levkin

      Article first published online: 5 FEB 2014 | DOI: 10.1002/admi.201300075

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      A facile, maskless, digital liquid patterning method, allowing on-demand fabrication of liquid patterns without the need to change the substrate or use different photomasks, is described. Patterns with customized geometries can be created manually by simple pipetting. An application of this maskless method to create patterns of particles, cells, hydrogels, and complex liquid gradients compatible with cell studies is shown.

    4. Lattice-Contraction-Induced Moiré Patterns in Direction-Controlled Epitaxial Graphene on Cu(111)

      Hyunseob Lim, Jaehoon Jung, Hyun Jin Yang and Yousoo Kim

      Article first published online: 13 JAN 2014 | DOI: 10.1002/admi.201300080

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      Contrary to the general understanding, direction controlled epitaxial graphenes with an identical rotational angle (R θ = R0ˆ) is reported. Despite the identical Rθ, various Moire patterns with different periodicity are observed, which cannot be understood by conventional Rθ dependence. A new method is suggested for practical analysis, in which degree of lattice contraction of EG results in the various Moire superstructures.

    5. Laser-Directed Self-Organization and Reaction Control in Complex Systems: A Facile Synthesis Route for Functional Materials

      Hendrik Reinhardt, Clemens Pietzonka, Bernd Harbrecht and Norbert Hampp

      Article first published online: 23 JAN 2014 | DOI: 10.1002/admi.201300060

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      Self-organization in complex systems is introduced as a versatile concept for the fabrication of functional materials. The bottom-up process is based on laser-stimulated pattern formation and reaction control in multicomponent precursor materials. Mechanistic investigations demonstrate the potential of lasers to direct self-organization into selective channels, thus facilitating the synthesis of functional materials by design.

    6. Flexible Porous Bismuth Telluride Thin Films with Enhanced Figure of Merit using Micro-Phase Separation of Block Copolymer

      Kunihisa Kato, Yoshika Hatasako, Michitaka Uchino, Yasukazu Nakata, Yoshinori Suzuki, Teruaki Hayakawa, Chihaya Adachi and Koji Miyazaki

      Article first published online: 8 FEB 2014 | DOI: 10.1002/admi.201300015

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      Flexible porous bismuth telluride thin films are prepared using micro-phase separated block-copolymer porous films. The thermal conductivities of the thus-fabricated porous p-type (Bi0.4Te3.0Sb1.6) and n-type (Bi2.0Te2.7Se0.3) thin films are extremely lower than those of their bulk counterparts owing to strong phonon scattering. The figure of merit ZT of porous p-, n- bismuth telluride thin films is estimated to be 1.34 and 1.47.

    7. A Single-Walled Carbon Nanotube Coated Flexible PVC Counter Electrode for Dye-Sensitized Solar Cells

      Syed Ghufran Hashmi, Janne Halme, Ying Ma, Tapio Saukkonen and Peter Lund

      Article first published online: 23 DEC 2013 | DOI: 10.1002/admi.201300055

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      A single-walled carbon nanotube coated PVC substrate is fabricated with a low temperature ink. This substrate exhibits remarkable mechanical durability, impressive charge transfer resistance (2.7 Ω cm2) and similar photovoltaic performance compared to the traditional thermally platinized counter electrodes based dye sensitized solar cell when tested as nonmetallic catalyst loaded metal-free counter electrode.

    8. Inscribing Wettability Gradients Onto Superhydrophobic Carbon Nanotube Surfaces

      Deepu J. Babu, Subramanyan Namboodiri Varanakkottu, Alexander Eifert, Dirk de Koning, Gennady Cherkashinin, Steffen Hardt and Jörg J. Schneider

      Article first published online: 27 JAN 2014 | DOI: 10.1002/admi.201300049

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      Tunable wettability of carbon nanotube (CNT) arrays on the nanoscale is the key to move water droplets on such surfaces on a macroscopic scale. A novel type of superhydrophobic CNT surface for guided droplet transport, a key issue for future microfluidic systems, is demonstrated. It is accomplished by tailoring the required surface roughness using a process employing CNT regrowth, chemical passivation, and corona discharge.

  8. Frontispiece

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Frontispiece
    8. Communications
    9. Frontispiece
    10. Full Papers
    1. You have free access to this content
      Organic Electronics: Structural Modifications in Bilayered Molecular Systems Lead to Predictable Changes in Their Electronic Properties (Adv. Mater. Interfaces 2/2014)

      Carleen M. Bowers, Minlu Zhang, Yekaterina Lyubarskaya, Eric J. Toone, Ching Tang and Alexander A. Shestopalov

      Article first published online: 15 APR 2014 | DOI: 10.1002/admi.201470012

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      A. A. Shestopalov and co-workers demonstrate in article 1300109 the influence of functional group substitution on the molecular resistance in ordered and functional self-assembled monolayers on indium tin oxide. By independently controlling the geometry and chemistry of the monolayers, the charge transfer through the monolayers can be controlled with the electron-withdrawing or donating functional groups, and the differences in the charge transfer dynamics can be visualized via patterned electroluminescence using traditional organic light emitting diodes.

  9. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Frontispiece
    8. Communications
    9. Frontispiece
    10. Full Papers
    1. Structural Modifications in Bilayered Molecular Systems Lead to Predictable Changes in Their Electronic Properties

      Carleen M. Bowers, Minlu Zhang, Yekaterina Lyubarskaya, Eric J. Toone, Ching Tang and Alexander A. Shestopalov

      Article first published online: 6 FEB 2014 | DOI: 10.1002/admi.201300109

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      The influence of functional group substitution on molecular resistance is demonstrated by comparing bilayered monomolecular systems on indium tin oxide. By independently controlling the geometry and chemistry of bilayers, it is shown that the charge transfer through the bilayered system can be controlled with electron-withdrawing or donating functional groups, and that the differences in the charge transfer dynamics can be visualized via patterned electroluminescence.

    2. Polymer Brush Gradients by Adjusting the Functional Density Through Temperature Gradient

      Bat-El Pinchasik, Klaus Tauer, Helmuth Möhwald and Andre G. Skirtach

      Article first published online: 7 MAR 2014 | DOI: 10.1002/admi.201300056

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      A polymer brush gradient is synthesized by spin casting a silane terminated initiator on silicon. A temperature gradient profile is then applied to form an initiator concentration gradient template, yielding a wettability gradient. Polyacrylamide brushes are polymerized from this template. Simulations extend the possible temperature profiles for other possible initiator templates.

    3. Direct Bandgap Silicon: Tensile-Strained Silicon Nanocrystals

      Kateřina Kůsová, Prokop Hapala, Jan Valenta, Pavel Jelínek, Ondřej Cibulka, Lukáš Ondič and Ivan Pelant

      Article first published online: 19 DEC 2013 | DOI: 10.1002/admi.201300042

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      Silicon nanocrystals can be transformed into an efficient light-emitting direct-bandgap material, even though they are based on poorly-emitting indirect-bandgap bulk silicon. This transformation can be achieved owing to the effect of naturally straining surface capping, acting in cooperation with quantum confinement on the band-structure of the nanocrystal. These results open up new possibilities in efficiently emitting non-toxic quantum dots.

    4. Nanoparticles Interacting with Proteins and Cells: A Systematic Study of Protein Surface Charge Effects

      Li Shang, Linxiao Yang, Jürgen Seiter, Marita Heinle, Gerald Brenner-Weiss, Dagmar Gerthsen and G. Ulrich Nienhaus

      Article first published online: 21 DEC 2013 | DOI: 10.1002/admi.201300079

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      Through chemical modification of the model protein human serum albumin (HSA), the surface charge of proteins adsorbing onto nanoparticles is systematically varied to examine the effect of Coulomb forces in modulating nanoscale biological interactions. These results exemplify vividly that, for the same nanoparticles, very different biological responses may result, depending on the nature of the protein(s) adsorbed onto its surface.

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      Modulation of Biointeractions by Electrically Switchable Oligopeptide Surfaces: Structural Requirements and Mechanism

      Chun L. Yeung, Xingyong Wang, Minhaj Lashkor, Eleonora Cantini, Frankie J. Rawson, Parvez Iqbal, Jon A. Preece, Jing Ma and Paula M. Mendes

      Article first published online: 25 JAN 2014 | DOI: 10.1002/admi.201300085

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      The switching mechanism on electrically switchable oligopeptide surfaces is based on conformational changes between collapsed (“OFF” state) and fully extended (“ON” state) oligopeptide structures. In the “ON” state, the ligand appended to the oligopeptide is largely free from steric factors allowing for protein binding. While in “OFF” state, the ligand presented at the surface is partially embedded in the second component of the mixed self-assembled monolayer, and thus sterically shielded and inaccessible for protein binding.

    6. Nanoscale Adhesive Properties of Graphene: The Effect of Sliding History

      Xin-Z. Liu, Qunyang Li, Philip Egberts and Robert W. Carpick

      Article first published online: 22 JAN 2014 | DOI: 10.1002/admi.201300053

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      Adhesion properties between a nanoscale single asperity and graphene are studied using atomic force microscopy (AFM). Adhesion measurements show that aging of graphene enhances the adhesive interaction between the AFM tip and graphene. Upon tip sliding, puckering occurs to a degree that depends on the number of layers of graphene present. However, regardless of the number of layers, top-layer delamination occurs during retraction of the tip, leading to enhanced adhesion. This enhancement vanishes in subsequent adhesion measurements performed without prior sliding.

    7. Long Jumps of an Organic Molecule Induced by Atomic Force Microscopy Manipulation

      Gernot Langewisch, Jens Falter, André Schirmeisen and Harald Fuchs

      Article first published online: 21 DEC 2013 | DOI: 10.1002/admi.201300013

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      Single PTCDA molecules are laterally manipulated along the Ag(111) surface with an AFM tip. Besides nearest neighbor jumps, also discrete long jumps spanning several lattice spacings of the substrate are induced. During the manipulation, the 2D force field and the energy dissipation are recorded providing detailed information about the manipulation process.

    8. Heat Induced Passivation of CuInSe2 Surfaces: A Strategy to Optimize the Efficiency of Chalcopyrite Thin Film Solar Cells?

      Harry Mönig, David Lockhorn, Nabi Aghdassi, Alexander Timmer, Christian A. Kaufmann, Raquel Caballero, Helmut Zacharias and Harald Fuchs

      Article first published online: 13 JAN 2014 | DOI: 10.1002/admi.201300040

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      A complete passivation of defect levels on chalcopyrite thin film surfaces is observed after removing surface oxides by KCN etching and subsequent UHV annealing. The passivation goes along with a significantly increased surface band bending. In contrast, oxidation of the surface by annealing in air reduces the surface band bending and creates a high density of charge compensated defects.

    9. Designing Lubricant-Impregnated Textured Surfaces to Resist Scale Formation

      Srinivas Bengaluru Subramanyam, Gisele Azimi and Kripa K. Varanasi

      Article first published online: 20 JAN 2014 | DOI: 10.1002/admi.201300068

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      A comparison between an untreated smooth surface and lubricant-impregnated surface (LIS) after gypsum scale deposition. LIS shows significantly lower scale deposition compared to an untreated smooth surface. This remarkable performance of LIS is due to the reduced nucleation rate on the surface owing to its low surface energy and low density of nucleation sites.

    10. Coating Engineering of MnFe2O4 Nanoparticles with Superhigh T2 Relaxivity and Efficient Cellular Uptake for Highly Sensitive Magnetic Resonance Imaging

      Xiao Li Liu, Yu Tong Wang, Cheng Teng Ng, Rong Wang, Guang Yin Jing, Jia Bao Yi, Jian Yang, Boon Huat Bay, Lin-Yue Lanry Yung, Dai Di Fan, Jun Ding and Hai Ming Fan

      Article first published online: 24 JAN 2014 | DOI: 10.1002/admi.201300069

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      A universal strategy based on manipulating coating layer of magnetic nanoparticle with both superhigh T2 relaxivity and efficient cellular uptake for ultrasensitive magnetic resonance imaging is developed. Modeling analysis indicates that the mPEG-g-PEI coating layer could induce the remarkably reduced diffusivity of trapped water molecules and positively surface charge, resulting in superhigh T2 relaxivity and efficient cellular uptake.

    11. Two-Dimensional Periodic Relief Gratings as a Versatile Platform for Label-Free Specific DNA Detection

      Jem-Kun Chen, Gang-Yan Zhou, Chi-Jung Chang, Ai-Wei Lee and Feng-Chih Chang

      Article first published online: 8 FEB 2014 | DOI: 10.1002/admi.201300074

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      Nanopillar arrays of silicon oxide are treated DNA probes as for the targeted single-stranded DNAs (ssDNAs). The DNA probes-modified nanopillar arrays undergoes dramatic changes in terms of their pillar scale upon hybridizing with target ssDNA, resulting in a color change from pure blue to red. Accordingly, these new films have potential applications as label-free optical biosensors with selectivity and sensitivity.

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