Particle & Particle Systems Characterization

Cover image for Vol. 34 Issue 8

Early View (Online Version of Record published before inclusion in an issue)

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  1. Full Papers

    1. Reduced Graphene Oxide decorated with Manganese Cobalt Oxide as Multifunctional Material for Mechanically Rechargeable and Hybrid Zinc–Air Batteries

      Adnan Qaseem, Fuyi Chen, Chuanzhou Qiu, Abdelaziz Mahmoudi, Xiaoqiang Wu, Xiaolu Wang and Roy L. Johnston

      Version of Record online: 30 JUN 2017 | DOI: 10.1002/ppsc.201700097

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      Carbon nanomaterial decorated with manganese cobalt oxide (MnCo2O4) displays excellent electrocatalytic and supercapacitive behavior. By combining the catalytic and pseudocapacitive characteristics of MnCo2O4, highly stable and efficient rechargeable Zn–air batteries are reported. The hybrid Zn–air batteries benefit from the synergistic behavior and work at higher voltage and deliver more power density on discharge with more efficiency compared to conventional Zn–air battery.

    2. High-Yield Synthesis of Au@Ag Right Bipyramids and Self-Assembly into Four-Leaf-Clover-like Structures

      Fei Ji, Qixuan Zhong, Jianmei Chen, Lei Chen, Huicheng Hu, Qipeng Liu, Peipei Yang, Jiaqi Yu, Lin Jiang, Yong Xu, Elad Gross and Qiao Zhang

      Version of Record online: 16 JUN 2017 | DOI: 10.1002/ppsc.201700114

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      A seed-mediated synthesis of Au@Ag right bipyramids with high yield (>95%) and controllable edge length (from ≈130 to ≈230 nm) is reported. For the first time, a four-leaf-clover-like tetramer of bipyramids is obtained through self-assembly. The tetramer shows a great performance in surface-enhanced Raman spectroscopy with an analytical enhancement factor up to 1.4 × 107.

  2. Communications

    1. Zinc Oxide–Porphyrin Hybrid Rhombuses: Catalytically Active Microstructures via Self-Assembly

      Jasmin Düring, Sarah Bernhardt and Franziska Gröhn

      Version of Record online: 29 MAY 2017 | DOI: 10.1002/ppsc.201600421

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      Organic–inorganic hybrid microrhombuses with enhanced photocatalytic performance can be built from two oppositely charged porphyrins and ZnO nanoparticles by self-assembly in solution. They exhibit a tunable shape and enhanced catalytic activity.

    2. Xenon Flash Lamp-Induced Ultrafast Multilayer Graphene Growth

      Tae Hong Im, Dae Yong Park, Hwan Keon Lee, Jung Hwan Park, Chang Kyu Jeong, Daniel J. Joe and Keon Jae Lee

      Version of Record online: 9 MAY 2017 | DOI: 10.1002/ppsc.201600429

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      A new ultrafastmultilayer graphene (MLG) synthesis method using flash light-induced photothermal effect is demonstrated. Only single irradiation of light with a pulse duration of 15 ms develops the MLG with I 2D/I G of ≈0.65 indicating about 15 layers of graphene. The flash lamp technique has potential for the mass production of graphene.

  3. Full Papers

    1. The Effects of Hydrogenation on Graphitic C3N4 Nanosheets for Enhanced Photocatalytic Activity

      Minjie Zhou, Zhaohui Hou and Xiaobo Chen

      Version of Record online: 2 MAY 2017 | DOI: 10.1002/ppsc.201700038

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      Hydrogenation dramatically changes the properties and enhances the photocatalytic performance of nonoxide catalyst, graphitic carbon nitride (g-C3N4) nanosheets.

  4. Reviews

    1. Discotic Liquid Crystals with Graphene: Supramolecular Self-assembly to Applications

      Manish Kumar, Ashwathanarayana Gowda and Sandeep Kumar

      Version of Record online: 31 MAR 2017 | DOI: 10.1002/ppsc.201700003

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      Graphene is the largest polycyclic aromatic compound as a discotic core with ameliorates liquid crystalline properties. Graphene oxide liquid crystals (GOLC) show promising impact on potential applications in optoelectronics, energy storage, sensors, and hybrid fibers.

  5. Full Papers

    1. Phase Transition and Liquid Crystalline Organization of Colloidal Graphene Oxide as a Function of pH

      Rachel Tkacz, Md Joynul Abedin, Phillip Sheath, Shalin B. Mehta, Amitabh Verma, Rudolf Oldenbourg and Mainak Majumder

      Version of Record online: 30 MAR 2017 | DOI: 10.1002/ppsc.201600391

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      Colloidal graphene oxide (GO) suspension reveals pH-dependent isotropic to nematic phase transition by broadening the biphasic region influenced by size fractionation of GO sheets. A highly organized GO nematic droplet of uniform size with isotropic interior forms in this region. This droplet shows reversible magnetic distortion under static magnetic field.

    2. Mechanical Properties of Poly(dopamine)-Coated Graphene Oxide and Poly(vinyl alcohol) Composite Fibers Coated with Reduced Graphene Oxide and Their Use for Piezoresistive Sensing

      Dongwoo Kang, Young-Eun Shin, Hye Jin Jo, Hyunhyub Ko and Hyeon Suk Shin

      Version of Record online: 30 MAR 2017 | DOI: 10.1002/ppsc.201600382

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      High-strength poly(vinyl alcohol) (PVA) composite fibers are successfully fabricated and reinforced by poly(dopamine)-coated graphene oxide (dGO) and exterior reduced graphene oxide (rGO) coating. The mechanical properties of PVA/dGO composite fibers show a dependence on the sheet size of GO and interfacial adhesion force formed by poly(dopamine) layers. Additionally, a piezoresistive sensing test of rGO-coated PVA/dGO fiber is shown.

    3. One-Pot Purification and Iodination of Waste Kish Graphite into High-Quality Electrocatalyst

      In-Yup Jeon, Sun-Hee Shin, Sun-Min Jung, Hyun-Jung Choi, Jiantie Xu and Jong-Beom Baek

      Version of Record online: 27 MAR 2017 | DOI: 10.1002/ppsc.201600426

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      Using mechanochemical ball-milling, waste Kish graphite (Kish-G) is simply converted into high-quality electrocatalyst for oxygen reduction reaction in alkaline media. Ball-milling Kish-G in the presence of iodine simultaneously purifies and functionalizes Kish-G into iodinated Kish-G (I-Kish-G) with low content of impurities, high iodine content, high degree of crystallinity, and high specific surface area.

  6. Communications

    1. Liquid-Crystal-Mediated 3D Macrostructured Composite of Co/Co3O4 Embedded in Graphene: Free-Standing Electrode for Efficient Water Splitting

      Md. Monirul Islam, Shaikh Nayeem Faisal, Taslima Akhter, Anup Kumar Roy, Andrew I. Minett, Konstantin Konstantinov and Shi Xue Dou

      Version of Record online: 3 MAR 2017 | DOI: 10.1002/ppsc.201600386

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      The self-assembly nature of liquid crystal graphene oxide leads the formation of free-standing electrode of metal/metal oxide (Co/Co3O4) embedded graphene. The formation of cobalt along with cobalt oxide in a 3D macro/microarchitecture graphene facilitates complete electrocatalytic water splitting through hydrogen evolution reaction as well as oxygen evolution reaction.

  7. Full Papers

    1. Secondary Interactions of Graphene Oxide on Liquid Crystal Formation and Stability

      Jun Young Oh, Jisoo Park, Yo Chan Jeong, Jae Ho Kim, Seung Jae Yang and Chong Rae Park

      Version of Record online: 24 FEB 2017 | DOI: 10.1002/ppsc.201600383

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      The influence of secondary interactions is discussed for their role in the self-assembly and stabilization of graphene oxides (GOs). Highly oxidized GOs show self-segregation and orientation behavior, which result in a liquid crystal (LC) phase. The strong hydrogen bonding networks between GOs in water enable the stabilization of GO LC dispersions for a long period.

  8. Progress Reports

    1. Liquid Crystals of Graphene Oxide: A Route Towards Solution-Based Processing and Applications

      Jizhen Zhang, Shayan Seyedin, Zhoujie Gu, Nisa Salim, Xungai Wang and Joselito M. Razal

      Version of Record online: 23 FEB 2017 | DOI: 10.1002/ppsc.201600396

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      Recent advancements in synthesis, processing, and applications of graphene oxide liquid crystals are summarized. The challenges and opportunities in effective utilization of graphene oxide liquid crystals for fabrication of various 1D, 2D, and 3D pristine and composite architectures with highly tailored microstructures are discussed. Guidelines are provided for the fabrication of the next-generation graphene-based structures with superior properties suitable for practical applications.

  9. Full Papers

    1. Dielectrophoretic Condensation and Tailored Phase Separation in Graphene Oxide Liquid Crystals

      Seung-Ho Hong, Tian-Zi Shen, Bomi Lee and Jang-Kun Song

      Version of Record online: 21 FEB 2017 | DOI: 10.1002/ppsc.201600344

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      Dielectrophoresis-induced spatial phase separation is demonstrated in graphene oxide (GO) liquid crystal dispersions. The local GO concentration can be arbitrarily controlled within a cell using field-induced local condensation, thereby yielding phase separation between the nematic region and isotropic or biphasic regions. The field-induced nematic phase shows good alignment along the field direction and is wrinkled along the perpendicular direction.

  10. Communications

    1. Strengthening and Stiffening Graphene Oxide Fiber with Trivalent Metal Ion Binders

      Wonsik Eom, Hun Park, Sung Hyun Noh, Ki Hwan Koh, Kichun Lee, Won Jun Lee and Tae Hee Han

      Version of Record online: 16 FEB 2017 | DOI: 10.1002/ppsc.201600401

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      Graphene oxide liquid crystal solutions are coagulated to fiber structures with the aid of multivalent metal cations. Compared to divalent cations, the fast diffusion of trivalent cations induces highly dense structures. The increased interlayer attraction force with trivalent cation binders results in mechanically stable fibers of a tensile strength of 486 MPa and a Young's modulus of 81 GPa.

    2. Amorphous Molybdenum Sulfide Deposited Graphene Liquid Crystalline Fiber for Hydrogen Evolution Reaction Catalysis

      Kyung Eun Lee, Suchithra Padmajan Sasikala, Ho Jin Lee, Gil Yong Lee, Sung Hwan Koo, Taeyeong Yun, Hong Ju Jung, InHo Kim and Sang Ouk Kim

      Version of Record online: 3 FEB 2017 | DOI: 10.1002/ppsc.201600375

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      Wet spinning of graphene oxide liquid crystal exploits 1D conductive catalyst support and electrochemical deposition realizes successful hybridization with amorphous molybdenum sulfide. Geometrical advantage of reduced graphene oxide (RGO) fiber can hold larger amount of amorphous molybdenum sulfide and optimized loading on RGO fiber provides high catalytic activity and stability for hydrogen evolution reaction.

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