Particle & Particle Systems Characterization

Cover image for Vol. 31 Issue 2

February 2014

Volume 31, Issue 2

Pages 171–283

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Progress Reports
    7. Communications
    8. Full Papers
    1. You have free access to this content
      Porous Films: Size Control of Porous Silicon Nanoparticles by Electrochemical Perforation Etching (Part. Part. Syst. Charact. 2/2014) (page 171)

      Zhengtao Qin, Jinmyoung Joo, Luo Gu and Michael J. Sailor

      Article first published online: 12 FEB 2014 | DOI: 10.1002/ppsc.201470007

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      Size-controlled porous silicon nanoparticles are prepared by pulsed electrochemical etching, followed by ultrasonic fracture of the freestanding porous layer. As described by Michael J. Sailor and co-workers on page 252, ultrasonic fracture selectively cleaves the porous film along the high-porosity perforations, providing selective improved size control and yields of the porous silicon nanoparticles without any complicated post- or preprocessing steps.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Progress Reports
    7. Communications
    8. Full Papers
    1. You have free access to this content
      Ink-Jet Printing: Ink-Jet Printed Nanoparticle Alignment Layers: Easy Design and Fabrication of Patterned Alignment Layers for Nematic Liquid Crystals (Part. Part. Syst. Charact. 2/2014) (page 172)

      Mitya Reznikov, Anshul Sharma and Torsten Hegmann

      Article first published online: 12 FEB 2014 | DOI: 10.1002/ppsc.201470008

      Thumbnail image of graphical abstract

      Ink-jet printing of monolayer-capped nanoparticles is introduced as a versatile and highly efficient means to pattern the alignment of nematic liquid crystals. As discussed by Torsten Hegmann and co-workers on page 257, any homeotropic alignment patterns that can be switched by applying AC or DC electric field can quickly be created with high accuracy ranging in size from a few micron (>850 dpi) to several square inch.

  3. Masthead

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Progress Reports
    7. Communications
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      Masthead: (Part. Part. Syst. Charact. 2/2014)

      Article first published online: 12 FEB 2014 | DOI: 10.1002/ppsc.201470010

  4. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Progress Reports
    7. Communications
    8. Full Papers
    1. You have free access to this content
      Contents: (Part. Part. Syst. Charact. 2/2014) (pages 173–177)

      Article first published online: 12 FEB 2014 | DOI: 10.1002/ppsc.201470009

  5. Progress Reports

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Progress Reports
    7. Communications
    8. Full Papers
    1. Optimized Synthetic Protocols for Preparation of Versatile Plasmonic Platform Based on Silver Nanoparticles with Pentagonal Symmetries (pages 178–189)

      Nimer Murshid, Dilyn Keogh and Vladimir Kitaev

      Article first published online: 1 SEP 2013 | DOI: 10.1002/ppsc.201300225

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      The detailed synthetic protocol for the synthesis of silver decahedra and faceted pentagonal rods is described here. The key novel aspects are oxidative etching with hydrogen peroxide and adaptation of LEDs. With the attained excellent size and shape selection and precise plasmonic tuning, these silver nanoparticles should serve as a versatile plasmonic platform for diverse application.

  6. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Progress Reports
    7. Communications
    8. Full Papers
    1. Controlled Synthesis of Single-Crystalline ZnO Nanoflakes on Arbitrary Substrates at Ambient Conditions (pages 190–194)

      Phani Kiran Vabbina, Mustafa Karabiyik, Chowdhury Al-Amin, Nezih Pala, Santanu Das, Wonbong Choi, Tanuj Saxena and Michael Shur

      Article first published online: 11 SEP 2013 | DOI: 10.1002/ppsc.201300208

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      2D ZnO nanoflakes on different substrates at ambient conditions are sonochemically synthesized. Synthesized nanostructures exhibit excellent electrical conductivity and optical transparency, which make them suitable for many electronic and optoelectronic applications. The process is low-temperature, fast, environmentally benign, CMOS-compatible, scalable, and potentially high-throughput.

    2. Superior Catalytic Effects of Transition Metal Boride Nanoparticles on the Reversible Hydrogen Storage Properties of Li-Mg-B-H System (pages 195–200)

      Xiulin Fan, Xuezhang Xiao, Lixin Chen, Jie Shao, Liuting Zhang, Shouquan Li, Hongwei Ge and Qidong Wang

      Article first published online: 25 AUG 2013 | DOI: 10.1002/ppsc.201300171

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      By directly doping transition metal boride (NbB2, ZrB2, and CeB6) nanoparticles with size of less than 10 nm into 2LiBH4/MgH2 composites, a significant catalytic enhancement is achieved. As the representative catalyzed system, the nanoNbB2-doped composite can release ca. 9.0 wt% H2 in 15 min and reabsorb ca. 9.0 wt% H2 in 5 min, which show more than 30 and 20 times faster than undoped system.

    3. Conjugation of Graphene Oxide with DNA-Modified Gold Nanoparticles to Develop a Novel Colorimetric Sensing Platform (pages 201–208)

      Chao Li, Yucai Yang, Bin Zhang, Guifang Chen, Zhaoxia Wang and Genxi Li

      Article first published online: 26 JUL 2013 | DOI: 10.1002/ppsc.201300200

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      Single-strand DNA-modified Au–nanoparticles (ssDNA–AuNPs) are used to cross-link graphene oxide (GO) and lead to the final formation of a soft complex, while no such precipitation is observed with double-stranded or otherwise well-folded structure-modified AuNPs. Based on this finding, novel red-to-white colorimetric assays that allow simple, sensitive, and selective detection of a broad range of targets including DNA, small biomolecule, metal ions are reported.

  7. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Progress Reports
    7. Communications
    8. Full Papers
    1. Gold-Nanoparticle-Assisted Self-Assembly of Chemical Gradients with Tunable Sub-50 nm Molecular Domains (pages 209–218)

      Anders Lundgren, Mats Hulander, Joakim Brorsson, Malte Hermansson, Hans Elwing, Olof Andersson, Bo Liedberg and Mattias Berglin

      Article first published online: 13 AUG 2013 | DOI: 10.1002/ppsc.201300154

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      Chemical gradients with the resolution needed to address complex biological binding events at the single protein level are prepared using surface-deposited gold nanoparticles as a versatile template for orthogonal chemical modifications. The effect of hydrophobic domain arrangement on the sub-50 nm scale is shown to influence binding of fimbriae carrying E. coli bacteria.

    2. Phosphonated Polyethylenimine-Coated Nanoparticles: Size- and Zeta-Potential-Adjustable Nanomaterials (pages 219–227)

      Clément Monteil, Nathalie Bar, Bernard Moreau, Richard Retoux, Agnès Bee, Delphine Talbot and Didier Villemin

      Article first published online: 23 AUG 2013 | DOI: 10.1002/ppsc.201300185

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      Partially phosphonated polyethylenimines are promising polymers for nanoparticle (NP)  surface modification. A number of phosphonate and amino groups are easily controlled and permit to access to the functionalized NPs with a large range of zeta potential and diameter. The strong anchoring on metal oxide NPs is assumed by phosphonates. Numerous amine functions preserve dispersion and are the key to a subsequent biofunctionalization.

    3. Encapsulation of Photosensitizers and Upconversion Nanocrystals in Lipid Micelles for Photodynamic Therapy (pages 228–235)

      Han Jie Wang, Rishav Shrestha and Yong Zhang

      Article first published online: 26 AUG 2013 | DOI: 10.1002/ppsc.201300189

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      The photosensitizer zinc phthalocyanine (ZnPc) and upconversion nanocrystals (UCNs) are encapsulated into OQPGA-PEG/RGD/TAT lipid micelles for targeted photodynamic therapy (PDT) by using deep-penetrating NIR light as the light source.

    4. Synthesis and Reactivity of Magnetically Diverse Au@Ni Core–Shell Nanostructures (pages 236–244)

      Vysakh A. Bharathan, Govind K. Raj, Pattayil A. Joy and Chathakudath P. Vinod

      Article first published online: 21 AUG 2013 | DOI: 10.1002/ppsc.201300195

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      Nickel nanoparticles that are traditionally prone to ambient surface oxidation and that are ferromagnetic in character are prepared both in magnetic and non-magnetic character employing a core–shell methodology using gold seeds. These electronically and geometrically modified sub-10-nm bimetallic particles show excellent oxidation resistance and enhanced catalytic activity.

    5. Rapid, Microwave-Assisted, and One-Pot Synthesis of Magnetic Palladium–CoFe2O4–Graphene Composite Nanosheets and Their Applications as Recyclable Catalysts (pages 245–251)

      Xiaofeng Lu, Liu Yang, Xiujie Bian, Danming Chao and Ce Wang

      Article first published online: 26 AUG 2013 | DOI: 10.1002/ppsc.201300216

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      Magnetic Pd–CoFe2O4–graphene composite nanosheets are prepared via a rapid, microwave-assisted, and one-pot approach. The as-prepared Pd–CoFe2O4–graphene composite nanosheets exhibit a high catalytic performance toward the reduction of p-nitrophenol.

    6. Size Control of Porous Silicon Nanoparticles by Electrochemical Perforation Etching (pages 252–256)

      Zhengtao Qin, Jinmyoung Joo, Luo Gu and Michael J. Sailor

      Article first published online: 28 AUG 2013 | DOI: 10.1002/ppsc.201300244

      Thumbnail image of graphical abstract

      Size-controlled porous silicon nanoparticles are prepared by pulsed electrochemical etching, followed by ultrasonic fracture of the stratified film. The method provides porous silicon nanoparticles with improved uniformity and yield without the need for complicated post- or preprocessing steps.

    7. Ink-Jet Printed Nanoparticle Alignment Layers: Easy Design and Fabrication of Patterned Alignment Layers for Nematic Liquid Crystals (pages 257–265)

      Mitya Reznikov, Anshul Sharma and Torsten Hegmann

      Article first published online: 11 SEP 2013 | DOI: 10.1002/ppsc.201300248

      Thumbnail image of graphical abstract

      Ink-jet printing of monolayer-capped gold nanoparticles is introduced as a versatile and highly efficient means to pattern the alignment of nematic liquid crystals. Any homeotropic alignment patterns can be created quickly ranging in size from 30 μm (850 dpi) to several square inches, with high accuracy that does not deteriorate with time. Depending on the alignment underlayer, intermediate configurations between homeotropic and homogeneous are also feasible

    8. Successive, Seed-Mediated Growth for the Synthesis of Single-Crystal Gold Nanospheres with Uniform Diameters Controlled in the Range of 5–150 nm (pages 266–273)

      Yiqun Zheng, Xiaolan Zhong, Zhiyuan Li and Younan Xia

      Article first published online: 26 AUG 2013 | DOI: 10.1002/ppsc.201300256

      Thumbnail image of graphical abstract

      Single-crystal gold nanospheres with diameters controlled in the range of 5–150 nm are successfully prepared. The use of a slow injection rate for the gold precursor to enable surface diffusion for the atoms added onto the surface of a seed, promoting the growth of seeds into larger particles without losing the spherical shape.

    9. Silver Nanocube Aggregates in Cylindrical Pores for Higher Refractive Index Plasmonic Sensing (pages 274–283)

      Tobias König, Rajesh Kodiyath, Zachary A. Combs, Mahmoud. A. Mahmoud, Mostafa A. El-Sayed and Vladimir V. Tsukruk

      Article first published online: 11 SEP 2013 | DOI: 10.1002/ppsc.201300217

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      An experimental record is found in a refractive index sensitivity of about 770 nm per refractive index unit for silver nanocube aggregates within cylindrical pores (experimental FoM of 2.4, theoretical FoM of 3.8). Numerical simulations (FDTD method) suggest that the enhanced sensitivity is based on plasmonic amplification of localized surface plasmon resonance coupling, called inter-pore coupling plasmonic effect.

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