Particle & Particle Systems Characterization

Cover image for Vol. 31 Issue 7

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

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  2. 21 - 39
  1. Communications

    1. You have full text access to this OnlineOpen article
      Nanoparticle Aggregate-Based Fluorescence Enhancement for Highly Sensitive and Reproducible Detection of DNA

      Carla Annink and Ron Gill

      Article first published online: 28 APR 2014 | DOI: 10.1002/ppsc.201400061

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      Sensitive detection of DNA at the sub picomolar range is demonstrated using a magnetic bead sandwich hybridization assay coupled with surface-enhanced fluorescence (SEF)-based amplification. Unlike enzymatic amplification, the SEF amplification step does not add any additional background to the measurement and does not cause a significant increase in the coefficient of variance (CV).

  2. Full Papers

    1. Facile Synthesis of Porous MnO Microspheres for High-Performance Lithium-Ion Batteries

      Xiuwan Li, Xiaonan Shang, Dan Li, Hongwei Yue, Suiyan Wang, Li Qiao and Deyan He

      Article first published online: 17 APR 2014 | DOI: 10.1002/ppsc.201400010

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      Porous MnO microspheres as an anode material of Li-ion batteries are synthesized by a facile approach. The formation of the nano-sized particles during cycling further shortens the diffusion length of Li+ and enhances the transport capacity of e in the active material, and the porous structure can accommodate the volume change caused by electrochemical reaction.

    2. Evaluation of Rod-Shaped Nanoparticles as Carriers for Gene Delivery

      Min-Min Fan, Wan-Zhen Zhang, Cong Cheng, Yan Liu, Bang-Jing Li, Xun Sun and Sheng Zhang

      Article first published online: 9 APR 2014 | DOI: 10.1002/ppsc.201300383

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      Rod-shaped and spherical nanoparticles for efficient gene delivery are obtained by self-assembly of polyethylenimine-methoxy poly(ethylene glycol) (PEI-mPEG) and α-cyclodextrin (α-CD). The rod-shaped carrier shows four times higher gene delivery capability than its spherical counterpart. Considering the similar chemical structure of nanosphere and nanorod, the shape effect is proposed to play a key role for the enhancement of gene transfection.

  3. Communications

    1. Engineering of Bismuth Oxide Nanoparticles to Induce Differential Biochemical Activity in Malignant and Nonmalignant Cells

      Callum Stewart, Konstantin Konstantinov, Marjorie McDonald, Kathrin Bogusz, Dean Cardillo, Sianne Oktaria, Dongqi Shi, Michael Lerch, Thierry Devers, Stéphanie Corde, Anatoly Rosenfeld and Moeava Tehei

      Article first published online: 9 APR 2014 | DOI: 10.1002/ppsc.201300380

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      The relationship between cytotoxicity and the levels of oxidative stress is reported with respect to annealing atmosphere in malignant 9L gliosarcoma tumor and nonmalignant Madin-Darby canine kidney cell lines.

  4. Full Papers

    1. Low-Magnetization Magnetic Microcapsules: A Synergistic Theranostic Platform for Remote Cancer Cells Therapy and Imaging

      Wei Zhang, Lin Deng, Guangchao Wang, Xianrong Guo, Qiujin Li, Jianfei Zhang and Niveen M. Khashab

      Article first published online: 2 APR 2014 | DOI: 10.1002/ppsc.201400005

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      Magnetic microcapsules (MCCs) with magnetic saturation below 2.5 emu g−1 demonstrate combined hyperthermia, chemotherapy, and magnetic resonance imaging capabilities. The MCCs are prepared by a layer-by-layer technique using polyelectrolytes and hydrophilic SPIOs. This multifunctional platform shows synergistic drug release under magnetic hyperthermia stimulus and acidic pH coupled with improved cell death through cell heating.

  5. Communications

    1. A Novel Red-Blood-Cell-Shaped Pectin-Oligochitosan Hydrogel System

      Jenna Nicole Harvestine, Brandon Anthony Mikulski, Kirsten Mary Mahuta, James Zachary Crouse, Xiaoru Guo, Jung Chull Lee, Katarina Senn Midelfort, Junhong Chen and Wujie Zhang

      Article first published online: 1 APR 2014 | DOI: 10.1002/ppsc.201400002

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      The biocompatible red-blood-cell-shaped pectin–oligochitosan hydrogel capsule offers a large surface area to volume ratio, which improves transport capacity compared to the spherical one. This hydrogel capsule system can be used not merely for controlled delivery/release of bioactive agents, cell immobilization, or cell encapsulation towards regenerative medicine and tissue engineering, but also for creating artificial red blood cells/artificial blood.

  6. Full Papers

    1. A Multifunctional Magnetic Composite Material as a Drug Delivery System and a Magnetic Resonance Contrast Agent

      Guilong Zhang, Junlan Gao, Junchao Qian, Dongqing Cai, Kang Zheng, Zhiwu Yu, Junfeng Wang, Kai Zhong, Xin Zhang and Zhengyan Wu

      Article first published online: 1 APR 2014 | DOI: 10.1002/ppsc.201300366

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      A multifunctional material (Fe3O4@HSiO2) to be used as a magneticresonance (MR) contrast agentand a drug delivery system is fabricated based on hydrogenation-silica encapsulated magnetic iron oxide. This material shows high drug capacity, good magnetic targeting performance, and excellent MR enhancement effects. It has potential applications in targeting specific tumor tissue, delivering anticancer drugs, and monitoring the variation of the tumors by MR imaging (MRI).

  7. Progress Reports

    1. Ligand Exchange on Gold Nanorods: Going Back to the Future

      A. Swarnapali D. S. Indrasekara, Robert C. Wadams and Laura Fabris

      Article first published online: 1 APR 2014 | DOI: 10.1002/ppsc.201400006

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      Ligand exchange on gold nanorods is examined in this Progress Report. The main applications of gold nanorods are summarized, and the importance of ligand exchange in this context is highlighted. Ligand exchange mechanisms, CTAB toxicity and removal, and the relevant characterization techniques are overviewed. The importance of understanding the interface and devising experiments to characterize it are also described.

  8. Communications

    1. Electroless Bimetal Decoration on N-Doped Carbon Nanotubes and Graphene for Oxygen Reduction Reaction Catalysts

      Won Jun Lee, Dong Sung Choi, Sun Hwa Lee, Joonwon Lim, Ji Eun Kim, Dong Jun Li, Gil Yong Lee and Sang Ouk Kim

      Article first published online: 27 MAR 2014 | DOI: 10.1002/ppsc.201300364

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      N-doped sites at carbon nanotubes and graphene trigger the spontaneous decoration of bimetal (Pt and Pd) particles by the facile electroless redox reaction. The created hybrid catalyst yields remarkable current density (≈2.44 mA cm−2), lower onset potential (≈0.13 V), higher electron transfer number ≈4), and long-term stability for oxidation–reduction reactions.

    2. Nanosilver Could Usher in Next-Generation Photoprotective Agents for Magnesium Porphyrins

      Laurent Bekalé, Saïd Barazzouk and Surat Hotchandani

      Article first published online: 24 MAR 2014 | DOI: 10.1002/ppsc.201400008

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      A novel strategy, based on silver nanoparticles (AgNPs), has been developed for simultaneously improving: 1) photostability, 2) fluorescence emission, and 3) singlet oxygen generation ability of natural porphyrin (i.e., chlorophyll (Chl) molecules). The benefit of AgNPs as photoprotector of Chl is that they spontaneously bind with the nitrogen atoms of Chl as soon as they are mixed together, even in the dark prior to the illumination, inhibiting thus the binding of reactive oxygen species (ROS) at nitrogen sites, known to cause the photodegradation of porphyrins.

    3. Direct Formation of Hedgehog-Like Hollow Ni-Mn Oxides and Sulfides for Supercapacitor Electrodes

      Houzhao Wan, Jianjun Jiang, Yunjun Ruan, Jingwen Yu, Li Zhang, Haichao Chen, Ling Miao and Shaowei Bie

      Article first published online: 20 MAR 2014 | DOI: 10.1002/ppsc.201400020

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      A hedgehog-like hollow Ni-Mn precursor with uniform ordered 1D nanostructures is prepared by a facile directional Mn-induced approach. The Ni-Mn oxides and sulfides are obtained after thermal treatment and vulcanization for the studied precursor and retain the morphology. The excellent electrochemical performance two products have promising potentials for future energy storage systems.

  9. Full Papers

    1. Size-Dependent Room Temperature Oxidation of Tin Particles

      Eli Sutter, Francisco Ivars-Barcelo and Peter Sutter

      Article first published online: 19 MAR 2014 | DOI: 10.1002/ppsc.201300352

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      Transmission electron microscopy images of polydisperse arrays of tin (Sn) nanoparticles provide snapshots of the extent of oxidation of particles with different sizes at specific durations of exposure to oxidizing conditions. The oxide thickness is strongly size dependent, i.e., the SnO forming on the surface of Sn particles not only thickens with time but importantly smaller particles have much thicker oxides than larger ones due to their higher curvature.

  10. Communications

    1. One-Pot Synthesis of Functionalized Noble Metal Nanoparticles Using a Rationally Designed Phosphopeptide

      Stefanie Papst, Margaret A. Brimble, Richard D. Tilley and David E. Williams

      Article first published online: 19 MAR 2014 | DOI: 10.1002/ppsc.201300381

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      The rational design of a capping peptide for the synthesis of various noble metal nanoparticles is presented. The peptide contains nonnatural, phosphonated amino acids introduced via the Huisgen cycloaddition reaction for improved binding to mineralized tissue. As proof of the design concept, water-soluble palladium, platinum, silver, gold, and rhodium nanocrystals are synthesized in one step from simple precursors.

  11. Full Papers

    1. Designing Zwitterionic SiO2NH2-Au Particles with Tunable Patchiness using Wrinkles

      Roland Brüx, Stephanie Hiltl, Vera Schröder, Carolina von Essen and Alexander Böker

      Article first published online: 13 MAR 2014 | DOI: 10.1002/ppsc.201300354

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      Zwitterionic SiO2NH2-Au patchy particles are synthesized by a three-step template method using nanostructured wrinkles. Patchiness (0.82–1.84) is tuned by the template dimensions. The particles' surface charge is switchable by changing the pH. Owing to adjustable Janus character, surface charge and charge distribution, the particles show pronounced interfacial activity suitable for emulsion and foam applications.

    2. Systemic Administration of Polymer-Coated Nano-Graphene to Deliver Drugs to Glioblastoma

      Thomas L. Moore, Rama Podilakrishna, Apparao Rao and Frank Alexis

      Article first published online: 11 MAR 2014 | DOI: 10.1002/ppsc.201300379

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      Coating nano-graphene with PLA-PEG for the controlled delivery of paclitaxel (PTX): A multifunctional PLA-PEG coating improves the utility of nano-graphene as a drug delivery vehicle by facilitating the encapsulation and controlled release of the anticancer drug PTX. The polymer coating reduced nano-graphene toxicity in vitro, and nanoparticle were able to localize into intracranial brain tumors following systemic injection in mice.

    3. Microtubule-Templated Cadmium Sulfide Nanotube Assemblies

      Erik D. Spoerke, Bridget A. Connor, Dara V. Gough, Bonnie B. McKenzie and George D. Bachand

      Article first published online: 11 MAR 2014 | DOI: 10.1002/ppsc.201400013

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      Biological microtubules (MTs) are used as nanoscale templates for the bioinspired synthesis of cadmium sulfide (CdS) nanotubes. Biomediated assembly of the MTs into secondary architectures such as linear arrays, rings, and asters facilitates the formation of unique semiconducting CdS nanostructures.

    4. Ultrahigh-Density Plasmonic-Nanoparticle-Sensitized Semiconductor Photocatalysts Profit from Cooperative Light Harvesting and Charge Separation Processes: Experiments, Simulations, and Multifunctional Plasmonics

      Tung-Han Yang, Li-De Huang, Ming-Yang Pan, Yeu-Wei Harn, Miao-Chun Chen, Chun-Cheng Lin, Pei-Kuen Wei and Jenn-Ming Wu

      Article first published online: 11 MAR 2014 | DOI: 10.1002/ppsc.201400001

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      The enhancement of photoactivity via cooperative light harvesting and charge separation processes due to coupling of ultrahigh-density plasmonic nanoparticles to semiconductor photocatalysts is confirmed by experimental probes and electromagnetic simulations. Moreover, hybrid structures based on the plasmonic nanoparticles and diverse nanostructures (films, nanorods, mesoporous, and nanotubes) or functional materials (multiferroic BiFeO3, CuInGaSe2 absorber layers, and photoactive TiO2) are successfully constructed.

  12. Communications

    1. Multi-Responsive Janus Liquid Marbles: The Effect of Temperature and Acidic/Basic Vapors

      Zhiguang Xu, Yan Zhao, Liming Dai and Tong Lin

      Article first published online: 10 MAR 2014 | DOI: 10.1002/ppsc.201400009

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      A Janus liquid marble is developed to impart multi-responsiveness to a single liquid marble, which can not only be transported on both solid substrates and the liquid water surface by magnetic force, but can also be ruptured upon exposure to either infrared radiation or acidic/basic vapors. This work opens up new possibilities in smart-droplet-based microfluidics and various liquid manipulations.

    2. Synthesis of Marks-Decahedral Pd Nanoparticles in Aqueous Solutions

      Wenhai Ji, Weihong Qi, Shasha Tang, Baiyun Huang, Mingpu Wang, Yuan Li, Yanlin Jia and Yong Pang

      Article first published online: 10 MAR 2014 | DOI: 10.1002/ppsc.201400003

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      Marks-decahedral Pd nanoparticles have been synthesized by using the hydroxyl end group of poly(vinyl pyrrolidone) (PVP) to reduce PdCl2 in water. The morphology of particles can be controlled by adjusting the mass ratio of the salt precursor to PVP.

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