Particle & Particle Systems Characterization

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  1. 1 - 46
  1. Full Papers

    1. Water-Soluble Monolayer Molybdenum Disulfide Quantum Dots with Upconversion Fluorescence

      Hao Huang, Cuicui Du, Hongyan Shi, Xun Feng, Jin Li, Yanlei Tan and Wenbo Song

      Article first published online: 31 JUL 2014 | DOI: 10.1002/ppsc.201400101

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      Water-soluble monolayer MoS2 quantum dots (MQDs) with a lateral size of ≈2.1 nm are successfully synthesized using a facile one-pot hydrothermal method. The MQDs have a large direct transition energy beyond that of the nanosheets and exhibit pronounced optical properties. Unusual upconversion photoluminescence is also observed and a mechanism for this is proposed. The application of MQDs as a fluorescent reagent for detecting antibiotics is demonstrated.

    2. Extremophilic Polysaccharide for Biosynthesis and Passivation of Gold Nanoparticles and Photothermal Ablation of Cancer Cells

      Sreejith Raveendran, Neha Chauhan, Vivekanandan Palaninathan, Yutaka Nagaoka, Yasuhiko Yoshida, Toru Maekawa and D. Sakthi Kumar

      Article first published online: 28 JUL 2014 | DOI: 10.1002/ppsc.201400081

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      Biocompatible extremophilic bacterial polysaccharide-based mauran-gold nano­composite structures are synthesized for photothermal ablation cancer therapy. Application of Mauran as a versatile biocompatible material for synthesis and passivation of gold nanoparticles in the presence and absence of a reducing agent is described. Mauran-gold nanocomposites synthesized are superior to conventionally synthesized gold nanoparticles in photothermal ablation cancer therapy.

  2. Progress Reports

    1. Review of Sn-Doped Hematite Nanostructures for Photoelectrochemical Water Splitting

      Yichuan Ling and Yat Li

      Article first published online: 28 JUL 2014 | DOI: 10.1002/ppsc.201400051

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      The Sn-doped hematite photoelectrodes show excellent photoactivity because the n-type Sn dopant modifies their optical and electrical properties. The recent achievements in the controlled synthesis of Sn-doped hematite and their implementation as photoelectrodes for solar water splitting are highlighted. The challenges and opportunities associated with Sn-doped hematite photoelectrodes are also discussed.

  3. Full Papers

    1. Determination of Thermal History by Photoluminescence of Core-Shelled Quantum Dots Going Through Heating Events

      Yucheng Lan, Hui Wang, Nitin Skula, Xiaoyuan Chen, Yalin Lu, Gang Chen and Zhifeng Ren

      Article first published online: 28 JUL 2014 | DOI: 10.1002/ppsc.201400100

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      Thermal histories are permanently recorded by CdSe/ZnS core-shelled quantum dots (QDs) at microscale using photoluminescence (PL) spectroscopy and reconstructed later using a theoretical model. Theoretical equations are established between the PL shift and heating temperature/duration of thermal events. Here, it is demonstrated how to reconstruct the temperature and duration of a fast heating event simultaneously from PL spectra of the QDs.

    2. Ab Initio Simulation of Charge Transfer at the Semiconductor Quantum Dot/TiO2 Interface in Quantum Dot-Sensitized Solar Cells

      Xukai Xin, Bo Li, Jaehan Jung, Young Jun Yoon, Rana Biswas and Zhiqun Lin

      Article first published online: 24 JUL 2014 | DOI: 10.1002/ppsc.201400111

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      A rigorous ab initio density functional approach is utilized to simulate the electronic properties of CdSe and PbSe QDs with different sizes on the TiO2 substrate. Electron bridging states between QDs and TiO2 are observed, corroborating the fast adiabatic charge transfer from QD to TiO2. Increasing conduction band offsets together with decreasing QD size facilitates the charge transfer from QDs to TiO2.

    3. Docetaxel-Loaded Nanoparticles of Dendritic Amphiphilic Block Copolymer H40-PLA-b-TPGS for Cancer Treatment

      Xiaowei Zeng, Wei Tao, Zhongyuan Wang, Xudong Zhang, Huijun Zhu, Yanping Wu, Yongfeng Gao, Kewei Liu, Yuyang Jiang, Laiqiang Huang, Lin Mei and Si-Shen Feng

      Article first published online: 24 JUL 2014 | DOI: 10.1002/ppsc.201400048

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      A new dendritic block copolymer, H40-poly(d,l-lactide)-block-d-α-tocopheryl polyethylene glycol 1000 succinate (H40-PLA-b-TPGS), is synthesized for nanoparticles (NPs) formulation of docetaxel (DTX) for cancer therapy, which is found to have higher drug-loading content and encapsulation efficiency, faster drug release, higher cellular uptake, and cytotoxicity in vitro as well as tumor suppressing effects in vivo than the linear poly(lactic acid) (PLA) NP formulation and Taxotere.

  4. Communications

    1. Disaggregation and Anionic Activation of Nanodiamonds Mediated by Sodium Hydride—A New Route to Functional Aliphatic Polyester-Based Nanodiamond Materials

      Yang Sun, Peter Olsén, Thilo Waag, Anke Krueger, Doris Steinmüller-Nethl, Ann-Christine Albertsson and Anna Finne-Wistrand

      Article first published online: 24 JUL 2014 | DOI: 10.1002/ppsc.201400098

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      Polylactide-modified nanodiamond particles (n-DP-g-PLA) are prepared by sodium-hydride-activated nanodiamond-initated anionic ring-opening polymerization. Activated nanodiamond particles repel each other, preventing agglomeration during the polymerization. This universal modification provides a platform for the functionalization of all types of nanoparticles containing hydroxyl groups.

  5. Full Papers

    1. Probing Zinc–Protein–Chelant Interactions Using Gold Nanoparticles Functionalized with Zinc-Responsive Polypeptides

      Wing Cheung Mak, Robert Selegård, Magnus Garbrecht and Daniel Aili

      Article first published online: 17 JUL 2014 | DOI: 10.1002/ppsc.201400082

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      A method for probing the complexation of zinc by polypeptides and chelants is described. Specific binding of zinc to a de novo designed polypeptide immobilized on gold nanoparticles triggers nanoparticle aggregation. The effect of chelants on the aggregation is reflected by the changes in the plasmon band, which provide extensive information about the nature of the interactions.

    2. Rapid, Reversible Release from Thermosensitive Liposomes Triggered by Near-Infra-Red Light

      Natalie Forbes, Alessia Pallaoro, Norbert O. Reich and Joseph A. Zasadzinski

      Article first published online: 14 JUL 2014 | DOI: 10.1002/ppsc.201400035

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      Near-infra-red light induces rapid release of doxorubicin from thermosensitive liposomes tethered to plasmon-resonant hollow gold nanoshells. The continuously irradiated gold nanoshells heat the liposome from 37 to 40 °C, inducing a permeability transition that provides complete contents release in minutes. The combination of doxorubicin and heat provides a synergistic effect on prostate cancer cell toxicity in vitro

    3. Thermoresponsive Gold Polymer Nanohybrids with a Tunable Cross-Linked MEO2MA Polymer Shell

      Alejandro Lapresta-Fernández, José Manuel García-García, Rodrigo París, Rafael Huertas-Roa, Alfonso Salinas-Castillo, Sabrina Anderson de la Llana, José Fernando Huertas-Pérez, Nekane Guarrotxena, Luis Fermín Capitán-Vallvey and Isabel Quijada-Garrido

      Article first published online: 10 JUL 2014 | DOI: 10.1002/ppsc.201400078

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      Multifunctional thermoresponsive hybrid nanosystems consisting of a gold nanoparticle core and a poly(2-(2-methoxyethoxy)ethyl methacrylate) (P(MEO2MA))-based hydrogel shell are synthesized. Control over the shell thickness, size, and the swelling/shrinking capability of the shell can be fine-tuned by changing MEO2MA/cross-linker/gold nanoparticle ratio. This results in thermally modulated optical properties of the nanohybrid systems.

    4. SERS Platforms of Plasmonic Hydrophobic Surfaces for Analyte Concentration: Hierarchically Assembled Gold Nanorods on Anodized Aluminum

      Moritz Tebbe, Pavel Cherepanov, Ekaterina V. Skorb, Sergey K. Poznyak, Javier García de Abajo, Andreas Fery, Daria V. Andreeva, Ramon A. Alvarez Puebla and Nicolas Pazos-Perez

      Article first published online: 2 JUL 2014 | DOI: 10.1002/ppsc.201400062

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      Anodized aluminum oxide with parallel linear periodicities is used as a template to organize gold nanorods via spin coating. The long axes of the gold nanorods are oriented along the lines, inducing tip-to-tip plasmonic coupling and generating highly active hotspots. Additionally, the inherent hydrophobicity of the substrate allows for analyte concentration determination making these substrates ideal surface-enhanced Raman scattering (SERS) platforms.

    5. Three Dimensional Branched Gold Nanostructures on Reduced Graphene Oxide Films Formed at a Liquid/Liquid Interface

      Kommula Bramhaiah, Vidya N. Singh and Neena S. John

      Article first published online: 1 JUL 2014 | DOI: 10.1002/ppsc.201400037

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      Branched Au nanostructures anchored on reduced graphene oxide (rGO) thin films are obtained at an aqueous/organic interface by in situ reduction and self-assembly in the presence of a binary mixture of surfactants without any addition of seed crystals. These hybrid films exhibit absorption in the near-infrared region arising from the shape anisotropy of the nanostructures.

    6. A High-Performance Anode Material for Li-Ion Batteries Based on a Vertically Aligned CNTs/NiCo2O4 Core/Shell Structure

      Wenwen Liu, Congxiang Lu, Kun Liang and Beng Kang Tay

      Article first published online: 1 JUL 2014 | DOI: 10.1002/ppsc.201400030

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      Vertically aligned CNTs/NiCo2O4 core/shell structures exhibit high and stable reversible capacity, excellent rate capability, and good cycle stability when used as anode materials. The synthetic strategy presented provides a new method for fabricating the controlled core/shell structure, which may be a promising method for synthesizing electrode materials for advanced Li-ion batteries and other energy storage devices.

    7. High-Density Lipoprotein Nanoparticles Deliver RNAi to Endothelial Cells to Inhibit Angiogenesis

      Sushant Tripathy, Elena Vinokour, Kaylin M. McMahon, Olga V. Volpert and C. Shad Thaxton

      Article first published online: 16 JUN 2014 | DOI: 10.1002/ppsc.201400036

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      Synthetic high-density lipoprotein nanoparticles (HDL NPs) functionalized with RNAi (RNAi–HDL NPs) are efficient delivery vehicles for regulating target gene expression in endothelial cells (ECs) that express scavenger receptor type B-1. RNAi–HDL NPs carrying RNAi against vascular endothelial growth factor receptor 2 (VEGFR2) inhibit VEGF-dependent EC processes in vitro and reduce angiogenesis in in vivo model systems.

    8. Highly Luminescent Carbon-Nanoparticle-Based Materials: Factors Influencing Photoluminescence Quantum Yield

      Songnan Qu, Dezhen Shen, Xingyuan Liu, Pengtao Jing, Ligong Zhang, Wenyu Ji, Haifeng Zhao, Xiwu Fan and Hong Zhang

      Article first published online: 13 JUN 2014 | DOI: 10.1002/ppsc.201400055

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      Luminescent carbon nanoparticles (CNPs) of large size distribution (1–60 nm) are synthesized. Energy transfer is confirmed to occur from small CNPs (1–7 nm) to large CNPs (10–60 nm). Enhanced photo­luminescence quantum yield can be achieved by separating off large CNPs and in high-viscosity solvents. Photoluminescence quantum yields higher than 90% are achieved in small size CNPs embedded commercial glue water films.

  6. Communications

    1. Size-Controlled Synthesis of Ag8SnS6 Nanocrystals for Efficient Photoenergy Conversion Systems Driven by Visible and Near-IR Lights

      Tatsuya Kameyama, Shigetoshi Fujita, Hideaki Furusawa and Tsukasa Torimoto

      Article first published online: 13 JUN 2014 | DOI: 10.1002/ppsc.201400054

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      Near-IR-responsive semiconductor nanocrystals (NCs) of Ag8SnS6 composed of low-toxic elements are newly developed by the thermal decomposition of precursors in oleylamine. The size of Ag8SnS6 NCs can be controlled from 6 to 13 nm by increasing reaction temperature. The photosensitization of ZnO rod electrodes with Ag8SnS6 NCs is much more efficient than those with conventional Ag-based NCs such as Ag2S.

    2. Ultrathin Nanoflakes Assembled 3D Hierarchical Mesoporous Co3O4 Nanoparticles for High-Rate Pseudocapacitors

      Yuqian Fan, Guangjie Shao, Zhipeng Ma, Guiling Wang, Haibo Shao and Shuai Yan

      Article first published online: 2 JUN 2014 | DOI: 10.1002/ppsc.201400066

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      A novel 3D hierarchical mesoporous Co3O4 structure assembled by ultrathin nanoflakes (2.4 nm in thickness) has been successfully developed. Combining a high specific surface area (183.8 m2 g–1), mesoporosity, and a stable 3D hierarchical structure render the as-synthesized 3D Co3O4 the properties of a promising active material for high-rate pseudocapacitors with high specific capacitance, excellent rate capability, and durable long-term stability.

  7. Reviews

    1. Noble Metal Clusters: Applications in Energy, Environment, and Biology

      Ammu Mathew and Thalappil Pradeep

      Article first published online: 26 MAY 2014 | DOI: 10.1002/ppsc.201400033

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      Unique applications of sub-nanometer clusters of noble metals protected with ligands are reviewed in the context of their chemistry. Size-dependent luminescence in the visible region is their single-most important property exploited in such applications. A concomitant discrete electronic structure leads to unusual catalytic and energy harvesting properties. Chemistry of the ligands in conjunction with the electronic structure of the core allows applications in biology.

  8. Communications

    1. Poly(Acrylic Acid)-Capped and Dye-Loaded Graphene Oxide-Mesoporous Silica: A Nano-Sandwich for Two-Photon and Photoacoustic Dual-Mode Imaging

      Kim Truc Nguyen, Sivaramapanicker Sreejith, James Joseph, Tingchao He, Parijat Borah, Eng You Guan, Sun Woh Lye, Handong Sun and Yanli Zhao

      Article first published online: 15 MAY 2014 | DOI: 10.1002/ppsc.201400044

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      Growth of mesoporous silica on both sides of graphene oxide affords a nano-sandwich (NS) material. A two-photon active dye is then loaded into the mesopores of the NS followed by sealing with poly(acrylic acid). The obtained hybrid exhibits low cytotoxicity and excellent capability for two-photon and photoacoustic dual-mode bioimaging.

  9. Full Papers

    1. Hierarchical Stable Enzyme Microenvironments for High-Temperature Stability in Amine Solvents

      Geraldine Merle, Morgane Seon-Lutz, Joao Henrique Lopes and Jake E. Barralet

      Article first published online: 15 MAY 2014 | DOI: 10.1002/ppsc.201400025

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      Immobilized carbonic anhydrase on phosphate ultrasound assembled hybrid organic–inorganic nanoporous microparticles with high surface area interacts efficiently with alkanolamine solvent used for CO2 sequestration. These hierarchically structured particles show an unprecedented stability in tertiary amines and enable separation and facile re-use.

  10. Communications

    1. Coloring of Polystyrene Nanoparticles Assembling on Graphene in Aqueous Solution

      Jun Dong, Qing Yang and Jian Weng

      Article first published online: 15 MAY 2014 | DOI: 10.1002/ppsc.201400019

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      Coloring of polystyrene: Polystyrene nanoparticles assembled on graphene functionalized with polymers can stably be dispersed in water, ethanol, methanol, and polyethylene glycol with a lightful blue. The nanoparticles can also change from blue to white very quickly when trace benzene (1.0 ng mL−1) exists, which would have a potential application in benzene detection by the naked eye.

  11. Reviews

    1. Gold and Silver Nanomaterial-Based Optical Sensing Systems

      Po-Cheng Chen, Prathik Roy, Li-Yi Chen, Rini Ravindranath and Huan-Tsung Chang

      Article first published online: 12 MAY 2014 | DOI: 10.1002/ppsc.201400043

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      Gold (Au) and silver (Ag) nanomaterial (NM)-based colorimetric and fluorescence probes are sensitive and selective for a wide range of analytes, including metal ions, anions, small molecules, protein, and DNA.

  12. Full Papers

    1. Magnetoadsorptive Particles Enabling the Centrifugation-Free, Preparative-Scale Separation, and Sorting of Single-Walled Carbon Nanotubes

      Thomas P. McNicholas, Victor Cantu, Andrew J. Hilmer, Kevin Tvrdy, Rishabh Jain, Rebecca Han, Darin Bellisario, Jiyoung Ahn, Paul W. Barone, Bin Mu and Michael S. Strano

      Article first published online: 11 MAY 2014 | DOI: 10.1002/ppsc.201400072

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      A hybrid material composed of a polymer decorated with superparamagnetic magnetite nanoparticles is successfully synthesized and applied to the simple and easily scalable separation of semiconducting and metallic single-walled carbon nanotubes (s-SWNT and m-SWNT) from as-prepared, uncentrifuged, and unpurified stocks.

  13. Communications

    1. Tunability in Crystallinity and Magnetic Properties of Core–Shell Fe Nanoparticles

      Gurvinder Singh, Puri Anil Kumar, Christopher Lundgren, Antonius T. J. van Helvoort, Roland Mathieu, Erik Wahlström and Wilhelm R. Glomm

      Article first published online: 11 MAY 2014 | DOI: 10.1002/ppsc.201400032

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      Monodisperse iron nanoparticles of size range 519 nm with controlled crystallinity and magnetic properties are synthesized via thermal decomposition of iron pentacarbonyl in the presence of an appropriate ligand. Crystalline body-centered cubic iron nanoparticles synthesized in the presence of didodecyldimethylammonium bromide exhibit a high saturation magnetization and room temperature ferromagnetic behavior with a remarkable increased stability in the aqueous phase in comparison to amorphous nanoparticles synthesized in the presence of other ligands.

    2. Diamondosomes: Submicron Colloidosomes with Nanodiamond Shells

      Michael Maas, Tobias Bollhorst, Richard N. Zare and Kurosch Rezwan

      Article first published online: 6 MAY 2014 | DOI: 10.1002/ppsc.201400022

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      A novel class of submicron colloidosomes has been assembled from nanodiamonds. These capsules, which we call diamondosomes, are self-assembled from either negatively or positively charged detonation nanodiamonds at a decane/water interface using lipids to induce shell formation. Diamondosomes show high shell stability as analyzed by interfacial shear rheology and offer the promise of serving as multifunctional drug delivery vesicles.

    3. Au Islet Decoration and Coupling on Chalcogenide Substrates for Near-Infrared and Short-Wave Infrared Optical Responses

      Joseph K. Young, Ariel V. Nixon, Arthi Satyanarayan and Rebekah A. Drezek

      Article first published online: 28 APR 2014 | DOI: 10.1002/ppsc.201400007

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      A novel NIR and SWIR optically responsive nanostructured complex in the form of a Au isleted chalcogenide substrate is reported. The optical response is directly related to the plasmonic coupling islets that decorate the surface of the chalcogenide substrate and environmental refractive index dynamics due to the inclusion of the substrate.

  14. Full Papers

    1. A Simple Strategy to Prepare Colloidal Cu-Doped ZnSe(S) Green Emitter Nanocrystals in Aqueous Media

      Lívia C. de S. Viol, Ellen Raphael, Jefferson Bettini, Jefferson L. Ferrari and Marco A. Schiavon

      Article first published online: 28 APR 2014 | DOI: 10.1002/ppsc.201300376

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      A novel and simple method is described for preparing colloidal Cu-doped ZnSe(S) quantum dots in aqueous media by introducing copper ions using the same method as to prepare colloidal ZnSe(S). The excellent stability observed for the nanoparticles overcomes the intrinsic instability of traditional aqueous Cu-doped ZnSe(S) nanocrystals.

  15. 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).

  16. 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.

  17. 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.

  18. 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.

  19. 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.

  20. 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).

  21. 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.

  22. 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.

  23. 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.

  24. 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.

  25. 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

      Thumbnail image of graphical abstract

      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.

  26. 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

      Thumbnail image of graphical abstract

      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

      Thumbnail image of graphical abstract

      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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