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Zeta Potential for Metal Oxide Nanoparticles: A Predictive Model Developed by a Nano-Quantitative Structure–Property Relationship Approach

20-Mar-2015 | Alicja Mikolajczyk; Agnieszka Gajewicz; Bakhtiyor Rasulev; Nicole Schaeublin; Elisabeth Maurer-Gardner; Saber Hussai ..., Chemistry of Materials, 2015

Physico–chemical characterization of nanoparticles in the context of their transport and fate in the environment is an important challenge for risk assessment of nanomaterials. One of the main characteristics that defines the behavior of nanoparticles in solution is zeta potential (ζ). In this ...

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Large-Scale Fabrication and Application of Magnetite Coated Ag NWs-Core Water-Dispersible Hybrid Nanomaterials

18-Mar-2015 | baoyu wang; Min Zhang; weizhen li; Linlin Wang; Jing Zheng; Wenjun Gan; Jingli Xu, Dalton Transactions, 2015

In this work, we report a large scale synthetic procedure that allows attachment of magnetite nanoparticles onto the Ag NWs in situ, which was conducted in triethylene glycol (TREG) solution with iron acetylacetonate and Ag NWs as starting materials. The as-prepared Ag NWs/Fe3O4 NPs composites ...

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Device for dielectrophoretic separation and collection of nanoparticles and DNA under high conductance conditions

17-Mar-2015 | Youngjun Song, Avery Sonnenberg, Yvonne Heaney, Michael J. Heller, ELECTROPHORESIS, 2015

Most dielectrophoretic (DEP) separations of cells, nanoparticles and other entities are carried out on microelectrode arrays or in microfluidic device formats. Less work has been directed at designing pipette type formats that would allow dipping into and recovering specific analytes from ...

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Proton Dynamics on Goethite Nanoparticles and Coupling to Electron Transport

17-Mar-2015 | Piotr Zarzycki; Dayle M. Smith; Kevin M. Rosso, Journal of Chemical Theory and Computation, 2015

The surface chemistry of metal oxide particles is governed by the charge that develops at the interface with aqueous solution. Mineral transformation, biogeochemical reactions, remediation, and sorption dynamics are profoundly affected in response. Here we report implementation of ...

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Enzyme Induced Formation of Monodisperse Hydrogel Nanoparticles Tunable in Size

17-Mar-2015 | Vera Bocharova; Danna Sharp; Aaron Jones; Shiwang Cheng; Philip J. Griffin; Alexander L. Agapov; Dmitry Voylov; Yang ..., Chemistry of Materials, 2015

We report a novel approach to synthesize monodisperse hydrogel nanoparticles that are tunable in size. The distinctive feature of our approach is the use of a multicopper oxidase enzyme, laccase, as both a biocatalyst and template for nanoparticle growth. We utilize the ferroxidase activity of ...

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Nitric Oxide Reduction to Ammonia by TiO2 Electrons in Colloid Solution via Consecutive One-Electron Transfer Steps

16-Mar-2015 | Sara Goldstein; David Behar; Tijana Rajh; Joseph Rabani, Journal of Physical Chemistry A, 2015

The reaction mechanism of nitric oxide (NO) reduction by excess electrons on TiO2 nanoparticles (eTiO2–) has been studied under anaerobic conditions. TiO2 was loaded with 10–130 electrons per particle using γ-irradiation of acidic TiO2 colloid solutions containing 2-propanol. The study is based ...

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Controlled Synthesis of Fe3O4/ZIF‐8 Nanoparticles for Magnetically Separable Nanocatalysts

12-Mar-2015 | Fei Pang, Mingyuan He, Jianping Ge, Chemistry - A European Journal, 2015

Abstract Fe3O4/ZIF‐8 nanoparticles were synthesized through a room‐temperature reaction between 2‐methylimidazolate and zinc nitrate in the presence of Fe3O4 nanocrystals. The particle size, surface charge, and magnetic loading can be conveniently controlled by the dosage of Zn(NO3)2 and Fe3O4 ...

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Facile fabrication of metal oxide hollow spheres using polydopamine nanoparticles as active templates

11-Mar-2015 | Heng Shen, Yuhua Long, Xiaoli Yang, Ning Zhao, Jian Xu, Polymer International, 2015

Abstract In this research, a facile method offabricatingmetal oxide hollow spheresusing polydopamine (PDA) nanoparticles as active templates is reported. Monodisperse PDA nanoparticles were prepared by thepolymerization of dopamine in Trisbuffer solution containing different amount of ...

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Coating Effects of Orange and Pomegranate Peel Extracts Combined with Chitosan Nanoparticles on the Quality of Refrigerated Silver Carp Fillets

11-Mar-2015 | Mehdi Zarei, Zahra Ramezani, Shekufeh Ein‐Tavasoly, Milad Chadorbaf, Journal of Food Processing and Preservation, 2015

Abstract The coating effects of orange and pomegranate peel extract combined with chitosan nanoparticles on the quality of silver carp (Hypophthalmicthys molitrix) fillets during refrigerated storage at 4C were evaluated. Solutions of orange and pomegranate peel extracts (1%, w/v) was used ...

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NMR Techniques for Noble Metal Nanoparticles

11-Mar-2015 | Lauren E. Marbella; Jill E. Millstone, Chemistry of Materials, 2015

Solution phase noble metal nanoparticle growth reactions are comprised of deceptively simple steps. Analytical methods with high chemical, spatial, and temporal resolution are crucial to understanding these reactions and subsequent nanoparticle properties. However, approaches for the ...

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