Direct electrochemical detection and sizing of silver nanoparticles in seawater media

Stuart, Emma J. E.; Rees, Neil V.; Cullen, Jay T.; Compton, Richard G.

doi:10.1039/c2nr33146b

Cited by 92 publications

(84 citation statements)

References 18 publications

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“…4−6 Typically, Ag NPs are expected to have a low environmental persistence, as dissolution or agglomeration/aggregation and subsequent sedimentation is assumed to occur on relatively short time scales. 7 However, recent successful efforts to stabilize NPs in complex suspensions, especially those of high ionic strength, such as cell environments, 8 seawater, 9 blood, 10 and stomach acid, 11 will result in increased environmental persistence and a greater opportunity for the uptake of nanosilver into biological systems. The stability of the NP is governed largely by the choice of the capping agent, 12 which is added to prevent aggregation and agglomeration of the nanoparticles.…”

Section: ■ Introductionmentioning

confidence: 99%

“…9 A recent publication by Toh et al 17 observed reactivity differences of NPs in water, but no new insight into the dynamics of the different capping agents in that aqueous medium was gained. To examine the effect of the capping agent on the particle−solution dynamics, extending existing approaches to examine NPs in an entirely different, high-ionic strength solvent such as room-temperature ionic liquids (RTILs) is highly advantageous.…”

Section: ■ Introductionmentioning

confidence: 99%

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Nanoparticle Capping Agent Dynamics and Electron Transfer: Polymer-Gated Oxidation of Silver Nanoparticles

et al. 2015

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Capping agent-controlled stability of nanoparticles tailors them for different applications, but the associated particle−solvent dynamics are poorly understood. Herein, previously unseen capping agent-gated nanoparticle redox activity is observed for poly(ethylene glycol)-coated silver nanoparticles. This is revealed by stochastic nanoparticle stripping, probing one individual nanoparticle at a time, from an ensemble of surface-immobilized nanoparticles. Thus, new and previously inaccessible understanding is gained on the crucial role of capping agent dynamics on nanoparticle reactivity.

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Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Nanoparticle Capping Agent Dynamics and Electron Transfer: Polymer-Gated Oxidation of Silver Nanoparticles

et al. 2015

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“…The collisions of these particulates with an electrode at a positive potential bias 15 have resulted in spikes from impact electrochemistry. These electrochemical signals find their origins from the electrochemical oxidation reactions that occur.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Remote Electrochemical Monitoring of an Autonomous Self-Propelled Capsule

2014

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While self-propelled autonomous devices have witnessed dramatic developments in recent years, the systems monitoring their movement have not kept up and continue to rely on optical tracking, which is difficult to automate and requires large processing power for analysis of recorded movies. Optical systems are also limited by transparency of the media/system and are constrained by the depth and field of view. A system that obviates these inherent limitations of optical tracking is urgently needed. Here, the remote monitoring by an electrochemical method is presented. It demonstrates efficacy in the determination of the location of an autonomous self-propelled capsule in continuous motion regardless of transparency or optical limitations. The "cognitive" ability of the capsule to survey positions of obstacles is also illustrated. This novel method allows for the mapping of self-propelled motors and their surroundings, via the transmission of real-time information, in a channel environment. Such a system provides a break-through of monitoring limitations and allows for truly autonomous systems.

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“…The same authors have studied the evolution of silver nanoparticles in seawater using Ag NP standards and they found that silver nanoparticles were aggregated in this media over the time scale of the measurements [207]. To date, applications involve metallic nanoparticles and anodic PCC, whereas cathodic PCC has just been used for the characterization of pristine nanomaterials, like magnetic nanoparticles of Fe 3 O 4 [208].…”

Section: By Using Vip Size and Mass Concentration Of Silver Nanopartmentioning

confidence: 99%

Detection, characterization and quantification of inorganic engineered nanomaterials: A review of techniques and methodological approaches for the analysis of complex samples

Laborda

Bolea

Cepriá

et al. 2016

Analytica Chimica Acta

331

170

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The increasing demand of analytical information related to inorganic engineered nanomaterials requires the adaptation of existing techniques and methods, or the development of new ones.The challenge for the analytical sciences has been to consider the nanoparticles as a new sort of analytes, involving both chemical (composition, mass and number concentration) and physical information (e.g. size, shape, aggregation). Moreover, information about the species derived from the nanoparticles themselves and their transformations must also be supplied. Whereas techniques commonly used for nanoparticle characterization, such as light scattering techniques, show serious limitations when applied to complex samples, other well-established techniques, like electron microscopy and atomic spectrometry, can provide useful information in most cases. Furthermore, separation techniques, including flow field flow fractionation, capillary electrophoresis and hydrodynamic chromatography, are moving to the nano domain, mostly hyphenated to inductively coupled plasma mass spectrometry as element specific detector.Emerging techniques based on the detection of single nanoparticles by using ICP-MS, but also coulometry, are in their way to gain a position. Chemical sensors selective to nanoparticles are in their early stages, but they are very promising considering their portability and simplicity.Although the field is in continuous evolution, at this moment it is moving from proofs-of-2 concept in simple matrices to methods dealing with matrices of higher complexity and relevant analyte concentrations. To achieve this goal, sample preparation methods are essential to manage such complex situations. Apart from size fractionation methods, matrix digestion, extraction and concentration methods capable of preserving the nature of the nanoparticles are being developed. This review presents and discusses the state-of-the-art analytical techniques and sample preparation methods suitable for dealing with complex samples. Single-and multimethod approaches applied to solve the nanometrological challenges posed by a variety of stakeholders are also presented.

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Direct electrochemical detection and sizing of silver nanoparticles in seawater media

Cited by 92 publications

References 18 publications

Nanoparticle Capping Agent Dynamics and Electron Transfer: Polymer-Gated Oxidation of Silver Nanoparticles

Nanoparticle Capping Agent Dynamics and Electron Transfer: Polymer-Gated Oxidation of Silver Nanoparticles

Remote Electrochemical Monitoring of an Autonomous Self-Propelled Capsule

Detection, characterization and quantification of inorganic engineered nanomaterials: A review of techniques and methodological approaches for the analysis of complex samples

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