Assessing the colloidal properties of engineered nanoparticles in water: case studies from fullerene C60 nanoparticles and carbon nanotubes

Chen, Kai Loon; Smith, Billy; Ball, William P.; Fairbrother, D. Howard

doi:10.1071/en09112

Cited by 136 publications

(120 citation statements)

References 164 publications

(283 reference statements)

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“…A large quantity of literature is available on the influence of organic matter coatings on the behavior of ENM in natural systems, which directly affects the colloidal stability of ET-ENM in suspension [8]. Because natural organic matter (NOM) is a ubiquitous constituent of natural waters, these changes in the surface properties of PW-ENM and ET-ENM by NOM should be significant, for example, because they affect agglomeration of particles [1,41,42].…”

Section: Nanoparticle Releasementioning

confidence: 99%

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Potential scenarios for nanomaterial release and subsequent alteration in the environment

Nowack¹,

Ranville²,

Diamond³

et al. 2011

Enviro Toxic and Chemistry

533

353

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Abstract-The risks associated with exposure to engineered nanomaterials (ENM) will be determined in part by the processes that control their environmental fate and transformation. These processes act not only on ENM that might be released directly into the environment, but more importantly also on ENM in consumer products and those that have been released from the product. The environmental fate and transformation are likely to differ significantly for each of these cases. The ENM released from actual direct use or from nanomaterial-containing products are much more relevant for ecotoxicological studies and risk assessment than pristine ENM. Released ENM may have a greater or lesser environmental impact than the starting materials, depending on the transformation reactions and the material. Almost nothing is known about the environmental behavior and the effects of released and transformed ENM, although these are the materials that are actually present in the environment. Further research is needed to determine whether the release and transformation processes result in a similar or more diverse set of ENM and ultimately how this affects environmental behavior. This article addresses these questions, using four hypothetical case studies that cover a wide range of ENM, their direct use or product applications, and their likely fate in the environment. Furthermore, a more definitive classification scheme for ENM should be adopted that reflects their surface condition, which is a result of both industrial and environmental processes acting on the ENM. The authors conclude that it is not possible to assess the risks associated with the use of ENM by investigating only the pristine form of the ENM, without considering alterations and transformation processes. Environ. Toxicol. Chem. 2012;31:50-59. # 2011 SETAC

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Section: Nanoparticle Releasementioning

confidence: 99%

“…In addition, ENM are also affected by agglomeration or aggregation and settling [8]. The nature of the ENM surface will control aggregation, because all forms of ENM (pristine and altered) are subject to these processes.…”

Section: Introductionmentioning

confidence: 99%

Potential scenarios for nanomaterial release and subsequent alteration in the environment

Nowack¹,

Ranville²,

Diamond³

et al. 2011

Enviro Toxic and Chemistry

533

353

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“…Electrostatic interactions occur when the electrical double layers of NPs (and other colloids/surfaces) overlap [127]. Heteroaggregation may result from either weak electrostatic repulsion, attractive electrical fields from oppositely charged surfaces, and van der Waals forces, which tend to result in nonspecific spontaneous agglomeration [93,99,103,129,[134][135][136]. Heteroaggregation resulting from electrostatic interactions has been shown in NP-NP [99,127,136], NP-clay [128], NP-natural colloid [93,128,137,138], and NP-microorganism [107,108,116,117] interactions.…”

Section: Electrical Forcementioning

confidence: 99%

“…Heteroaggregation resulting from electrostatic interactions has been shown in NP-NP [99,127,136], NP-clay [128], NP-natural colloid [93,128,137,138], and NP-microorganism [107,108,116,117] interactions. Hetero(aggregation) due to suppression of electrostatic forces is typically influenced by a change in solution chemistry, and can in general be predicted by Derjaguin-Landau-VerweyOverbeek (DLVO) (or extended DLVO) theory [93,135,139]. Concentration of individual components that make up the aggregates is important since it determines the overall surface charge of the heteroaggregates [93].…”

Section: Electrical Forcementioning

confidence: 99%

Heteroaggregation of nanoparticles with biocolloids and geocolloids

Wang

Adeleye

Huang

et al. 2015

Advances in Colloid and Interface Science

170

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The application of nanoparticles has raised concern over the safety of these materials to human health and the ecosystem. After release into an aquatic environment, nanoparticles are likely to experience heteroaggregation with biocolloids, geocolloids, natural organic matter (NOM) and other types of nanoparticles. Heteroaggregation is of vital importance for determining the fate and transport of nanoparticles in aqueous phase and sediments. In this article, we review the typical cases of heteroaggregation between nanoparticles and biocolloids and/or geocolloids, mechanisms, modeling, and important indicators used to determine heteroaggregation in aqueous phase. The major mechanisms of heteroaggregation include electric force, bridging, hydrogen bonding, and chemical bonding. The modeling of heteroaggregation typically considers DLVO, X-DLVO, and fractal dimension. The major indicators for studying heteroaggregation of nanoparticles include surface charge measurements, size measurements, observation of morphology of particles and aggregates, and heteroaggregation rate determination. In the end, we summarize the research challenges and perspective for the heteroaggregation of nanoparticles, such as the determination of α hetero values and heteroaggregation rates; more accurate analytical methods instead of DLS for heteroaggregation measurements; sensitive analytical techniques to measure low concentrations of nanoparticles in heteroaggregation systems; appropriate characterization of NOM at the molecular level to understand the structures and fractionation of NOM; effects of different types, concentrations, and fractions of NOM on the heteroaggregation of nanoparticles; the quantitative adsorption and desorption of NOM onto the surface of nanoparticles and heteroaggregates; and a better understanding of the fundamental mechanisms and modeling of heteroaggregation in natural water which is a complex system containing NOM, nanoparticles, biocolloids and geocolloids.

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“…The Research Front begins with the Highlight by Arugete and Hochella, [8] which considers the important factors in microbial-NP interactions, including both microbe-and NPspecific factors. A Review by Chen [9] further considers the colloidal and surface chemistry of nanoparticles, focussing on carbon-based NMs and their implications. Aruguete et al then present research findings discussing quantum dot effects on single species bacterial strains.…”

Section: Jamie Lead Is Professor Of Environmental Nanoscience and Dirmentioning

confidence: 99%

Manufactured nanoparticles in the environment

Lead

2010

Environ. Chem.

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Environmental context. Nanotechnology is a very important industry which may be socially transformative, but produces nanomaterials (NMs) which have a potential but poorly characterised risk to the environment. This Research Front describes new research investigating NM environmental chemistry, particularly in relation to ecotoxicology. This Research Front shows some of the most exciting research undertaken currently and fits within a dynamic research program, which is global in scope and which attempts to unravel these complex areas.

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Assessing the colloidal properties of engineered nanoparticles in water: case studies from fullerene C60 nanoparticles and carbon nanotubes

Cited by 136 publications

References 164 publications

Potential scenarios for nanomaterial release and subsequent alteration in the environment

Potential scenarios for nanomaterial release and subsequent alteration in the environment

Heteroaggregation of nanoparticles with biocolloids and geocolloids

Manufactured nanoparticles in the environment

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