Chemical Transformations of Metal, Metal Oxide, and Metal Chalcogenide Nanoparticles in the Environment

Kuech, Thomas R.; Hamers, Robert J.; Pedersen, Joel A.

doi:10.1002/9781119275855.ch14

Cited by 10 publications

(27 citation statements)

References 213 publications

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“…This may be related to a higher affinity between cysteine and soluble Co ions, from which follows an increased complexation and hence driving force for dissolution. 55 As no significant differences in agglomerate size (PCCS) could be discerned for the Co NPs (10 mg/L) in PBS with and without cysteine (146 mg/L), differences in surface area do not play a significant role for the comparison of dissolution between different biomolecules. It should be noted that Table 1 does not include insoluble Co phosphates as they are missing from the JESS database.…”

Section: Resultsmentioning

confidence: 96%

Influence of Biocorona Formation on the Transformation and Dissolution of Cobalt Nanoparticles under Physiological Conditions

et al. 2019

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Cobalt (Co) nanoparticles (NPs) are produced in different applications and unintentionally generated at several occupational and traffic settings. Their diffuse dispersion may lead to interactions with humans and aquatic organisms via different exposure routes that include their transformation/dissolution in biological media. This paper has investigated the particle stability and reactivity of Co NPs (dispersed by sonication prior to exposure) interacting with selected individual biomolecules (amino acids, polypeptides, and proteins) in phosphate-buffered saline (PBS). No or minor adsorption of amino acids (glutamine, glutamic acid, lysine, and cysteine) was observed on the Co NPs, independent of the functional group and charge. Instead, phosphate adsorption resulted in the formation of a surface layer (a corona) of Co phosphate. The adsorption of larger biomolecules (polyglutamic acid, polylysine, lysozyme, and mucin) was evident in parallel with the formation of Co phosphate. The dissolution of the Co NPs was rapid as 35–55% of the particle mass was dissolved within the first hour of exposure. The larger biomolecules suppressed the dissolution initially compared to exposure in PBS only, whereas the dissolution was essentially unaffected by the presence of amino acids, with cysteine as an exception. The formation of Co phosphate on the NP surface reduced the protective properties of the surface oxide of the Co NPs, as seen from the increased levels of the released Co when compared with the nonphosphate-containing saline. The results underline the diversity of possible outcomes with respect to surface characteristics and dissolution of Co NPs in biological media and emphasize the importance of surface interactions with phosphate on the NP characteristics and reactivity.

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Section: Resultsmentioning

confidence: 96%

Influence of Biocorona Formation on the Transformation and Dissolution of Cobalt Nanoparticles under Physiological Conditions

et al. 2019

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“…4 ). This saturation can influence the release kinetics (Kuech et al 2016 ) and thus make them less comparable to the dissolution of both bare and PVP-capped Ag NPs.…”

Section: Resultsmentioning

confidence: 99%

“…The smaller particle size of the Ag NPs in the consumer products compared with the pristine can in general lead to faster dissolution rates (Kuech et al 2016 ). The agglomeration (Fig.…”

Section: Resultsmentioning

confidence: 99%

Transformation of silver nanoparticles released from skin cream and mouth spray in artificial sweat and saliva solutions: particle size, dissolution, and surface area

Hedberg

Eriksson

Kesraoui

et al. 2020

Environ Sci Pollut Res

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The use of silver nanoparticles (Ag NPs) in consumer products can result in diffuse environmental dispersion of both NPs and ionic silver. This study investigated the transformation of Ag NPs present in two consumer products (skin cream, mouth spray) in terms of release of Ag NPs and ionic silver and changes in particle size in artificial sweat and saliva solutions. Large differences in silver release were observed with the smaller sized Ag NPs in mouth spray releasing more silver compared with the Ag NPs of the skin cream. Substantial particle agglomeration took place in both artificial sweat and saliva, forming large-sized agglomerates (> 100 nm). The amount of dissolved silver in solution after 24 h was less than 10% of the total amount of Ag NPs for both products. The results show that the Ag NPs of these consumer products will largely remain as NPs even after 24 h of skin or saliva contact. The use of normalization by geometric surface area of the particles was tested as a way to compare dissolution for Ag NPs of different characteristics, including pristine, bare, as well as PVP-capped Ag NPs. Normalization of silver dissolution with the geometric surface area was shown promising, but more extensive studies are required to unambiguously conclude whether it is a way forward to enable grouping of the dissolution behavior of Ag NPs released from consumer products.

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“…Currently, a variety of inorganic compounds, such as MoS 2 , graphite, CuO, CuS, PbO, Fe 2 O 3 , and metallic powders, TiO 2 , clay, CaCO 3 , nanosilica, have been used as fillers to improve the tribological behavior, mechanical property, or both. 2,5,[9][10][11] Fibrous materials are also used for improving the properties of polymer matrix. 3,7,12 There is a significant challenge that is uniform dispersion of the metal fillers in polymer matrix.…”

Section: Introduction *mentioning

confidence: 99%

Preparation of polyamide 6/copper nanocomposites and its properties

Xu¹,

Zhang²,

He³

et al. 2019

Rev.Roum.Chim.

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Polyamide 6/copper (noted as PA6/Cu) nanocomposites was prepared readily where CuO was used as the filler and adipic acid as the catalyst. CuO was reduced to Cu elemental as well as dispersed in the polymerization system of PA6 via using the reducing atmosphere of the polymerization process. As-prepared PA6/Cu nanocomposites were characterized by means of differential scanning calorimetry (DSC), X-ray diffraction (XRD), ultraviolet-visible absorption spectroscopy (UV) and transmission electron microscopy (TEM). Results showed that CuO was reduced to Cu elemental, and evenly dispersed in PA6 matrix. The melting temperature of PA6 matrix material improved with increasing the content of Cu in comparison with pure PA6, however, the crystallization temperature tended to the low temperature. The crystal structure of PA6/Cu nanocomposites tended to generate γ crystal shape. Additionally, the size of as-fabricated nanoparticle was about 30-50 nm, and the ultraviolet absorption of 360 nm represented the absorption of Cu nanoparticles. The mechanical properties and friction behaviors of PA6/Cu nanocomposites were evaluated by means of universal tensile testing machine, impact testing machine, and friction testing machine. Results showed that as-prepared composites with 0.3% nano-Cu content possessed the best tensile strength of 27.75 MPa, as increased by 29.1% in comparison that of PA6. Furthermore, the impact toughness of PA6/Cu nanocomposites with nano-Cu content of 0.7% reached to 7.20 MPa, as increased by 170.5%. Friction coefficient and grinding spot diameter presented a decreasing tendency with increasing the nano-Cu content.

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Chemical Transformations of Metal, Metal Oxide, and Metal Chalcogenide Nanoparticles in the Environment

Cited by 10 publications

References 213 publications

Influence of Biocorona Formation on the Transformation and Dissolution of Cobalt Nanoparticles under Physiological Conditions

Influence of Biocorona Formation on the Transformation and Dissolution of Cobalt Nanoparticles under Physiological Conditions

Transformation of silver nanoparticles released from skin cream and mouth spray in artificial sweat and saliva solutions: particle size, dissolution, and surface area

Preparation of polyamide 6/copper nanocomposites and its properties

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