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Effect of Laundry Surfactants on Surface Charge and Colloidal Stability of Silver Nanoparticles
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.ORCID iD: 0000-0002-5263-6487
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science. KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.ORCID iD: 0000-0003-2100-8864
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.ORCID iD: 0000-0001-7496-1101
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2013 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 29, no 28, 8882-8891 p.Article in journal (Refereed) Published
Abstract [en]

The stability of silver nanoparticles (Ag NPs) potentially released from clothing during a laundry cycle and their interactions with laundry-relevant surfactants [anionic (LAS), cationic (DTAC), and nonionic (Berol)] have been investigated. Surface interactions between Ag NPs and surfactants influence their speciation and stability. In the absence of surfactants as well as in the presence of LAS, the negatively charged Ag NPs were stable in solution for more than 1 day. At low DTAC concentrations (<= 1 mM), DTAC-Ag NP interactions resulted in charge neutralization and formation of agglomerates. The surface charge of the particles became positive at higher concentrations due to a bilayer type formation of DTAC that prevents from agglomeration due to repulsive electrostatic forces between the positively charged colloids. The adsorption of Berol was enhanced when above its critical micelle concentration (cmc). This resulted in a surface charge dose to zero and subsequent agglomeration. Extended DLVO theory calculations were in compliance with observed findings. The stability of the Ag NPs was shown to depend on the charge and concentration of the adsorbed surfactants. Such knowledge is important as it may influence the subsequent transport of Ag NPs through different chemical transients and thus their potential bioavailability and toxicity.

Place, publisher, year, edition, pages
2013. Vol. 29, no 28, 8882-8891 p.
Keyword [en]
Water, Aggregation, Adsorption, Kinetics, Release, Dissolution, Scattering, Interface, Toxicity, Impact
National Category
Other Chemistry Topics
Identifiers
URN: urn:nbn:se:kth:diva-127770DOI: 10.1021/la4012873ISI: 000322059700014Scopus ID: 2-s2.0-84880317169OAI: oai:DiVA.org:kth-127770DiVA: diva2:646046
Funder
Swedish Research CouncilFormas
Note

QC 20130906

Available from: 2013-09-06 Created: 2013-09-05 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Surface reactivity of metal nanoparticles: - importance of surface active agents and biomolecules from a transformation, mobility and toxicity perspective
Open this publication in new window or tab >>Surface reactivity of metal nanoparticles: - importance of surface active agents and biomolecules from a transformation, mobility and toxicity perspective
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Metallic nanoparticles possess unique properties due to their size and are widely used in e.g. consumer products. From this follows a need to identify and assess potential risks of human and environmental exposure. Their size facilitates uptake in organisms and disruption of various biological processes. Together with a high reactivity, mainly due to their large surface area in solution, they are both commonly used in different applications and of a potential safety concern. Risk assessment requires hence in-depth knowledge on the particle characteristics and their behavior in solution but also how these properties change with time and exposure conditions and whether these characteristics can be linked to toxicity following nanoparticle exposure. This thesis addresses these aspects with a main focus on metal nanoparticles and elaborates on the importance of characterization, how such measurements can be done, and on interactions with surfactants and biomolecules and toxic effects.Silver nanoparticles are, due to their antibacterial properties, often used in sportswear to prevent sweat odor. During laundry they may be dispersed and interact with surfactants of the washing powder, influencing their properties and stability in solution. These aspects are addressed in Papers I, III and V on silver nanoparticles of different size and surface coatings. The stability was shown to depend on the surface charge and the concentration of the surfactant. The stability and extent of silver release were reduced upon sequential exposure, indicating the importance of the particle history on their bioaccessibility, mobility and potential toxicity. A mechanism was proposed for how silver nanoparticles are stabilized in surfactant solutions.Toxic effects of silver nanoparticles of different size and coatings on cultivated lung cells, Paper II, and effects of copper-containing nanoparticles on different blood cells, Paper IV, were studied in vitro. The smallest particles were most cytotoxic and the “Trojan horse” mechanism played an important role, meaning that the nanoparticles facilitate cellular uptake followed by ion-release.Difficulties in the determination and interpretation of the zeta potential, related to the surface charge, of metal nanoparticles in complex solutions are elucidated in Paper VI. Guidelines are provided on how to accurately assess this property.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. 62 p.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2017:16
Keyword
metal nanoparticles, surfactants, metal release, characterization, size distribution, nanotoxicology, risk assessment
National Category
Chemical Sciences
Research subject
Chemistry
Identifiers
urn:nbn:se:kth:diva-199596 (URN)978-91-7729-247-0 (ISBN)
Public defence
2017-02-02, F3, Lindstedtsvägen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Funder
Swedish Research CouncilSwedish Research Council Formas
Note

QC 20170111

Available from: 2017-01-11 Created: 2017-01-10 Last updated: 2017-03-07Bibliographically approved

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Hedberg, JonasBlomberg, EvaOdnevall Wallinder, Inger

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