A systematic evaluation of agglomeration of Ag and TiO2 nanoparticles under freshwater relevant conditions.

A systematic evaluation of agglomeration of Ag and TiO2 nanoparticles under freshwater relevant conditions.

Environmental pollution (Barking, Essex : 1987) (2014-07-08)

Emel Topuz, Laura Sigg, Ilhan Talinli

摘要

This study aims to investigate effects of freshwater components in order to predict agglomeration behavior of silver nanoparticles coated with citrate (AgNP-Cit), polyvinylpyrrolidone (AgNP-PVP), and of TiO2 nanoparticles. Agglomeration studies were conducted in various media based on combinations of ions, natural organic matter (humic, fulvic acid) and surfactants (sodium dodecyl sulfate, alkyl ethoxylate), at a constant ionic strength of 10 mM over time for up to 1 week. Agglomeration level of AgNP-Cit and TiO2 was mostly dependent on the concentration of Ca(2+) in media, and their size strongly increased to micrometer scale over 1 week. However, AgNP-Cit and TiO2 were stabilized to particle size around 500 nm in the presence of NOM, surfactants and carbonate over 1 week. AgNP-PVP maintained their original size in all media except in the presence of Mg(2+) ions which led to significant agglomeration. Behavior of these engineered nanoparticles was similar in a natural freshwater medium.

材料

货号

品牌

产品描述

27109

Sigma-Aldrich

无水柠檬酸粉末, meets analytical specification of Ph. Eur., BP, USP, E330, anhydrous, 99.5-100.5% (based on anhydrous substance)

PVP360

Sigma-Aldrich

聚乙烯吡咯烷酮, mol wt (number average molecular weight Mn 360kDa)

718467

Sigma-Aldrich

氧化钛（IV）, nanopowder, 21 nm primary particle size (TEM), ≥99.5% trace metals basis

437190

Sigma-Aldrich

聚乙烯吡咯烷酮, average M_w ~1,300,000 by LS

637254

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氧化钛 (IV)，锐钛矿, nanopowder, <25 nm particle size, 99.7% trace metals basis

PVP40

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聚乙烯吡咯烷酮, average mol wt 40,000

856568

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聚乙烯吡咯烷酮, powder, average M_w ~55,000

735825

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银, conductive paste

14027

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氧化钛（IV）, puriss., meets analytical specification of Ph. Eur., BP, USP, 99-100.5%

232033

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氧化钛 (IV)，锐钛矿, powder, 99.8% trace metals basis

14021

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氧化钛（IV）, ReagentPlus^®, ≥99%

251275

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无水柠檬酸粉末, ACS reagent, ≥99.5%

234257

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聚乙烯吡咯烷酮, powder, average M_w ~29,000

224227

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P0930

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聚乙烯吡咯烷酮, powder, BioXtra, suitable for mouse embryo cell culture

248576

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氧化钛 (IV)，锐钛矿, powder, −325 mesh, ≥99% trace metals basis

C2404

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无水柠檬酸粉末, anhydrous, suitable for cell culture, suitable for plant cell culture

637262

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钛 (IV) 氧化物，金红石型, nanopowder, <100 nm particle size, 99.5% trace metals basis

1134368

USP

无水柠檬酸粉末, United States Pharmacopeia (USP) Reference Standard

634662

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27487

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无水柠檬酸粉末, BioUltra, anhydrous, ≥99.5% (T)

C0759

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81420

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366994

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739421

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银纳米线悬浮液, diam. × L 50 nm × 6 μm, 0.5% (isopropyl alcohol suspension)

267503

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700347

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02286

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Kollidon ^® 25