Accéder au contenu
Merck

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
PMID25000117
RÉSUMÉ

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.

MATÉRIAUX
Référence du produit
Marque
Description du produit
27109
Sigma-Aldrich
Acide citrique, meets analytical specification of Ph. Eur., BP, USP, E330, anhydrous, 99.5-100.5% (based on anhydrous substance)
PVP360
Sigma-Aldrich
Polyvinylpyrrolidone, mol wt (number average molecular weight Mn 360kDa)
718467
Sigma-Aldrich
Oxyde de titane(IV), nanopowder, 21 nm primary particle size (TEM), ≥99.5% trace metals basis
437190
Sigma-Aldrich
Polyvinylpyrrolidone, average Mw ~1,300,000 by LS
637254
Sigma-Aldrich
Oxyde de titane(IV), anatase, nanopowder, <25 nm particle size, 99.7% trace metals basis
PVP40
Sigma-Aldrich
Polyvinylpyrrolidone, average mol wt 40,000
856568
Sigma-Aldrich
Polyvinylpyrrolidone, powder, average Mw ~55,000
735825
Sigma-Aldrich
Silver, conductive paste
232033
Sigma-Aldrich
Oxyde de titane(IV), anatase, powder, 99.8% trace metals basis
14021
Sigma-Aldrich
Oxyde de titane(IV), ReagentPlus®, ≥99%
251275
Sigma-Aldrich
Acide citrique, ACS reagent, ≥99.5%
234257
Sigma-Aldrich
Polyvinylpyrrolidone, powder, average Mw ~29,000
224227
Sigma-Aldrich
Titanium(IV) oxide, rutile, powder, <5 μm, ≥99.9% trace metals basis
P0930
Sigma-Aldrich
Polyvinylpyrrolidone, powder, BioXtra, suitable for mouse embryo cell culture
W230618
Sigma-Aldrich
Acide citrique, ≥99.5%, FCC, FG
248576
Sigma-Aldrich
Oxyde de titane(IV), anatase, powder, −325 mesh, ≥99% trace metals basis
C2404
Sigma-Aldrich
Acide citrique, anhydrous, suitable for cell culture, suitable for plant cell culture
637262
Sigma-Aldrich
Titanium(IV) oxide, rutile, nanopowder, <100 nm particle size, 99.5% trace metals basis
1134368
USP
Acide citrique, United States Pharmacopeia (USP) Reference Standard
634662
Sigma-Aldrich
Titanium(IV) oxide, mixture of rutile and anatase, nanopowder, <100 nm particle size (BET), 99.5% trace metals basis
27487
Sigma-Aldrich
Acide citrique, BioUltra, anhydrous, ≥99.5% (T)
C0759
Sigma-Aldrich
Acide citrique, 99%
348791
Sigma-Aldrich
Titanium, foil, thickness 0.127 mm, 99.7% trace metals basis
81420
Sigma-Aldrich
Polyvinylpyrrolidone, K 30
366994
Sigma-Aldrich
Titanium, powder, <45 μm avg. part. size, 99.98% trace metals basis
739421
Sigma-Aldrich
Silver nanowires, diam. × L 50 nm × 6 μm, 0.5% (isopropyl alcohol suspension)
267503
Sigma-Aldrich
Titanium, foil, thickness 0.25 mm, 99.7% trace metals basis
700347
Sigma-Aldrich
Titanium(IV) oxide, mixture of rutile and anatase, nanoparticles, <150 nm particle size (volume distribution, DLS), dispersion, 40 wt. % in H2O, 99.5% trace metals basis
PVP10
Sigma-Aldrich
Polyvinylpyrrolidone, average mol wt 10,000
02286
Sigma-Aldrich
Polyvinylpyrrolidone