Interlaboratory comparison for the measurement of particle size and zeta potential of silica nanoparticles in an aqueous suspension

Lamberty, A.; Franks, Katrin; Adelina, Braun; Kestens, Vikram; Roebben, Gert; Linsinger, Thomas P. J.

doi:10.1007/s11051-011-0624-4

Cited by 44 publications

(32 citation statements)

References 8 publications

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“…The agreement with alternative methods is excellent with 1 nm deviation for the larger species, where the relative contribution of the citrate stabilization layer to the total hydrodynamic diameter is negligible. The same effect was found in a round robin on SiO 2 certification (Lamberty et al 2011). An important asset of AUC is the measurement of the sizes in the mixture, where we find to less than 1 nm deviation for each fraction the same diameters as for the individual samples (Fig.…”

Section: Results On Classification Of Nanomaterialssupporting

confidence: 72%

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Validity range of centrifuges for the regulation of nanomaterials: from classification to as-tested coronas

Wohlleben

2012

J Nanopart Res

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Granulometry is the regulatory category where the differences between traditional materials and nanomaterials culminate. Reported herein is a careful validation of methods for the quantification of dispersability and size distribution in relevant media, and for the classification according to the EC nanodefinition recommendation. Suspension-based techniques can assess the nanodefinition only if the material in question is reasonably well dispersed. Using dispersed material of several chemical compositions (organic, metal, metal-oxide) as test cases we benchmark analytical ultracentrifugation (AUC), dynamic light scattering (DLS), hydrodynamic chromatography, nanoparticle tracking analysis (NTA) against the known content of bimodal suspensions in the commercially relevant range between 20 nm and a few microns. The results validate fractionating techniques, especially AUC, which successfully identifies any dispersed nanoparticle content from 14 to 99.9 nb% with less than 5 nb% deviation. In contrast, our screening casts severe doubt over the reliability of ensemble (scattering) techniques and highlights the potential of NTA to develop into a counting upgrade of DLS. The unique asset of centrifuges with interference, X-ray or absorption detectors—to quantify the dispersed solid content for each size interval from proteins over individualized nanoparticles up to agglomerates, while accounting for their loose packing—addresses also the adsorption/depletion of proteins and (de-)agglomeration of nanomaterials under cell culture conditions as tested for toxicological endpoints.

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Section: Results On Classification Of Nanomaterialssupporting

confidence: 72%

“…Both were recently benchmarked for their accuracy with a round robin on monomodal nanomaterials (Lamberty et al 2011). For our present investigations on multimodal distributions, NIST-traceable polymer bead standards were mixed as bimodal distributions.…”

Section: Results On Classification Of Nanomaterialsmentioning

confidence: 99%

Validity range of centrifuges for the regulation of nanomaterials: from classification to as-tested coronas

Wohlleben

2012

J Nanopart Res

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“…The data were gathered from two different batches of commercially available silica dispersion. The first batch (sample B) was supplied by IRMM and the measurements were performed as part of an inter-laboratory comparison [27]. This sample was characterized using ES-SMPS, NTA, DLS, and TEM.…”

Section: Introductionmentioning

confidence: 99%

Intermethod comparison of the particle size distributions of colloidal silica nanoparticles

Tuoriniemi

Johnsson

Holmberg

et al. 2014

Science and Technology of Advanced Materials

104

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There can be a large variation in the measured diameter of nanoparticles depending on which method is used. In this work, we have strived to accurately determine the mean particle diameter of 30–40 nm colloidal silica particles by using six different techniques. A quantitative agreement between the particle size distributions was obtained by scanning electron microscopy (SEM), and electrospray-scanning mobility particle sizer (ES-SMPS). However, transmission electron microscopy gave a distribution shifted to smaller sizes. After confirming that the magnification calibration was consistent, this was attributed to sample preparation artifacts. The hydrodynamic diameter, d h, was determined by dynamic light scattering (DLS) both in batch mode, and hyphenated with sedimentation field flow fractionation. Surprisingly the d h were smaller than the SEM, and ES-SMPS diameters. A plausible explanation for the smaller sizes found with DLS is that a permeable gel layer forms on the particle surface. Results from nanoparticle tracking analysis were strongly biased towards larger diameters, most likely because the silica particles provide low refractive index contrast. Calculations confirmed that the sensitivity is, depending on the shape of the laser beam, strongly size dependent for particles with diameters close to the visualization limit.

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“…The EC (electrical . 0 (1) where, I and EC are the ionic strength and electrical conductivity, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The amount of these materials released into the environment is continuously increasing. Thus, growing attention from different regulatory agencies interested in minimizing the environmental impact of these novel materials are observed [1]. To assess the risk, it is necessary to consider the likelihood of exposure to engineered nanoparticles through aqueous media, as it is a receptacle to these materials during their life cycle [2].…”

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confidence: 99%

Analysis of Percolation of the Stabilized Suspensions of TiO2 and SiO2 Nanoparticles in Soil Columns Simulating Landfill Layers

Oliveira¹,

Nogueira²,

Lopes³

et al. 2016

JMEA

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Abstract:It studied the behavior of transport and stability of TiO 2 and SiO 2 nanoparticles suspensions percolating through soil columns aiming at simulating municipal waste landfills covering soil layers performance. Experimental columns were constructed with landfill soils and water suspensions with nanoparticles percolation runs were carried out. The experimental columns were constructed with 100 mm and 200 mm of diameter and height, respectively. Outlet concentrations were measured along the percolation time using ICP-OES and nanoparticles tracking analyzer. It was observed that SiO 2 nanoparticles acts as a stabilizer of TiO 2 nanoparticles suspensions and promotes its transport through the soil columns, which simulates the conditions of the controlled landfills layers. The interaction of the suspensions of SiO 2 nanoparticles with nanoparticles of TiO 2 , promote a high stability of the emulsions, which confers the high zeta potential present in SiO2 suspensions, promoting greater mobility and transport through the soil columns. The experimental results demonstrated that TiO 2 nanoparticles were kept suspended, even after 10 days, which indicates good stability. It was observed that both TiO 2 and SiO 2 were kept in suspensions with negligible nanoparticles clustering and decantation. It was confirmed that the TiO 2 and SiO 2 of the outflow of soil columns are strongly affected by the soil pH, organic carbon and clay content of the soils. It was observed that the soil columns behave as a retention barrier for both TiO 2 and SiO 2 nanoparticles.

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Interlaboratory comparison for the measurement of particle size and zeta potential of silica nanoparticles in an aqueous suspension

Cited by 44 publications

References 8 publications

Validity range of centrifuges for the regulation of nanomaterials: from classification to as-tested coronas

Validity range of centrifuges for the regulation of nanomaterials: from classification to as-tested coronas

Intermethod comparison of the particle size distributions of colloidal silica nanoparticles

Analysis of Percolation of the Stabilized Suspensions of TiO2 and SiO2 Nanoparticles in Soil Columns Simulating Landfill Layers

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