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The effect of nanoparticle concentration on zeta-potential measurement results and reproducibility.

Tantra, R; Schulze, P; Quincey, P (2010) The effect of nanoparticle concentration on zeta-potential measurement results and reproducibility. Particuology, 8 (3). pp. 279-285.

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Abstract

The effect of nanoparticle concentration on measurements of zeta-potential, at dilute concentrations, was evaluated. Zeta-potential values for four different types of nanoparticles [Ludox (silica), multiwalled carbon nanotubes [bamboo-shaped and hollow nanotubes] and gold], at various concentrations, were acquired using a laser Doppler electrophoresis instrument; each measurement was replicated six times. The corresponding size measurement upon dilution was acquired using dynamic light scattering technology to provide additional information. Results show that there is a concentration range in which the zeta-potential is not affected by nanoparticle concentration. However, the stability of the system was reduced dramatically under conditions of high dilution, in which the zeta-potential shifted to less negative values. This is accompanied by the onset of aggregation of the nanoparticles, made evident by an increase in the mean particle size measured as well as an increase in irreproducibility of replicate size measurement. Sources of irreproducibility for zeta-potential measurements were mainly attributed to the combined effects of: a) changes in the sample under the influence of high applied potential [electrophoretic conditions] and b) the detection capability of the instrument to measure reliably at such low particle concentration.

Item Type: Article
Keywords: Nanoparticles, zeta-potential, dynamic light scattering, reproducibility
Subjects: Nanoscience
Nanoscience > Surface and Nanoanalysis
Last Modified: 02 Feb 2018 13:15
URI: http://eprintspublications.npl.co.uk/id/eprint/4662

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