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Particle-impact analysis of the degree of cluster formation of rutile nanoparticles in aqueous solution. | LitMetric

Particle-impact analysis of the degree of cluster formation of rutile nanoparticles in aqueous solution.

Phys Chem Chem Phys

Department of Chemistry, Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, UK.

Published: February 2017

AI Article Synopsis

  • - Cluster formation significantly affects how nanoparticles behave in natural water systems, influencing their bioavailability and chemical activity.
  • - Traditional methods for analyzing nanoparticles often require dilution, which can distort measurements of cluster size; therefore, a new in situ approach is necessary.
  • - This study uses particle impact chronoamperometry to assess the clustering of modified rutile nanoparticles, revealing that they tend to form larger clusters than previously thought, with about 91 particles per cluster, emphasizing the limitations of dilution in nanoparticle studies.

Article Abstract

Cluster formation can profoundly influence the bioavailability and (bio)geochemical activity of nanoparticles in natural aquatic systems. While colloidal properties of nanoparticles are commonly investigated using light-scattering techniques, the requirement to dilute samples can affect the fundamental nature and extent of the cluster size. Hence, an alternative in situ approach that can cover a much higher and wider concentration range of particles is desirable. In this study, particle impact chronoamperometry is employed to probe the degree of cluster formation of Alizarin Red S modified rutile nanoparticles of diameter ca. 167 nm in conditions approximating those existing in the environment. Random collisions of individual clusters of the modified rutile particles with a stationary electrode result in transient current signals during a chronoamperometric measurement, indicative of the reduction of the adsorbed Alizarin Red S dye molecules. The results from the particle-impact analysis reveal that the nanoparticles are heavily clustered with an average 91 monomeric particles per cluster. As the spherical equivalent size of the clusters (ca. 754 nm in diameter) is considerably larger than that from nanoparticle tracking analysis (ca. 117 nm), the present work highlights the impact of the dilution on the fundamental nature of the colloidal suspension and introduces the electrochemical determination of the size distribution of inert mineral nanoparticles in highly concentrated media.

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Source
http://dx.doi.org/10.1039/c6cp08531hDOI Listing

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