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

Content Provider	Royal Society of Chemistry (RSC)
Author	Young, Neil P. Compton, Richard G. Sokolov, Stanislav V. Shimizu, Kenichi
Copyright Year	2017
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.
Starting Page	3911
Ending Page	3921
Page Count	11
File Format	HTM / HTML PDF
ISSN	14639076
Volume Number	19
Issue Number	5
Journal	Physical Chemistry Chemical Physics
DOI	10.1039/c6cp08531h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Mineral Dye Electrode Nanoparticle tracking analysis Electrochemistry Bioavailability Chronoamperometry Alizarin Titanium dioxide
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Physical and Theoretical Chemistry

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