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Characterizing the dynamic behavior of nano-TiO2 agglomerates in suspensions by photocorrelation spectroscopy

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Abstract

Metal oxide nanoparticles are small but easily form agglomerates in suspension, depending on the strength of particle–particle and particle–media interactions. To understand the agglomeration behavior of nanoparticles in media and relate to it to product performance testing, measurement methods are desired to characterize highly scattering metal oxide nanoparticle suspensions without dilution. In this article, we describe the advantages of using photocorrelation spectroscopy (PCS) in a backscattering detection configuration to carry out a realistic agglomerate size measurement in multiple scattering media found in most metal oxide nanoparticle suspensions. The dynamic behavior of nano-titanium dioxide (TiO2) particles in buffer solutions of different chemical composition and pH values was investigated as a sample system using PCS. The resulting autocorrelation functions (AFs) at different time intervals, particle concentrations, and pH values were measured at several detection angles. The AF exhibits a multi-mode relaxation time feature and the calculated hydrodynamic diameters strongly depended on media composition and detection angle. This result indicates that the size and dispersion of nano-TiO2 agglomerates are significantly affected by solution media. A measurement protocol for determining size and dispersion of metal oxide particles in media is proposed and related to a performance test found in industry.

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Authors and Affiliations

  1. National Institute of Standards and Technology, 100 Bureau Dr Stop 8615, Gaithersburg, MD, 20899, USA

    I-Hsiang Tseng, Stephanie S. Watson & Li-Piin Sung

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  1. I-Hsiang Tseng
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  2. Stephanie S. Watson
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  3. Li-Piin Sung
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Correspondence to Stephanie S. Watson.

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Tseng, IH., Watson, S.S. & Sung, LP. Characterizing the dynamic behavior of nano-TiO2 agglomerates in suspensions by photocorrelation spectroscopy. J Nanopart Res 13, 2195–2204 (2011). https://doi.org/10.1007/s11051-010-9977-3

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  • DOI: https://doi.org/10.1007/s11051-010-9977-3

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