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Issue 47, 2012
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Diffusive dynamics of nanoparticles in aqueous dispersions

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Abstract

The diffusive dynamics of 100 nm to 400 nm diameter polystyrene nanoparticles dispersed in water were studied using brightfield and fluorescence based differential dynamic microscopy (DDM) and compared to those obtained from dynamic light scattering. The relaxation times measured with brightfield and fluorescence DDM over a broad range of concentration of nanoparticles (10−6φ ≤ 10−3) and scattering vectors (0.5 μm−1 < q < 10 μm−1) are in excellent agreement with each other and extrapolate quantitatively to those obtained from DLS measurements. The diffusion coefficients extracted from the q-dependent relaxation times using all three methods are independent of the nanoparticle concentration.

Graphical abstract: Diffusive dynamics of nanoparticles in aqueous dispersions

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Publication details

The article was received on 15 Jun 2012, accepted on 12 Sep 2012 and first published on 04 Oct 2012


Article type: Paper
DOI: 10.1039/C2SM26392K
Citation: Soft Matter, 2012,8, 11933-11938
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    Diffusive dynamics of nanoparticles in aqueous dispersions

    K. He, M. Spannuth, J. C. Conrad and R. Krishnamoorti, Soft Matter, 2012, 8, 11933
    DOI: 10.1039/C2SM26392K

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