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    Diffusive Dynamics of Nanoparticles in Arrays of Nanoposts

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    Type
    Article
    Authors
    He, Kai
    Babaye Khorasani, Firoozeh
    Retterer, Scott T.
    Thomas, Darrell K.
    Conrad, Jacinta C.
    Krishnamoorti, Ramanan
    KAUST Grant Number
    KUS-C1-018-02
    Date
    2013-05-20
    Online Publication Date
    2013-05-20
    Print Publication Date
    2013-06-25
    Permanent link to this record
    http://hdl.handle.net/10754/597977
    
    Metadata
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    Abstract
    The diffusive dynamics of dilute dispersions of nanoparticles of diameter 200-400 nm were studied in microfabricated arrays of nanoposts using differential dynamic microscopy and single particle tracking. Posts of diameter 500 nm and height 10 μm were spaced by 1.2-10 μm on a square lattice. As the spacing between posts was decreased, the dynamics of the nanoparticles slowed. Moreover, the dynamics at all length scales were best represented by a stretched exponential rather than a simple exponential. Both the relative diffusivity and the stretching exponent decreased linearly with increased confinement and, equivalently, with decreased void volume. The slowing of the overall diffusive dynamics and the broadening distribution of nanoparticle displacements with increased confinement are consistent with the onset of dynamic heterogeneity and the approach to vitrification. © 2013 American Chemical Society.
    Citation
    He K, Babaye Khorasani F, Retterer ST, Thomas DK, Conrad JC, et al. (2013) Diffusive Dynamics of Nanoparticles in Arrays of Nanoposts. ACS Nano 7: 5122–5130. Available: http://dx.doi.org/10.1021/nn4007303.
    Sponsors
    This publication is based on work supported in part by Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST). R.K. and K.H. acknowledge the partial support of the Gulf of Mexico Research Initiative (Consortium for Ocean Leadership Grant SA 12-05/GoMRI-002). J.C.C. is supported by the American Chemical Society Petroleum Research Fund (52537-DNI7) and the National Science Foundation (DMR-1151133). A portion of this research was conducted at the Center for Nanophase Materials Sciences, which is sponsored at Oak Ridge National Laboratory by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy.
    Publisher
    American Chemical Society (ACS)
    Journal
    ACS Nano
    DOI
    10.1021/nn4007303
    PubMed ID
    23672180
    ae974a485f413a2113503eed53cd6c53
    10.1021/nn4007303
    Scopus Count
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