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Monodisperse hollow silica spheres: An in-depth scattering analysis

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Abstract

Herein, we fabricate hollow silica nanoparticles with exceptionally narrow size distributions that inherently possess two distinct length scales—tens of nanometers with regards to the shell thickness, and hundreds of nanometers in regards to the total diameter. We characterize these structures using dynamic and static light scattering (DLS and SLS), small angle X-ray scattering (SAXS), and transmission electron microscopy (TEM), and we demonstrate quantitative agreement among all methods. The ratio between the radius of gyration (SLS) and hydrodynamic radius (DLS) in these particles equals almost unity, corresponding to ideal capsule behavior. We are able to resolve up to 20 diffraction orders of the hollow sphere form factor in SAXS, indicating a narrow size distribution. Data from light and X-ray scattering can be combined to a master curve covering a q-range of four orders of magnitude assessing all hierarchical length scales of the form factor. The measured SLS intensity profiles noticeably change when the scattering contrast between the interior and exterior is altered, whereas the SAXS intensity profiles do not show any significant change. Tight control of the aforementioned length scales in one simple and robust colloidal building block renders these particles suitable as future calibration standards.

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Authors and Affiliations

  1. Physical Chemistry 1–Polymer Systems, University of Bayreuth, Universitätsstr. 30, 95447, Bayreuth, Germany

    Pia Ruckdeschel & Markus Retsch

  2. Physical Chemistry 1, University of Bayreuth, Universitätsstr. 30, 95447, Bayreuth, Germany

    Martin Dulle & Stephan Förster

  3. Physical Chemistry 1–Colloidal Systems, University of Bayreuth, Universitätsstr. 30, 95447, Bayreuth, Germany

    Tobias Honold & Matthias Karg

Authors
  1. Pia Ruckdeschel
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  2. Martin Dulle
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  3. Tobias Honold
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  4. Stephan Förster
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  5. Matthias Karg
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  6. Markus Retsch
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Correspondence to Markus Retsch.

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Ruckdeschel, P., Dulle, M., Honold, T. et al. Monodisperse hollow silica spheres: An in-depth scattering analysis. Nano Res. 9, 1366–1376 (2016). https://doi.org/10.1007/s12274-016-1032-y

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  • DOI: https://doi.org/10.1007/s12274-016-1032-y

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