Free-Standing Photonic Glasses Fabricated in a Centrifugal Field

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Small. 2017, 13(34), 1701392. ISSN 1613-6810. eISSN 1613-6829. Available under: doi: 10.1002/smll.201701392
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One efficient method to obtain disordered colloidal packing is to reduce the stability of colloidal particles by adding electrolytes to the colloidal dispersions. But the correct amount of additional electrolytes must be found empirically. Here, the effect of CaCl2 on polystyrene colloidal dispersions is studied, and a link between the amount of CaCl2 and the corresponding glassy colloidal structure is quantitatively built. A threshold concentration of CaCl2 is found by dynamic light scattering. When exceeding this threshold, different nanoparticle oligomers are observed in the dispersions by analytical ultracentrifugation. The second objective is to achieve free-standing samples, which is required for many optical measurements. A universal method is established, using a centrifugal field to produce robust samples by polymerizing coassembled hydrophilic monomers to form a network, which traps the glassy colloidal structures. Photon time of flight measurements shows that the CaCl2 concentration threshold should not be exceeded. Otherwise an optical shortcut may take place. Thus, the work provides a feasible universal route to prepare macroscopic free-standing photonic glasses from electrostatically stabilized nanoparticles, suitable for further optical investigation.

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ISO 690CHEN, Mengdi, Danja FISCHLI, Lukas SCHERTEL, Geoffroy J. AUBRY, Benedikt HÄUSELE, Sebastian POLARZ, Georg MARET, Helmut CÖLFEN, 2017. Free-Standing Photonic Glasses Fabricated in a Centrifugal Field. In: Small. 2017, 13(34), 1701392. ISSN 1613-6810. eISSN 1613-6829. Available under: doi: 10.1002/smll.201701392
BibTex
@article{Chen2017-09FreeS-39788,
  year={2017},
  doi={10.1002/smll.201701392},
  title={Free-Standing Photonic Glasses Fabricated in a Centrifugal Field},
  number={34},
  volume={13},
  issn={1613-6810},
  journal={Small},
  author={Chen, Mengdi and Fischli, Danja and Schertel, Lukas and Aubry, Geoffroy J. and Häusele, Benedikt and Polarz, Sebastian and Maret, Georg and Cölfen, Helmut},
  note={Article Number: 1701392}
}
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