Observation of liquid glass in suspensions of ellipsoidal colloids

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2021
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Proceedings of the National Academy of Sciences of the United States of America. National Academy of Sciences. 2021, 118(3), e2018072118. ISSN 0027-8424. eISSN 1091-6490. Available under: doi: 10.1073/pnas.2018072118
Zusammenfassung

Despite the omnipresence of colloidal suspensions, little is known about the influence of colloid shape on phase transformations, especially in nonequilibrium. To date, real-space imaging results at high concentrations have been limited to systems composed of spherical colloids. In most natural and technical systems, however, particles are nonspherical, and their structural dynamics are determined by translational and rotational degrees of freedom. Using confocal microscopy of fluorescently labeled core-shell particles, we reveal that suspensions of ellipsoidal colloids form an unexpected state of matter, a liquid glass in which rotations are frozen while translations remain fluid. Image analysis unveils hitherto unknown nematic precursors as characteristic structural elements of this state. The mutual obstruction of these ramified clusters prevents liquid crystalline order. Our results give insight into the interplay between local structures and phase transformations. This helps to guide applications such as self-assembly of colloidal superstructures and also gives evidence of the importance of shape on the glass transition in general.

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530 Physik
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colloidal dispersion, glass transition, ellipsoidal core–shell colloids, confocal microscopy, mode coupling theory
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ISO 690ROLLER, Jörg, Aleena LAGANAPAN, Janne-Mieke MEIJER, Matthias FUCHS, Andreas ZUMBUSCH, 2021. Observation of liquid glass in suspensions of ellipsoidal colloids. In: Proceedings of the National Academy of Sciences of the United States of America. National Academy of Sciences. 2021, 118(3), e2018072118. ISSN 0027-8424. eISSN 1091-6490. Available under: doi: 10.1073/pnas.2018072118
BibTex
@article{Roller2021-01-19Obser-52383,
  year={2021},
  doi={10.1073/pnas.2018072118},
  title={Observation of liquid glass in suspensions of ellipsoidal colloids},
  number={3},
  volume={118},
  issn={0027-8424},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  author={Roller, Jörg and Laganapan, Aleena and Meijer, Janne-Mieke and Fuchs, Matthias and Zumbusch, Andreas},
  note={Article Number: e2018072118}
}
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