A new look at effective interactions between microgel particles

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2018
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Bergman, Maxime J.
Gnan, Nicoletta
Obiols-Rabasa, Marc
Rovigatti, Lorenzo
Zaccarelli, Emanuela
Schurtenberger, Peter
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Nature Communications. 2018, 9, 5039. eISSN 2041-1723. Available under: doi: 10.1038/s41467-018-07332-5
Zusammenfassung

Thermoresponsive microgels find widespread use as colloidal model systems, because their temperature-dependent size allows facile tuning of their volume fraction in situ. However, an interaction potential unifying their behavior across the entire phase diagram is sorely lacking. Here we investigate microgel suspensions in the fluid regime at different volume fractions and temperatures, and in the presence of another population of small microgels, combining confocal microscopy experiments and numerical simulations. We find that effective interactions between microgels are clearly temperature dependent. In addition, microgel mixtures possess an enhanced stability compared to hard colloid mixtures - a property not predicted by a simple Hertzian model. Based on numerical calculations we propose a multi-Hertzian model, which reproduces the experimental behavior for all studied conditions. Our findings highlight that effective interactions between microgels are much more complex than usually assumed, displaying a crucial dependence on temperature and on the internal core-corona architecture of the particles.

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ISO 690BERGMAN, Maxime J., Nicoletta GNAN, Marc OBIOLS-RABASA, Janne-Mieke MEIJER, Lorenzo ROVIGATTI, Emanuela ZACCARELLI, Peter SCHURTENBERGER, 2018. A new look at effective interactions between microgel particles. In: Nature Communications. 2018, 9, 5039. eISSN 2041-1723. Available under: doi: 10.1038/s41467-018-07332-5
BibTex
@article{Bergman2018-11-28effec-45143,
  year={2018},
  doi={10.1038/s41467-018-07332-5},
  title={A new look at effective interactions between microgel particles},
  volume={9},
  journal={Nature Communications},
  author={Bergman, Maxime J. and Gnan, Nicoletta and Obiols-Rabasa, Marc and Meijer, Janne-Mieke and Rovigatti, Lorenzo and Zaccarelli, Emanuela and Schurtenberger, Peter},
  note={Article Number: 5039}
}
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