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Thermosensitive hollow Janus dumbbells

Abstract

Thermosensitive hollow Janus dumbbells, consisting of two partially fused hollow poly (N-isopropylacrylamide) (PNIPAM) spheres, were prepared using dumbbell-shaped microgels as templates. One sphere has a shell completely made of PNIPAM while the other one has a hybrid shell, which is a poly(styrene-co-3-(trimethoxysilyl)propyl methacrylate) layer covered by PNIPAM. The morphology of hollow Janus dumbbells is fully characterized by cryo- and transmission electron microscopy, scanning force microscopy, and dynamic light scattering. Transmission electron microscopy demonstrates that the particles have a very narrow size distribution. The analysis by depolarized dynamic light scattering showed that the hollow Janus dumbbells exhibit a thermosensitive behavior comparable to the dumbbell-shaped microgels before the removal of the core.

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Acknowledgments

The authors acknowledge financial support by the Deutsche Forschungsgemeinschaft through the Schwerpunktprogramm “Hydrogele” (SPP1259) and the SFB 951, and the Joint Lab for Structural Research at the Integrative Research Institute for the Sciences (IRIS Adlershof).

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Correspondence to Yan Lu or Matthias Ballauff.

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Chu, F., Polzer, F., Severin, N. et al. Thermosensitive hollow Janus dumbbells. Colloid Polym Sci 292, 1785–1793 (2014). https://doi.org/10.1007/s00396-014-3287-8

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Keywords

  • Hollow microgel
  • Thermosensitive
  • Janus dumbbells