Temperature-Directed Formation of Anisotropic Kettlebell and Tadpole Nanostructures in the Absence of a Swelling-Induced Solvent

Sung Po R. Chen, Valentin A. Bobrin, Zhongfan Jia, Michael J. Monteiro

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Anisotropic Janus (“snowman”) nanoparticles with a single protrusion are currently made via the solvent swelling-induced method. Here, we demonstrate without the aid of toxic solvents a generally applicable method for the formation of anisotropic polymer nanoparticles directly in water by controlling polymer mobility through tuning its glass transition temperature (Tg). Spherical structures, formed immediately after the emulsion polymerization, transformed into uniform tadpoles (with head diameter ≈60 nm and tail length ≈130 nm) through the protrusion of a single cylindrical tail when cooled to a temperature above the Tg of the polymer. Cooling the spheres to below the Tg produced kinetically trapped kettlebell structures that could be freeze-dried and rehydrated without any structural change. These unique kettlebells could transform into uniform tadpoles by heating above the Tg, representing a triggered and on-demand structural reorganization.

Original languageEnglish
Article numbere202113974
Number of pages5
JournalAngewandte Chemie - International Edition
Volume61
Issue number11
Early online date18 Jan 2022
DOIs
Publication statusPublished - 7 Mar 2022
Externally publishedYes

Keywords

  • Anisotropic Nanoparticles
  • Asymmetric Structures
  • Emulsion Polymerization
  • RAFT polymerization
  • TDMT
  • RAFT Polymerization

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