Cooperative Switching in Large-Area Assemblies of Magnetic Janus Particles

Sangyeul Hwang, Trung Dac Nguyen, Srijanani Bhaskar, Jaewon Yoon, Marvin Klaiber, Kyung Jin Lee, Sharon C. Glotzer*, Joerg Lahann

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Magnetic Janus particles (MJPs) have received considerable attention for their rich assembly behavior and their potential technological role in applications ranging from simple magnetophoretic displays to smart cloaking devices. However, further progress is hampered by the lack of predictive understanding of the cooperative self-assembly behavior of MJPs and appropriate dynamic control mechanisms. In this paper, a detailed experimental and theoretical investigation into the magnetically directed spatiotemporal self-assembly and switching of MJPs is presented. For this purpose, a novel type of MJPs with defined hemispherical compartments carrying superparamagnetic iron oxide nanoparticles as well as a novel simulation model to describe their cooperative switching behavior is established. Combination of the theoretical and experimental work culminates in a simple method to direct assemblies of MJPs, even at high particle concentrations. In addition, a magnetophoretic display with switchable MJPs is developed on the basis of the theoretical findings to demonstrate the potential usefulness of controlled large-area assemblies of magnetic Janus particles.

Original languageEnglish (US)
Article number1907865
JournalAdvanced Functional Materials
Issue number26
StatePublished - Jun 1 2020


  • Janus particles
  • bicompartmental
  • magnetic actuation
  • self-assembly
  • stimuli-responsive materials

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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