Double-phase-functionalized magnetic janus polymer microparticles containing TiO2 and Fe2O3 nanoparticles encapsulated in mussel-inspired amphiphilic polymers

Hiroshi Yabu, Hiroyuki Ohshima, Yuta Saito

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


Recently, anisotropic colloidal polymeric materials including Janus microparticles, which have two distinct aspects on their surfaces or interiors, have garnered much interest due to their anisotropic alignment and rotational orientation with respect to external electric or magnetic fields. Janus microparticles are also good candidates for pigments in "twisting ball type" electronic paper, which is considered promising for next-generation flexible display devices. We demonstrate here a universal strategy to encapsulate inorganic nanoparticles and to introduce different such inorganic nanoparticles into distinct polymer phases in Janus microparticles. TiO2 and Fe2O3 nanoparticles were separately encapsulated in two different mussel-inspired amphiphilic copolymers, and then organic-inorganic composite Janus microparticles were prepared by simple evaporation of solvent from the dispersion containing the polymer and nanoparticle. These Janus microparticles were observed to rotate quickly in response to applied magnetic fields.

Original languageEnglish
Pages (from-to)18122-18128
Number of pages7
JournalACS Applied Materials and Interfaces
Issue number20
Publication statusPublished - 2014 Oct 22


  • Janus particles
  • amphiphilic polymers
  • inorganic nanoparticles
  • mussel-inspired
  • phase separation

ASJC Scopus subject areas

  • Materials Science(all)


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