Colloidal polarization of yolk/shell particles by reconfiguration of inner cores responsive to an external magnetic field

Ayako Okada, Daisuke Nagao, Takuya Ueno, Haruyuki Ishii, Mikio Konno

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Yolk/shell particles, which were hollow silica particles containing a movable magnetic silica core (MSC), were prepared by removing a middle polystyrene layer from multilayered particles of MSC/polystyrene/silica shell with heat treatment followed by a slight etching with a basic solution. An ac electric field was applied to the suspension of the yolk/shell particles to form pearl chains (1D structure) of yolk/shell particles. Observation with an optical microscope showed that the MSCs in the silica compartment of the pearl chains had a zigzag structure under the electric field. An external magnetic field applied to the suspension could form a novel structure of doublet MSC in the shell compartment of the quasi-pearl chain structure. Application of a magnetic field was also performed for 2D hexagonally close-packed assemblies of the yolk/shell particles, which could two-dimensionally form a doublet structure of MSCs as if they were polarized in the compartment. Switching on/off the magnetic field successfully controlled the positional ordering of cores in the consolidated silica shell.

Original languageEnglish
Pages (from-to)9004-9009
Number of pages6
JournalLangmuir
Volume29
Issue number28
DOIs
Publication statusPublished - 2013 Jul 16

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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