Electrically Controlled Two-Dimensional Cluster Formation of Polystyrene Particles and Cluster Fixation with Adsorbed Polyelectrolyte

Hiroyuki Yamazaki, Masanori Orita, Toshio Sakai, Takahiro Ohkubo, Hideki Sakai, Takashi Yamashita, Tohru Kohno, Masahiko Abe

Research output: Contribution to journalArticlepeer-review


An attempt was made to orderly arrange a large number of polystyrene particles dispersed in aqueous medium on the electrode surface and fix the formed particle arrangement. The measuring cell used consisted of two transparent indium tin electrodes 500 μm apart from each other in the vertical direction. The gap between the electrodes was filled with a dispersion of polystyrene particles (5 μm size) and the behavior of the particles in electric fields applied between the electrodes was on-site observed with an optical microscope. Simultaneous application of DC and AC fields caused polystyrene particles to form single-layered clusters each consisting of several tens particles on the lower electrode. Densely arranged clusters were formed for the particles with polyallylamine hydrochloride (PAH), a cationic polyelectrolyte, adsorbed on their surface upon application of DC and AC fields and the clusters formed remained unbroken after removal of the fields. No cluster formation was observed, however, for the particles after adsorbing the cationic polyelectrolyte and then poly (sodium styrenesulfonate) (PSS), an anionic polyelectrolyte. These findings suggested that particle arrangement and its fixation of polystyrene particles are appreciably affected by polyelectrolyte adsorption.

Original languageEnglish
Pages (from-to)437-444
Number of pages8
JournalJournal of Oleo Science
Issue number9
Publication statusPublished - 2004
Externally publishedYes


  • cluster fixation
  • colloid crystal
  • electroosmotic flow
  • monoparticle-layered cluster
  • polyelectrolyte

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)


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